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Acquisitions and Divestitures - Additional Information (Detail) |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2016 USD ($) Branch | Jul. 15, 2016 USD ($) Branch | Oct. 31, 2015 USD ($) Business | Dec. 12, 2014 USD ($) | Oct. 24, 2014 USD ($) Branch | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Business Acquisition And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  |  |  |  | $ 58,226,000 | $ (231,000) | $ (131,230,000) |
Net gain on branch divestiture |  |  |  |  |  | 3,682,000 |  | 755,000 |
Business combination, acquisition related costs |  |  |  |  |  | 684,000 |  |  |
Allocation of goodwill |  |  |  |  |  | 95,779,000 | 100,486,000 | $ 100,722,000 | $ 105,455,000
Insurance Services |  |  |  |  |  |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of business |  |  | $ 372,000 |  |  |  |  |  |
Net gain on branch divestiture |  |  | (8,000) |  |  |  |  |  |
Goodwill and other intangible assets write down |  |  | $ 385,000 |  |  |  |  |  |
Number of insurance agencies sold | Business |  |  | 1 |  |  |  |  |  |
Earn-out payments related to acquisitions |  |  |  |  |  |  | $ 88,000 |  |
CresCom Bank |  |  |  |  |  |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Number of operating branches sold |  |  |  | 13 |  |  |  |  |
Net gain on branch divestiture |  |  |  | $ 755,000 |  |  |  |  |
Loan divested by the buyer |  |  |  | 70,040,000 |  |  |  |  |
Deposit premium received |  |  |  | 6,450,000 |  |  |  |  |
Deposit divested by the buyer |  |  |  | 215,190,000 |  |  |  |  |
Allocation of goodwill |  |  |  | $ 6,450,000 |  |  |  |  |
CresCom Bank | Southeastern, Coastal region of North Carolina |  |  |  |  |  |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Number of operating branches sold |  |  |  | 10 |  |  |  |  |
CresCom Bank | South Carolina |  |  |  |  |  |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Number of operating branches sold |  |  |  | 3 |  |  |  |  |
Divestiture of Bank Branches to First Bank |  |  |  |  |  |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Net gain on branch divestiture |  | $ 3,070,000 |  |  |  |  |  |  |
Assets divested |  | 162,170,000 |  |  |  |  |  |  |
Loan divested by the buyer |  | 155,540,000 |  |  |  |  |  |  |
Goodwill and other intangible assets divested |  | 2,330,000 |  |  |  |  |  |  |
Liabilities divested |  | 111,050,000 |  |  |  |  |  |  |
Deposits divested |  | 111,020,000 |  |  |  |  |  |  |
Deposit premium received |  | $ 4,070,000 |  |  |  |  |  |  |
Divestiture of Bank Branches to First Bank | Southeastern, Coastal region of North Carolina |  |  |  |  |  |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Number of operating branches sold | Branch |  | 6 |  |  |  |  |  |  |
Greenpoint Insurance Group |  |  |  |  |  |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of business | $ 7,110,000 |  |  |  |  |  |  |  |
Sale of business, earn-out payments to be received | $ 2,210,000 |  |  |  |  |  |  |  |
Sale of business, earn-out payments, term | 3 years |  |  |  |  |  |  |  |
Net gain on branch divestiture |  |  |  |  |  | 617,000 |  |  |
Goodwill and other intangible assets write down |  |  |  |  |  | 6,490,000 |  |  |
Expenses related to divestiture of business |  |  |  |  |  | $ 46,000 |  |  |
Greenpoint Insurance Group | Southeastern, Coastal region of North Carolina |  |  |  |  |  |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Number of operating branches sold | Branch | 2 |  |  |  |  |  |  |  |
Carr and Hyde Insurance | Virginia |  |  |  |  |  |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Number of operating branches sold | Branch | 2 |  |  |  |  |  |  |  |
Bank of America |  |  |  |  |  |  |  |  |
Business Acquisition And Disposal [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 And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Number of operating branches | Branch |  | 7 |  |  | 6 |  |  |  |
Bank of America | Central North Carolina |  |  |  |  |  |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Number of operating branches | Branch |  |  |  |  | 1 |  |  |  |
Acquisition of Bank Branches from First Bank |  |  |  |  |  |  |  |  |
Business Acquisition And Disposal [Line Items] |  |  |  |  |  |  |  |  |
Assets acquired |  | $ 160,690,000 |  |  |  |  |  |  |
Loans acquired |  | 149,120,000 |  |  |  |  |  |  |
Goodwill and other intangible assets acquired |  | 6,290,000 |  |  |  |  |  |  |
Liabilities acquired |  | 134,380,000 |  |  |  |  |  |  |
Deposits acquired |  | 134,310,000 |  |  |  |  |  |  |
Premium paid |  | $ 3,840,000 |  |  |  |  |  |  |

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