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Loans and Investments - Investment Portfolio and Concentration of Credit Risk (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($) loan	Dec. 31, 2022 USD ($) loan	Jun. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loans and Investments
Loans and investments, gross	$ 13,122,395	$ 14,456,123
Allowance for credit losses	(184,069)	(132,559)	$ (169,054)	$ (122,296)	$ (121,331)	$ (113,241)
Unearned revenue	(45,530)	(68,890)
Loans and investments, net	$ 12,892,796	$ 14,254,674
Percent of Total	100.00%	100.00%
Loan Count | loan	723	747
Wtd. Avg. Pay Rate (as a percent)	8.80%	8.17%
Wtd. Avg. Remaining Months to Maturity	14 months 27 days	20 months 18 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	1.00%	1.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	77.00%	76.00%
Single-Family Rental
Loans and Investments
Allowance for credit losses	$ (1,239)	$ (781)	(1,077)	$ (2,051)	$ (725)	$ (320)
Bridge loans
Loans and Investments
Loans and investments, gross	$ 12,790,972	$ 14,096,054	$ 70,500
Percent of Total	97.00%	98.00%
Loan Count | loan	664	692
Wtd. Avg. Pay Rate (as a percent)	8.85%	8.17%
Wtd. Avg. Remaining Months to Maturity	13 months 24 days	19 months 24 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	77.00%	76.00%
Bridge loans | Single-Family Rental
Loans and Investments
Number of loans under the loan portfolio | loan	311	241
Total loan commitment	$ 2,050,000	$ 1,570,000
Mezzanine loans
Loans and Investments
Loans and investments, gross	$ 233,805	$ 213,499
Percent of Total	2.00%	1.00%
Loan Count | loan	47	44
Wtd. Avg. Pay Rate (as a percent)	8.35%	8.13%
Wtd. Avg. Remaining Months to Maturity	54 months 21 days	63 months 3 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	45.00%	42.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	79.00%	77.00%
Preferred equity investments
Loans and Investments
Loans and investments, gross	$ 87,924	$ 110,725
Percent of Total	1.00%	1.00%
Loan Count | loan	10	8
Wtd. Avg. Pay Rate (as a percent)	3.03%	7.63%
Wtd. Avg. Remaining Months to Maturity	62 months	39 months 6 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	47.00%	46.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	84.00%	79.00%
Other loans
Loans and Investments
Loans and investments, gross	$ 9,694	$ 35,845
Percent of Total	1.00%	1.00%
Loan Count | loan	2	3
Wtd. Avg. Pay Rate (as a percent)	9.72%	8.76%
Wtd. Avg. Remaining Months to Maturity	15 months 18 days	32 months 24 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	62.00%	58.00%
Other loans | Single-Family Rental
Loans and Investments
Unpaid principal balance, funded	$ 1,160,000	$ 927,400

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- Definition

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

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

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- Definition

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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Represents the weighted average loan to value ratio that is calculated by comparing the total of the carrying value of the company's loan 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 initially absorb a loss.

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- Definition

Represents a category of loans on real estate expressed as a percentage of total loans on real estate.

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Represents the weighted average remaining maturity period of mortgage loans.

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Weighted average interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Represents the number of loans related to the real estate property under the loan portfolio.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147481962/310-10-50-4

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The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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