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

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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 recorded balance, net of any applicable reductions (for example, unamortized accretable yield and other-than-temporary impairments), for loans accounted for as debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + 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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