Fair Value Disclosures - Schedule of Gain Loss on Sale of Mortgage Loans (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Schedule Of Gain Loss On Sale Of Mortgage Loans [Abstract]
Realized gain on sale and fees on mortgage loans*	[1]	$ 3,429	$ 6,311	$ 6,288	$ 12,309
Change in fair value on loans held-for-sale and IRLCs		(389)	1,462	145	(453)
Change in forward mortgage-backed securities trades		494	(2,045)	75	205
Total gain on sale of mortgage loans		$ 3,534	$ 5,728	$ 6,508	$ 12,061

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