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Allowance for Probable Loan Losses (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Allowance for probable loan losses        
Balance at the beginning of the period   $ 84,482,000 $ 95,393,000 $ 95,393,000
Losses charged to allowance 7,633,000 (10,490,000) (14,298,000) 719,000
Recoveries credited to allowance   2,326,000 615,000  
Net losses charged to allowance   (8,164,000) (13,683,000)  
(Credit) provision charged to operations   2,163,000 8,658,000  
Balance at the end of the period 78,481,000 78,481,000 90,368,000 84,482,000
Commercial
        
Allowance for probable loan losses        
Balance at the beginning of the period   22,046,000    
Losses charged to allowance   (6,818,000)    
Recoveries credited to allowance   1,671,000    
Net losses charged to allowance   (5,147,000)    
(Credit) provision charged to operations   3,728,000    
Balance at the end of the period 20,627,000 20,627,000    
Commercial real estate: other construction and land development
        
Allowance for probable loan losses        
Balance at the beginning of the period   26,695,000    
Losses charged to allowance   (1,218,000)    
Recoveries credited to allowance   74,000    
Net losses charged to allowance   (1,144,000)    
(Credit) provision charged to operations   (5,475,000)    
Balance at the end of the period 20,076,000 20,076,000    
Commercial real estate: farmland and commercial
        
Allowance for probable loan losses        
Balance at the beginning of the period   16,340,000    
Losses charged to allowance   (645,000)    
Recoveries credited to allowance   194,000    
Net losses charged to allowance   (451,000)    
(Credit) provision charged to operations   5,439,000    
Balance at the end of the period 21,328,000 21,328,000    
Commercial real estate: multifamily
        
Allowance for probable loan losses        
Balance at the beginning of the period   53,000    
(Credit) provision charged to operations   801,000    
Balance at the end of the period 854,000 854,000    
Residential: first lien
        
Allowance for probable loan losses        
Balance at the beginning of the period   10,059,000    
Losses charged to allowance   (659,000)    
Recoveries credited to allowance   4,000    
Net losses charged to allowance   (655,000)    
(Credit) provision charged to operations   (3,294,000)    
Balance at the end of the period 6,110,000 6,110,000    
Residential: junior lien
        
Allowance for probable loan losses        
Balance at the beginning of the period   2,611,000    
Losses charged to allowance   (566,000)    
Recoveries credited to allowance   264,000    
Net losses charged to allowance   (302,000)    
(Credit) provision charged to operations   3,224,000    
Balance at the end of the period 5,533,000 5,533,000    
Consumer
        
Allowance for probable loan losses        
Balance at the beginning of the period   6,241,000    
Losses charged to allowance   (570,000)    
Recoveries credited to allowance   118,000    
Net losses charged to allowance   (452,000)    
(Credit) provision charged to operations   (3,411,000)    
Balance at the end of the period 2,378,000 2,378,000    
Foreign
        
Allowance for probable loan losses        
Balance at the beginning of the period   437,000    
Losses charged to allowance   (13,000)    
Recoveries credited to allowance   1,000    
Net losses charged to allowance   (12,000)    
(Credit) provision charged to operations   1,150,000    
Balance at the end of the period $ 1,575,000 $ 1,575,000