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FDIC Loss Share Receivable (Changes in Receivable from FDIC) (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014
FDIC Loss Share Receivable [Abstract] |  |  |  |
FDIC Indemnification Asset | $ 7,474 | $ 21,340 | $ 4,054 | $ 28,701
Receivable From FDIC For Loss Share Agreements [Roll Forward] |  |  |  |
Accretion of discounts and premiums, net | (2,375) | (5,031) |  |
Receipt of payments from FDIC | 9,871 | 5,762 |  |
Post-acquisition and other adjustments, net | $ (4,076) | $ (8,092) |  |

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- Definition FDIC Indemnification Asset, Accretion of Discounts and Premiums, Net + References No definition available. + Details
Name: | fcnca_FDICIndemnificationAssetAccretionofDiscountsandPremiumsNet
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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- Definition FDIC Loss Share Receivable [Abstract] + References No definition available. + Details
Name: | fcnca_FDICLossShareReceivableAbstract
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

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