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Derivatives (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Derivative [Line Items] |  |  |  |
Incremental interest expense paid to interest rate swap counterparties | $ 829 | $ 1,500 | $ 2,500 |
2011 Interest Rate Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Fixed rate payments, interest rate |  |  |  | 5.50%
Variable rate payment rate |  | 1.75% |  | 1.75%

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=fcnca_InterestRateSwapHedgingVariableRateExposureOnTrustPreferredSecurities20112016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |