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Acquisitions and Divestitures - Additional Information (Detail) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 31, 2015 USD ($) Business | Dec. 12, 2014 USD ($) Branch | Oct. 24, 2014 USD ($) Branch | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net gain on branch divestiture |  |  |  |  | $ 755,000 |  |
Allocation of goodwill |  |  |  | $ 100,486,000 | 100,722,000 | $ 105,455,000 | $ 104,866,000
Proceeds from sale of business |  |  |  | (231,000) | (131,230,000) |  |
Insurance Services |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net gain on branch divestiture | $ (8,000) |  |  |  |  |  |
Number of insurance agencies sold | Business | 1 |  |  |  |  |  |
Proceeds from sale of business | $ 372,000 |  |  |  |  |  |
Goodwill write down |  |  |  | 324,000 |  |  |
Intangible assets write down |  |  |  | 61,000 |  |  |
Purchase price |  |  |  |  |  | 385,000 |
Cash consideration |  |  |  |  |  | 150,000 |
Additional cash consideration |  |  |  |  |  | 235,000 |
Earn-out payments related to acquisitions |  |  |  | $ 88,000 | $ 353,000 | $ 442,000 |
CresCom Bank |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of operating branches sold | Branch |  | 13 |  |  |  |  |
Deposit assumed by the buyer |  | $ 215,190,000 |  |  |  |  |
Loan assumed by the buyer |  | 70,040,000 |  |  |  |  |
Net gain on branch divestiture |  | 755,000 |  |  |  |  |
Deposit premium received |  | 6,450,000 |  |  |  |  |
Allocation of goodwill |  | $ 6,450,000 |  |  |  |  |
Southeastern, Coastal region of North Carolina | CresCom Bank |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of operating branches sold | Branch |  | 10 |  |  |  |  |
South Carolina | CresCom Bank |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of operating branches sold | Branch |  | 3 |  |  |  |  |
Bank of America |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of operating branches | Branch |  |  | 7 |  |  |  |
Deposit held on acquisition date by acquiree |  |  | $ 318,880,000 |  |  |  |
Premium on deposits acquired |  |  | 5,790,000 |  |  |  |
Loans recognized |  |  | $ 0 |  |  |  |
Bank of America | Southwestern Virginia |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of operating branches | Branch |  |  | 6 |  |  |  |
Bank of America | Central North Carolina |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of operating branches | Branch |  |  | 1 |  |  |  |

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