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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity [Abstract]
Net change in fair value recorded in accumulated OCI, Before-tax	$ 8,917	$ (1,263)	$ (31,474)	$ 35,356
Net change in fair value recorded in accumulated OCI, Tax effect	(2,636)	373	9,305	(10,453)
Net change in fair value recorded in accumulated OCI, After-tax	6,281	(890)	(22,169)	24,903
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax	20	(17)	101	(18)
Amortization of unrealized gains (losses) on securities transferred from available-for-sale to held-to-maturity, Tax effect	(6)	5	(30)	5
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax	14	(12)	71	(13)
Net change, Before-tax	8,937	(1,280)	(31,373)	35,338
Net change, Tax effect	(2,642)	378	9,275	(10,448)
Net change, After-tax	$ 6,295	$ (902)	$ (22,098)	$ 24,890

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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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