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