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Derivatives (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Derivative [Line Items] |  |  |
Fair value of collateral pledged to secure interest rate contracts | $ 7.0 us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue |  |
Incremental interest expense paid to interest rate swap counterparties | 0.8 fcnca_IncrementalInterestExpensePaidToInterestRateSwapCounterparties | 0.8 fcnca_IncrementalInterestExpensePaidToInterestRateSwapCounterparties |
2011 Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Notional amount of interest rate derivatives | $ 93.5 us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcnca_InterestRateSwapHedgingVariableRateExposureOnTrustPreferredSecurities20112016Member |  |
Fixed rate payments, interest rate | 5.50%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = fcnca_InterestRateSwapHedgingVariableRateExposureOnTrustPreferredSecurities20112016Member |  | 5.50%us-gaap_DerivativeFixedInterestRate / us-gaap_DerivativeInstrumentRiskAxis = fcnca_InterestRateSwapHedgingVariableRateExposureOnTrustPreferredSecurities20112016Member
Variable rate payment rate | 1.75%us-gaap_DerivativeBasisSpreadOnVariableRate / us-gaap_DerivativeInstrumentRiskAxis = fcnca_InterestRateSwapHedgingVariableRateExposureOnTrustPreferredSecurities20112016Member |  | 1.75%us-gaap_DerivativeBasisSpreadOnVariableRate / us-gaap_DerivativeInstrumentRiskAxis = fcnca_InterestRateSwapHedgingVariableRateExposureOnTrustPreferredSecurities20112016Member

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- Definition Incremental interest expense paid to interest rate swap counterparties + References No definition available. + Details
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Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The percentage points added to the reference rate to compute the variable rate on the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeBasisSpreadOnVariableRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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- Details
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- Definition The fair value as of the balance sheet date of financial instruments and other positions owned by the entity and pledged to counterparties as collateral, including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=34720971&loc=SL6224234-111729 Reference 2: 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |