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Investment Securities and Other Investments - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2020
USD ($)
Security
Dec. 31, 2019
USD ($)
Security
Schedule Of Investments [Line Items]    
Securities pledged with Federal Reserve Bank of Richmond | Security 0 0
Proceeds from sales, calls and maturities of available-for-sale $ 53,595,000 $ 44,397,000
Realized gain on sales, calls and maturities of available-for-sale 211,000 451,000
Proceeds from calls, maturities, sales, paydowns and maturities of securities held to maturity 1,212,000 3,280,000
Unrealized gain (loss) on held-to-maturity securities 0 0
Held-to-maturity securities transferred to available for sale 11,000,000  
Federal home loan bank stock 5,800,000 6,000,000
Federal reserve bank stock 2,200,000 963,000
Correspondent bank stock 248,000 248,000
Other investments 3,000,000 911,000
Restricted investments 11,200,000 8,100,000
Federal Home Loan Bank of Atlanta [Member]    
Schedule Of Investments [Line Items]    
Securities pledged 29,400,000 55,700,000
Treasury Board Commonwealth of Virginia [Member]    
Schedule Of Investments [Line Items]    
Securities pledged $ 12,500,000 $ 12,000,000