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Loans and Investments, Investment Portfolio and Concentration of Credit Risk (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) borrower loan	Dec. 31, 2017 USD ($) borrower loan	Jun. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Loans and Investments
Loans and investments, gross	$ 3,170,117	$ 2,652,538
Unearned revenue	(11,477)	(10,628)
Allowance for loan losses	(60,951)	(62,783)	$ (58,733)	$ (83,256)	$ (81,256)	$ (83,712)
Loans and investments, net	$ 3,097,689	$ 2,579,127
Percent of Total	100.00%	100.00%
Loan Count | loan	191	170
Wtd. Avg. Pay Rate (as a percent)	6.88%	6.28%
Wtd. Avg. Remaining Months to Maturity	22 months	23 months 18 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	4.00%	4.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	74.00%	73.00%
Number of loans and investments | loan	8	8
Higher-risk
Loans and Investments
Wtd. Avg. Last Dollar LTV Ratio (as percent)	92.00%	93.00%
Carrying value of loans	$ 128,700	$ 126,500
Total assets | Credit risk concentration
Loans and Investments
Loan Count | loan	48	42
Number of different borrowers | borrower	5	5
Concentration risk, percentage	23.00%	24.00%
Bridge loans
Loans and Investments
Loans and investments, gross	$ 2,919,582	$ 2,422,105
Percent of Total	92.00%	91.00%
Loan Count | loan	170	150
Wtd. Avg. Pay Rate (as a percent)	6.70%	6.10%
Wtd. Avg. Remaining Months to Maturity	19 months 18 days	20 months 27 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	74.00%	72.00%
Preferred equity investments
Loans and Investments
Loans and investments, gross	$ 154,202	$ 142,892
Percent of Total	5.00%	6.00%
Loan Count | loan	10	12
Wtd. Avg. Pay Rate (as a percent)	8.18%	6.47%
Wtd. Avg. Remaining Months to Maturity	70 months 15 days	68 months 21 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	62.00%	64.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	87.00%	90.00%
Mezzanine loans
Loans and Investments
Loans and investments, gross	$ 96,333	$ 87,541
Percent of Total	3.00%	3.00%
Loan Count | loan	11	8
Wtd. Avg. Pay Rate (as a percent)	10.49%	10.78%
Wtd. Avg. Remaining Months to Maturity	19 months 15 days	24 months 24 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	25.00%	20.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	71.00%	63.00%

X

- 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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Represents the number of loans and investments.

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Represents the number of unrelated borrowers.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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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 before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans 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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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.

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