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Carrying and Contractual Unpaid Principal Balance of PCI loans, by Acquisition (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Unpaid principal, ending balance $ 25,317 $ 25,816    
PCI loans
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Carrying value, beginning balance 68,827 81,711 109,677 141,340
Carrying value, ending balance 68,827 81,711 109,677 141,340
Unpaid principal, ending balance 112,923   155,041  
Peoples | PCI loans
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Carrying value, beginning balance 7,862 9,196 17,484 26,907
Carrying value, ending balance 7,862 9,196 17,484 26,907
Unpaid principal, ending balance 15,216   24,882  
Waccamaw Bank | PCI loans
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Carrying value, beginning balance 59,062 70,584 90,105 112,093
Carrying value, ending balance 59,062 70,584 90,105 112,093
Unpaid principal, ending balance 92,368   124,568  
Other | PCI loans
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Carrying value, beginning balance 1,903 1,931 2,088 2,340
Carrying value, ending balance 1,903 1,931 2,088 2,340
Unpaid principal, ending balance $ 5,339   $ 5,591