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Loans and Leases (Loans and Leases Outstanding) (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Loans and Leases Receivable, Gross, Carrying Amount, Covered | $ 485,300,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered | $ 1,029,400,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net | 1,186,498,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet | 1,029,426,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet | 1,809,235,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
Non-PCI | 17,582,967,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities | 12,104,298,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities |
Total loans and leases | 18,769,465,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount | 13,133,724,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmount |
Commercial |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net | 726,123,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 781,307,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Non-PCI | 11,263,074,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 8,499,348,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Commercial | Construction and land development |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net | 78,079,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 78,915,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Non-PCI | 550,568,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 319,847,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstateConstructionFinancingReceivableMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Commercial | Mortgage |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net | 577,518,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 642,891,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Non-PCI | 7,552,948,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 6,362,490,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Commercial | Commercial and industrial |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net | 27,254,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 17,254,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Non-PCI | 1,988,934,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 1,081,158,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_CommercialAndIndustrialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Commercial | Lease financing |  |  |
Non-PCI | 571,916,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceLeasesFinancingReceivableMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 381,763,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceLeasesFinancingReceivableMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Commercial | Other commercial real estate |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net | 40,193,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstateOtherReceivableMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 41,381,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstateOtherReceivableMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Non-PCI | 244,875,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstateOtherReceivableMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 178,754,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstateOtherReceivableMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Commercial | Other |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net | 3,079,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_OtherLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 866,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_OtherLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Non-PCI | 353,833,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_OtherLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember | 175,336,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_OtherLoansMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember |
Noncommercial |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net | 460,375,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember | 248,119,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember |
Non-PCI | 6,319,893,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember | 3,604,950,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember |
Noncommercial | Mortgage |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net | 382,340,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember | 213,851,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember |
Non-PCI | 2,520,542,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember | 982,421,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_MortgageReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember |
Noncommercial | Construction and land development |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net | 912,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_ConstructionAndLandDevelopmentNoncommercialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember | 2,583,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_ConstructionAndLandDevelopmentNoncommercialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember |
Non-PCI | 120,097,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_ConstructionAndLandDevelopmentNoncommercialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember | 122,792,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_ConstructionAndLandDevelopmentNoncommercialMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember |
Noncommercial | Revolving mortgage |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net | 74,109,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember | 30,834,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember |
Non-PCI | 2,561,800,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember | 2,113,285,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_HomeEquityMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember |
Noncommercial | Consumer |  |  |
Certain Loans Acquired in Transfer Accounted for as Debt Securities, Carrying Amount, Net | 3,014,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember | 851,000us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember |
Non-PCI | 1,117,454,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember | 386,452,000fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerLoanMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = fcnca_NoncommercialSegmentMember |
Temecula Valley Bank [Member] |  |  |
Loans, not covered by FDIC loss share agreements | 177,300,000fcnca_LoansnotcoveredbyFDIClossshareagreements / fcnca_LossShareAgreementsAxis = fcnca_TemeculaValleyBankMember |  |
Venture Bank [Member] |  |  |
Loans, not covered by FDIC loss share agreements | 61,400,000fcnca_LoansnotcoveredbyFDIClossshareagreements / fcnca_LossShareAgreementsAxis = fcnca_VentureBankMember |  |
Georgian Bank [Domain] |  |  |
Loans, not covered by FDIC loss share agreements | 40,900,000fcnca_LoansnotcoveredbyFDIClossshareagreements / fcnca_LossShareAgreementsAxis = fcnca_GeorgianBankDomain |  |
Sun American Bank |  |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 41,100,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / fcnca_ExpiringAgreementsAxis = fcnca_SunAmericanBankMember |  |
First Regional Bank |  |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | 73,200,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / fcnca_ExpiringAgreementsAxis = fcnca_FirstRegionalBankMember |  |
Williamsburg First National Bank |  |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered | $ 9,100,000us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCovered / fcnca_ExpiringAgreementsAxis = fcnca_WilliamsburgFirstNationalBankMember |  |

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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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