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Accounting Policies and Other Matters (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012
Accounting Policies [Abstract] |
Maximum period of fair value refinement after transaction closing date | 1 year
Adjustments to acquisition gains | $ 0

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- Definition Gain on Purchase of Business, Adjustments Related to Acquisition Date Fair Values + References No definition available. + Details
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Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum Period Of Fair Value Refinement After Transaction Closing Date + References No definition available. + Details
Name: | fcnca_MaximumPeriodOfFairValueRefinementAfterTransactionClosingDate
Namespace Prefix: | fcnca_
Data Type: | us-types:durationStringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration