Recorded Investment in Purchased Credit Impaired Loans and Allowance for Loan Losses by Loan Pool (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	$ 90,433	$ 139,362
Allowance for Acquired Impaired Loans Evaluated	1,043	8
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	37,722	76,707
Allowance for Acquired Impaired Loans Evaluated	166	8
Commercial Loans \| Waccamaw Commercial
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	22,299	40,688
Commercial Loans \| Waccamaw Lines Of Credit
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	4,077	10,009
Allowance for Acquired Impaired Loans Evaluated	158
Commercial Loans \| Peoples Commercial
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	9,331	23,670
Commercial Loans \| Commercial Loan Other
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	2,015	2,340
Allowance for Acquired Impaired Loans Evaluated	8	8
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	52,668	62,554
Allowance for Acquired Impaired Loans Evaluated	877
Consumer Real Estate \| Waccamaw Serviced Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	44,407	50,343
Allowance for Acquired Impaired Loans Evaluated	443
Consumer Real Estate \| Waccamaw Residential
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	5,631	8,974
Allowance for Acquired Impaired Loans Evaluated	270
Consumer Real Estate \| Peoples Residential
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	2,630	3,237
Allowance for Acquired Impaired Loans Evaluated	164
Consumer and Other \| Waccamaw Consumer
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	$ 43	$ 101

Recorded Investment in Purchased Credit Impaired Loans and Allowance for Loan Losses by Loan Pool (Detail) (USD $)
In Thousands, unless otherwise specified

Sep. 30, 2013

Dec. 31, 2012

Financing Receivable, Recorded Investment [Line Items]

Acquired Impaired Loans Evaluated for Impairment

$ 90,433

$ 139,362

Allowance for Acquired Impaired Loans Evaluated

1,043

Commercial Loans

Financing Receivable, Recorded Investment [Line Items]

Acquired Impaired Loans Evaluated for Impairment

37,722