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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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- Definition 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). + References No definition available. + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 325 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123599499&loc=d3e63345-112809 + Details
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