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Investment Securities and Other Investments - Summary of Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Securities available for sale, at fair value | $ 314,394 | $ 321,081 | [1]
Investment securities, Amortized Cost | 375,897 | 379,654 |
Investment securities, Gross Unrealized Gains |  | 12 |
Investment securities, Gross Unrealized Losses | (61,503) | (58,585) |
Investment securities, Fair Value | 314,394 | 321,081 |
Mortgage Backed Securities [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available for sale, Amortized Cost | 208,856 | 212,214 |
Available for sale, Gross Unrealized Losses | (37,634) | (35,244) |
Securities available for sale, at fair value | 171,222 | 176,970 |
U.S. Treasury and Agencies [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available for sale, Amortized Cost | 79,633 | 79,856 |
Available for sale, Gross Unrealized Losses | (11,499) | (10,985) |
Securities available for sale, at fair value | 68,134 | 68,871 |
State and Municipal [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available for sale, Amortized Cost | 50,513 | 50,682 |
Available for sale, Gross Unrealized Losses | (7,587) | (7,357) |
Securities available for sale, at fair value | 42,926 | 43,325 |
Corporate Bonds [Member] |  |  |
Schedule Of Available For Sale And Held To Maturity Securities [Line Items] |  |  |
Available for sale, Amortized Cost | 36,895 | 36,902 |
Available for sale, Gross Unrealized Gains |  | 12 |
Available for sale, Gross Unrealized Losses | (4,783) | (4,999) |
Securities available for sale, at fair value | $ 32,112 | $ 31,915 |
[1] | Derived from audited December 31, 2023 Consolidated Financial Statements.

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