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Allowance for Probable Loan Losses (Details 6) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Loan portfolio by credit quality indicator |  |
Portfolio, total | $ 4,826,509 | $ 4,775,004
Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 4,470,205 | 4,369,031
Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 125,815 | 169,097
Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 51,638 | 65,855
Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 99,378 | 88,016
Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 79,473 | 83,005
Commercial |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 868,957 | 769,110
Commercial | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 775,851 | 675,263
Commercial | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 3,986 | 4,278
Commercial | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 15,888 | 16,535
Commercial | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 40,124 | 40,266
Commercial | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 33,108 | 32,768
Commercial real estate: other construction and land development |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,085,506 | 1,147,669
Commercial real estate: other construction and land development | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 992,504 | 1,038,749
Commercial real estate: other construction and land development | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 34,790 | 55,079
Commercial real estate: other construction and land development | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 2,901 | 2,614
Commercial real estate: other construction and land development | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 29,139 | 22,567
Commercial real estate: other construction and land development | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 26,172 | 28,660
Commercial real estate: farmland and commercial |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,709,437 | 1,673,322
Commercial real estate: farmland and commercial | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,555,921 | 1,486,572
Commercial real estate: farmland and commercial | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 86,445 | 109,144
Commercial real estate: farmland and commercial | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 32,798 | 46,316
Commercial real estate: farmland and commercial | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 22,373 | 17,345
Commercial real estate: farmland and commercial | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 11,900 | 13,945
Commercial real estate: multifamily |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 78,854 | 82,948
Commercial real estate: multifamily | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 78,465 | 82,542
Commercial real estate: multifamily | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 51 | 53
Commercial real estate: multifamily | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 338 | 353
Residential: first lien |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 450,391 | 456,731
Residential: first lien | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 439,754 | 446,218
Residential: first lien | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 517 | 519
Residential: first lien | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 5,574 | 6,338
Residential: first lien | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 4,546 | 3,656
Residential: junior lien |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 378,697 | 381,736
Residential: junior lien | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 375,111 | 378,000
Residential: junior lien | Special Review |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 77 | 77
Residential: junior lien | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total |  | 309
Residential: junior lien | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,807 | 1,500
Residential: junior lien | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,702 | 1,850
Consumer |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 70,030 | 74,514
Consumer | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 68,785 | 73,188
Consumer | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 1,245 | 1,326
Foreign |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 184,637 | 188,974
Foreign | Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 183,814 | 188,499
Foreign | Watch List - Pass |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total |  | 28
Foreign | Watch List - Substandard |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | 361 |
Foreign | Watch List - Impaired |  |
Loan portfolio by credit quality indicator |  |
Portfolio, total | $ 462 | $ 447

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 8 -Subparagraph e -Chapter V -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 116 -IssueDate 2006-05-01 -Chapter 8 -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 3: 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=7512638&loc=d3e5074-111524 Reference 4: 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 5: 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. + Details
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