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Derivatives (Schedule Of Interest Rate Swaps) (Details) (2011 Interest Rate Swap, USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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2011 Interest Rate Swap |  |
Derivative [Line Items] |  |
Estimated fair value of liability | $ 3,761 us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = fcnca_InterestRateSwapHedgingVariableRateExposureOnTrustPreferredSecurities20112016Member | $ 4,337 us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue / us-gaap_DerivativeInstrumentRiskAxis = fcnca_InterestRateSwapHedgingVariableRateExposureOnTrustPreferredSecurities20112016Member
Derivative, Notional Amount | $ 93,500 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcnca_InterestRateSwapHedgingVariableRateExposureOnTrustPreferredSecurities20112016Member | $ 93,500 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = fcnca_InterestRateSwapHedgingVariableRateExposureOnTrustPreferredSecurities20112016Member

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
Name: | us-gaap_InterestRateCashFlowHedgeLiabilityAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant