Fair Value Disclosures - Schedule of Gain Loss on Sale of Mortgage Loans (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule Of Gain Loss On Sale Of Mortgage Loans [Abstract]
Realized gain on sale and fees on mortgage loans*	[1]	$ 3,485	$ 4,664	$ 9,774	$ 16,973
Change in fair value on loans held-for-sale and IRLCs		(121)	(2,433)	24	(2,886)
Change in forward mortgage-backed securities trades		78	1,839	152	2,044
Total gain on sale of mortgage loans		$ 3,442	$ 4,070	$ 9,950	$ 16,131

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