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FDIC Indemnification Asset (Changes in Receivable from FDIC) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
FDIC Indemnification Asset [Roll Forward] |  |  |
Beginning balance | $ 28,701 | $ 93,397 | $ 270,192
FDIC Indemnification Asset, Acquisitions | 0 | 5,106 | 0
Accretion of discounts and premiums, net | (10,899) | (43,422) | (85,651)
Receipt of payments from FDIC | 33,296 | 1,286 | (19,373)
Post-acquisition and other adjustments, net | (47,044) | (27,666) | (71,771)
Ending balance | $ 4,054 | $ 28,701 | $ 93,397

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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

X
- 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

X
- Definition Amount of increases to the indemnification asset due to acquisitions of assets relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetAcquisitions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_FDICIndemnificationAssetRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration