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Loans and Leases (Changes In Carrying Amount Of Accretable Yield) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Oct. 01, 2014
Dec. 31, 2012
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]        
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition     $ 4,708,681us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodContractuallyRequiredPaymentsReceivableAtAcquisition  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition     59,187us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodCashFlowsExpectedToBeCollectedAtAcquisition  
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value     4,175,586us-gaap_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodAtAcquisitionAtFairValue  
Changes in Amount of Accretable Yield [Roll Forward]        
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield 418,160us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield 439,990us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield   539,564us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYield
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Accretable Yield, Additions 111,973us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldAdditions 0us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldAdditions    
Accretion (112,368)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldAccretion (224,672)us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldAccretion    
Reclassifications from nonaccretable difference 7,865us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference 92,349us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesAccretableYieldReclassificationsFromNonaccretableDifference    
Changes in expected cash flows that do not affect nonaccretable difference $ (29,300)fcnca_CertainLoansAcquiredinTransferAccountedforasDebtSecuritiesAccretableYieldChangesinExpectedCashFlowsNotAffectingNonaccretableDifference $ 32,749fcnca_CertainLoansAcquiredinTransferAccountedforasDebtSecuritiesAccretableYieldChangesinExpectedCashFlowsNotAffectingNonaccretableDifference