SEC Schedule, Article 12-29, Mortgage Loans on Real Estate (Rollforward) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate	$ 2,342,425	$ 11,617,079	$ 1,400,100	$ 1,206,962
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, New Mortgage Loan	1,949,449	11,325,966	716,241
Net unrealized gain	0	0	11,427
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Cost of Mortgage Sold	145,755	530,171	28,613
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Collections of Principal	812,988	1,349,308	496,186
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Amortization of Premium	13,754	13,607	6,317
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure	14,033	3,128	3,384
Net unrealized loss	119	18,299	0
Net realized loss	$ 20,475	$ 136,799	$ 30