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Allowance for Probable Loan Losses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Allowance for probable loan losses        
Balance at the beginning of the period $ 71,537 $ 65,051 $ 70,161 $ 58,193
Losses charged to allowance (3,520) (3,845) (9,691) (10,410)
Recoveries credited to allowance 894 823 2,718 2,485
Net (losses) gains charged to allowance (2,626) (3,022) (6,973) (7,925)
Provision charged to operations 2,816 5,800 8,539 17,561
Balance at the end of the period 71,727 67,829 71,727 67,829
Commercial Loan [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 28,006 20,676 22,433 11,632
Losses charged to allowance (2,920) (3,540) (7,780) (8,866)
Recoveries credited to allowance 740 658 2,156 1,909
Net (losses) gains charged to allowance (2,180) (2,882) (5,624) (6,957)
Provision charged to operations 2,454 3,370 11,471 16,489
Balance at the end of the period 28,280 21,164 28,280 21,164
Commercial Real Estate Other Construction and Land Development Receivable [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 13,006 11,624 12,541 12,720
Losses charged to allowance (43) (2) (442) (250)
Recoveries credited to allowance 14 10 66 36
Net (losses) gains charged to allowance (29) 8 (376) (214)
Provision charged to operations 852 (10) 1,664 (884)
Balance at the end of the period 13,829 11,622 13,829 11,622
Commercial Real Estate Farmland and Commercial Receivable [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 19,538 22,383 24,467 21,880
Losses charged to allowance (38)   (208) (61)
Recoveries credited to allowance 42 9 100 150
Net (losses) gains charged to allowance 4 9 (108) 89
Provision charged to operations (701) 1,549 (5,518) 1,972
Balance at the end of the period 18,841 23,941 18,841 23,941
Commercial Real Estate Multifamily Receivable [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 786 623 776 694
Provision charged to operations (41) 112 (31) 41
Balance at the end of the period 745 735 745 735
Residential First Mortgage Financing Receivable [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 3,721 3,855 3,812 4,390
Losses charged to allowance (131) (22) (261) (221)
Recoveries credited to allowance 11 45 16 54
Net (losses) gains charged to allowance (120) 23 (245) (167)
Provision charged to operations 27 186 61 (159)
Balance at the end of the period 3,628 4,064 3,628 4,064
Residential Second Mortgage Financing Receivable [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 4,736 4,047 4,249 4,448
Losses charged to allowance (242) (149) (395) (544)
Recoveries credited to allowance 40 80 140 204
Net (losses) gains charged to allowance (202) (69) (255) (340)
Provision charged to operations 164 404 704 274
Balance at the end of the period 4,698 4,382 4,698 4,382
Consumer Loan [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 706 797 750 1,289
Losses charged to allowance (146) (130) (555) (446)
Recoveries credited to allowance 47 21 194 127
Net (losses) gains charged to allowance (99) (109) (361) (319)
Provision charged to operations 79 124 297 (158)
Balance at the end of the period 686 812 686 812
Foreign Receivables [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 1,038 1,046 1,133 1,140
Losses charged to allowance   (2) (50) (22)
Recoveries credited to allowance     46 5
Net (losses) gains charged to allowance   (2) (4) (17)
Provision charged to operations (18) 65 (109) (14)
Balance at the end of the period $ 1,020 $ 1,109 $ 1,020 $ 1,109