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Allowance for Loan Losses and Recorded Investment in PCI Loans, by Loan Pool (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	$ 65,405	$ 81,711
Allowance for Acquired Impaired Loans Evaluated	204	755
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	22,132	32,238
Allowance for Acquired Impaired Loans Evaluated	8	77
Commercial Loans | Waccamaw Commercial
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	13,695	19,851
Commercial Loans | Waccamaw Lines Of Credit
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	820	2,594
Allowance for Acquired Impaired Loans Evaluated		69
Commercial Loans | Peoples Commercial
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	6,224	7,862
Commercial Loans | Commercial Loan Other
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	1,393	1,931
Allowance for Acquired Impaired Loans Evaluated	8	8
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	43,267	49,439
Allowance for Acquired Impaired Loans Evaluated	196	678
Consumer Real Estate | Waccamaw Serviced Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	39,206	43,608
Allowance for Acquired Impaired Loans Evaluated		277
Consumer Real Estate | Waccamaw Residential
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	2,853	4,497
Allowance for Acquired Impaired Loans Evaluated		217
Consumer Real Estate | Peoples Residential
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	1,208	1,334
Allowance for Acquired Impaired Loans Evaluated	196	184
Consumer and Other | Waccamaw Consumer
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	$ 6	$ 34

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