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Mortgage Banking Activities (Mortgage Banking Income) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Transfers and Servicing [Abstract]      
Origination and processing fees $ (748)cacb_FeesandCommissionsMortgageBankingandServicingOriginationandProcessingFees $ (651)cacb_FeesandCommissionsMortgageBankingandServicingOriginationandProcessingFees $ (594)cacb_FeesandCommissionsMortgageBankingandServicingOriginationandProcessingFees
Gain on sales of mortgage loans, net 1,539us-gaap_GainLossOnSaleOfMortgageLoans 3,337us-gaap_GainLossOnSaleOfMortgageLoans 3,845us-gaap_GainLossOnSaleOfMortgageLoans
MSR valuation allowance 0us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries 157us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries (157)us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries
Servicing fees 678us-gaap_ContractuallySpecifiedServicingFeesAmount 515us-gaap_ContractuallySpecifiedServicingFeesAmount 171us-gaap_ContractuallySpecifiedServicingFeesAmount
Amortization (669)us-gaap_AmortizationOfMortgageServicingRightsMSRs (399)us-gaap_AmortizationOfMortgageServicingRightsMSRs (134)us-gaap_AmortizationOfMortgageServicingRightsMSRs
Mortgage banking income, net $ 2,296us-gaap_FeesAndCommissionsMortgageBankingAndServicing $ 4,261us-gaap_FeesAndCommissionsMortgageBankingAndServicing $ 4,319us-gaap_FeesAndCommissionsMortgageBankingAndServicing