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Acquired Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Acquired Impaired Loans        
Balance, January 1 $ 90,433 $ 139,362 $ 148,337 $ 2,886
Balance, September 30 90,433 139,362 148,337 2,886
Peoples
        
Acquired Impaired Loans        
Balance, January 1 11,961 26,907 30,898  
Balance, September 30 11,961 26,907 30,898  
Waccamaw Bank
        
Acquired Impaired Loans        
Balance, January 1 76,457 110,115 115,125  
Balance, September 30 76,457 110,115 115,125  
Other
        
Acquired Impaired Loans        
Balance, January 1 2,015 2,340 2,314 2,886
Balance, September 30 $ 2,015 $ 2,340 $ 2,314 $ 2,886