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Off-Balance Sheets Activities and Derivatives (Details 2) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Forward loan sale commitments    
Fair values of derivative instruments in the balance sheet    
Commitments to sell loans $ 24,900,000cway_ForwardCommitmentNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember		 $ 21,500,000cway_ForwardCommitmentNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
Not Designated As Hedging Instruments    
Fair values of derivative instruments in the balance sheet    
Assets, Fair Value 158,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 98,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Liabilities, Fair Value 36,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 96,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not Designated As Hedging Instruments | Derivative loan commitments | Other assets    
Fair values of derivative instruments in the balance sheet    
Assets, Fair Value 158,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= cway_DerivativeLoanCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 98,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= cway_DerivativeLoanCommitmentsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Not Designated As Hedging Instruments | Forward loan sale commitments | Other liabilities    
Fair values of derivative instruments in the balance sheet    
Liabilities, Fair Value $ 36,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ 96,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember