Other Assets and Liabilities - Summary of Components of Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Other Assets And Liabilities Disclosure [Abstract]
Accrued interest receivable	$ 160,131	$ 214,835
Accounts receivable and other assets	134,030	2,420
Loan portfolio payments held by servicer	113,199	152,423
Real estate intangible assets, net	77,289	0
Derivative assets	72,454	1,890
Other Real Estate Assets	9,338	0
Collateral deposited under derivative agreements	4,810	103,500
Prepaid expenses	1,002	1,020
Total	572,253	$ 476,088
Cash collateral	$ 95,500