Fair Value Disclosures - Schedule of Gain Loss on Sale of Mortgage Loans (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Schedule Of Gain Loss On Sale Of Mortgage Loans [Abstract]
Realized gain on sale and fees on mortgage loans*	[1]	$ 4,664	$ 9,050	$ 16,973	$ 29,245
Change in fair value on loans held-for-sale and IRLCs		(2,433)	1,466	(2,886)	(4,659)
Change in forward mortgage-backed securities trades		1,839	(1,204)	2,044	2,387
Total gain on sale of mortgage loans		$ 4,070	$ 8,788	$ 16,131	$ 26,973

[1] This includes gains on loans held-for-sale carried under the fair value method and lower of cost or market.