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Short-Term Borrowings (Details) (USD $)
Dec. 31, 2014
Oct. 01, 2014
Dec. 31, 2013
Short-term Debt [Line Items]      
Short-term borrowings $ 987,184,000us-gaap_ShortTermBorrowings   $ 511,418,000us-gaap_ShortTermBorrowings
Short-term borrowings from acquisitions   296,100,000fcnca_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedFederalFundsPurchased  
Repurchase agreements from business acquisitions   218,400,000fcnca_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedShorttermDebtRepurchaseAgreements  
Other short-term debt from acquisitions   77,700,000fcnca_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedShorttermDebtOther  
Master Notes [Member]      
Short-term Debt [Line Items]      
Short-term borrowings 410,258,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= fcnca_MasterNotesMember
  411,907,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= fcnca_MasterNotesMember
Repurchase Agreements [Member]      
Short-term Debt [Line Items]      
Short-term borrowings 294,426,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_RepurchaseAgreementsMember
  96,960,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_RepurchaseAgreementsMember
Federal Home Loan Bank Advances [Member]      
Short-term Debt [Line Items]      
Short-term borrowings 80,000,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
  0us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Federal Funds Purchased [Member]      
Short-term Debt [Line Items]      
Short-term borrowings 2,551,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
  2,551,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_FederalFundsPurchasedMember
Unsecured Debt [Member]      
Short-term Debt [Line Items]      
Line of Credit Facility, Remaining Borrowing Capacity 750,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
   
Secured Debt [Member]      
Short-term Debt [Line Items]      
Line of Credit Facility, Remaining Borrowing Capacity 1,960,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SecuredDebtMember
   
Subordinated Debt Obligations [Member]      
Short-term Debt [Line Items]      
Short-term borrowings $ 199,949,000us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SubordinatedDebtObligationsMember
  $ 0us-gaap_ShortTermBorrowings
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_SubordinatedDebtObligationsMember