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Loans Receivable and Allowance for Loan Losses (Details 6) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
item
Mar. 31, 2014
item
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of beginning and ending balances on TDR        
Beginning Balance $ 289us-gaap_FinancingReceivableModificationsRecordedInvestment $ 2,263us-gaap_FinancingReceivableModificationsRecordedInvestment    
Sales, paydowns, or other decreases (16)cfnl_FinancingReceivableModificationsRecordedInvestmentReductionDueToSalesPaydownsOrOtherAdjustments (279)cfnl_FinancingReceivableModificationsRecordedInvestmentReductionDueToSalesPaydownsOrOtherAdjustments    
Ending Balance 273us-gaap_FinancingReceivableModificationsRecordedInvestment 1,984us-gaap_FinancingReceivableModificationsRecordedInvestment    
Number of relationships with the Bank made by the TDRs 1cfnl_FinancingReceivableModificationsMadeConsideredTroubleDebtRestructuringsNumberOfRelationships      
Number of acquired loans classified as TDRs 0us-gaap_FinancingReceivableModificationsNumberOfContracts2      
Restructured loans, loan loss reserves 0us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment   0us-gaap_AllowanceForCreditLossesChangeInMethodOfCalculatingImpairment  
Troubled Debt Restructurings with Payment Default In The Previous Twelve Months        
Number of Loans 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 1us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1    
Real estate - commercial        
Reconciliation of beginning and ending balances on TDR        
Beginning Balance 289us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
    1,738us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
Sales, paydowns, or other decreases (16)cfnl_FinancingReceivableModificationsRecordedInvestmentReductionDueToSalesPaydownsOrOtherAdjustments
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
     
Ending Balance 273us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
1,738us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
  1,738us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateMember
Real estate - construction        
Reconciliation of beginning and ending balances on TDR        
Beginning Balance   525us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cfnl_RealEstateConstructionMember
   
Sales, paydowns, or other decreases   (279)cfnl_FinancingReceivableModificationsRecordedInvestmentReductionDueToSalesPaydownsOrOtherAdjustments
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cfnl_RealEstateConstructionMember
   
Ending Balance   $ 246us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cfnl_RealEstateConstructionMember