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Allowance for Probable Loan Losses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Allowance for probable loan losses        
Balance at the beginning of the period $ 70,408 $ 62,968 $ 70,161 $ 58,193
Losses charged to allowance (3,327) (3,056) (6,171) (6,565)
Recoveries credited to allowance 811 797 1,824 1,662
Net (losses) gains charged to allowance (2,516) (2,259) (4,347) (4,903)
Provision charged to operations 3,645 4,342 5,723 11,761
Balance at the end of the period 71,537 65,051 71,537 65,051
Commercial Loan [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 27,923 20,926 22,433 11,632
Losses charged to allowance (2,379) (2,663) (4,860) (5,326)
Recoveries credited to allowance 620 557 1,416 1,251
Net (losses) gains charged to allowance (1,759) (2,106) (3,444) (4,075)
Provision charged to operations 1,842 1,856 9,017 13,119
Balance at the end of the period 28,006 20,676 28,006 20,676
Commercial Real Estate Other Construction And Land Development Receivable [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 13,475 11,053 12,541 12,720
Losses charged to allowance (399) (120) (399) (248)
Recoveries credited to allowance 21 13 52 26
Net (losses) gains charged to allowance (378) (107) (347) (222)
Provision charged to operations (91) 678 812 (874)
Balance at the end of the period 13,006 11,624 13,006 11,624
Commercial Real Estate Farmland And Commercial Receivable [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 18,934 20,651 24,467 21,880
Losses charged to allowance (170) (1) (170) (61)
Recoveries credited to allowance 35 128 58 141
Net (losses) gains charged to allowance (135) 127 (112) 80
Provision charged to operations 739 1,605 (4,817) 423
Balance at the end of the period 19,538 22,383 19,538 22,383
Commercial Real Estate Multifamily Receivable [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 819 609 776 694
Provision charged to operations (33) 14 10 (71)
Balance at the end of the period 786 623 786 623
Residential First Mortgage Financing Receivable [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 3,524 3,868 3,812 4,390
Losses charged to allowance (103) (27) (130) (199)
Recoveries credited to allowance 1 4 5 9
Net (losses) gains charged to allowance (102) (23) (125) (190)
Provision charged to operations 299 10 34 (345)
Balance at the end of the period 3,721 3,855 3,721 3,855
Residential Second Mortgage Financing Receivable [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 3,968 4,011 4,249 4,448
Losses charged to allowance (7) (140) (153) (395)
Recoveries credited to allowance 67 30 100 124
Net (losses) gains charged to allowance 60 (110) (53) (271)
Provision charged to operations 708 146 540 (130)
Balance at the end of the period 4,736 4,047 4,736 4,047
Consumer Loan [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 748 820 750 1,289
Losses charged to allowance (222) (105) (409) (316)
Recoveries credited to allowance 67 60 147 106
Net (losses) gains charged to allowance (155) (45) (262) (210)
Provision charged to operations 113 22 218 (282)
Balance at the end of the period 706 797 706 797
Foreign Receivables [Member]
        
Allowance for probable loan losses        
Balance at the beginning of the period 1,017 1,030 1,133 1,140
Losses charged to allowance (47)   (50) (20)
Recoveries credited to allowance   5 46 5
Net (losses) gains charged to allowance (47) 5 (4) (15)
Provision charged to operations 68 11 (91) (79)
Balance at the end of the period $ 1,038 $ 1,046 $ 1,038 $ 1,046