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Loans and Leases (Loans Acquired By Loan Class) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | $ 1,621,327 | [1] | $ 1,809,235 | [2] | $ 2,183,869 | [1]
Commercial Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,292,943 |  | 1,450,035 |  | 1,745,709 |
Commercial Mortgage | Construction and Land Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 204,524 |  | 237,906 |  | 310,601 |
Commercial Mortgage | Commercial Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 948,452 |  | 1,054,473 |  | 1,195,541 |
Commercial Mortgage | Other Commercial Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 93,232 |  | 107,119 |  | 144,978 |
Commercial Mortgage | Commercial and Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 45,693 |  | 49,463 |  | 93,261 |
Commercial Mortgage | Lease Financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 0 |  | 0 |  | 45 |
Commercial Mortgage | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,042 |  | 1,074 |  | 1,283 |
Non-Commercial Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 328,384 |  | 359,200 |  | 438,160 |
Non-Commercial Loans | Construction and Land Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 11,024 |  | 20,793 |  | 85,555 |
Non-Commercial Loans | Residential Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 278,997 |  | 297,926 |  | 298,538 |
Non-Commercial Loans | Revolving Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 37,139 |  | 38,710 |  | 50,016 |
Non-Commercial Loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,224 |  | 1,771 |  | 4,051 |
Impaired At Acquisition Date |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 255,267 |  | 290,626 |  | 391,941 |
Impaired At Acquisition Date | Commercial Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 190,946 |  | 217,807 |  | 272,736 |
Impaired At Acquisition Date | Commercial Mortgage | Construction and Land Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 53,209 |  | 71,225 |  | 100,736 |
Impaired At Acquisition Date | Commercial Mortgage | Commercial Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 101,397 |  | 107,281 |  | 122,876 |
Impaired At Acquisition Date | Commercial Mortgage | Other Commercial Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 30,191 |  | 35,369 |  | 31,727 |
Impaired At Acquisition Date | Commercial Mortgage | Commercial and Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 6,149 |  | 3,932 |  | 17,397 |
Impaired At Acquisition Date | Commercial Mortgage | Lease Financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 0 |  | 0 |  | 0 |
Impaired At Acquisition Date | Commercial Mortgage | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 0 |  | 0 |  | 0 |
Impaired At Acquisition Date | Non-Commercial Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 64,321 |  | 72,819 |  | 119,205 |
Impaired At Acquisition Date | Non-Commercial Loans | Construction and Land Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 10,609 |  | 15,136 |  | 56,722 |
Impaired At Acquisition Date | Non-Commercial Loans | Residential Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 43,924 |  | 48,077 |  | 46,905 |
Impaired At Acquisition Date | Non-Commercial Loans | Revolving Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 9,788 |  | 9,606 |  | 14,125 |
Impaired At Acquisition Date | Non-Commercial Loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 0 |  | 0 |  | 1,453 |
All Other Acquired Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,366,060 |  | 1,518,609 |  | 1,791,928 |
All Other Acquired Loans | Commercial Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,101,997 |  | 1,232,228 |  | 1,472,973 |
All Other Acquired Loans | Commercial Mortgage | Construction and Land Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 151,315 |  | 166,681 |  | 209,865 |
All Other Acquired Loans | Commercial Mortgage | Commercial Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 847,055 |  | 947,192 |  | 1,072,665 |
All Other Acquired Loans | Commercial Mortgage | Other Commercial Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 63,041 |  | 71,750 |  | 113,251 |
All Other Acquired Loans | Commercial Mortgage | Commercial and Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 39,544 |  | 45,531 |  | 75,864 |
All Other Acquired Loans | Commercial Mortgage | Lease Financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 0 |  | 0 |  | 45 |
All Other Acquired Loans | Commercial Mortgage | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 1,042 |  | 1,074 |  | 1,283 |
All Other Acquired Loans | Non-Commercial Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 264,063 |  | 286,381 |  | 318,955 |
All Other Acquired Loans | Non-Commercial Loans | Construction and Land Development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 415 |  | 5,657 |  | 28,833 |
All Other Acquired Loans | Non-Commercial Loans | Residential Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 235,073 |  | 249,849 |  | 251,633 |
All Other Acquired Loans | Non-Commercial Loans | Revolving Mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | 27,351 |  | 29,104 |  | 35,891 |
All Other Acquired Loans | Non-Commercial Loans | Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Covered loans | $ 1,224 |  | $ 1,771 |  | $ 2,598 |
[1] | Unaudited
[2] | Derived from 2012 Annual Report on Form 10-K.

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- Definition Covered Under Loss Share Agreement In Loans And Leases + References No definition available. + Details
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Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration