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Loans and Investments - Investment Portfolio and Concentration of Credit Risk (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($) loan	Jun. 30, 2023 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Loans and Investments
Loans and investments, gross	$ 12,615,006	$ 14,456,123
Allowance for credit losses	(195,664)	(132,559)		$ (113,241)	$ (148,329)
Unearned revenue	(41,536)	(68,890)
Loans and investments, net	$ 12,377,806	$ 14,254,674		11,981,048	5,285,868
Percent of Total	100.00%	100.00%
Loan Count | loan	747	747
Wtd. Avg. Pay Rate (as a percent)	8.42%	8.17%
Wtd. Avg. Remaining Months to Maturity	13 months 6 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)	78.00%	76.00%
Mortgage loans on real estate remaining maturity period, including extension options	29 months 12 days	37 months 27 days
Single- Family Rental
Loans and Investments
Allowance for credit losses	$ (1,624)	$ (780)		$ (319)	$ (586)
Bridge Loans
Loans and Investments
Loans and investments, gross	$ 12,273,244	$ 14,096,054	$ 70,500
Percent of Total	97.00%	98.00%
Loan Count | loan	679	692
Wtd. Avg. Pay Rate (as a percent)	8.45%	8.17%
Wtd. Avg. Remaining Months to Maturity	12 months	19 months 24 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	78.00%	76.00%
Bridge Loans | Single- Family Rental
Loans and Investments
Number of loans under the loan portfolio | loan	354	241
Total loan commitment	$ 2,510,000	$ 1,570,000
Mezzanine loans
Loans and Investments
Loans and investments, gross	$ 248,457	$ 213,499
Percent of Total	2.00%	1.00%
Loan Count | loan	49	44
Wtd. Avg. Pay Rate (as a percent)	8.41%	8.13%
Wtd. Avg. Remaining Months to Maturity	56 months 18 days	63 months 3 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	48.00%	42.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	80.00%	77.00%
Preferred equity investments
Loans and Investments
Loans and investments, gross	$ 85,741	$ 110,725
Percent of Total	1.00%	1.00%
Loan Count | loan	17	8
Wtd. Avg. Pay Rate (as a percent)	3.95%	7.63%
Wtd. Avg. Remaining Months to Maturity	60 months 9 days	39 months 6 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	53.00%	46.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	82.00%	79.00%
SFR Permanent Loans
Loans and Investments
Loans and investments, gross	$ 7,564	$ 35,845
Percent of Total	1.00%	1.00%
Loan Count | loan	2	3
Wtd. Avg. Pay Rate (as a percent)	9.84%	8.76%
Wtd. Avg. Remaining Months to Maturity	13 months 27 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)	56.00%	58.00%
SFR Permanent Loans | Single- Family Rental
Loans and Investments
Total loan commitment	$ 1,320,000	$ 927,400

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- Definition

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

+ References

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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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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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+ References

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

+ References

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

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

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-SubTopic 20
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-Paragraph 1
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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Paragraph 4
-Publisher FASB
-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
-Topic 944
-SubTopic 210
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