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Allowance for Loan Losses on PCI Loans and Recorded Investment in Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	$ 36,555	$ 42,642
Allowance for Acquired Impaired Loans Evaluated	12	54
Commercial Loans
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	9,144	10,567
Commercial Loans | Waccamaw Commercial
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	2,676	3,788
Commercial Loans | Peoples Commercial
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	5,268	5,525
Commercial Loans | Commercial Loan Other
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	1,200	1,254
Consumer Real Estate
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	27,411	32,075
Allowance for Acquired Impaired Loans Evaluated	12	54
Consumer Real Estate | Waccamaw Serviced Home Equity Lines
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	24,828	29,241
Consumer Real Estate | Waccamaw Residential
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	1,461	1,678
Allowance for Acquired Impaired Loans Evaluated		1
Consumer Real Estate | Peoples Residential
Financing Receivable, Recorded Investment [Line Items]
Acquired Impaired Loans Evaluated for Impairment	1,122	1,156
Allowance for Acquired Impaired Loans Evaluated	$ 12	$ 53

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