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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, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2013
FDIC Loss Share Receivable [Abstract] |  |  |  |  |  |  |  |
FDIC Indemnification Asset | $ 9,276 | $ 45,140 | $ 9,276 | $ 45,140 | $ 5,808 | $ 28,701 | $ 49,959 | $ 93,397
Receivable From FDIC For Loss Share Agreements [Roll Forward] |  |  |  |  |  |  |  |
Accretion of discounts and premiums, net | (2,343) | (6,362) | (8,835) | (37,028) |  |  |  |
Receipt of payments from FDIC | 13,915 | 1,130 | 24,805 | 5,479 |  |  |  |
Post-acquisition and other adjustments, net | $ (8,104) | $ 413 | $ (35,395) | $ (16,708) |  |  |  |

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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_
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Balance Type: | debit
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- Definition FDIC Indemnification Asset, Cash Payments to/from FDIC + References No definition available. + Details
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Namespace Prefix: | fcnca_
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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
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- Definition FDIC Loss Share Receivable [Abstract] + References No definition available. + Details
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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
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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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