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Changes to Accumulated Other Comprehensive Income (Loss), net - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Beginning Balance $ 327,788 [1] $ 185,989
Change in net unrealized holding losses on securities available for sale, net of deferred tax expense 3,806 (2,558)
Ending Balance 338,289 180,906
Net Unrealized (Losses) Gains on Available for Sale Securities [Member]    
Beginning Balance (42,887) (45,481)
Change in net unrealized holding losses on securities available for sale, net of deferred tax expense 3,806 (2,558)
Ending Balance (39,081) (48,039)
Transfer of Held-To-Maturity Securities to Available-For-Sale [Member]    
Beginning Balance 425 425
Change in net unrealized holding losses on securities available for sale, net of deferred tax expense 0 0
Ending Balance 425 425
Accumulated Other Comprehensive (Loss) Gain    
Beginning Balance (42,462) (45,056)
Change in net unrealized holding losses on securities available for sale, net of deferred tax expense 3,806 (2,558)
Ending Balance $ (38,656) $ (47,614)
[1] Derived from audited December 31, 2024 Consolidated Financial Statements.