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Receivable from FDIC for Loss Share Agreements (Changes in Receivable from FDIC) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012
Receivable From FDIC For Loss Share Agreements [Abstract] |  |  |  |  |  |  |  |
FDIC Indemnification Asset | $ 45,140 | $ 100,553 | $ 45,140 | $ 100,553 | $ 49,959 | $ 93,397 | $ 158,013 | $ 270,192
Receivable From FDIC For Loss Share Agreements [Roll Forward] |  |  |  |  |  |  |  |
Accretion of discounts and premiums, net | (6,362) | (20,553) | (37,028) | (65,734) |  |  |  |
Receipt of payments from FDIC | 1,130 | 1,431 | 5,479 | (45,103) |  |  |  |
Post-acquisition and other adjustments, net | $ 413 | $ (38,338) | $ (16,708) | $ (58,802) |  |  |  |

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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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- Details
Name: | fcnca_ReceivableFromFdicForLossShareAgreementsAbstract
Namespace Prefix: | fcnca_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: | fcnca_
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Balance Type: | na
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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