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v2.4.1.9

Receivable from FDIC for Loss Share Agreements (Changes in Receivable from FDIC) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Receivable From FDIC For Loss Share Agreements [Abstract] |  |  |  |
FDIC Indemnification Asset | $ 21,340 us-gaap_FDICIndemnificationAsset | $ 74,784 us-gaap_FDICIndemnificationAsset | $ 28,701 us-gaap_FDICIndemnificationAsset | $ 93,397 us-gaap_FDICIndemnificationAsset
Receivable From FDIC For Loss Share Agreements [Roll Forward] |  |  |  |
Accretion of discounts and premiums, net | (5,031)fcnca_FDICIndemnificationAssetAccretionofDiscountsandPremiumsNet | (17,744)fcnca_FDICIndemnificationAssetAccretionofDiscountsandPremiumsNet |  |
Receipt of payments from FDIC | 5,762 fcnca_FDICIndemnificationAssetCashPaymentstofromFDIC | 3,490 fcnca_FDICIndemnificationAssetCashPaymentstofromFDIC |  |
Post-acquisition and other adjustments, net | $ (8,092)fcnca_FDICIndemnificationAssetPostAcquisitionAdjustments | $ (4,359)fcnca_FDICIndemnificationAssetPostAcquisitionAdjustments |  |

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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
Name: | fcnca_ReceivableFromFdicForLossShareAgreementsRollForward
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