Acquisitions and Divestitures - Additional Information (Detail)
$ in Thousands |
|
3 Months Ended |
9 Months Ended |
|
Jul. 15, 2016
USD ($)
Branch
|
Sep. 30, 2016
USD ($)
|
Sep. 30, 2016
USD ($)
|
Sep. 30, 2015
USD ($)
|
| Business Acquisition And Disposal [Line Items] |
|
|
|
|
| Merger, acquisition, and divestiture expense |
|
$ 226
|
$ 675
|
$ 86
|
| Net gain on branch divestiture |
|
$ 3,065
|
$ 3,065
|
|
| Divestiture of Bank Branches to First Bank |
|
|
|
|
| Business Acquisition And Disposal [Line Items] |
|
|
|
|
| Number of operating branches exchanged | Branch |
6
|
|
|
|
| Cash consideration received |
$ 24,820
|
|
|
|
| Net gain on branch divestiture |
3,070
|
|
|
|
| Allowance for loan and lease loss, reversed |
1,350
|
|
|
|
| Deposit premium received |
$ 4,070
|
|
|
|
| Divestiture of Bank Branches to First Bank | North Carolina |
|
|
|
|
| Business Acquisition And Disposal [Line Items] |
|
|
|
|
| Number of operating branches sold | Branch |
6
|
|
|
|
| Acquisition of Bank Branches from First Bank | Southwestern Virginia |
|
|
|
|
| Business Acquisition And Disposal [Line Items] |
|
|
|
|
| Number of operating branches | Branch |
7
|
|
|
|
| Premium paid |
$ 3,840
|
|
|
|
| Bank of America | Southwestern Virginia |
|
|
|
|
| Business Acquisition And Disposal [Line Items] |
|
|
|
|
| Number of operating branches | Branch |
7
|
|
|
|