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Credit Quality - Additional information (Detail) (USD $) | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Covered Loans | Dec. 31, 2013 Covered Loans | Sep. 30, 2014 PCI loans Loan | Dec. 31, 2013 PCI loans Loan | Sep. 30, 2013 PCI loans Loan | Sep. 30, 2014 Waccamaw Bank | Jun. 30, 2014 Waccamaw Bank
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of impaired loans |  |  |  |  |  |  |  | 1 | 4 | 4 |  |
Number of loans |  |  |  |  |  |  |  | 7 |  |  |  |
Minimum commercial loan relationships to be reviewed by loan review function | $ 4,000,000 |  | $ 4,000,000 |  |  |  |  |  |  |  |  |
Percentage of loan and foreclosed real estate losses covered by FDIC |  |  |  |  |  |  |  |  |  |  | 80.00% | 80.00%
Amount of non-covered loans decreased |  |  |  |  |  |  |  |  |  |  | 15,230,000 |
Percentage of non-covered loans decreased |  |  |  |  |  |  |  |  |  |  | 13.56% |
Amount of covered loans decreased |  |  |  |  |  |  |  |  |  |  | 16,220,000 |
Percentage of covered loans decreased |  |  |  |  |  |  |  |  |  |  | 19.06% |
Accruing loans contractually past due 90 days or more |  |  |  |  |  | 0 | 86,000 |  |  |  |  |
Restructured loans to borrowers experiencing financial difficulty in excess of | 250,000 |  | 250,000 |  |  |  |  |  |  |  |  |
Performing status returned period |  |  | 6 months |  |  |  |  |  |  |  |  |
Allowance for loan losses | 653,000 |  | 653,000 |  | 1,840,000 |  |  |  |  |  |  |
Interest income recognized on loan restructurings | $ 188,000 | $ 183,000 | $ 466,000 | $ 422,000 |  |  |  |  |  |  |  |

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- Definition Allowance for loan losses. + References No definition available. + Details
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- Definition Total commercial loans. + References No definition available. + Details
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- Definition Interest income recognized on loan restructurings. + References No definition available. + Details
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- Definition Percentage of loss covered by FDIC. + References No definition available. + Details
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- Details
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- Definition Recorded investment in financing receivables that are 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5111-111524 + Details
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