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Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis) (Details) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2011
--- | --- | --- | ---
Fair Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held for sale | $ 52,228 | $ 63,470 | $ 78,178
Impaired loans not covered by loss share agreements | 30,828 | 128,365 | 81,661
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1 Inputs) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held for sale | 0 | 0 | 0
Impaired loans not covered by loss share agreements | 0 | 0 | 0
Quoted Prices for Similar Assets and Liabilities (Level 2 Inputs) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held for sale | 52,228 | 63,470 | 78,178
Impaired loans not covered by loss share agreements | 0 | 0 | 0
Significant Unobservable Inputs (Level 3 Inputs) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held for sale | 0 | 0 | 0
Impaired loans not covered by loss share agreements | $ 30,828 | $ 128,365 | $ 81,661

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- Definition Impaired loans not covered by loss share agreements + References No definition available. + Details
Name: | fcnca_ImpairedLoansNotCoveredByLossShareAgreements
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loans held-for-sale as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_LoansHeldForSaleFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant