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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, 2022	Dec. 31, 2021	Dec. 31, 2020
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax [Abstract]
Net unrealized gain (loss) on available-for-sale securities	$ (44,366)	$ (10,948)	$ 6,091
Reclassification adjustment for (gain) loss on sale of available-for-sale securities		(293)	(270)
Net unrealized gain (loss) on available-for-sale securities	(44,366)	(11,241)	5,821
Tax expense (benefit)	(9,317)	(2,360)	1,222
Other comprehensive income (loss)	$ (35,049)	$ (8,881)	$ 4,599

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