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Acquired Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
Acquired Impaired Loans        
Balance, January 1 $ 120,616 $ 139,362 $ 2,388 $ 2,886
Balance, March 31 120,616 139,362 2,388 2,886
Peoples
       
Acquired Impaired Loans        
Balance, January 1 21,715 26,907    
Balance, March 31 21,715 26,907    
Waccamaw Bank
       
Acquired Impaired Loans        
Balance, January 1 96,537 110,115    
Balance, March 31 96,537 110,115    
Other
       
Acquired Impaired Loans        
Balance, January 1 2,364 2,340 2,388 2,886
Balance, March 31 $ 2,364 $ 2,340 $ 2,388 $ 2,886