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Loans and Investments, Investment Portfolio and Concentration of Credit Risk (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) item loan	Dec. 31, 2018 USD ($) item loan	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Loans and Investments
Loans and investments, gross	$ 4,279,611	$ 3,283,342
Allowance for loan losses	(71,069)	(71,069)	$ (62,783)	$ (83,712)
Unearned revenue	(18,582)	(12,128)
Loans and investments, net	$ 4,189,960	$ 3,200,145
Percent of Total	100.00%	100.00%
Loan Count | loan	272	190
Wtd. Avg. Pay Rate (as a percent)	5.98%	7.02%
Wtd. Avg. Remaining Months to Maturity	22 months 3 days	22 months
Wtd. Avg. First Dollar LTV Ratio (as percent)	4.00%	5.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	76.00%	75.00%
Number of loans and investments | loan	8	8
Carrying value of loans	$ 4,279,611
Higher-risk
Loans and Investments
Wtd. Avg. Last Dollar LTV Ratio (as percent)	98.00%	99.00%
Carrying value of loans	$ 127,600	$ 128,700
Total assets | Credit risk concentration
Loans and Investments
Loan Count | loan	24	45
Number of different borrowers | item	5	5
Concentration risk, percentage	13.00%	22.00%
Bridge loans
Loans and Investments
Loans and investments, gross	$ 3,836,832	$ 2,992,814
Percent of Total	90.00%	91.00%
Loan Count | loan	217	167
Wtd. Avg. Pay Rate (as a percent)	5.77%	6.84%
Wtd. Avg. Remaining Months to Maturity	18 months	18 months 15 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	75.00%	74.00%
Carrying value of loans	$ 3,836,832
Bridge loans | Single-Family Rental
Loans and Investments
Number of loans under the loan portfolio | loan	11
Total loan commitment	$ 66,700
Unpaid principal balance, funded	$ 30,000
Bridge loans | Purchased Loans [Member]
Loans and Investments
Number of loans under the loan portfolio | loan	9
Mezzanine loans
Loans and Investments
Loans and investments, gross	$ 191,575	$ 108,867
Percent of Total	4.00%	3.00%
Loan Count | loan	24	13
Wtd. Avg. Pay Rate (as a percent)	9.70%	10.57%
Wtd. Avg. Remaining Months to Maturity	36 months 21 days	22 months 3 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	22.00%	28.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	73.00%	72.00%
Preferred equity investments
Loans and Investments
Loans and investments, gross	$ 181,058	$ 181,661
Percent of Total	4.00%	6.00%
Loan Count | loan	10	10
Wtd. Avg. Pay Rate (as a percent)	7.62%	7.97%
Wtd. Avg. Remaining Months to Maturity	68 months 24 days	78 months
Wtd. Avg. First Dollar LTV Ratio (as percent)	69.00%	66.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	89.00%	89.00%
Carrying value of loans			$ 34,800
Other
Loans and Investments
Loans and investments, gross	$ 70,146
Percent of Total	2.00%
Loan Count | loan	21
Wtd. Avg. Pay Rate (as a percent)	2.88%
Wtd. Avg. Remaining Months to Maturity	84 months 24 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	70.00%
Other | Single-Family Rental
Loans and Investments
Number of loans under the loan portfolio | loan	12
Total loan commitment	$ 41,600
Other | Purchased Loans [Member]
Loans and Investments
Total loan commitment	$ 28,600

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- Definition

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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Unearned discounts (other than cash or quantity discounts and the like), finance charges, and interest included in the face amount of receivables, that are shown as a deduction from the related receivables. For example, 1) finance charges booked as a receivable when a loan is made and recognized as income at a later date; and 2) interest charges deducted from the face loan amount, resulting in a discounted amount actually advanced to the borrower (wherein the receivable includes the amount actually advanced to the borrower and the as yet unearned interest income).

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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 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, before allowance for credit loss, of financing receivable.

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