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Goodwill and Intangible Assets (Details) (USD $)
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Rate
Dec. 31, 2013
Dec. 31, 2012
Jan. 02, 2014
Oct. 02, 2014
Servicing Asset at Amortized Cost [Line Items]          
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 14.25%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed        
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets $ 1,300,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets $ 300,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets $ 600,000us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans 56,020.00fcnca_ServicingAssetsandServicingLiabilitiesatFairValueAssumptionsUsedtoEstimateFairValueCosttoServiceLoans        
Beginning Balance, Servicing Asset 16,000us-gaap_ServicingAsset 1,784,000us-gaap_ServicingAsset   16,000us-gaap_ServicingAsset  
Amortization (919,000)us-gaap_AmortizationOfMortgageServicingRightsMSRs (205,000)us-gaap_AmortizationOfMortgageServicingRightsMSRs (2,600,000)us-gaap_AmortizationOfMortgageServicingRightsMSRs    
Servicing Asset at Fair Value, Additions 727,000us-gaap_ServicingAssetAtFairValueAdditions 0us-gaap_ServicingAssetAtFairValueAdditions      
Servicing assets sold 0us-gaap_ProceedsFromSaleOfMortgageServicingRightsMSR (1,563,000)us-gaap_ProceedsFromSaleOfMortgageServicingRightsMSR      
Valuation Allowance (850,000)us-gaap_ServicingAssetAtAmortizedValueValuationAllowance 0us-gaap_ServicingAssetAtAmortizedValueValuationAllowance (302,000)us-gaap_ServicingAssetAtAmortizedValueValuationAllowance    
Servicing Asset at Fair Value, Amount   16,000us-gaap_ServicingAssetAtFairValueAmount      
Ending Balance, Servicing Asset 16,688,000us-gaap_ServicingAsset 16,000us-gaap_ServicingAsset 1,784,000us-gaap_ServicingAsset    
Goodwill [Roll Forward]          
Beginning goodwill 102,625,000us-gaap_Goodwill     102,625,000us-gaap_Goodwill  
Ending goodwill 139,773,000us-gaap_Goodwill 102,625,000us-gaap_Goodwill      
Finite-lived Intangible Assets [Roll Forward]          
Beginning balance 1,247,000us-gaap_IntangibleAssetsNetExcludingGoodwill 3,556,000us-gaap_IntangibleAssetsNetExcludingGoodwill   1,247,000us-gaap_IntangibleAssetsNetExcludingGoodwill  
Amortization (6,955,000)us-gaap_AmortizationOfIntangibleAssets (2,309,000)us-gaap_AmortizationOfIntangibleAssets (3,476,000)us-gaap_AmortizationOfIntangibleAssets    
Ending balance 89,922,000us-gaap_IntangibleAssetsNetExcludingGoodwill 1,247,000us-gaap_IntangibleAssetsNetExcludingGoodwill 3,556,000us-gaap_IntangibleAssetsNetExcludingGoodwill    
Finite-Lived Intangible Assets [Abstract]          
Gross balance 114,596,000us-gaap_FiniteLivedIntangibleAssetsGross 18,966,000us-gaap_FiniteLivedIntangibleAssetsGross      
Accumulated amortization (24,674,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (17,719,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization      
Carrying value 89,922,000us-gaap_FiniteLivedIntangibleAssetsNet 1,247,000us-gaap_FiniteLivedIntangibleAssetsNet      
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]          
2015 18,576,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths        
2016 16,200,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo        
2017 13,951,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree        
2018 11,701,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour        
2019 9,457,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive        
1st Financial          
Servicing Asset at Amortized Cost [Line Items]          
Finite-Lived Core Deposits, Gross 3,800,000us-gaap_FiniteLivedCoreDepositsGross
/ us-gaap_BusinessAcquisitionAxis
= fcnca_A1stFinancialMember		        
Servicing Asset at Fair Value, Additions 148,000us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_BusinessAcquisitionAxis
= fcnca_A1stFinancialMember		 0us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_BusinessAcquisitionAxis
= fcnca_A1stFinancialMember		      
Goodwill [Roll Forward]          
Goodwill acquired 32,915,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= fcnca_A1stFinancialMember		 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= fcnca_A1stFinancialMember		   32,915,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= fcnca_A1stFinancialMember		  
Useful life 3 months        
Finite-lived Intangible Assets [Roll Forward]          
Intangible assets acquired 3,780,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= fcnca_A1stFinancialMember		 0us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= fcnca_A1stFinancialMember		      
Bancorporation          
Servicing Asset at Amortized Cost [Line Items]          
Finite-Lived Core Deposits, Gross 88,000,000us-gaap_FiniteLivedCoreDepositsGross
/ us-gaap_BusinessAcquisitionAxis
= fcnca_BancorporationMember		        
Servicing Asset at Fair Value, Additions 17,566,000us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_BusinessAcquisitionAxis
= fcnca_BancorporationMember		 0us-gaap_ServicingAssetAtFairValueAdditions
/ us-gaap_BusinessAcquisitionAxis
= fcnca_BancorporationMember		      
Goodwill [Roll Forward]          
Goodwill acquired 4,233,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= fcnca_BancorporationMember		 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= fcnca_BancorporationMember		     4,233,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_BusinessAcquisitionAxis
= fcnca_BancorporationMember
Useful life 5 years 6 months        
Finite-lived Intangible Assets [Roll Forward]          
Intangible assets acquired $ 91,850,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= fcnca_BancorporationMember		 $ 0us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_BusinessAcquisitionAxis
= fcnca_BancorporationMember		      
Conventional fixed loans          
Servicing Asset at Amortized Cost [Line Items]          
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 7.20%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FixedRateResidentialMortgageMember		        
All loans and leases excluding conventional fixed loans [Member]          
Servicing Asset at Amortized Cost [Line Items]          
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 9.20%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_AllLoansandLeasesExcludingConventionalFixedLoansMember		        
Core deposits | Minimum          
Goodwill [Roll Forward]          
Useful life 1 year        
Core deposits | Maximum          
Goodwill [Roll Forward]          
Useful life 10 years