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Other Comprehensive Income - Summary of Components of OCI (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Equity [Abstract]
Net change in fair value recorded in accumulated OCI, Before-tax	$ (194,111)	$ (14,515)	$ (539,066)	$ (45,989)
Net change in fair value recorded in accumulated OCI, Tax effect	(57,386)	4,291	159,367	13,596
Net change in fair value recorded in accumulated OCI, After-tax	(136,725)	(10,224)	(379,699)	(32,393)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, Before-tax	95	72	242	173
Amortization of unrealized gains (losses) on securities transferred from available-for-sale to held-to-maturity, Tax effect	(28)	(21)	(72)	(51)
Amortization of unrealized losses on securities transferred from available-for-sale to held-to-maturity, After-tax	67	51	170	122
Net change, Before-tax	(194,016)	(14,443)	(538,825)	(45,816)
Net change, Tax effect	57,358	4,270	159,296	13,545
Net change, After-tax	$ (136,658)	$ (10,173)	$ (379,529)	$ (32,271)

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- Definition

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

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