Fair Value Disclosures - Schedule of Gain Loss on Sale of Mortgage Loans (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Schedule Of Gain Loss On Sale Of Mortgage Loans [Abstract]
Realized gain on sale and fees on mortgage loans*	[1]	$ 3,463	$ 3,485	$ 9,813	$ 9,774
Change in fair value on loans held-for-sale and IRLCs		(10)	(121)	171	24
Change in forward mortgage-backed securities trades		(94)	78	190	152
Total gain on sale of mortgage loans		$ 3,359	$ 3,442	$ 10,174	$ 9,950

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