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Loans and Leases (Narrative) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]        
PCI loans $ 1,247,343,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet $ 1,186,498,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet $ 1,270,818,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet $ 1,029,426,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
Noncovered loans pledged to secure debt obligations 3,250,000,000us-gaap_PledgedAssetsSeparatelyReportedLoansPledgedForOtherDebtObligationsAtFairValue 3,160,000,000us-gaap_PledgedAssetsSeparatelyReportedLoansPledgedForOtherDebtObligationsAtFairValue    
Charge off of past due business credit card loans (days) 120 days      
Loans and Leases Receivable, Collateral for Secured Borrowings 2,300,000,000us-gaap_LoansAndLeasesReceivableCollateralForSecuredBorrowings 2,200,000,000us-gaap_LoansAndLeasesReceivableCollateralForSecuredBorrowings    
Advances from Federal Home Loan Banks 290,300,000us-gaap_AdvancesFromFederalHomeLoanBanks 240,300,000us-gaap_AdvancesFromFederalHomeLoanBanks    
Federal Home Loan Bank Advances, Current Borrowing Capacity 2,010,000,000fcnca_FederalHomeLoanBankAdvancesCurrentBorrowingCapacity 1,960,000,000fcnca_FederalHomeLoanBankAdvancesCurrentBorrowingCapacity    
Loans and Leases Receivable, Gross, Carrying Amount, Covered 443,100,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered 485,300,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered    
Bancorporation        
Financing Receivable, Recorded Investment [Line Items]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining 55,700,000fcnca_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesPurchaseDiscountRemaining
/ us-gaap_BusinessAcquisitionAxis
= fcnca_BancorporationMember
61,200,000fcnca_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesPurchaseDiscountRemaining
/ us-gaap_BusinessAcquisitionAxis
= fcnca_BancorporationMember
   
Sun American Bank        
Financing Receivable, Recorded Investment [Line Items]        
PCI loans 43,200,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ fcnca_ExpiringAgreementsAxis
= fcnca_SunAmericanBankMember
     
First Regional Bank        
Financing Receivable, Recorded Investment [Line Items]        
PCI loans 53,900,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ fcnca_ExpiringAgreementsAxis
= fcnca_FirstRegionalBankMember
     
Williamsburg First National Bank        
Financing Receivable, Recorded Investment [Line Items]        
PCI loans $ 8,400,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ fcnca_ExpiringAgreementsAxis
= fcnca_WilliamsburgFirstNationalBankMember