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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
After-tax
Other comprehensive income (loss)	$ 996	$ (2,542)	$ (5,866)	$ 13,791	$ (1,546)	$ 7,925
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent
Pre-tax
Unrealized holding gains (losses) arising during the period	1,395		(7,803)		(2,047)	9,790
Less: Reclassification adjustments for (gains) losses realized in net income (loss)	(73)		21		(4)	722
Other comprehensive income (loss)	1,322		(7,782)		(2,051)	10,512
Tax
Unrealized holding gains (losses) arising during the period	344		(1,920)		(504)	2,410
Less: Reclassification adjustments for (gains) losses realized in net income (loss)	(18)		4		(1)	177
Other comprehensive income (loss)	326		(1,916)		(505)	2,587
After-tax
Unrealized holding gains (losses) arising during the period	1,051		(5,883)		(1,543)	7,380
Less: Reclassification adjustments for (gains) losses realized in net income (loss)	(55)		17		(3)	545
Other comprehensive income (loss)	$ 996		$ (5,866)		$ (1,546)	$ 7,925

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