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Summary of Significant Accounting Policies - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract]
Net unrealized gain (loss) on available-for-sale securities	$ 4,797	$ 10,781	$ (44,366)
Reclassification adjustment for loss on sale of available-for-sale securities	0	891	0
Net unrealized gain (loss) on available-for-sale securities	4,797	11,672	(44,366)
Tax expense (benefit)	1,008	2,451	(9,317)
Other comprehensive income (loss)	$ 3,789	$ 9,221	$ (35,049)

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