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Subsequent Events - Additional Information (Detail) - $ / shares | Aug. 13, 2020 | Jul. 06, 2020 | Dec. 15, 2019
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Common stock shares received by shareholders |  |  | 3.05
Subsequent Event [Member] |  |  |
Dividend per common stock |  | $ 0.1425 |
Dividend declared date |  | Jul. 06, 2020 |
Dividend payable date |  | Jul. 31, 2020 |
Dividend payable, record date |  | Jul. 24, 2020 |
Subsequent Event [Member] | Bay Banks of Virginia, Inc. [Member] | Definitive Merger Agreement [Member] |  |  |
Common stock shares received by shareholders | 0.5000 |  |
Percentage of voting interests by acquired entity shareholders | 54.00% |  |
Business acquisition, percentage of interests acquired | 46.00% |  |

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