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Loans and Leases (Loans and Leases Outstanding) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2011
--- | --- | --- | ---
Covered loans | $ 1,999,351 | [1] | $ 2,362,152 | [2] | $ 2,399,738 | [1]
Noncovered loans and leases | 11,462,458 | [1] | 11,581,637 | [2] | 11,528,854 | [1]
Total loans and leases | 13,461,809 |  | 13,943,789 |  | 13,928,592 |
Commercial Mortgage |  |  |  |  |  |
Covered loans | 1,598,579 |  | 1,872,685 |  | 1,947,422 |
Noncovered loans and leases | 7,825,628 |  | 7,866,572 |  | 7,697,242 |
Non-Commercial Loans |  |  |  |  |  |
Covered loans | 400,772 |  | 489,467 |  | 452,316 |
Noncovered loans and leases | 3,636,830 |  | 3,715,065 |  | 3,831,612 |
Construction and Land Development | Commercial Mortgage |  |  |  |  |  |
Covered loans | 272,445 |  | 338,873 |  | 338,650 |
Noncovered loans and leases | 329,151 |  | 381,163 |  | 407,134 |
Construction and Land Development | Non-Commercial Loans |  |  |  |  |  |
Covered loans | 39,294 |  | 105,536 |  | 82,177 |
Noncovered loans and leases | 127,726 |  | 137,271 |  | 145,445 |
Commercial Mortgage | Commercial Mortgage |  |  |  |  |  |
Covered loans | 1,142,677 |  | 1,260,589 |  | 1,307,775 |
Noncovered loans and leases | 5,149,696 |  | 5,104,993 |  | 4,861,457 |
Other Commercial Real Estate | Commercial Mortgage |  |  |  |  |  |
Covered loans | 115,787 |  | 158,394 |  | 173,606 |
Noncovered loans and leases | 162,579 |  | 144,771 |  | 148,977 |
Lease Financing | Commercial Mortgage |  |  |  |  |  |
Covered loans | 0 |  | 57 |  | 224 |
Noncovered loans and leases | 320,703 |  | 312,869 |  | 303,104 |
Other | Commercial Mortgage |  |  |  |  |  |
Covered loans | 1,228 |  | 1,330 |  | 1,675 |
Noncovered loans and leases | 140,738 |  | 158,369 |  | 170,758 |
Residential Mortgage | Non-Commercial Loans |  |  |  |  |  |
Covered loans | 322,053 |  | 327,568 |  | 354,033 |
Noncovered loans and leases | 809,230 |  | 784,118 |  | 825,610 |
Revolving Mortgage | Non-Commercial Loans |  |  |  |  |  |
Covered loans | 37,110 |  | 51,552 |  | 11,933 |
Noncovered loans and leases | 2,268,210 |  | 2,296,306 |  | 2,303,687 |
Consumer | Non-Commercial Loans |  |  |  |  |  |
Covered loans | 2,315 |  | 4,811 |  | 4,173 |
Noncovered loans and leases | $ 431,664 |  | $ 497,370 |  | $ 556,870 |
[1] | Unaudited
[2] | Derived from 2011 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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- Definition Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases. These loans are not covered under loss share agreements with the FDIC since not acquired in FDIC-assisted transaction. + 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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- Definition Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, prior to deducting deferred income and the allowance for losses on loans and leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 01-6 -Paragraph 13 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4428-111522 + Details
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Namespace Prefix: | us-gaap_
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