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FDIC Indemnification Asset (Changes in Receivable from FDIC) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
FDIC Indemnification Asset [Roll Forward] |  |  |
Beginning balance | $ 270,192 | $ 617,377 | $ 671,023
Additional receivable from acquisition | 0 | 0 | 316,932
Accretion of discounts and premiums, net | (85,651) | (102,394) | (32,960)
Receipt of payments from FDIC | (19,373) | (251,972) | (293,067)
Post-acquisition and other adjustments, net | (71,771) | 7,181 | (44,551)
Ending balance | $ 93,397 | $ 270,192 | $ 617,377

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- Definition Additions to Indemnification Asset During Period + References No definition available. + Details
Name: | fcnca_AdditionstoIndemnificationAssetDuringPeriod
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net premium amortization and discount accretion of FDIC indemnification asset. + References No definition available. + Details
Name: | fcnca_FDICIndemnificationAssetAmortizationofDiscountsandPremiumsNet
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition FDIC Indemnification Asset, Cash Payments to/from FDIC + References No definition available. + Details
Name: | fcnca_FDICIndemnificationAssetCashPaymentstofromFDIC
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition FDIC Indemnification Asset, Post Acquisition Adjustments + References No definition available. + Details
Name: | fcnca_FDICIndemnificationAssetPostAcquisitionAdjustments
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | fcnca_ReceivableFromFdicForLossShareAgreementsRollForward
Namespace Prefix: | fcnca_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses. + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant