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Allowance for Loan Losses Related to PCI Loans and Recorded Investment in Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | $ 40,844 | $ 42,642
Allowance for Acquired Impaired Loans Evaluated | 24 | 54
Commercial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 10,693 | 10,567
Commercial Loans | Waccamaw Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 3,732 | 3,788
Commercial Loans | Peoples Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 5,734 | 5,525
Commercial Loans | Commercial Loan Other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 1,227 | 1,254
Consumer Real Estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 30,151 | 32,075
Allowance for Acquired Impaired Loans Evaluated | 24 | 54
Consumer Real Estate | Waccamaw Serviced Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 27,404 | 29,241
Consumer Real Estate | Waccamaw Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 1,609 | 1,678
Allowance for Acquired Impaired Loans Evaluated | 12 | 1
Consumer Real Estate | Peoples Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 1,138 | 1,156
Allowance for Acquired Impaired Loans Evaluated | $ 12 | $ 53

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