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Segment Disclosures (Narrative) (Details) | Jun. 30, 2011
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Segment Disclosures |
Reportable segment | 1

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

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