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Derivatives (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative [Line Items] |  |  |
Fair value of collateral pledged to secure interest rate contracts | $ 7,005us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAtFairValue |  |
Incremental interest expense paid to interest rate swap counterparties | 3,321fcnca_IncrementalInterestExpensePaidToInterestRateSwapCounterparties | 3,281fcnca_IncrementalInterestExpensePaidToInterestRateSwapCounterparties | 3,095fcnca_IncrementalInterestExpensePaidToInterestRateSwapCounterparties
Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Gain (loss) expected to be reclassified in next 12 months | (2,193)us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember |  |
2011 Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Notional amount of interest rate derivatives | $ 93,500us-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 | 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 | 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
Name: | fcnca_IncrementalInterestExpensePaidToInterestRateSwapCounterparties
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_
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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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- Definition The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
Name: | us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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