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Allowance for Loan Losses Related to PCI Loans and Recorded Investment in Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Acquired Impaired Loans Evaluated for Impairment |  | $ 55,065 | $ 62,283
Allowance for Acquired Impaired Loans Evaluated |  | 114 | 58
Commercial Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Acquired Impaired Loans Evaluated for Impairment |  | 18,237 | 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 |  | 11,873 | 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 |  | 201 | 461
Commercial Loans | Peoples Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Acquired Impaired Loans Evaluated for Impairment |  | 4,856 | 5,875
Commercial Loans | Commercial Loan Other |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Acquired Impaired Loans Evaluated for Impairment |  | 1,307 | 1,358
Consumer Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Acquired Impaired Loans Evaluated for Impairment |  | 36,828 | 41,195
Allowance for Acquired Impaired Loans Evaluated |  | 114 | 21
Consumer Real Estate | Waccamaw Serviced Home Equity Lines |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Acquired Impaired Loans Evaluated for Impairment |  | 33,703 | 37,342
Consumer Real Estate | Waccamaw Residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Acquired Impaired Loans Evaluated for Impairment |  | 1,933 | 2,638
Allowance for Acquired Impaired Loans Evaluated |  | 94 |
Consumer Real Estate | Peoples Residential |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Acquired Impaired Loans Evaluated for Impairment |  | 1,192 | 1,215
Allowance for Acquired Impaired Loans Evaluated |  | $ 20 | 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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