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Acquired Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Acquired Impaired Loans        
Balance, January 1 $ 109,677 $ 139,362 $ 148,245 $ 2,886
Balance, June 30 109,677 139,362 148,245 2,886
Peoples
        
Acquired Impaired Loans        
Balance, January 1 17,484 26,907 33,454  
Balance, June 30 17,484 26,907 33,454  
Waccamaw Bank
        
Acquired Impaired Loans        
Balance, January 1 90,105 110,115 112,498  
Balance, June 30 90,105 110,115 112,498  
Other
        
Acquired Impaired Loans        
Balance, January 1 2,088 2,340 2,293 2,886
Balance, June 30 $ 2,088 $ 2,340 $ 2,293 $ 2,886