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v2.4.1.9

FDIC Indemnification Asset (Changes in Receivable from FDIC) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
FDIC Indemnification Asset [Roll Forward] |  |  |
Beginning balance | $ 93,397us-gaap_FDICIndemnificationAsset | $ 270,192us-gaap_FDICIndemnificationAsset | $ 617,377us-gaap_FDICIndemnificationAsset
Additional receivable from acquisition | 5,106fcnca_AdditionstoIndemnificationAssetDuringPeriod | 0fcnca_AdditionstoIndemnificationAssetDuringPeriod | 0fcnca_AdditionstoIndemnificationAssetDuringPeriod
Accretion of discounts and premiums, net | (43,422)fcnca_FDICIndemnificationAssetAmortizationofDiscountsandPremiumsNet | (85,651)fcnca_FDICIndemnificationAssetAmortizationofDiscountsandPremiumsNet | (102,394)fcnca_FDICIndemnificationAssetAmortizationofDiscountsandPremiumsNet
Receipt of payments from FDIC | 1,286fcnca_FDICIndemnificationAssetCashPaymentstofromFDIC | (19,373)fcnca_FDICIndemnificationAssetCashPaymentstofromFDIC | (251,972)fcnca_FDICIndemnificationAssetCashPaymentstofromFDIC
Post-acquisition and other adjustments, net | (27,666)fcnca_FDICIndemnificationAssetPostAcquisitionAdjustments | (71,771)fcnca_FDICIndemnificationAssetPostAcquisitionAdjustments | 7,181fcnca_FDICIndemnificationAssetPostAcquisitionAdjustments
Ending balance | $ 28,701us-gaap_FDICIndemnificationAsset | $ 93,397us-gaap_FDICIndemnificationAsset | $ 270,192us-gaap_FDICIndemnificationAsset

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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