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Loans and Investments - Investment Portfolio and Concentration of Credit Risk (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2024 USD ($) loan	Sep. 30, 2024 USD ($) loan	Dec. 31, 2023 USD ($) loan	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Loans and Investments
Loans and investments, gross	$ 11,565,538	$ 11,565,538	$ 12,615,006
Allowance for credit losses	(243,588)	(243,588)	(195,664)	$ (238,923)		$ (184,069)	$ (169,054)	$ (132,559)
Unearned revenue	(29,303)	(29,303)	(41,536)
Loans and investments, net	$ 11,292,647	$ 11,292,647	$ 12,377,806
Percent of Total	100.00%	100.00%	100.00%
Loan Count | loan		789	747
Wtd. Avg. Pay Rate (as a percent)		7.25%	8.42%
Wtd. Avg. Remaining Months to Maturity		11 months 24 days	13 months 6 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	2.00%	2.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	80.00%	80.00%
Weighted average remaining months to maturity including extension options	24 months 3 days		29 months 12 days
Single-Family Rental
Loans and Investments
Allowance for credit losses	$ (4,220)	$ (4,220)	$ (1,624)	$ (3,913)		$ (1,239)	(1,077)	$ (781)
Bridge loans
Loans and Investments
Loans and investments, gross	$ 11,169,284	$ 11,169,284	$ 12,273,244		$ 13,500		$ 70,500
Percent of Total	97.00%	97.00%	97.00%
Loan Count | loan		702	679
Wtd. Avg. Pay Rate (as a percent)		7.26%	8.45%
Wtd. Avg. Remaining Months to Maturity		10 months 15 days	12 months
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%	0.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	80.00%	80.00%	78.00%
Bridge loans | Single-Family Rental
Loans and Investments
Number of loans under the loan portfolio | loan	425	425	354
Total loan commitment		$ 3,750,000	$ 2,860,000
Mezzanine loans
Loans and Investments
Loans and investments, gross	$ 273,086	$ 273,086	$ 248,457
Percent of Total	2.00%	2.00%	2.00%
Loan Count | loan		59	49
Wtd. Avg. Pay Rate (as a percent)		7.84%	8.41%
Wtd. Avg. Remaining Months to Maturity		50 months 24 days	56 months 18 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	51.00%	51.00%	48.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	82.00%	82.00%	80.00%
Preferred equity investments
Loans and Investments
Loans and investments, gross	$ 120,082	$ 120,082	$ 85,741
Percent of Total	1.00%	1.00%	1.00%
Loan Count | loan		27	17
Wtd. Avg. Pay Rate (as a percent)		5.27%	3.95%
Wtd. Avg. Remaining Months to Maturity		52 months 6 days	60 months 9 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	56.00%	56.00%	53.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	80.00%	80.00%	82.00%
SFR permanent loans
Loans and Investments
Loans and investments, gross	$ 3,086	$ 3,086	$ 7,564
Percent of Total	1.00%	1.00%	1.00%
Loan Count | loan		1	2
Wtd. Avg. Pay Rate (as a percent)		9.88%	9.84%
Wtd. Avg. Remaining Months to Maturity		13 months 9 days	13 months 27 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%	0.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	40.00%	40.00%	56.00%
SFR permanent loans | Single-Family Rental
Loans and Investments
Unpaid principal balance, funded	$ 1,780,000	$ 1,780,000	$ 1,320,000

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Funded amount, before allowance for credit loss, of financing receivable.

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Represents the weighted average First Dollar LTV Ratio that is calculated by comparing the total of the company's senior most dollar and all senior lien positions within the capital stack to the fair value of the underlying collateral to determine the point at which the company will absorb a total loss of its position.

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