12 Months Ended
Jun. 30, 2012
Organization, Consolidation and Presentation Of Financial Statements [Abstract]  
Consolidation, Policy [Policy Text Block]
Principles of Consolidation: The consolidated financial statements include the accounts of Consumers Bancorp, Inc. (Corporation) and its wholly owned subsidiary, Consumers National Bank (Bank), together referred to as the Corporation. All significant intercompany transactions have been eliminated in the consolidation.
Basis Of Accounting Policy [Policy Text Block]
Nature of Operations: Consumers Bancorp, Inc. is a bank holding company headquartered in Minerva, Ohio that provides, through its banking subsidiary, a broad array of products and services throughout its primary market area of Stark, Columbiana, Carroll and contiguous counties in Ohio. The Bank’s business involves attracting deposits from businesses and individual customers and using such deposits to originate commercial, mortgage and consumer loans in its primary market area.
Segment Reporting, Policy [Policy Text Block]
Business Segment Information: Consumers Bancorp, Inc. is a bank holding company engaged in the business of commercial and retail banking, which accounts for substantially all of its revenues, operating income, and assets. Accordingly, all of its operations are reported in one segment, banking.
Use of Estimates, Policy [Policy Text Block]
Use of Estimates: To prepare financial statements in conformity with U. S. generally accepted accounting principles, management makes estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and the disclosures provided, and actual results could differ. The allowance for loan losses, fair values of financial instruments, and determination of other-than-temporary impairment of securities are particularly subject to change.
Cash and Cash Equivalents, Policy [Policy Text Block]
Cash Flows: Cash and cash equivalents include cash, deposits with other financial institutions with original maturities of less than 90 days and federal funds sold.  Net cash flows are reported for customer loan and deposit transactions, interest bearing deposits in other financial institutions and short-term borrowings.
Interest - Bearing Deposits In Other Financial Institutions [Policy Text Block]
Interest–Bearing Deposits in Other Financial Institutions: Interest-bearing deposits in other financial institutions mature within one year and are carried at cost.
Cash Reserves [Policy Text Block]
Cash Reserves: The Bank is required to maintain cash on hand and non-interest bearing balances on deposit with the Federal Reserve Bank to meet regulatory reserve and clearing requirements. The required reserve balance at June 30, 2012 and 2011 was $3,991 and $3,075, respectively.
Marketable Securities, Policy [Policy Text Block]

Securities: Securities are generally classified into either held-to-maturity or available-for-sale categories. Held-to-maturity securities are carried at amortized cost and are those that the Corporation has the positive intent and ability to hold to maturity. Available-for-sale securities are those that the Corporation may decide to sell before maturity if needed for liquidity, asset-liability management, or other reasons. Available-for-sale securities are reported at fair value, with unrealized gains or losses included in other comprehensive income as a separate component of equity, net of tax.


Interest income includes amortization of purchase premiums and accretion of discounts. Premiums and discounts on securities are amortized on the level-yield method without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. Gains and losses on sales are recorded on the trade date and determined using the specific identification method.


Management evaluates securities for other-than-temporary impairment (OTTI) at least on a quarterly basis and more frequently when economic or market conditions warrant such an evaluation. For securities in an unrealized loss position, management considers the extent and duration of the unrealized loss, and the financial condition and near-term prospects of the issuer. Management also assesses whether it intends to sell, or it is more likely than not that it will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. If either of the criteria regarding intent or requirement to sell is met, the entire difference between amortized cost and fair value is recognized as impairment through earnings. For debt securities that do not meet the aforementioned criteria, the amount of impairment is split into two components as follows: 1) OTTI related to credit loss, which must be recognized in the income statement and 2) OTTI related to other factors, which is recognized in other comprehensive income. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized cost basis. For equity securities, the entire amount of impairment is recognized through earnings.

Federal Home Loan Bank (Fhlb) Stock [Policy Text Block]
Federal Bank and Other Restricted Stocks: The Bank is a member of the Federal Home Loan Bank (FHLB) system. Members are required to own a certain amount of stock based on the level of borrowings and other factors, and may invest in additional amounts. FHLB stock, included with Federal bank and other restricted stocks on the Consolidated Balance Sheet, is carried at cost, classified as a restricted security and periodically evaluated for impairment based on ultimate recovery of par value. Federal Reserve Bank stock is also carried at cost. Since these stocks are viewed as a long-term investment, impairment is based on ultimate recovery of par value. Both cash and stock dividends are reported as income.
Finance, Loan and Lease Receivables, Held-for-sale, Policy [Policy Text Block]
Loans Held for Sale: Mortgage loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or fair value, as determined by outstanding commitments from investors. Mortgage loans held for sale are generally sold with servicing rights released. Net unrealized losses, if any, are recorded as a valuation allowance and charged to earnings. Gains and losses on sales of mortgage loans are based on the difference between the selling price and the carrying value of the related loan sold.
Policy Loans Receivable, Policy [Policy Text Block]

Loans: Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at the principal balance outstanding, net of deferred loan fees and costs, and an allowance for loan losses. Interest income is accrued on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, are deferred and recognized in interest income using the level-yield method without anticipating prepayments. The recorded investment in loans includes accrued interest receivable.


Interest income on mortgage and commercial loans is discontinued at the time the loan is 90 days delinquent unless the loan is well-secured and in the process of collection. Consumer loans are typically charged off no later than 120 days past due. Past due status is determined by the contractual terms of the loan. In all cases, loans are placed on non-accrual or charged-off at an earlier date if collection of principal or interest is considered doubtful.


All interest accrued but not received on loans placed on non-accrual is reversed against interest income. Interest received on such loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual. Loans are returned to accrual status when the customer has exhibited the ability to repay and demonstrated this ability over a consecutive six month period and future payments are reasonably assured.

Loan Commitments, Policy [Policy Text Block]
Loan Commitments and Related Financial Instruments: Financial instruments include off-balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when funded.
Concentration Risk, Credit Risk
Concentrations of Credit Risk: The Bank grants consumer, real estate and commercial loans primarily to borrowers in Stark, Columbiana and Carroll counties. Therefore, the Corporation’s exposure to credit risk is significantly affected by changes in the economy in this tri-county area. Automobiles and other consumer assets, business assets and residential and commercial real estate secure most loans.
Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block]

Allowance for Loan Losses: The allowance for loan losses is a valuation allowance for probable incurred credit losses. Loan losses are charged against the allowance when management believes the uncollectability of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. Management estimates the allowance balance required based on past loan loss experience, the nature and volume of the portfolio, information about specific borrower situations and estimated collateral values, economic conditions and other factors. Allocations of the allowance may be made for specific loans, but the entire allowance is available for any loan that, in management’s judgment, should be charged-off.


The allowance consists of specific and general components. The specific component relates to loans that are individually classified as impaired. The general component covers non-classified loans and is based on historical loss experience adjusted for current factors.


A loan is considered impaired when, based on current information and events, it is probable that the Corporation will be unable to collect all amounts due according to the contractual terms of the loan agreement. Loans, for which the terms have been modified resulting in a concession, and for which the borrower is experiencing financial difficulties, are considered trouble debt restructurings and classified as impaired. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed.


Impairment is evaluated in total for smaller-balance loans of similar nature such as residential mortgage, consumer loans and on an individual loan basis for other loans. If a loan is impaired, a portion of the allowance is allocated so the loan is reported, net, at the present value of estimated future cash flows using the loan’s existing rate or at the fair value of collateral if repayment is expected from the collateral. Loans are evaluated for impairment when payments are delayed, typically 90 days or more, or when it is probable that not all principal and interest amounts will be collected according to the original terms of the loan. Troubled debt restructurings are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective interest rate at inception. If a troubled debt restructuring is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. For troubled debt restructurings that subsequently default, the Corporation determines the amount of reserve in accordance with the accounting policy for the allowance for loan losses.


The general component covers non-impaired loans and is based on historical loss experience adjusted for current factors. The historical loss experience is determined by portfolio segment and is based on the actual loss history experienced by the Corporation over the most recent three year period. This actual loss experience is supplemented with other economic factors based on the risks present for each portfolio segment. These economic factors include consideration of the following: levels of and trends in volume and terms of loans; effects of any changes in risk selection and underwriting standards; other changes in lending policies, procedures and practices; experience, ability and depth of lending management and other relevant staff; national and local economic trends and conditions; industry conditions; and effects of changes in credit concentrations. The following portfolio segments have been identified:


Commercial Loans: Commercial loans are made for a wide variety of general business purposes, including financing for equipment, inventories and accounts receivable. The term of each commercial loan varies by its purpose. Commercial loans are underwritten after evaluating and understanding the borrower’s ability to operate profitably and prudently expand its business. Current and projected cash flows are evaluated to determine the ability of the borrower to repay their obligations as agreed. Commercial loans are primarily made based on the identified cash flows of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not be as expected and the collateral securing these loans may fluctuate in value. Most commercial loans are secured by the assets being financed or other business assets such as accounts receivable or inventory and usually incorporate a personal guarantee; however, some short-term loans may be made on an unsecured basis. In the case of loans secured by accounts receivable, the availability of funds for the repayment of these loans may be substantially dependent on the ability of the borrower to collect amounts due from its customers. The commercial loan portfolio includes loans to a wide variety of corporations and businesses across many industrial classifications in the areas where the Bank operates.


Commercial Real Estate: Commercial real estate loans include mortgage loans to farmers, multi-family investment properties, developers and owners of commercial real estate. Commercial real estate lending typically involves higher loan principal amounts and the repayment of these loans is generally largely dependent on the successful operation of the property securing the loan or the business conducted on the property securing the loan. Commercial real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. The properties securing the Corporation’s commercial real estate portfolio are diverse in terms of type and geographic location. This diversity helps reduce the Corporation’s exposure to adverse economic events that affect any single market or industry. Management monitors and evaluates commercial real estate loans based on collateral, geography and risk grade criteria. In addition, management tracks the level of owner-occupied commercial real estate loans versus non-owner occupied loans.


Residential real estate: Residential real estate loans are secured by one to four family residential properties and include both owner occupied, non-owner occupied and home equity loans. Credit approval for residential real estate loans requires demonstration of sufficient income to repay the principal and interest and the real estate taxes and insurance, stability of employment, an established credit record and an appropriately appraised value of the real estate securing the loan that generally requires that the residential real estate loan amount be no more than 80% of the purchase price or the appraised value of the real estate securing the loan. Underwriting standards for home equity loans are heavily influenced by statutory requirements, which include, but are not limited to, a maximum loan-to-value percentage of 80%, collection remedies, the number of such loans a borrower can have at one time and documentation requirements.


Consumer Loans: The Corporation originates direct and indirect consumer loans, primarily automobile loans, personal lines of credit, and unsecured consumer loans in its primary market areas. Credit approval for consumer loans requires income sufficient to repay principal and interest due, stability of employment, an established credit record and sufficient collateral for secured loans. Consumer loans typically have shorter terms and lower balances with higher yields as compared to real estate mortgage loans, but generally carry higher risks of default. Consumer loan collections are dependent on the borrower’s continuing financial stability, and thus are more likely to be affected by adverse personal circumstances.

Finance, Loan and Lease Receivables, Held for Investments, Foreclosed Assets Policy [Policy Text Block]
Other Real Estate Owned: Real estate properties acquired through, or in lieu of, loan foreclosure are initially recorded at fair value less costs to sell at the date of acquisition, establishing a new cost basis. Any reduction to fair value from the carrying value of the related loan at the time of acquisition is accounted for as a loan loss. These assets are subsequently accounted for at lower of cost or fair value less estimated costs to sell. If the fair value declines after acquisition, a valuation allowance is recorded as a charge to income. Operating costs after acquisition are expensed. Gains and losses on disposition are reported as a charge to income.
Property, Plant and Equipment, Policy [Policy Text Block]
Premises and Equipment: Land is carried at cost. Premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed primarily using the straight-line method over the estimated useful life of the owned asset and, for leasehold improvements, generally over the lesser of the remaining term of the lease facility or the estimated economic life of the improvement. Useful lives range from three years for software to thirty-nine and one-half years for buildings.
Cash Surrender Value Of Life Insurance [Policy Text Block]
Cash Surrender Value of Life Insurance: The Bank has purchased single-premium life insurance policies to insure the lives of current and former participants in the salary continuation plan. As of June 30, 2012, the Bank had policies with total death benefits of $12,044 and total cash surrender values of $5,605. As of June 30, 2011, the Bank had policies with total death benefits of $11,944 and total cash surrender values of $5,411. Bank owned life insurance is recorded at the amount that can be realized under the insurance contract at the balance sheet date, which is the cash surrender value adjusted for other changes or other amounts due that are probable at settlement. Tax-exempt income is recognized from the periodic increases in cash surrender value of these policies.
Intangible Assets, Finite-Lived, Policy [Policy Text Block]
Intangible Assets: Core deposit intangible is recorded at cost and is amortized over an estimated life of 12 years on a straight line method. Intangibles are assessed annually for impairment and written down as necessary. 
Long-Term Assets [Policy Text Block]
Long-term Assets: Premises and equipment, core deposit and other intangible assets and other long-term assets are reviewed for impairment when events indicate their carrying amount may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value.
Repurchase and Resale Agreements Policy [Policy Text Block]
Repurchase Agreements: Substantially all repurchase agreement liabilities, which are classified as short-term borrowings, represent amounts advanced by various customers. Securities are pledged to cover these liabilities, which are not covered by federal deposit insurance.
Pension and Other Postretirement Plans, Policy [Policy Text Block]
Retirement Plan: The Bank maintains a 401(k) savings and retirement plan covering all eligible employees. Matching contributions are made and expensed annually.
Income Tax, Policy [Policy Text Block]
Income Taxes: The Corporation files a consolidated federal income tax return. Income tax expense is the sum of the current-year income tax due or refundable and the change in deferred tax assets and liabilities. Deferred tax assets and liabilities are the expected future tax consequences of temporary differences between the carrying amounts and tax basis of assets and liabilities, computed using enacted tax rates. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. The Corporation applies a more likely than not recognition threshold for all tax uncertainties in accordance with U.S. generally accepted accounting principles. A tax position is recognized as a benefit only if it is more likely than not the position would be sustained in a tax examination, with a tax examination being presumed to occur. The amount recognized is the largest amount of tax benefit greater than 50% likely of being realized on examination. The Corporation recognizes interest and/or penalties related to income tax matters in income tax expense.
Earnings Per Share, Policy [Policy Text Block]

Earnings per Common Share: Basic earnings per common share is net income divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share includes the dilutive effect of additional potential common shares issuable upon the vesting of restricted stock awards.

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]
Stock-Based Compensation: Compensation cost is recognized for restricted stock awards issued to employees over the required service period, generally defined as the vesting period. The fair value of restricted stock awards is estimated by using the market price of the Corporation’s common stock at the date of grant. For awards with graded vesting, compensation cost is recognized on a straight-line basis over the requisite service period for the entire award.
Comprehensive Income Policy [Policy Text Block]
Comprehensive Income: Comprehensive income consists of net income and other comprehensive income. Other comprehensive income includes unrealized gains and losses on securities available-for-sale, which are also recognized as a separate component of equity, net of tax.
Malpractice Loss Contingency, Policy [Policy Text Block]
Loss Contingencies: Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Management does not believe there are such matters that will have a material effect on the financial statements.
Fair Value of Financial Instruments, Policy [Policy Text Block]
Fair Value of Financial Instruments: Fair values of financial instruments are estimated using relevant market information and other assumptions, as more fully disclosed in a separate note. Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, discounted cash flows, prepayments, and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect the estimates.
Dividend Restrictions [Policy Text Block]
           Dividend Restrictions: Banking regulations require maintaining certain capital levels and may limit the dividends paid by the Bank to the holding company or by the holding company to shareholders. As of June 30, 2012 the Bank could, without prior approval, declare a dividend of approximately $4,107.
New Accounting Pronouncements Policy [Policy Text Block]
Reclassifications: Certain reclassifications have been made to the June 30, 2011 financial statements to be comparable to the June 30, 2012 presentation.
Prior Period Reclassification Adjustment, Description

Adoption of New Accounting Standards: In May, 2011, the Financial Accounting Standards Board (FASB) issued an amendment to achieve common fair value measurement and disclosure requirements between U.S. and International accounting principles. Overall, the guidance is consistent with existing U.S. accounting principles; however, there are some amendments that change a particular principle or requirement for measuring fair value or for disclosing information about fair value measurements. The amendments in this guidance are effective for interim and annual reporting periods beginning after December 15, 2011. The effect of adopting this standard did not have a material effect on the Corporation’s operating results or financial condition, but the additional disclosures are included in Note 13.


In June 2011, the FASB amended existing guidance and eliminated the option to present the components of other comprehensive income as part of the statement of changes in shareholders’ equity. The amendment requires that comprehensive income be presented in either a single continuous statement or in two separate consecutive statements. The amendments in this guidance are effective as of the beginning of a fiscal reporting year, and interim periods within that year, that begins after December 15, 2011. Early adoption is permitted. The adoption of this amendment had no impact on the consolidated financial statements as the prior presentation of comprehensive income was in compliance with this amendment.