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Allowance for Probable Loan Losses (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment $ 136,305 $ 125,200
Loans individually evaluated for impairment, Allowance 27,252 12,171
Loans collectively evaluated for impairment, Recorded Investment 4,917,170 5,284,803
Loans collectively evaluated for impairment, Allowance 56,940 72,311
Commercial
    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 27,603 23,426
Loans individually evaluated for impairment, Allowance 14,402 8,138
Loans collectively evaluated for impairment, Recorded Investment 746,213 807,098
Loans collectively evaluated for impairment, Allowance 12,215 13,908
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 60,428 77,207
Loans individually evaluated for impairment, Allowance 3,073 592
Loans collectively evaluated for impairment, Recorded Investment 1,212,961 1,396,264
Loans collectively evaluated for impairment, Allowance 16,867 26,103
Commercial real estate: farmland and commercial
    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 42,231 21,844
Loans individually evaluated for impairment, Allowance 9,754 3,441
Loans collectively evaluated for impairment, Recorded Investment 1,622,456 1,666,719
Loans collectively evaluated for impairment, Allowance 14,473 12,899
Commercial real estate: multifamily
    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 411 473
Loans collectively evaluated for impairment, Recorded Investment 121,188 96,318
Loans collectively evaluated for impairment, Allowance 1,003 53
Residential: first lien
    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 2,290 2,015
Loans individually evaluated for impairment, Allowance 23  
Loans collectively evaluated for impairment, Recorded Investment 493,432 531,440
Loans collectively evaluated for impairment, Allowance 4,539 10,059
Residential: junior lien
    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 1,962 199
Loans collectively evaluated for impairment, Recorded Investment 398,186 415,328
Loans collectively evaluated for impairment, Allowance 4,760 2,611
Consumer
    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 1,334 29
Loans collectively evaluated for impairment, Recorded Investment 92,775 126,018
Loans collectively evaluated for impairment, Allowance 1,724 6,241
Foreign
    
Loan loss allowances, impaired financing receivable, evaluated individually or collectively    
Loans individually evaluated for impairment, Recorded Investment 46 7
Loans collectively evaluated for impairment, Recorded Investment 229,959 245,618
Loans collectively evaluated for impairment, Allowance $ 1,359 $ 437