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Investments - Additional Information (Detail) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Schedule Of Investments [Line Items]
Federal home loan bank stock	$ 7,000,000.0	$ 1,700,000
Federal reserve bank stock	6,100,000	6,100,000
Correspondent bank stock	468,000	468,000
Other equity investments	23,600,000	14,200,000
Other investments	17,468,000	12,681,000	[1]
Asset Pledged as Collateral without Right [Member] | FHLB [Member]
Schedule Of Investments [Line Items]
Securities pledged	244,100,000	23,100,000
Asset Pledged as Collateral without Right [Member] | Treasury Board Commonwealth of Virginia [Member]
Schedule Of Investments [Line Items]
Securities pledged	$ 0	$ 8,700,000
[1] Derived from audited December 31, 2021 Consolidated Financial Statements.

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Correspondent bank stock.

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Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Fair value portion of investments accounted under the equity method.

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

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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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Amount of investments classified as other.

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