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Allowance for Loan Losses on PCI Loans and Recorded Investment in Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | $ 31,796 | $ 42,642
Allowance for Acquired Impaired Loans Evaluated | 12 | 54
Commercial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 7,023 | 10,567
Commercial Loans | Waccamaw Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 1,208 | 3,788
Commercial Loans | Peoples Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 4,694 | 5,525
Commercial Loans | Commercial Loan Other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 1,121 | 1,254
Consumer Real Estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 24,773 | 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 | 22,256 | 29,241
Consumer Real Estate | Waccamaw Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 1,413 | 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 | 1,104 | 1,156
Allowance for Acquired Impaired Loans Evaluated | $ 12 | $ 53

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