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Allowance for Probable Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Loan portfolio by credit quality indicator |  |
Portfolio, total | $ 4,878,322 | $ 5,053,475
Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 4,498,682 | 4,496,404
Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 104,677 | 165,714
Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 55,749 | 59,349
Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 140,949 | 195,703
Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 78,265 | 136,305
Commercial |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 808,241 | 773,816
Commercial | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 691,662 | 655,154
Commercial | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 5,460 | 5,279
Commercial | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 5,522 | 6,361
Commercial | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 77,544 | 79,419
Commercial | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 28,053 | 27,603
Commercial real estate: other construction and land development |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,210,491 | 1,273,389
Commercial real estate: other construction and land development | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,131,653 | 1,058,843
Commercial real estate: other construction and land development | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 14,641 | 76,722
Commercial real estate: other construction and land development | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 5,411 | 11,083
Commercial real estate: other construction and land development | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 33,070 | 66,313
Commercial real estate: other construction and land development | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 25,716 | 60,428
Commercial real estate: farmland and commercial |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,623,053 | 1,664,687
Commercial real estate: farmland and commercial | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,453,930 | 1,449,822
Commercial real estate: farmland and commercial | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 84,131 | 83,581
Commercial real estate: farmland and commercial | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 44,381 | 40,510
Commercial real estate: farmland and commercial | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 22,283 | 48,543
Commercial real estate: farmland and commercial | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 18,328 | 42,231
Commercial real estate: multifamily |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 101,976 | 121,599
Commercial real estate: multifamily | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 101,538 | 121,188
Commercial real estate: multifamily | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 56 |
Commercial real estate: multifamily | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 382 | 411
Residential: first lien |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 462,503 | 495,722
Residential: first lien | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 452,856 | 490,924
Residential: first lien | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 366 | 132
Residential: first lien | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 33 | 974
Residential: first lien | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 6,496 | 1,402
Residential: first lien | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 2,752 | 2,290
Residential: junior lien |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 379,809 | 400,148
Residential: junior lien | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 376,000 | 397,861
Residential: junior lien | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 79 |
Residential: junior lien | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 320 | 319
Residential: junior lien | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,500 | 6
Residential: junior lien | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,910 | 1,962
Consumer |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 83,199 | 94,109
Consumer | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 82,083 | 92,714
Consumer | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 37 | 41
Consumer | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total |  | 20
Consumer | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,079 | 1,334
Foreign |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 209,050 | 230,005
Foreign | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 208,960 | 229,898
Foreign | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 45 | 61
Foreign | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | $ 45 | $ 46

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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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