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Goodwill and Intangibles - Schedule of Goodwill (Detail) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 15, 2019
--- | --- | --- | ---
Goodwill [Line Items] |  |  |
Goodwill | $ 19,892,000 | $ 19,915,000 | $ 16,608,278
Charlottesville Branch [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 366,000 | 366,000 |
River Bancorp, Inc. [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 1,728,000 | 1,728,000 |
Mortgage Business [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 600,000 | 600,000 |
Hammond Insurance [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 613,000 | 613,000 |
Virginia Community Bankshares, Inc [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 16,585,000 | $ 16,608,000 |

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