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Allowance for Loan Losses Related to PCI Loans and Recorded Investment in Loans (Detail) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		$ 46,239	$ 62,283
Allowance for Acquired Impaired Loans Evaluated		20	58
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		11,963	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		5,580	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		5,102	5,875
Commercial Loans | Commercial Loan Other
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		1,281	1,358
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		34,276	41,195
Allowance for Acquired Impaired Loans Evaluated		20	21
Consumer Real Estate | Waccamaw Serviced Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		31,261	37,342
Consumer Real Estate | Waccamaw Residential
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment		1,840	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		1,175	1,215
Allowance for Acquired Impaired Loans Evaluated		$ 19	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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