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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% |  |  |  |

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. + References No definition available. + Details
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- Definition Represents the individual ratings assigned to credit risk during the loan valuation and risk assessment process. + References No definition available. + Details
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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. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4519-111522 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5066-111524 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 + Details
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