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Loans and Investments (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014 item	Dec. 31, 2013 item	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Loans and Investments
Loans and investments, gross	$ 1,655,918,364	$ 1,660,195,301
Unearned revenue	(12,889,851)	(14,218,237)
Allowance for loan losses	(116,386,526)	(122,277,411)	(115,059,988)	(143,018,491)	(146,563,765)	(161,706,313)
Loans and investments, net	1,526,641,987	1,523,699,653
Percent of Total	100.00%	100.00%
Loan Count	143	144
Wtd. Avg. Pay Rate (as a percent)	5.41%	5.26%
Wtd. Avg. Remaining Months to Maturity	21 months	23 months 15 days
First Dollar LTV Ratio (as percent)	16.00%	17.00%
Last Dollar LTV Ratio (as percent)	76.00%	77.00%
Number of portfolio segments	1
Higher credit risk
Loans and Investments
Loans and investments, gross	186,800,000	187,500,000
Last Dollar LTV Ratio (as percent)	93.00%	93.00%
Credit risk concentration
Loans and Investments
Loans and investments, gross	1,655,918,364	1,660,195,301
Percent of Total	100.00%	100.00%
First Dollar LTV Ratio (as percent)	16.00%	17.00%
Last Dollar LTV Ratio (as percent)	76.00%	77.00%
Credit risk concentration | Minimum
Loans and Investments
Credit risk individual ratings	1
Credit risk concentration | Maximum
Loans and Investments
Credit risk individual ratings	5
Credit risk concentration | Risk rating, three
Loans and Investments
Credit risk individual ratings	3
Credit risk concentration | Risk rating, four
Loans and Investments
Credit risk individual ratings	4
Credit risk concentration | Risk rating, five
Loans and Investments
Credit risk individual ratings	5
Credit risk concentration | Risk rating, 3.5
Loans and Investments
Credit risk individual ratings	3.5
Credit risk concentration | Risk rating, 4.5
Loans and Investments
Credit risk individual ratings	4.5
Total assets | Credit risk concentration
Loans and Investments
Loan Count	24	28
Number of different borrowers	5	5
Concentration risk, percentage	24.00%	30.00%
Bridge Loans
Loans and Investments
Loans and investments, gross	1,213,584,295	1,171,783,914
Percent of Total	73.00%	71.00%
Loan Count	98	95
Wtd. Avg. Pay Rate (as a percent)	5.25%	5.11%
Wtd. Avg. Remaining Months to Maturity	16 months 24 days	18 months 15 days
First Dollar LTV Ratio (as percent)	0.00%	0.00%
Last Dollar LTV Ratio (as percent)	74.00%	76.00%
Mezzanine Loans
Loans and Investments
Loans and investments, gross	90,762,106	118,550,172
Percent of Total	6.00%	7.00%
Loan Count	22	27
Wtd. Avg. Pay Rate (as a percent)	9.15%	7.02%
Wtd. Avg. Remaining Months to Maturity	39 months 18 days	58 months 6 days
First Dollar LTV Ratio (as percent)	50.00%	56.00%
Last Dollar LTV Ratio (as percent)	81.00%	83.00%
Junior Participations Loans
Loans and Investments
Loans and investments, gross	199,106,125	248,337,542
Percent of Total	12.00%	15.00%
Loan Count	5	7
Wtd. Avg. Pay Rate (as a percent)	4.52%	4.21%
Wtd. Avg. Remaining Months to Maturity	15 months 18 days	19 months 18 days
First Dollar LTV Ratio (as percent)	62.00%	60.00%
Last Dollar LTV Ratio (as percent)	80.00%	81.00%
Preferred equity investments
Loans and Investments
Loans and investments, gross	$ 152,465,838	$ 121,523,673
Percent of Total	9.00%	7.00%
Loan Count	18	15
Wtd. Avg. Pay Rate (as a percent)	5.68%	7.20%
Wtd. Avg. Remaining Months to Maturity	50 months	45 months 15 days
First Dollar LTV Ratio (as percent)	63.00%	58.00%
Last Dollar LTV Ratio (as percent)	84.00%	79.00%

X

- Definition

Represents the number of portfolio segments of financing receivables.

+ References

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- Definition

Represents the 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.

+ References

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- Definition

Represents the individual ratings assigned to credit risk during the loan valuation and risk assessment process.

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- Definition

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.

+ References

No definition available.

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X

- Definition

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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- Definition

Represents the number of unrelated borrowers.

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- Definition

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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- Definition

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

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- Definition

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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- Definition

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

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- Definition

Indicates the number of mortgages under each classification.

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