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Segment Disclosures (Narrative) (Details) | Sep. 30, 2011 investments reportablesegment interestrateswaps
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Segment Reporting [Abstract] |
Reportable segment | 1

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- Definition Represents the number of segments. + Details
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Namespace Prefix: | fcnca
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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