Fair Value Disclosures - Schedule of Gain Loss on Sale of Mortgage Loans (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule Of Gain Loss On Sale Of Mortgage Loans [Abstract]
Realized gain on sale and fees on mortgage loans*	[1]	$ 6,311	$ 9,465	$ 12,309	$ 20,195
Change in fair value on loans held-for-sale and IRLCs		1,462	2,008	(453)	(3,193)
Change in forward mortgage-backed securities trades		(2,045)	(3,182)	205	1,183
Total gain on sale of mortgage loans		$ 5,728	$ 8,291	$ 12,061	$ 18,185

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