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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (loss) Pre-Tax and After-Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
After-tax
Other comprehensive income (loss)	$ 29,610	$ (88,214)	$ (18,911)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent
Pre-tax
Unrealized holding gains (losses) arising during the period	37,793	(118,832)	(24,477)
Less: Reclassification adjustments (gains) losses realized in net income	1,490	1,818	(215)
Other comprehensive income (loss)	39,283	(117,014)	(24,692)
Tax
Unrealized holding gains (losses) arising during the period	9,306	(29,247)	(5,731)
Less: Reclassification adjustments (gains) losses realized in net income	367	447	(50)
Other comprehensive income (loss)	9,673	(28,800)	(5,781)
After-tax
Unrealized holding gains (losses) arising during the period	28,487	(89,585)	(18,746)
Less: Reclassification adjustments (gains) losses realized in net income	1,123	1,371	(165)
Other comprehensive income (loss)	$ 29,610	$ (88,214)	$ (18,911)

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