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Loans (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Subtotal $ 228,481us-gaap_LoansAndLeasesReceivableGrossCarryingAmount   $ 225,354us-gaap_LoansAndLeasesReceivableGrossCarryingAmount      
Less: Net deferred loan fees (407)us-gaap_LoansAndLeasesReceivableDeferredIncome   (388)us-gaap_LoansAndLeasesReceivableDeferredIncome      
Allowance for loan losses (2,452)us-gaap_LoansAndLeasesReceivableAllowance (2,419)us-gaap_LoansAndLeasesReceivableAllowance (2,405)us-gaap_LoansAndLeasesReceivableAllowance (2,487)us-gaap_LoansAndLeasesReceivableAllowance (2,486)us-gaap_LoansAndLeasesReceivableAllowance (2,496)us-gaap_LoansAndLeasesReceivableAllowance
Net Loans 225,622us-gaap_LoansAndLeasesReceivableNetReportedAmount   222,561us-gaap_LoansAndLeasesReceivableNetReportedAmount      
Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Subtotal 32,079us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
  33,809us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
     
Allowance for loan losses (311)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
(300)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
(307)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
(159)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
(150)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 6,868us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
  3,688us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
     
Allowance for loan losses (1,493)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
(1,455)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
(1,440)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
(1,501)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
(1,499)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 135,176us-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 29,779us-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 15,541us-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 814us-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 8,224us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
  8,604us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
     
Allowance for loan losses $ (360)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ (375)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ (364)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ (376)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ (337)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ (250)us-gaap_LoansAndLeasesReceivableAllowance
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember