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Fair Value (Details 2) (Other Commercial Real Estate [Member], Fair Value, Inputs, Level 3 [Member], USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Mar. 31, 2015
Jun. 30, 2014
Sales Comparison Approach [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value $ 26us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
/ us-gaap_ValuationTechniqueAxis
= cbkm_SalesComparisonApproachMember
$ 101us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
/ us-gaap_ValuationTechniqueAxis
= cbkm_SalesComparisonApproachMember
Valuation Technique Sales comparison approach Sales comparison approach
Unobservable Inputs Adjustment for differences between comparable sales Adjustment for differences between comparable sales
Weighted Average 37.50%us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
/ us-gaap_ValuationTechniqueAxis
= cbkm_SalesComparisonApproachMember
22.52%us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
/ us-gaap_ValuationTechniqueAxis
= cbkm_SalesComparisonApproachMember
Settlement Contract [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value $ 4us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
/ us-gaap_ValuationTechniqueAxis
= cbkm_SettlementContractMember
 
Valuation Technique Settlement Contract  
Unobservable Inputs Adjustment for difference between loan balance and settlement value  
Range 91.80%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
/ us-gaap_ValuationTechniqueAxis
= cbkm_SettlementContractMember
 
Weighted Average 91.80%us-gaap_FairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
/ us-gaap_ValuationTechniqueAxis
= cbkm_SettlementContractMember
 
Minimum [Member] | Sales Comparison Approach [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Range 35.50%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= cbkm_SalesComparisonApproachMember
14.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= cbkm_SalesComparisonApproachMember
Maximum [Member] | Sales Comparison Approach [Member]
   
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Range 71.60%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= cbkm_SalesComparisonApproachMember
31.90%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= cbkm_OtherCommercialRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= cbkm_SalesComparisonApproachMember