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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
	Mar. 31, 2023	Mar. 31, 2022
After-tax
Other comprehensive income (loss)	$ 13,791	$ (42,910)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent
Pre-tax
Unrealized holding gains (losses) arising during the period	17,593	(57,161)
Less: Reclassification adjustments for (gains) losses realized in net income (loss)	701	264
Other comprehensive income (loss)	18,294	(56,897)
Tax
Unrealized holding gains (losses) arising during the period	4,330	(14,052)
Less: Reclassification adjustments for (gains) losses realized in net income (loss)	173	65
Other comprehensive income (loss)	4,503	(13,987)
After-tax
Unrealized holding gains (losses) arising during the period	13,263	(43,109)
Less: Reclassification adjustments for (gains) losses realized in net income (loss)	528	199
Other comprehensive income (loss)	$ 13,791	$ (42,910)

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