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Allowance for Loan Losses and Recorded Investment in PCI Loans, by Loan Pool (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | $ 65,405 | $ 81,711
Allowance for Acquired Impaired Loans Evaluated | 204 | 755
Commercial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 22,132 | 32,238
Allowance for Acquired Impaired Loans Evaluated | 8 | 77
Commercial Loans | Waccamaw Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 13,695 | 19,851
Commercial Loans | Waccamaw Lines Of Credit |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 820 | 2,594
Allowance for Acquired Impaired Loans Evaluated |  | 69
Commercial Loans | Peoples Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 6,224 | 7,862
Commercial Loans | Commercial Loan Other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 1,393 | 1,931
Allowance for Acquired Impaired Loans Evaluated | 8 | 8
Consumer Real Estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 43,267 | 49,439
Allowance for Acquired Impaired Loans Evaluated | 196 | 678
Consumer Real Estate | Waccamaw Serviced Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 39,206 | 43,608
Allowance for Acquired Impaired Loans Evaluated |  | 277
Consumer Real Estate | Waccamaw Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 2,853 | 4,497
Allowance for Acquired Impaired Loans Evaluated |  | 217
Consumer Real Estate | Peoples Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 1,208 | 1,334
Allowance for Acquired Impaired Loans Evaluated | 196 | 184
Consumer and Other | Waccamaw Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | $ 6 | $ 34

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