Carrying and Contractual Unpaid Principal Balance of PCI loans, by Acquisition (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid Principal Balance	$ 16,915	$ 22,835
PCI loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Balance	36,555	42,642
Unpaid Principal Balance	65,437	75,697
Peoples | PCI loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Balance	6,390	6,681
Unpaid Principal Balance	10,496	11,249
Waccamaw Bank | PCI loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Balance	28,965	34,707
Unpaid Principal Balance	53,698	63,151
Other | PCI loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying Balance	1,200	1,254
Unpaid Principal Balance	$ 1,243	$ 1,297