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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, 2022	Dec. 31, 2021	Dec. 31, 2020
After-tax
Other comprehensive income (loss)	$ (88,214)	$ (18,911)	$ (17,618)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent
Pre-tax
Unrealized holding gains (losses) arising during the period	(118,832)	(24,477)	33,575
Less: Reclassification adjustments (gains) losses realized in net income	1,818	(215)	(56,914)
Other comprehensive income (loss)	(117,014)	(24,692)	(23,339)
Tax
Unrealized holding gains (losses) arising during the period	(29,247)	(5,731)	7,884
Less: Reclassification adjustments (gains) losses realized in net income	447	(50)	(13,605)
Other comprehensive income (loss)	(28,800)	(5,781)	(5,721)
After-tax
Unrealized holding gains (losses) arising during the period	(89,585)	(18,746)	25,691
Less: Reclassification adjustments (gains) losses realized in net income	1,371	(165)	(43,309)
Other comprehensive income (loss)	(88,214)	(18,911)	(17,618)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Cumulative Effect, Period of Adoption, Adjustment
Pre-tax
Less: Reclassification adjustments (gains) losses realized in net income	0	0	791
Tax
Less: Reclassification adjustments (gains) losses realized in net income	0	0	194
After-tax
Less: Reclassification adjustments (gains) losses realized in net income	0	0	597
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent | Cumulative Effect, Period of Adoption, Adjusted Balance
Pre-tax
Other comprehensive income (loss)	(117,014)	(24,692)	(22,548)
Tax
Other comprehensive income (loss)	(28,800)	(5,781)	(5,527)
After-tax
Other comprehensive income (loss)	$ (88,214)	$ (18,911)	$ (17,021)

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