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Loans and Leases (Loans and Leases Outstanding) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Originated $ 17,844,414fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities $ 17,582,967fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities    
PCI loans 1,247,343us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet 1,186,498us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet 1,270,818us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet 1,029,426us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
Total loans and leases 19,091,757us-gaap_LoansAndLeasesReceivableGrossCarryingAmount 18,769,465us-gaap_LoansAndLeasesReceivableGrossCarryingAmount    
Commercial        
Originated 11,493,458fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
11,263,074fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
PCI loans 791,756us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
726,123us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Commercial | Construction and land development        
Originated 608,556fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
550,568fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
PCI loans 70,049us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
78,079us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateConstructionFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Commercial | Mortgage        
Originated 7,591,745fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
7,552,948fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
PCI loans 653,846us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
577,518us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Commercial | Commercial and industrial        
Originated 2,072,414fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_CommercialAndIndustrialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
1,988,934fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_CommercialAndIndustrialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
PCI loans 24,134us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_CommercialAndIndustrialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
27,254us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_CommercialAndIndustrialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Commercial | Lease financing        
Originated 603,737fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
571,916fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_FinanceLeasesFinancingReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Commercial | Other commercial real estate        
Originated 262,293fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
244,875fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
PCI loans 40,841us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
40,193us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_CommercialRealEstateOtherReceivableMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Commercial | Other        
Originated 354,713fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_OtherLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
353,833fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_OtherLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
PCI loans 2,886us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_OtherLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
3,079us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_OtherLoansMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Noncommerical        
Originated 6,350,956fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
6,319,893fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
   
PCI loans 455,587us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
460,375us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
   
Noncommerical | Mortgage        
Originated 2,524,549fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
2,520,542fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
   
PCI loans 380,490us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
382,340us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
   
Noncommerical | Construction and land development        
Originated 170,208fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_ConstructionAndLandDevelopmentNoncommercialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
120,097fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_ConstructionAndLandDevelopmentNoncommercialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
   
PCI loans 874us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_ConstructionAndLandDevelopmentNoncommercialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
912us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcnca_ConstructionAndLandDevelopmentNoncommercialMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
   
Noncommerical | Revolving mortgage        
Originated 2,528,257fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
2,561,800fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
   
PCI loans 70,363us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
74,109us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_HomeEquityMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
   
Noncommerical | Consumer        
Originated 1,127,942fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
1,117,454fcnca_LoansandLeasesnotacquiredintransferaccountedforasdebtsecurities
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
   
PCI loans $ 3,860us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember
$ 3,014us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_ConsumerLoanMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fcnca_NoncommercialSegmentMember