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Allowance for Probable Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | $ 85,424 | $ 136,305
Loans individually evaluated for impairment, Allowance | 17,791 | 27,252
Loans collectively evaluated for impairment, Recorded Investment | 4,797,604 | 4,917,170
Loans collectively evaluated for impairment, Allowance | 54,890 | 56,940
Commercial |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 23,516 | 27,603
Loans individually evaluated for impairment, Allowance | 13,966 | 14,402
Loans collectively evaluated for impairment, Recorded Investment | 793,200 | 746,213
Loans collectively evaluated for impairment, Allowance | 11,334 | 12,215
Commercial real estate: other construction and land development |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 33,949 | 60,428
Loans individually evaluated for impairment, Allowance | 568 | 3,073
Loans collectively evaluated for impairment, Recorded Investment | 1,158,324 | 1,212,961
Loans collectively evaluated for impairment, Allowance | 12,728 | 16,867
Commercial real estate: farmland and commercial |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 20,882 | 42,231
Loans individually evaluated for impairment, Allowance | 3,234 | 9,754
Loans collectively evaluated for impairment, Recorded Investment | 1,650,049 | 1,622,456
Loans collectively evaluated for impairment, Allowance | 18,486 | 14,473
Commercial real estate: multifamily |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 368 | 411
Loans collectively evaluated for impairment, Recorded Investment | 97,165 | 121,188
Loans collectively evaluated for impairment, Allowance | 776 | 1,003
Residential: first lien |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 3,487 | 2,290
Loans individually evaluated for impairment, Allowance | 23 | 23
Loans collectively evaluated for impairment, Recorded Investment | 447,821 | 493,432
Loans collectively evaluated for impairment, Allowance | 4,177 | 4,539
Residential: junior lien |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 1,857 | 1,962
Loans collectively evaluated for impairment, Recorded Investment | 379,974 | 398,186
Loans collectively evaluated for impairment, Allowance | 4,816 | 4,760
Consumer |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 1,273 | 1,334
Loans collectively evaluated for impairment, Recorded Investment | 78,181 | 92,775
Loans collectively evaluated for impairment, Allowance | 1,406 | 1,724
Foreign |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 92 | 46
Loans collectively evaluated for impairment, Recorded Investment | 192,890 | 229,959
Loans collectively evaluated for impairment, Allowance | $ 1,167 | $ 1,359

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References No definition available. + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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