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Loans (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Subtotal $ 231,619us-gaap_LoansAndLeasesReceivableGrossCarryingAmount   $ 225,354us-gaap_LoansAndLeasesReceivableGrossCarryingAmount      
Less: Net deferred loan fees (412)us-gaap_LoansAndLeasesReceivableDeferredIncome   (388)us-gaap_LoansAndLeasesReceivableDeferredIncome      
Allowance for loan losses (2,425)us-gaap_LoansAndLeasesReceivableAllowance (2,452)us-gaap_LoansAndLeasesReceivableAllowance (2,405)us-gaap_LoansAndLeasesReceivableAllowance (2,337)us-gaap_LoansAndLeasesReceivableAllowance (2,487)us-gaap_LoansAndLeasesReceivableAllowance (2,496)us-gaap_LoansAndLeasesReceivableAllowance
Net Loans 228,782us-gaap_LoansAndLeasesReceivableNetReportedAmount   222,561us-gaap_LoansAndLeasesReceivableNetReportedAmount      
Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Subtotal 33,576us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
  33,809us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
     
Allowance for loan losses (361)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
(311)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
(307)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
(259)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
(159)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
(161)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Subtotal 7,500us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
  3,688us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
     
Allowance for loan losses (1,491)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
(1,493)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
(1,440)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
(1,430)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
(1,501)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
(1,471)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Other Commercial Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Subtotal 137,837us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
  131,518us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
     
Residential Real Estate Owner Occupied [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Subtotal 29,188us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateOwnerOccupiedMember
  31,044us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateOwnerOccupiedMember
     
Residential Real Estate Non Owner Occupied [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Subtotal 14,870us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateNonOwnerOccupiedMember
  16,505us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateNonOwnerOccupiedMember
     
Residential Real Estate Construction [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Subtotal 1,217us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateConstructionMember
  186us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateConstructionMember
     
Consumer Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Subtotal 7,431us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
  8,604us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
     
Allowance for loan losses $ (287)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ (360)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ (364)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ (369)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ (376)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ (250)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember