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Loans and Investments - Investment Portfolio and Concentration of Credit Risk (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2021 USD ($) loan borrower	Dec. 31, 2020 USD ($) borrower loan	Mar. 31, 2021 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)
Loans and Investments
Loans and investments, gross	$ 7,385,929,000	$ 5,475,082,000
Allowance for credit losses	(138,447,000)	(148,329,000)	$ (147,300,000)	$ (152,811,000)	$ (142,252,000)	$ (152,811,000)
Unearned revenue	(33,567,000)	(40,885,000)
Loans and investments, net	$ 7,213,915,000	$ 5,285,868,000
Percent of Total	100.00%	100.00%
Loan Count | loan	405	328
Wtd. Avg. Pay Rate (as a percent)	4.85%	5.23%
Wtd. Avg. Remaining Months to Maturity	20 months 3 days	19 months 6 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	3.00%	4.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	76.00%	77.00%
Credit risk concentration
Loans and Investments
Wtd. Avg. First Dollar LTV Ratio (as percent)	3.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	76.00%
Credit risk concentration | Single-Family Rental
Loans and Investments
Percent of Total	3.00%
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	63.00%
Total assets | Credit risk concentration
Loans and Investments
Loan Count | loan	21	22
Number of different borrowers | borrower	5	5
Total assets | Credit risk concentration | Five Borrowers
Loans and Investments
Concentration risk, percentage	12.00%	12.00%
Bridge loans
Loans and Investments
Loans and investments, gross	$ 6,907,594,000	$ 5,022,509,000
Percent of Total	94.00%	92.00%
Loan Count | loan	360	263
Wtd. Avg. Pay Rate (as a percent)	4.75%	5.09%
Wtd. Avg. Remaining Months to Maturity	18 months 18 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)	75.00%	76.00%
Bridge loans | Single-Family Rental
Loans and Investments
Number of loans under the loan portfolio | loan	77	38
Total loan commitment	$ 533,900,000	$ 309,200,000
Preferred equity investments
Loans and Investments
Loans and investments, gross	$ 224,814,000	$ 224,928,000
Percent of Total	3.00%	4.00%
Loan Count | loan	14	14
Wtd. Avg. Pay Rate (as a percent)	6.39%	7.07%
Wtd. Avg. Remaining Months to Maturity	44 months 21 days	49 months 24 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	64.00%	64.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	90.00%	89.00%
Mezzanine loans
Loans and Investments
Loans and investments, gross	$ 224,107,000	$ 159,242,000
Percent of Total	3.00%	3.00%
Loan Count | loan	29	29
Wtd. Avg. Pay Rate (as a percent)	6.61%	7.40%
Wtd. Avg. Remaining Months to Maturity	36 months 6 days	45 months
Wtd. Avg. First Dollar LTV Ratio (as percent)	27.00%	32.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	83.00%	82.00%
Other loans
Loans and Investments
Loans and investments, gross	$ 29,414,000	$ 68,403,000
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	54 months 6 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)	69.00%	69.00%
Other loans | Single-Family Rental
Loans and Investments
Number of loans under the loan portfolio | loan	2	22
Unpaid principal balance, funded	$ 191,500,000	$ 88,100,000
Transfer of fixed rate SFR from Structured Business to Agency Business			21
Transfer of UPB from Structured Business To Agency Business			$ 65,200,000

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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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Represents a category of loans on real estate expressed as a percentage of total loans on 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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Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements.

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