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v2.4.1.9

Short-Term Borrowings (Details) (USD $) | Dec. 31, 2014 | Oct. 01, 2014 | Dec. 31, 2013
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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

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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Federal Funds Purchased + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Short-term Debt, Other + References No definition available. + Details
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- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Short-term Debt, Repurchase Agreements + References No definition available. + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 + Details
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