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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity [Abstract]
Net change in fair value recorded in accumulated OCI, Before-tax	$ (14,515)	$ (1,974)	$ (45,989)	$ 33,382
Net change in fair value recorded in accumulated OCI, Tax effect	4,291	584	13,596	(9,869)
Net change in fair value recorded in accumulated OCI, After-tax	(10,224)	(1,390)	(32,393)	23,513
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax	72	(30)	173	(48)
Amortization of unrealized gains (losses) on securities transferred from available-for-sale to held-to-maturity, Tax effect	(21)	9	(51)	14
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax	51	(21)	122	(34)
Net change, Before-tax	(14,443)	(2,004)	(45,816)	33,334
Net change, Tax effect	4,270	593	13,545	(9,855)
Net change, After-tax	$ (10,173)	$ (1,411)	$ (32,271)	$ 23,479

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Other comprehensive income (loss) amortization of unrealized gain (loss) on securities transferred from available for sale to held to maturity before tax.

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