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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current tax expense      
Federal $ 84,430us-gaap_CurrentFederalTaxExpenseBenefit $ 46,848us-gaap_CurrentFederalTaxExpenseBenefit $ 89,939us-gaap_CurrentFederalTaxExpenseBenefit
State 13,941us-gaap_CurrentStateAndLocalTaxExpenseBenefit 7,080us-gaap_CurrentStateAndLocalTaxExpenseBenefit 9,212us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current tax expense 98,371us-gaap_CurrentIncomeTaxExpenseBenefit 53,928us-gaap_CurrentIncomeTaxExpenseBenefit 99,151us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit)      
Federal (30,658)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 38,731us-gaap_DeferredFederalIncomeTaxExpenseBenefit (26,501)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State (2,681)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 8,915us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (7,921)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred tax expense (benefit) (33,339)us-gaap_DeferredIncomeTaxExpenseBenefit 47,646us-gaap_DeferredIncomeTaxExpenseBenefit (34,422)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense 65,032us-gaap_IncomeTaxExpenseBenefit 101,574us-gaap_IncomeTaxExpenseBenefit 64,729us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Income taxes at statutory rates 71,258us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 93,956us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 68,993us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (reduction) in income taxes resulting from: [Abstract]      
Nontaxable income on loans, leases and investments, net of nondeductible expenses (1,832)fcnca_IncomeTaxReconciliationNondeductibleExpenseLoansLeasesAndInvestments (1,185)fcnca_IncomeTaxReconciliationNondeductibleExpenseLoansLeasesAndInvestments (1,309)fcnca_IncomeTaxReconciliationNondeductibleExpenseLoansLeasesAndInvestments
State and local income taxes, including change in valuation allowance, net of federal income tax benefit 7,319us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 10,397us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 839us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Effective Income Tax Rate Reconciliation, Acquisition Stock Settlement, Amount (10,185)fcnca_EffectiveIncomeTaxRateReconciliationAcquisitionStockSettlementAmount 0fcnca_EffectiveIncomeTaxRateReconciliationAcquisitionStockSettlementAmount 0fcnca_EffectiveIncomeTaxRateReconciliationAcquisitionStockSettlementAmount
Tax credits (2,896)us-gaap_IncomeTaxReconciliationTaxCredits (960)us-gaap_IncomeTaxReconciliationTaxCredits (2,372)us-gaap_IncomeTaxReconciliationTaxCredits
Other, net 1,368us-gaap_IncomeTaxReconciliationOtherReconcilingItems (634)us-gaap_IncomeTaxReconciliationOtherReconcilingItems (1,422)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Total income tax expense 65,032us-gaap_IncomeTaxExpenseBenefit 101,574us-gaap_IncomeTaxExpenseBenefit 64,729us-gaap_IncomeTaxExpenseBenefit
Deferred Tax Assets, Net [Abstract]      
Allowance for loan and lease losses 79,537fcnca_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanAndLeaseLosses 90,790fcnca_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanAndLeaseLosses  
Pension liability 15,391us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 2,593us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions  
Executive separation from service agreements 23,849fcnca_DeferredTaxAssetsTaxDeferredExpenseExecutiveSeparationFromServiceAgreements 9,321fcnca_DeferredTaxAssetsTaxDeferredExpenseExecutiveSeparationFromServiceAgreements  
State operating loss carryforwards 29us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 36us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal  
Unrealized loss on cash flow hedge 1,673us-gaap_DeferredTaxAssetsHedgingTransactions 2,786us-gaap_DeferredTaxAssetsHedgingTransactions  
Net unrealized loss on securities included in accumulated other comprehensive loss 0us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross 6,541us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross  
Deferred Tax Assets, Property, Plant and Equipment 5,550us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 0us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment  
Deferred Tax Assets, FDIC-Assisted Transaction Timing Differences, Amount 71,219fcnca_DeferredTaxAssetsFDICAssistedTransactionTimingDifferencesAmount 42,016fcnca_DeferredTaxAssetsFDICAssistedTransactionTimingDifferencesAmount  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves 15,326us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves 6,958us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves  
Other 25,746us-gaap_DeferredTaxAssetsOther 10,569us-gaap_DeferredTaxAssetsOther  
Gross deferred tax asset 238,320us-gaap_DeferredTaxAssetsGross 171,610us-gaap_DeferredTaxAssetsGross  
Accelerated depreciation 0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 4,382us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Lease financing activities 10,762us-gaap_DeferredTaxLiabilitiesFinancingArrangements 10,216us-gaap_DeferredTaxLiabilitiesFinancingArrangements  
Net unrealized gain on securities included in accumulated other comprehensive loss 3,245us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome 0us-gaap_DeferredTaxLiabilitiesOtherComprehensiveIncome  
Net deferred loan fees and costs 4,772us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts 4,302us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts  
Intangible assets 7,729us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 17,558us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets  
Deferred Tax Liability, Mark to Market Section 475, Amount 34,289fcnca_DeferredTaxLiabilityMarktoMarketSection475Amount 0fcnca_DeferredTaxLiabilityMarktoMarketSection475Amount  
Other 11,395us-gaap_DeferredTaxLiabilitiesOther 4,564us-gaap_DeferredTaxLiabilitiesOther  
Deferred tax liability 72,192us-gaap_DeferredTaxLiabilities 41,022us-gaap_DeferredTaxLiabilities  
Net deferred tax assets $ 166,128us-gaap_DeferredTaxAssetsLiabilitiesNet $ 130,588us-gaap_DeferredTaxAssetsLiabilitiesNet