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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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