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Allowance for Probable Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Loan portfolio by credit quality indicator |  |
Portfolio, total | $ 5,053,475 | $ 5,410,003
Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 4,496,404 | 4,760,129
Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 165,714 | 187,119
Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 59,349 | 92,640
Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 195,703 | 244,915
Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 136,305 | 125,200
Commercial |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 773,816 | 830,524
Commercial | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 655,154 | 741,006
Commercial | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 5,279 | 14,015
Commercial | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 6,361 | 7,187
Commercial | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 79,419 | 44,890
Commercial | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 27,603 | 23,426
Commercial real estate: other construction and land development |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,273,389 | 1,473,471
Commercial real estate: other construction and land development | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,058,843 | 1,100,430
Commercial real estate: other construction and land development | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 76,722 | 117,058
Commercial real estate: other construction and land development | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 11,083 | 53,770
Commercial real estate: other construction and land development | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 66,313 | 125,006
Commercial real estate: other construction and land development | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 60,428 | 77,207
Commercial real estate: farmland and commercial |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,664,687 | 1,688,563
Commercial real estate: farmland and commercial | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,449,822 | 1,521,243
Commercial real estate: farmland and commercial | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 83,581 | 42,353
Commercial real estate: farmland and commercial | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 40,510 | 29,936
Commercial real estate: farmland and commercial | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 48,543 | 73,187
Commercial real estate: farmland and commercial | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 42,231 | 21,844
Commercial real estate: multifamily |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 121,599 | 96,791
Commercial real estate: multifamily | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 121,188 | 94,973
Commercial real estate: multifamily | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total |  | 1,345
Commercial real estate: multifamily | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 411 | 473
Residential: first lien |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 495,722 | 533,455
Residential: first lien | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 490,924 | 526,504
Residential: first lien | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 132 | 2,237
Residential: first lien | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 974 | 1,747
Residential: first lien | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,402 | 952
Residential: first lien | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 2,290 | 2,015
Residential: junior lien |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 400,148 | 415,527
Residential: junior lien | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 397,861 | 415,021
Residential: junior lien | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 319 |
Residential: junior lien | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 6 | 307
Residential: junior lien | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,962 | 199
Consumer |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 94,109 | 126,047
Consumer | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 92,714 | 125,973
Consumer | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total |  | 3
Consumer | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 41 |
Consumer | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 20 | 42
Consumer | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,334 | 29
Foreign |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 230,005 | 245,625
Foreign | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 229,898 | 234,979
Foreign | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total |  | 10,108
Foreign | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 61 |
Foreign | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total |  | 531
Foreign | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | $ 46 | $ 7

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- Definition Reflects the aggregate gross carrying amount of all categories of loans and leases held in portfolio, after deducting deferred income, but before deducting the allowance for losses on loans and leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6965416&loc=d3e5074-111524 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 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 8 -Paragraph 116 -IssueDate 2006-05-01 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Chapter V -Section 563c.102 -Paragraph 8 -Subparagraph e -Subsection I -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. + Details
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