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Loans and Investments (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($) item borrower loan	Dec. 31, 2016 USD ($) borrower loan	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Loans and Investments
Loans and investments, gross	$ 2,094,376,123	$ 1,790,159,966
Allowance for loan losses	(83,255,922)	(83,711,575)	$ (81,255,922)	$ (83,816,575)	$ (83,831,575)	$ (86,761,575)
Unearned revenue	(13,564,216)	(10,716,040)
Loans and investments, net	$ 1,997,555,985	$ 1,695,732,351
Percent of Total	100.00%	100.00%
Loan Count | loan	149	144
Wtd. Avg. Pay Rate (as a percent)	6.04%	5.71%
Wtd. Avg. Remaining Months to Maturity	22 months 21 days	16 months 9 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	7.00%	6.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	74.00%	75.00%
Credit risk individual ratings | item	5
Higher-risk
Loans and Investments
Wtd. Avg. Last Dollar LTV Ratio (as percent)	94.00%	95.00%
Carrying value of loans before loan loss reserves	$ 147,500,000	$ 150,500,000
Credit risk concentration | Minimum
Loans and Investments
Credit risk individual ratings | item	1
Credit risk concentration | Maximum
Loans and Investments
Credit risk individual ratings | item	5
Credit risk concentration | Pass
Loans and Investments
Credit risk individual ratings | item	1
Credit risk concentration | Pass/watch
Loans and Investments
Percent of Total	100.00%
Wtd. Avg. First Dollar LTV Ratio (as percent)	7.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	74.00%
Credit risk individual ratings | item	2
Credit risk concentration | Pass/watch | Multifamily
Loans and Investments
Percent of Total	75.00%
Wtd. Avg. First Dollar LTV Ratio (as percent)	5.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	73.00%
Credit risk concentration | Special mention
Loans and Investments
Percent of Total		100.00%
Wtd. Avg. First Dollar LTV Ratio (as percent)		6.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)		75.00%
Credit risk individual ratings | item	3
Credit risk concentration | Special mention | Multifamily
Loans and Investments
Percent of Total		79.00%
Wtd. Avg. First Dollar LTV Ratio (as percent)		1.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)		73.00%
Credit risk concentration | Substandard
Loans and Investments
Credit risk individual ratings | item	4
Credit risk concentration | Doubtful
Loans and Investments
Credit risk individual ratings | item	5
Total assets | Credit risk concentration
Loans and Investments
Loan Count | loan	32	35
Number of different borrowers | borrower	5	5
Concentration risk, percentage	15.00%	16.00%
Bridge loans
Loans and Investments
Loans and investments, gross	$ 1,841,484,888	$ 1,602,658,179
Percent of Total	88.00%	90.00%
Loan Count | loan	129	120
Wtd. Avg. Pay Rate (as a percent)	5.89%	5.59%
Wtd. Avg. Remaining Months to Maturity	19 months	16 months 12 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	0.00%	0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	72.00%	73.00%
Carrying value of loans before loan loss reserves	$ 4,800,000			$ 4,800,000
Preferred equity investments
Loans and Investments
Loans and investments, gross	$ 155,306,620	$ 68,120,639
Percent of Total	7.00%	4.00%
Loan Count | loan	11	10
Wtd. Avg. Pay Rate (as a percent)	6.92%	6.83%
Wtd. Avg. Remaining Months to Maturity	68 months 9 days	23 months 24 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	62.00%	42.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	88.00%	91.00%
Carrying value of loans before loan loss reserves	$ 34,800,000
Mezzanine loans
Loans and Investments
Loans and investments, gross	$ 72,328,033	$ 57,124,566
Percent of Total	4.00%	3.00%
Loan Count | loan	8	12
Wtd. Avg. Pay Rate (as a percent)	10.24%	9.09%
Wtd. Avg. Remaining Months to Maturity	26 months 27 days	17 months 27 days
Wtd. Avg. First Dollar LTV Ratio (as percent)	29.00%	36.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	69.00%	75.00%
Junior participation loans
Loans and Investments
Loans and investments, gross	$ 25,256,582	$ 62,256,582
Percent of Total	1.00%	3.00%
Loan Count | loan	1	2
Wtd. Avg. Pay Rate (as a percent)		4.50%
Wtd. Avg. Remaining Months to Maturity	0 months	4 months
Wtd. Avg. First Dollar LTV Ratio (as percent)	100.00%	83.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent)	100.00%	84.00%

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- 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 unrelated borrowers.

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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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The carrying amount of the outstanding balance due under the mortgage loan.

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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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The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

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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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Indicates the number of mortgages under each classification.

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