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Fair Value (Details Textual) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Mar. 31, 2014
Mar. 31, 2014
Mar. 31, 2015
Jun. 30, 2014
Financing Receivable, Impaired [Line Items]        
Principal balance     $ 4,007us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance $ 3,208us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Provision For Loan And Lease Losses Increase 128cbkm_ProvisionForLoanAndLeaseLossesIncrease 128cbkm_ProvisionForLoanAndLeaseLossesIncrease    
Provision For Loan And Lease Losses Decrease 52cbkm_ProvisionForLoanAndLeaseLossesDecrease 115cbkm_ProvisionForLoanAndLeaseLossesDecrease    
Securities Pledged as Collateral [Member]        
Financing Receivable, Impaired [Line Items]        
Principal balance     $ 30us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SecuritiesPledgedAsCollateralMember		 $ 101us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SecuritiesPledgedAsCollateralMember