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Allowance for Probable Loan Losses (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Allowance for probable loan losses    
Balance at the beginning of the period $ 84,192 $ 84,482
Losses charged to allowance (58,346) (22,899)
Recoveries credited to allowance 4,388 5,291
Net losses charged to allowance (53,958) (17,608)
Provision (credit) charged to operations 27,959 17,318
Balance at the end of the period 58,193 84,192
Commercial
    
Allowance for probable loan losses    
Balance at the beginning of the period 26,617 22,046
Losses charged to allowance (34,721) (16,130)
Recoveries credited to allowance 3,547 4,126
Net losses charged to allowance (31,174) (12,004)
Provision (credit) charged to operations 16,189 16,575
Balance at the end of the period 11,632 26,617
Commercial real estate: other construction and land development
    
Allowance for probable loan losses    
Balance at the beginning of the period 19,940 26,695
Losses charged to allowance (7,617) (1,467)
Recoveries credited to allowance 229 171
Net losses charged to allowance (7,388) (1,296)
Provision (credit) charged to operations 168 (5,459)
Balance at the end of the period 12,720 19,940
Risks related to family development loans    
Minimum number of family development loans 1  
Maximum number of family development loans 4  
Commercial real estate: farmland and commercial
    
Allowance for probable loan losses    
Balance at the beginning of the period 24,227 16,340
Losses charged to allowance (13,724) (1,955)
Recoveries credited to allowance 220 296
Net losses charged to allowance (13,504) (1,659)
Provision (credit) charged to operations 11,157 9,546
Balance at the end of the period 21,880 24,227
Commercial real estate: multifamily
    
Allowance for probable loan losses    
Balance at the beginning of the period 1,003 53
Provision (credit) charged to operations (309) 950
Balance at the end of the period 694 1,003
Residential: first lien
    
Allowance for probable loan losses    
Balance at the beginning of the period 4,562 10,059
Losses charged to allowance (227) (805)
Recoveries credited to allowance 13 28
Net losses charged to allowance (214) (777)
Provision (credit) charged to operations 42 (4,720)
Balance at the end of the period 4,390 4,562
Residential: junior lien
    
Allowance for probable loan losses    
Balance at the beginning of the period 4,760 2,611
Losses charged to allowance (1,190) (1,304)
Recoveries credited to allowance 195 300
Net losses charged to allowance (995) (1,004)
Provision (credit) charged to operations 683 3,153
Balance at the end of the period 4,448 4,760
Consumer
    
Allowance for probable loan losses    
Balance at the beginning of the period 1,724 6,241
Losses charged to allowance (756) (1,067)
Recoveries credited to allowance 184 211
Net losses charged to allowance (572) (856)
Provision (credit) charged to operations 137 (3,661)
Balance at the end of the period 1,289 1,724
Foreign
    
Allowance for probable loan losses    
Balance at the beginning of the period 1,359 437
Losses charged to allowance (111) (171)
Recoveries credited to allowance   159
Net losses charged to allowance (111) (12)
Provision (credit) charged to operations (108) 934
Balance at the end of the period $ 1,140 $ 1,359