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Investments - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Schedule Of Investments [Line Items]    
Federal home loan bank stock $ 1,800 $ 1,700
Federal reserve bank stock 6,100 6,100
Correspondent bank stock 468 468
Other equity investments 23,900 14,200
FHLB [Member]    
Schedule Of Investments [Line Items]    
Securities pledged $ 20,000 23,100
Treasury Board Commonwealth of Virginia [Member]    
Schedule Of Investments [Line Items]    
Securities pledged   $ 8,700