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Estimated Fair Values (Assets And Liabilities Carried At Fair Value On A Nonrecurring Basis) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Fair Value [Member]
Loans held for sale	$ 56,004	$ 88,933	$ 91,076
Impaired loans, Covered by loss share agreements	196,759	192,406	356,111
Impaired loans, Not covered by loss share agreements	103,546	89,500	50,676
Fair Value, Inputs, Level 1 [Member]
Loans held for sale
Impaired loans, Covered by loss share agreements
Impaired loans, Not covered by loss share agreements
Fair Value, Inputs, Level 2 [Member]
Loans held for sale	56,004	88,933	91,076
Fair Value, Inputs, Level 3 [Member]
Impaired loans, Covered by loss share agreements	196,759	192,406	356,111
Impaired loans, Not covered by loss share agreements	$ 103,546	$ 89,500	$ 50,676

X

- Definition

Impaired loans covered by loss share agreements

+ Details

Name:	fcnca_ImpairedLoansCoveredByLossShareAgreements
Namespace Prefix:	fcnca
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Impaired loans not covered by loss share agreements

+ Details

Name:	fcnca_ImpairedLoansNotCoveredByLossShareAgreements
Namespace Prefix:	fcnca
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The face amount of loans that will be sold to other entities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 01-6
-Paragraph 13
-Subparagraph d

+ Details

Name:	us-gaap_LoansReceivableHeldForSaleAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant