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Loans (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Summary of loans, by loan type    
Total loans $ 4,775,004 $ 5,053,475
Commercial, financial and agricultural
   
Summary of loans, by loan type    
Total loans 2,525,380 2,560,102
Real estate - mortgage
   
Summary of loans, by loan type    
Total loans 838,467 895,870
Real estate - construction
   
Summary of loans, by loan type    
Total loans 1,147,669 1,273,389
Consumer
   
Summary of loans, by loan type    
Total loans 74,514 94,109
Foreign
   
Summary of loans, by loan type    
Total loans $ 188,974 $ 230,005