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Investment Securities and Other Investments - Additional Information (Detail) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Investments [Line Items]
Federal home loan bank stock	$ 14,700,000	$ 1,700,000
Federal reserve bank stock	6,100,000	6,100,000
Correspondent bank stock	468,000	468,000
Other equity investments	23,800,000	14,200,000
Asset Pledged as Collateral without Right [Member] | FHLB [Member]
Schedule Of Investments [Line Items]
Securities pledged	241,900,000	23,100,000
Treasury Board Commonwealth of Virginia [Member] | Asset Pledged as Collateral without Right [Member]
Schedule Of Investments [Line Items]
Securities pledged	$ 0	$ 8,700,000

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Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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