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Investment Securities and Other Investments - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule Of Investments [Line Items] |  |  |
Securities available for sale, at fair value | $ 351,990 | $ 354,341 | [1]
Federal home loan bank stock | 11,800 | 14,700 |
Federal reserve bank stock | 6,100 | 6,100 |
Correspondent bank stock | 468 | 468 |
Other equity investments | 23,000 | 23,800 |
Asset Pledged as Collateral without Right [Member] | FHLB [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Securities pledged | 242,800 | $ 241,900 |
Asset Pledged as Collateral without Right [Member] | BTFP [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Securities pledged | 29,900 |  |
Debt securities, amortized cost | 29,800 |  |
Securities available for sale, at fair value | $ 25,500 |  |
[1] | Derived from audited December 31, 2022 Consolidated Financial Statements.

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