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Goodwill and Intangibles - Schedule of Goodwill (Detail) - USD ($)
Jun. 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