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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

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- 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

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- 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

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- 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