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Investment Securities and Other Investments - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2019
USD ($)
Security
Dec. 31, 2018
USD ($)
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 $ 44,400,000 $ 5,300,000
Realized gain on sales, calls and maturities of available-for-sale 451,000 5,000
Proceeds from sale and maturity of held-to-maturity securities 3,300,000 1,900,000
Unrealized gain (loss) on held-to-maturity securities 0 0
Federal home loan bank stock 6,012,000  
Federal reserve bank stock 963,000  
Community bankers bank stock 248,000  
Other investments 911,000  
Restricted investments 8,100,000  
Federal Home Loan Bank of Atlanta [Member]    
Schedule Of Investments [Line Items]    
Securities pledged 55,700,000 9,800,000
Treasury Board of Virginia [Member]    
Schedule Of Investments [Line Items]    
Securities pledged $ 11,800,000 $ 16,200,000