Fair Value Disclosures - Schedule of Gain Loss on Sale of Mortgage Loans (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Schedule Of Gain Loss On Sale Of Mortgage Loans [Abstract]
Realized gain on sale and fees on mortgage loans*	[1]	$ 2,580	$ 2,859
Change in fair value on loans held-for-sale and IRLCs		351	534
Change in forward mortgage-backed securities trades		197	(419)
Total gain on sale of mortgage loans		$ 3,128	$ 2,974

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