Carrying and Contractual Unpaid Principal Balance of PCI loans, by Acquisition (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal, ending balance	$ 29,900	$ 25,816
PCI loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value, beginning balance	76,894	81,711	120,616	141,340
Carrying value, ending balance	76,894	81,711	120,616	141,340
Unpaid principal, ending balance	121,792		168,871
Peoples | PCI loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value, beginning balance	9,196	9,196	21,715	26,907
Carrying value, ending balance	9,196	9,196	21,715	26,907
Unpaid principal, ending balance	16,825		28,821
Waccamaw Bank | PCI loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value, beginning balance	65,780	70,584	96,537	112,093
Carrying value, ending balance	65,780	70,584	96,537	112,093
Unpaid principal, ending balance	99,582		134,158
Other | PCI loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Carrying value, beginning balance	1,918	1,931	2,364	2,340
Carrying value, ending balance	1,918	1,931	2,364	2,340
Unpaid principal, ending balance	$ 5,385		$ 5,892