Liability for Losses under Representations and Warranties - Summary of Company's Liability for Losses under Representations and Warranties (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Mortgage Banking [Abstract]
Balance, beginning of period	$ 19,519	$ 39,407	$ 26,143	$ 39,471
Provision for losses:
Pursuant to loan sales	204	738	458	1,678
Reduction in liability due to change in estimate	(6,540)	(2,939)	(13,418)	(3,555)
Losses incurred	0	(137)	0	(525)
Balance, end of period	13,183	37,069	13,183	37,069
UPB of loans subject to representations and warranties at end of period	$ 222,907,138	$ 230,128,231	$ 222,907,138	$ 230,128,231