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Goodwill and Intangibles - Schedule of Goodwill (Detail) - USD ($)
Dec. 31, 2019
Dec. 15, 2019
Dec. 31, 2018
Goodwill [Line Items]      
Goodwill $ 19,914,942 $ 16,608,278 $ 2,694,164
Charlottesville Branch [Member]      
Goodwill [Line Items]      
Goodwill 366,300   366,300
River Bancorp, Inc. [Member]      
Goodwill [Line Items]      
Goodwill 1,727,864   1,727,864
Mortgage Business [Member]      
Goodwill [Line Items]      
Goodwill 600,000   $ 600,000
Hammond Insurance [Member]      
Goodwill [Line Items]      
Goodwill 612,500    
Virginia Community Bankshares, Inc [Member]      
Goodwill [Line Items]      
Goodwill $ 16,608,278