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Carrying and Contractual Unpaid Principal Balance of PCI loans, by Acquisition (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Unpaid principal ending balance $ 29,356 $ 25,816    
PCI loans
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Carrying value,beginning balance 2,886 81,711   3,221
Impaired loans acquired 150,175      
Carrying value,ending balance 141,340 81,711   3,221
Unpaid principal ending balance 198,343 128,498 6,824  
Peoples | PCI loans
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Carrying value,beginning balance   9,196    
Impaired loans acquired 32,603      
Carrying value,ending balance 26,907 9,196    
Unpaid principal ending balance 34,644 17,431    
Waccamaw Bank | PCI loans
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Carrying value,beginning balance   70,584    
Impaired loans acquired 117,572      
Carrying value,ending balance 112,093 70,584    
Unpaid principal ending balance 157,781 105,677    
Other | PCI loans
        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Carrying value,beginning balance   1,931 2,886 3,221
Carrying value,ending balance 2,340 1,931 2,886 3,221
Unpaid principal ending balance $ 5,918 $ 5,390 $ 6,824