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Allowance for Loan Losses Related to PCI Loans and Recorded Investment in Loans (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		$ 42,642	$ 62,283
Allowance for Acquired Impaired Loans Evaluated		54	58
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		10,567	21,086
Allowance for Acquired Impaired Loans Evaluated			37
Commercial Loans | Waccamaw Commercial
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		3,788	13,392
Allowance for Acquired Impaired Loans Evaluated			37
Commercial Loans | Waccamaw Lines Of Credit
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment			461
Commercial Loans | Peoples Commercial
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		5,525	5,875
Commercial Loans | Commercial Loan Other
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		1,254	1,358
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		32,075	41,195
Allowance for Acquired Impaired Loans Evaluated		54	21
Consumer Real Estate | Waccamaw Serviced Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		29,241	37,342
Consumer Real Estate | Waccamaw Residential
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		1,678	2,638
Allowance for Acquired Impaired Loans Evaluated		1
Consumer Real Estate | Peoples Residential
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		1,156	1,215
Allowance for Acquired Impaired Loans Evaluated		$ 53	21
Consumer and Other | Waccamaw Consumer
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	[1]		$ 2
[1] Closed during the first quarter of 2015.

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