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Loans (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded investment, Loans non-accrual $ 1,100us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 1,959us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Recorded investment, Loans Past Due Over 90 Days Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Commercial Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded investment, Loans non-accrual 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Recorded investment, Loans Past Due Over 90 Days Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialLoanMember
Other Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded investment, Loans non-accrual 811us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
1,683us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
Recorded investment, Loans Past Due Over 90 Days Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
Residential Real Estate Owner Occupied [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded investment, Loans non-accrual 289us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateOwnerOccupiedMember
276us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateOwnerOccupiedMember
Recorded investment, Loans Past Due Over 90 Days Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateOwnerOccupiedMember
0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateOwnerOccupiedMember
Residential Real Estate Non Owner Occupied [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded investment, Loans non-accrual 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateNonOwnerOccupiedMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateNonOwnerOccupiedMember
Recorded investment, Loans Past Due Over 90 Days Still Accruing 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateNonOwnerOccupiedMember
0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancialInstrumentAxis
= cbkm_ResidentialRealEstateNonOwnerOccupiedMember
Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded investment, Loans non-accrual 0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
0us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
Recorded investment, Loans Past Due Over 90 Days Still Accruing $ 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember
$ 0us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ConsumerLoanMember