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Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Due in one year or less, Amortized cost $ 2,639us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Available for sale securities, Due after one year through five years, Amortized cost 11,753us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost  
Available for sale securities, Due after five years through ten years, Amortized cost 32,085us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Available for sale securities, Due after ten years, Amortized cost 15,589us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Available for sale securities, Amortized Cost Total 62,066us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Available for sale securities, Amortized Cost 125,428us-gaap_AvailableForSaleSecuritiesAmortizedCost 124,449us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for sale securities, Due in one year or less, Fair Value 2,649us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Available for sale securities, Due after one year through five years, Fair Value 11,988us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue  
Available for sale securities, Due after five years through ten years, Fair Value 32,873us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Available for sale securities, Due after ten years, Fair Value 15,971us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Available for sale securities, Fair Value Total 63,481cbkm_AvailableForSaleSecuritiesDebtMaturitiesFairValueTotal  
Available for sale securities, Fair Value 128,220us-gaap_AvailableForSaleSecuritiesDebtSecurities 126,393us-gaap_AvailableForSaleSecuritiesDebtSecurities
Held-to-maturity Securities, Debt Maturities, after Five years Through Ten Years,Amortized cost 780us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsNetCarryingAmount  
Held-to-maturity, Due after ten years, Amortized Cost 2,910us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsNetCarryingAmount  
Held-to-maturity Securities, Debt Maturities, after five Years Through Ten years,Estimated Fair Value 785us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Held-to-maturity, Due after ten years, Fair Value 2,940us-gaap_HeldToMaturitySecuritiesDebtMaturitiesAfterTenYearsFairValue  
Held-to-maturity, Amortized Cost 3,690us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment  
Held-to-maturity, Fair Value 3,725us-gaap_HeldToMaturitySecuritiesFairValue 3,040us-gaap_HeldToMaturitySecuritiesFairValue
Commercial Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost 1,485us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Available for sale securities, Fair Value 1,485us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CommercialMortgageBackedSecuritiesMember
 
Residential Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost 57,568us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
57,370us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Available for sale securities, Fair Value 58,585us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
58,104us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ResidentialMortgageBackedSecuritiesMember
Collateralized Mortgage Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost 4,119us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
3,887us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Available for sale securities, Fair Value 4,140us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
3,929us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Trust Preferred Securities Subject To Mandatory Redemption [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available for sale securities, Amortized Cost 190us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
202us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
Available for sale securities, Fair Value $ 529us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
$ 412us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember