XML 47 R62.htm IDEA: XBRL DOCUMENT v2.3.0.15

Segment Disclosures (Narrative) (Details)	Sep. 30, 2011 investments reportablesegment interestrateswaps
Segment Reporting [Abstract]
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_SegmentReportingAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration