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Recorded Investment in Purchased Credit Impaired Loans and Allowance for Loan Losses by Loan Pool (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | $ 90,433 | $ 139,362
Allowance for Acquired Impaired Loans Evaluated | 1,043 | 8
Commercial Loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 37,722 | 76,707
Allowance for Acquired Impaired Loans Evaluated | 166 | 8
Commercial Loans | Waccamaw Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 22,299 | 40,688
Commercial Loans | Waccamaw Lines Of Credit |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 4,077 | 10,009
Allowance for Acquired Impaired Loans Evaluated | 158 |
Commercial Loans | Peoples Commercial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 9,331 | 23,670
Commercial Loans | Commercial Loan Other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 2,015 | 2,340
Allowance for Acquired Impaired Loans Evaluated | 8 | 8
Consumer Real Estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 52,668 | 62,554
Allowance for Acquired Impaired Loans Evaluated | 877 |
Consumer Real Estate | Waccamaw Serviced Home Equity Lines |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 44,407 | 50,343
Allowance for Acquired Impaired Loans Evaluated | 443 |
Consumer Real Estate | Waccamaw Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 5,631 | 8,974
Allowance for Acquired Impaired Loans Evaluated | 270 |
Consumer Real Estate | Peoples Residential |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | 2,630 | 3,237
Allowance for Acquired Impaired Loans Evaluated | 164 |
Consumer and Other | Waccamaw Consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Acquired Impaired Loans Evaluated for Impairment | $ 43 | $ 101

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