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Segment Disclosures (Narrative) (Details)	Jun. 30, 2011
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