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Allowance for Probable Loan Losses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Allowance for probable loan losses        
Balance at the beginning of the period $ 62,968 $ 78,781 $ 58,193 $ 84,192
Losses charged to allowance (3,056) (15,669) (6,565) (27,753)
Recoveries credited to allowance 797 1,159 1,662 2,547
Net losses charged to allowance (2,259) (14,510) (4,903) (25,206)
Provision (credit) charged to operations 4,342 6,107 11,761 11,392
Balance at the end of the period 65,051 70,378 65,051 70,378
Commercial
        
Allowance for probable loan losses        
Balance at the beginning of the period 20,926 24,577 11,632 26,617
Losses charged to allowance (2,663) (3,064) (5,326) (6,488)
Recoveries credited to allowance 557 758 1,251 2,002
Net losses charged to allowance (2,106) (2,306) (4,075) (4,486)
Provision (credit) charged to operations 1,856 2,417 13,119 2,557
Balance at the end of the period 20,676 24,688 20,676 24,688
Commercial real estate: other construction and land development
        
Allowance for probable loan losses        
Balance at the beginning of the period 11,053 19,766 12,720 19,940
Losses charged to allowance (120) (7,500) (248) (7,571)
Recoveries credited to allowance 13 207 26 212
Net losses charged to allowance (107) (7,293) (222) (7,359)
Provision (credit) charged to operations 678 769 (874) 661
Balance at the end of the period 11,624 13,242 11,624 13,242
Commercial real estate: farmland and commercial
        
Allowance for probable loan losses        
Balance at the beginning of the period 20,651 21,810 21,880 24,227
Losses charged to allowance (1) (4,482) (61) (12,476)
Recoveries credited to allowance 128 100 141 131
Net losses charged to allowance 127 (4,382) 80 (12,345)
Provision (credit) charged to operations 1,605 3,123 423 8,669
Balance at the end of the period 22,383 20,551 22,383 20,551
Commercial real estate: multifamily
        
Allowance for probable loan losses        
Balance at the beginning of the period 609 849 694 1,003
Provision (credit) charged to operations 14 (46) (71) (200)
Balance at the end of the period 623 803 623 803
Residential: first lien
        
Allowance for probable loan losses        
Balance at the beginning of the period 3,868 4,379 4,390 4,562
Losses charged to allowance (27) (30) (199) (66)
Recoveries credited to allowance 4 1 9 3
Net losses charged to allowance (23) (29) (190) (63)
Provision (credit) charged to operations 10 (363) (345) (512)
Balance at the end of the period 3,855 3,987 3,855 3,987
Residential: junior lien
        
Allowance for probable loan losses        
Balance at the beginning of the period 4,011 4,505 4,448 4,760
Losses charged to allowance (140) (399) (395) (711)
Recoveries credited to allowance 30 61 124 106
Net losses charged to allowance (110) (338) (271) (605)
Provision (credit) charged to operations 146 243 (130) 255
Balance at the end of the period 4,047 4,410 4,047 4,410
Consumer
        
Allowance for probable loan losses        
Balance at the beginning of the period 820 1,602 1,289 1,724
Losses charged to allowance (105) (189) (316) (436)
Recoveries credited to allowance 60 32 106 93
Net losses charged to allowance (45) (157) (210) (343)
Provision (credit) charged to operations 22 31 (282) 95
Balance at the end of the period 797 1,476 797 1,476
Foreign
        
Allowance for probable loan losses        
Balance at the beginning of the period 1,030 1,293 1,140 1,359
Losses charged to allowance   (5) (20) (5)
Recoveries credited to allowance 5   5  
Net losses charged to allowance 5 (5) (15) (5)
Provision (credit) charged to operations 11 (67) (79) (133)
Balance at the end of the period $ 1,046 $ 1,221 $ 1,046 $ 1,221