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SUBSEQUENT EVENT (Details) (USD $) In Millions, unless otherwise specified | 36 Months Ended
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Dec. 31, 2012
Subsequent Events [Abstract] |
Pre-tax gain to be recognized during next quarter | $ 5.0

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- Definition Impairment Charges and Serance Costs, Pre Tax Gain Expected to be Recognized + References No definition available. + Details
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Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration