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Allowance for Probable Loan Losses (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
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