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RECEIVABLE FROM FDIC FOR LOSS SHARE AGREEMENTS (Changes In Receivable From FDIC) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Receivable From FDIC For Loss Share Agreements [Roll Forward] |  |  |
Balance, January 1 | $ 617,377 | $ 671,023 | $ 249,842
Additional receivable from acquisitions | 0 | 316,932 | 512,778
Amortization of discounts and premiums, net | (102,394) | (32,960) | (12,891)
Receipt of payments from FDIC | (251,972) | (293,067) | (52,422)
Post-acquisition and other adjustments, net | 7,181 | (44,551) | (26,284)
Balance, December 31 | $ 270,192 | $ 617,377 | $ 671,023
Maximum period of fair value refinement after transaction closing date | 1 year | 1 year |

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- Definition Represents the fair value of the receivable from the FDIC resulting from FDIC-assisted transactions. Fair value 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
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Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition FDIC Receivable for Loss Share Agreements, Accretion of Discounts and Premiums, Net + References No definition available. + Details
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- Definition FDIC Receivable for Loss Share Agreements Additions During Period + References No definition available. + Details
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Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition FDIC Receivable for Loss Share Agreements, 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 Receivable for Loss Share Agreements, Receipt of Payments from FDIC During Period + References No definition available. + Details
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Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
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- Definition Maximum Period Of Fair Value Refinement After Transaction Closing Date + References No definition available. + Details
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Namespace Prefix: | fcnca_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration