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Credit Quality - Additional information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Restructured loans to borrowers experiencing financial difficulty in excess of | $ 250,000 |
Performing status returned period | 6 months |
Covered Loans Recorded as TDR | $ 14,236,000 | $ 15,301,000
Waccamaw Bank |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Percentage of loan and foreclosed real estate losses covered by FDIC | 80.00% |
Non Covered Loans |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Accruing loans contractually past due 90 days or more | $ 0 | 0
Covered Loans |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Covered Loans Recorded as TDR | $ 0 | $ 0

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Recorded Investment -URI http://asc.fasb.org/extlink&oid=65880944 + Details
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