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Allowance for Probable Loan Losses (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for probable loan losses      
Balance at the beginning of the period $ 58,193,000 $ 84,192,000  
Losses charged to allowance (14,455,000) (58,346,000)  
Recoveries credited to allowance 3,455,000 4,388,000  
Net losses charged to allowance (11,000,000) (53,958,000)  
Provision (credit) charged to operations 22,968,000 27,959,000 17,318,000
Balance at the end of the period 70,161,000 58,193,000 84,192,000
Commercial
      
Allowance for probable loan losses      
Balance at the beginning of the period 11,632,000 26,617,000  
Losses charged to allowance (11,737,000) (34,721,000)  
Recoveries credited to allowance 2,690,000 3,547,000  
Net losses charged to allowance (9,047,000) (31,174,000)  
Provision (credit) charged to operations 19,848,000 16,189,000  
Balance at the end of the period 22,433,000 11,632,000  
Risks related to family development loans      
Increase in allowance for probable loan losses due to the addition of a specific reserve 12,000,000    
Commercial real estate: other construction and land development
      
Allowance for probable loan losses      
Balance at the beginning of the period 12,720,000 19,940,000  
Losses charged to allowance (278,000) (7,617,000)  
Recoveries credited to allowance 87,000 229,000  
Net losses charged to allowance (191,000) (7,388,000)  
Provision (credit) charged to operations 12,000 168,000  
Balance at the end of the period 12,541,000 12,720,000  
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 21,880,000 24,227,000  
Losses charged to allowance (600,000) (13,724,000)  
Recoveries credited to allowance 152,000 220,000  
Net losses charged to allowance (448,000) (13,504,000)  
Provision (credit) charged to operations 3,035,000 11,157,000  
Balance at the end of the period 24,467,000 21,880,000  
Commercial real estate: multifamily
      
Allowance for probable loan losses      
Balance at the beginning of the period 694,000 1,003,000  
Losses charged to allowance (5,000)    
Net losses charged to allowance (5,000)    
Provision (credit) charged to operations 87,000 (309,000)  
Balance at the end of the period 776,000 694,000  
Residential: first lien
      
Allowance for probable loan losses      
Balance at the beginning of the period 4,390,000 4,562,000  
Losses charged to allowance (632,000) (227,000)  
Recoveries credited to allowance 61,000 13,000  
Net losses charged to allowance (571,000) (214,000)  
Provision (credit) charged to operations (7,000) 42,000  
Balance at the end of the period 3,812,000 4,390,000  
Residential: junior lien
      
Allowance for probable loan losses      
Balance at the beginning of the period 4,448,000 4,760,000  
Losses charged to allowance (620,000) (1,190,000)  
Recoveries credited to allowance 298,000 195,000  
Net losses charged to allowance (322,000) (995,000)  
Provision (credit) charged to operations 123,000 683,000  
Balance at the end of the period 4,249,000 4,448,000  
Consumer
      
Allowance for probable loan losses      
Balance at the beginning of the period 1,289,000 1,724,000  
Losses charged to allowance (561,000) (756,000)  
Recoveries credited to allowance 162,000 184,000  
Net losses charged to allowance (399,000) (572,000)  
Provision (credit) charged to operations (140,000) 137,000  
Balance at the end of the period 750,000 1,289,000  
Foreign
      
Allowance for probable loan losses      
Balance at the beginning of the period 1,140,000 1,359,000  
Losses charged to allowance (22,000) (111,000)  
Recoveries credited to allowance 5,000    
Net losses charged to allowance (17,000) (111,000)  
Provision (credit) charged to operations 10,000 (108,000)  
Balance at the end of the period $ 1,133,000 $ 1,140,000  
Commercial real estate relationships
      
Risks related to family development loans      
Number of relationships charged off 4