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Loans and Leases (Narrative) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable, Individually Evaluated for Impairment | $ 119,593,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment | $ 132,146,000us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining | 61,200,000fcnca_CertainLoansAcquiredinTransferNotAccountedforasDebtSecuritiesPurchaseDiscountRemaining |
Loans and Leases Receivable, Collateral for Secured Borrowings | 2,200,000,000us-gaap_LoansAndLeasesReceivableCollateralForSecuredBorrowings | 1,380,000,000us-gaap_LoansAndLeasesReceivableCollateralForSecuredBorrowings
Advances from Federal Home Loan Banks | 240,300,000us-gaap_AdvancesFromFederalHomeLoanBanks | 240,300,000us-gaap_AdvancesFromFederalHomeLoanBanks
Federal Home Loan Bank Advances, Current Borrowing Capacity | 1,960,000,000fcnca_FederalHomeLoanBankAdvancesCurrentBorrowingCapacity | 1,140,000,000fcnca_FederalHomeLoanBankAdvancesCurrentBorrowingCapacity
Noncovered loans pledged to secure debt obligations | 3,160,000,000us-gaap_PledgedAssetsSeparatelyReportedLoansPledgedForOtherDebtObligationsAtFairValue | 2,560,000,000us-gaap_PledgedAssetsSeparatelyReportedLoansPledgedForOtherDebtObligationsAtFairValue
Charge off of past due business credit card loans (days) | 120 days |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 485,300,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered | 1,029,400,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered
Sun American Bank |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 41,100,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / fcnca_ExpiringAgreementsAxis = fcnca_SunAmericanBankMember |
First Regional Bank |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 73,200,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / fcnca_ExpiringAgreementsAxis = fcnca_FirstRegionalBankMember |
Williamsburg First National Bank |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 9,100,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / fcnca_ExpiringAgreementsAxis = fcnca_WilliamsburgFirstNationalBankMember |
Loans on the Cost Recovery Method |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Carrying value of acquired impaired loans | $ 33,422,000fcnca_CarryingValueOfAcquiredImpairedLoans / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = fcnca_LoansOnCostRecoveryMethodMember | $ 28,493,000fcnca_CarryingValueOfAcquiredImpairedLoans / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = fcnca_LoansOnCostRecoveryMethodMember

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- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Purchase Discount Remaining + References No definition available. + Details
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- Definition Federal Home Loan Bank Advances, Current Borrowing Capacity + References No definition available. + Details
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- Definition Financing Receivable, Credit Quality, Charge Off of Past Due Balance, Period + References No definition available. + Details
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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
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- Definition Reflects the aggregate value of loans, trade receivables, securities and financial instruments that serve as collateral for obligations arising from a transfer of financial assets recorded as a secured borrowing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720971&loc=SL6224234-111729 + Details
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- Definition Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements. + References No definition available. + Details
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- Definition The fair value, as of the date of each statement of financial position presented, of loans which are owned but transferred to serve as collateral for the payment of other debt obligations, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
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