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FDIC Loss Share Receivable (Changes in Receivable from FDIC) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Dec. 31, 2014
FDIC Loss Share Receivable [Abstract] |  |  |  |  |  |  |  |
FDIC Indemnification Asset | $ 3,108 | $ 9,276 | $ 3,108 | $ 9,276 | $ 5,281 | $ 4,054 | $ 5,808 | $ 28,701
Receivable From FDIC For Loss Share Agreements [Roll Forward] |  |  |  |  |  |  |  |
Accretion of discounts and premiums, net | (1,017) | (2,343) | (4,259) | (8,835) |  |  |  |
Receipt of payments from FDIC | 3,199 | 13,915 | 16,701 | 24,805 |  |  |  |
Post-acquisition and other adjustments, net | (4,355) | (8,104) | (11,926) | (35,395) |  |  |  |
Termination of FDIC loss share agreements | $ 0 | $ 0 | $ (1,462) | $ 0 |  |  |  |

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- Definition FDIC Indemnification Asset, Accretion of Discounts and Premiums, Net + References No definition available. + Details
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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
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- Definition FDIC Indemnification Asset, Post Acquisition Adjustments + References No definition available. + Details
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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
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Data Type: | xbrli:stringItemType
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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

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

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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