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Loans Receivable and Allowance for Loan Losses (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Acquired    
Loans receivable and allowance for loan losses    
Outstanding principal balance $ 138,021us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ cfnl_LoanPortfolioSegregationAxis
= cfnl_LoanPortfolioAcquiredMember		 $ 157,595us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ cfnl_LoanPortfolioSegregationAxis
= cfnl_LoanPortfolioAcquiredMember
Carrying amount 133,436us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ cfnl_LoanPortfolioSegregationAxis
= cfnl_LoanPortfolioAcquiredMember		 152,541us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ cfnl_LoanPortfolioSegregationAxis
= cfnl_LoanPortfolioAcquiredMember
Credit impaired acquired loans    
Loans receivable and allowance for loan losses    
Outstanding principal balance 15,750us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ cfnl_LoanPortfolioSegregationAxis
= cfnl_CreditImpairedAcquiredLoansMember		 19,176us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ cfnl_LoanPortfolioSegregationAxis
= cfnl_CreditImpairedAcquiredLoansMember
Carrying amount 12,080us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ cfnl_LoanPortfolioSegregationAxis
= cfnl_CreditImpairedAcquiredLoansMember		 14,960us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ cfnl_LoanPortfolioSegregationAxis
= cfnl_CreditImpairedAcquiredLoansMember
Other acquired loans    
Loans receivable and allowance for loan losses    
Outstanding principal balance 122,271us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ cfnl_LoanPortfolioSegregationAxis
= cfnl_OtherAcquiredLoansMember		 138,419us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesOutstandingBalance
/ cfnl_LoanPortfolioSegregationAxis
= cfnl_OtherAcquiredLoansMember
Carrying amount $ 121,356us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ cfnl_LoanPortfolioSegregationAxis
= cfnl_OtherAcquiredLoansMember		 $ 137,581us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesCarryingAmountNet
/ cfnl_LoanPortfolioSegregationAxis
= cfnl_OtherAcquiredLoansMember