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Allowance for Probable Loan Losses (Details 2) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | $ 79,473 | $ 83,005
Loans individually evaluated for impairment, Allowance | 15,011 | 4,746
Loans collectively evaluated for impairment, Recorded Investment | 4,747,036 | 4,691,999
Loans collectively evaluated for impairment, Allowance | 47,957 | 53,447
Commercial |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 33,108 | 32,768
Loans individually evaluated for impairment, Allowance | 11,544 | 1,477
Loans collectively evaluated for impairment, Recorded Investment | 835,849 | 736,342
Loans collectively evaluated for impairment, Allowance | 9,382 | 10,155
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 | 26,172 | 28,660
Loans individually evaluated for impairment, Allowance | 823 | 539
Loans collectively evaluated for impairment, Recorded Investment | 1,059,334 | 1,119,009
Loans collectively evaluated for impairment, Allowance | 10,230 | 12,181
Commercial real estate: farmland and commercial |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 11,900 | 13,945
Loans individually evaluated for impairment, Allowance | 2,644 | 2,730
Loans collectively evaluated for impairment, Recorded Investment | 1,697,537 | 1,659,377
Loans collectively evaluated for impairment, Allowance | 18,007 | 19,150
Commercial real estate: multifamily |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 338 | 353
Loans collectively evaluated for impairment, Recorded Investment | 78,516 | 82,595
Loans collectively evaluated for impairment, Allowance | 609 | 694
Residential: first lien |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 4,546 | 3,656
Loans collectively evaluated for impairment, Recorded Investment | 445,845 | 453,075
Loans collectively evaluated for impairment, Allowance | 3,868 | 4,390
Residential: junior lien |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 1,702 | 1,850
Loans collectively evaluated for impairment, Recorded Investment | 376,995 | 379,886
Loans collectively evaluated for impairment, Allowance | 4,011 | 4,448
Consumer |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 1,245 | 1,326
Loans collectively evaluated for impairment, Recorded Investment | 68,785 | 73,188
Loans collectively evaluated for impairment, Allowance | 820 | 1,289
Foreign |  |
Loan loss allowances, impaired financing receivable, evaluated individually or collectively |  |
Loans individually evaluated for impairment, Recorded Investment | 462 | 447
Loans collectively evaluated for impairment, Recorded Investment | 184,175 | 188,527
Loans collectively evaluated for impairment, Allowance | $ 1,030 | $ 1,140

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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 Amount of valuation allowance for financing receivables that are expected to be uncollectible 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 (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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