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Loans and Investments - Investment Portfolio and Concentration of Credit Risk (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) loan borrower	Dec. 31, 2019 USD ($) loan borrower	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)
Loans and Investments
Loans and investments, gross	$ 4,972,138	$ 4,279,611
Unearned revenue	(19,151)	(18,582)
Loans and investments, net	4,800,176	4,189,960
Allowance for credit losses	$ (152,811)	$ (71,069)	$ (142,252)	$ (71,069)
Percent of Total	100.00%	100.00%
Loan Count | loan	294	272
Wtd. Avg. Pay Rate (as a percent)	5.57%	5.98%
Wtd. Avg. Remaining Months to Maturity	20 months 6 days	22 months 3 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	4.00%	4.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	78.00%	76.00%
Credit risk concentration
Loans and Investments
Amortized cost basis	$ 4,972,138
Allowance for credit losses - CECL	$ 4,972,138
Wtd. Avg. First Dollar LTV Ratio (as percent)	4.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	78.00%
Credit risk concentration | Single-Family Rental
Loans and Investments
Amortized cost basis	$ 101,963
Allowance for credit losses - CECL	$ 101,963
Percent of Total	2.00%
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	75.00%
Total assets | Credit risk concentration
Loans and Investments
Loan Count | loan	23	24
Number of different borrowers | borrower	5	5
Concentration risk, percentage	13.00%	13.00%
Bridge loans
Loans and Investments
Loans and investments, gross	$ 4,504,232	$ 3,836,832
Percent of Total	91.00%	90.00%
Loan Count | loan	234	217
Wtd. Avg. Pay Rate (as a percent)	5.37%	5.77%
Wtd. Avg. Remaining Months to Maturity	16 months 18 days	18 months
Wtd. Avg. First Dollar LTV Ratio (as percent)	1.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	77.00%	75.00%
Bridge loans | Single-Family Rental
Loans and Investments
Number of loans under the loan portfolio | loan	5	11
Total loan commitment	$ 53,400	$ 66,700
Preferred equity investments
Loans and Investments
Loans and investments, gross	$ 216,934	$ 181,058
Percent of Total	4.00%	4.00%
Loan Count | loan	12	10
Wtd. Avg. Pay Rate (as a percent)	8.33%	7.62%
Wtd. Avg. Remaining Months to Maturity	53 months 9 days	68 months 24 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	67.00%	69.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	89.00%	89.00%
Mezzanine loans
Loans and Investments
Loans and investments, gross	$ 170,917	$ 191,575
Percent of Total	3.00%	4.00%
Loan Count | loan	28	24
Wtd. Avg. Pay Rate (as a percent)	7.78%	9.70%
Wtd. Avg. Remaining Months to Maturity	46 months 27 days	36 months 21 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	28.00%	22.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	78.00%	73.00%
Other
Loans and Investments
Loans and investments, gross	$ 80,055	$ 70,146
Percent of Total	2.00%	2.00%
Loan Count | loan	20	21
Wtd. Avg. Pay Rate (as a percent)	5.10%	2.88%
Wtd. Avg. Remaining Months to Maturity	73 months 24 days	84 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%	70.00%
Other | Single-Family Rental
Loans and Investments
Number of loans under the loan portfolio | loan	19	12
Total loan commitment	$ 73,700	$ 41,600
Unpaid principal balance, funded	$ 28,300	$ 30,000
Other | Purchased Loans [Member]
Loans and Investments
Number of loans under the loan portfolio | loan	1	9
Total loan commitment	$ 6,400	$ 28,600

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

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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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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 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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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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