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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 |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Receivable From FDIC For Loss Share Agreements [Abstract] |  |  |
FDIC Indemnification Asset | $ 74,784 |  | $ 93,397
Receivable From FDIC For Loss Share Agreements [Roll Forward] |  |  |
Balance at beginning of period | 93,397 | 270,192 |
Accretion of discounts and premiums, net | (17,744) | (26,112) |
Receipt of payments from FDIC | 3,490 | (42,519) |
Post-acquisition and other adjustments, net | (4,359) | (5,619) |
Balance at end of period |  | $ 195,942 |

X
- 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

X
- 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

X
- 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

X
- Definition Represents the carrying value of the receivable from the FDIC resulting from FDIC-assisted transactions. The carrying value is estimated using projected cash flows included in loss share agreements based on expected reimbursements for losses and applicable loss share percentages. + References No definition available. + Details
Name: | fcnca_FDICReceivableForLossShareAgreements
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

X
- 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