Fair Value Disclosures - Schedule of Gain Loss on Sale of Mortgage Loans (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Schedule Of Gain Loss On Sale Of Mortgage Loans [Abstract]
Realized gain on sale and fees on mortgage loans*	[1]	$ 2,859	$ 5,998
Change in fair value on loans held-for-sale and IRLCs		534	(1,915)
Change in forward mortgage-backed securities trades		(419)	2,250
Total gain on sale of mortgage loans		$ 2,974	$ 6,333

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