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Mortgage Servicing Rights Mortgage Servicing Rights (MSR Carrying Value) ((Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Servicing Asset at Amortized Cost [Line Items]        
Mortgage servicing rights $ 16,436us-gaap_ServicingAsset $ 0us-gaap_ServicingAsset $ 16,688us-gaap_ServicingAsset $ 16us-gaap_ServicingAsset
Amortization of Mortgage Servicing Rights (MSRs) (852)us-gaap_AmortizationOfMortgageServicingRightsMSRs (164)us-gaap_AmortizationOfMortgageServicingRightsMSRs    
Servicing Asset at Amortized Cost, Additions 662us-gaap_ServicingAssetAtAmortizedValueAdditions 0us-gaap_ServicingAssetAtAmortizedValueAdditions    
Valuation Allowance for Impairment of Recognized Servicing Assets, Provisions 62us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries 0us-gaap_ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisionsRecoveries    
1st Financial        
Servicing Asset at Amortized Cost [Line Items]        
Servicing Asset at Amortized Cost, Additions $ 0us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_BusinessAcquisitionAxis
= fcnca_A1stFinancialMember
$ 148us-gaap_ServicingAssetAtAmortizedValueAdditions
/ us-gaap_BusinessAcquisitionAxis
= fcnca_A1stFinancialMember