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Carrying and Contractual Unpaid Principal Balance of PCI loans, by Acquisition (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid principal, ending balance $ 23,241 $ 25,816  
PCI loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value, beginning balance 65,405 81,711 141,340
Carrying value, ending balance 65,405 81,711 141,340
Unpaid principal, ending balance 108,351 128,498  
Peoples | PCI loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value, beginning balance 7,432 9,196 26,907
Carrying value, ending balance 7,432 9,196 26,907
Unpaid principal, ending balance 14,142 17,431  
Waccamaw Bank | PCI loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value, beginning balance 56,580 70,584 112,093
Carrying value, ending balance 56,580 70,584 112,093
Unpaid principal, ending balance 89,385 105,677  
Other | PCI loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying value, beginning balance 1,393 1,931 2,340
Carrying value, ending balance 1,393 1,931 2,340
Unpaid principal, ending balance $ 4,824 $ 5,390