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Allowance for Loan Losses and Recorded Investment in PCI Loans, by Loan Pool (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]    
Acquired Impaired Loans Evaluated for Impairment $ 68,827 $ 81,711
Allowance for Acquired Impaired Loans Evaluated 418 755
Commercial Loans
    
Financing Receivable, Recorded Investment [Line Items]    
Acquired Impaired Loans Evaluated for Impairment 23,854 32,238
Allowance for Acquired Impaired Loans Evaluated 16 77
Commercial Loans | Waccamaw Commercial
    
Financing Receivable, Recorded Investment [Line Items]    
Acquired Impaired Loans Evaluated for Impairment 14,460 19,851
Commercial Loans | Waccamaw Lines Of Credit
    
Financing Receivable, Recorded Investment [Line Items]    
Acquired Impaired Loans Evaluated for Impairment 870 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 6,621 7,862
Allowance for Acquired Impaired Loans Evaluated 8  
Commercial Loans | Commercial Loan Other
    
Financing Receivable, Recorded Investment [Line Items]    
Acquired Impaired Loans Evaluated for Impairment 1,903 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 44,961 49,439
Allowance for Acquired Impaired Loans Evaluated 402 678
Consumer Real Estate | Waccamaw Serviced Home Equity Lines
    
Financing Receivable, Recorded Investment [Line Items]    
Acquired Impaired Loans Evaluated for Impairment 40,142 43,608
Allowance for Acquired Impaired Loans Evaluated 81 277
Consumer Real Estate | Waccamaw Residential
    
Financing Receivable, Recorded Investment [Line Items]    
Acquired Impaired Loans Evaluated for Impairment 3,578 4,497
Allowance for Acquired Impaired Loans Evaluated 56 217
Consumer Real Estate | Peoples Residential
    
Financing Receivable, Recorded Investment [Line Items]    
Acquired Impaired Loans Evaluated for Impairment 1,241 1,334
Allowance for Acquired Impaired Loans Evaluated 265 184
Consumer and Other | Waccamaw Consumer
    
Financing Receivable, Recorded Investment [Line Items]    
Acquired Impaired Loans Evaluated for Impairment $ 12 $ 34