Secured Financing Agreements - Summary of Outstanding Borrowings (Details) - USD ($) $ in Thousands	Nov. 07, 2023	Sep. 30, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Repurchase facilities		$ 921,348	$ 1,015,566
Asset-specific financings		45,823	44,913
Other Secured Financings		100,000	100,000
Unused Capacity		878,652	905,525
Total Capacity		1,800,000	1,921,091
Carrying Value of Collateral, Assets		1,392,449	1,486,138
Real estate owned, net		17,527	0
Secured Debt
Line of Credit Facility [Line Items]
Other Secured Financings		100,000	100,000
Unused Capacity		0	0
Carrying Value of Collateral, Liability		$ 123,112	$ 157,112
Weighted Average Borrowing Rate		11.80%	10.80%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility, accordion feature, increase limit		$ 200,000	$ 200,000
Revolving Credit Facility | Asset Pledged as Collateral
Line of Credit Facility [Line Items]
Real estate owned, net		4,500
Asset-specific financings
Line of Credit Facility [Line Items]
Asset-specific financings		45,823	44,913
Unused Capacity		104,177	105,087
Total Capacity		150,000	150,000
Carrying Value of Collateral, Assets		$ 59,582
Weighted Average Borrowing Rate		7.10%
Asset-specific financings | Secured Debt
Line of Credit Facility [Line Items]
Carrying Value of Collateral, Assets			$ 57,629
Weighted Average Borrowing Rate			6.00%
Loans Receivable | Morgan Stanley Bank
Line of Credit Facility [Line Items]
Repurchase facilities		$ 246,196	$ 494,250
Unused Capacity		228,804	105,750
Total Capacity		475,000	600,000
Carrying Value of Collateral, Assets		$ 374,085	$ 701,469
Weighted Average Borrowing Rate, Assets		8.00%	7.00%
Loans Receivable | Goldman Sachs Bank USA
Line of Credit Facility [Line Items]
Repurchase facilities		$ 99,856	$ 66,914
Unused Capacity		150,144	183,086
Total Capacity		250,000	250,000
Carrying Value of Collateral, Assets		$ 173,005	$ 93,651
Weighted Average Borrowing Rate, Assets		8.10%	6.50%
Assets sold under agreements to repurchase, accordion feature, increase limit		$ 350,000	$ 350,000
Loans Receivable | Goldman Sachs Bank USA | Subsequent Event
Line of Credit Facility [Line Items]
Assets sold under agreements to repurchase, accordion feature, increase limit	$ 525,000
Loans Receivable | JPMorgan Chase Bank
Line of Credit Facility [Line Items]
Repurchase facilities		367,672	132,438
Unused Capacity		57,328	217,562
Total Capacity		425,000	350,000
Carrying Value of Collateral, Assets		$ 553,757	$ 211,841
Weighted Average Borrowing Rate, Assets		8.40%	6.70%
Loans Receivable | Citibank
Line of Credit Facility [Line Items]
Repurchase facilities		$ 200,595	$ 204,593
Unused Capacity		299,405	295,407
Total Capacity		500,000	500,000
Carrying Value of Collateral, Assets		$ 269,645	$ 266,179
Weighted Average Borrowing Rate, Assets		7.10%	6.10%
Loans Receivable | Wells Fargo Bank
Line of Credit Facility [Line Items]
Repurchase facilities			$ 71,091
Unused Capacity			0
Total Capacity			71,091
Carrying Value of Collateral, Assets			$ 111,154
Weighted Average Borrowing Rate, Assets			6.30%
Loans Receivable | Centennial Bank
Line of Credit Facility [Line Items]
Repurchase facilities		$ 7,029	$ 46,280
Unused Capacity		142,971	103,720
Total Capacity		150,000	150,000
Carrying Value of Collateral, Assets		$ 21,957	$ 101,844
Weighted Average Borrowing Rate, Assets		10.30%	9.30%