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Loans and Investments - Investment Portfolio and Concentration of Credit Risk (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) loan property	Dec. 31, 2020 USD ($) loan property	Mar. 31, 2021 USD ($) loan	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Loans and Investments
Loans and investments, gross	$ 12,158,995	$ 5,475,082
Allowance for credit losses	(113,241)	(148,329)		$ (71,069)
Unearned revenue	(64,706)	(40,885)
Loans and investments, net	$ 11,981,048	$ 5,285,868		$ 4,189,960	$ 3,200,145
Percent of Total	100.00%	100.00%
Loan Count | loan	580	328
Wtd. Avg. Pay Rate (as a percent)	4.26%	5.23%
Wtd. Avg. Remaining Months to Maturity	24 months 18 days	19 months 6 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	1.00%	4.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	76.00%	77.00%
Single-Family Rental
Loans and Investments
Transfer of fixed rate SFR from Structured Business to Agency Business | loan			21
Transfer of UPB from Structured Business To Agency Business			$ 65,200
Credit risk concentration
Loans and Investments
Wtd. Avg. First Dollar LTV Ratio (as percent)	1.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	76.00%
Credit risk concentration | Single-Family Rental
Loans and Investments
Percent of Total	4.00%
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	65.00%
Total assets | Credit risk concentration
Loans and Investments
Loan Count | loan	31	22
Number of different borrowers | property	5	5
Concentration Risk Threshold Percentage	11	12
Bridge Loans
Loans and Investments
Loans and investments, gross	$ 11,750,710	$ 5,022,509
Percent of Total	97.00%	92.00%
Loan Count | loan	528	263
Wtd. Avg. Pay Rate (as a percent)	4.19%	5.09%
Wtd. Avg. Remaining Months to Maturity	23 months 24 days	16 months 6 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	76.00%	76.00%
Bridge Loans | Single-Family Rental
Loans and Investments
Number of loans under the loan portfolio | loan	120	38
Total loan commitment	$ 804,600	$ 309,200
Mezzanine Loans
Loans and Investments
Loans and investments, gross	$ 223,378	$ 159,242
Percent of Total	2.00%	3.00%
Loan Count | loan	39	29
Wtd. Avg. Pay Rate (as a percent)	7.32%	7.40%
Wtd. Avg. Remaining Months to Maturity	56 months 9 days	45 months
Wtd. Avg. First Dollar LTV Ratio (as percent)	34.00%	32.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	84.00%	82.00%
Preferred equity investments
Loans and Investments
Loans and investments, gross	$ 155,513	$ 224,928
Percent of Total	1.00%	4.00%
Loan Count | loan	11	14
Wtd. Avg. Pay Rate (as a percent)	5.57%	7.07%
Wtd. Avg. Remaining Months to Maturity	38 months	49 months 24 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	58.00%	64.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	87.00%	89.00%
Other loans
Loans and Investments
Loans and investments, gross	$ 29,394	$ 68,403
Percent of Total	1.00%	1.00%
Loan Count | loan	2	22
Wtd. Avg. Pay Rate (as a percent)	4.63%	4.95%
Wtd. Avg. Remaining Months to Maturity	48 months 3 days	74 months 24 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	67.00%	69.00%
Other loans | Single-Family Rental
Loans and Investments
Number of loans under the loan portfolio | loan	2	22
Unpaid principal balance, funded	$ 408,200	$ 88,100

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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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Loans before allowance of loans and leases held in portfolio of transfer from Structured Business to Agency Business.

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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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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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