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Loans and Investments, Risk Ratings and LTV Ratios (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Loans and Investments |  |
Percentage of Portfolio | 100.00% | 100.00%
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 concentration | Pass/watch |  |
Loans and Investments |  |
Unpaid Principal Balance | $ 2,094,376,123 |
Percentage of Portfolio | 100.00% |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 7.00% |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 74.00% |
Credit risk concentration | Special mention |  |
Loans and Investments |  |
Unpaid Principal Balance |  | $ 1,790,159,966
Percentage of Portfolio |  | 100.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) |  | 6.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) |  | 75.00%
Credit risk concentration | Loans and investments portfolio | New York |  |
Loans and Investments |  |
Concentration risk, percentage | 20.00% | 25.00%
Credit risk concentration | Loans and investments portfolio | Texas |  |
Loans and Investments |  |
Concentration risk, percentage | 16.00% | 13.00%
Credit risk concentration | Loans and investments portfolio | California |  |
Loans and Investments |  |
Concentration risk, percentage | 11.00% | 15.00%
Credit risk concentration | Loans and investments portfolio | Georgia |  |
Loans and Investments |  |
Concentration risk, percentage | 8.00% |
Credit risk concentration | Loans and investments portfolio | Florida |  |
Loans and Investments |  |
Concentration risk, percentage |  | 14.00%
Credit risk concentration | Multifamily | Pass/watch |  |
Loans and Investments |  |
Unpaid Principal Balance | $ 1,556,114,399 |
Percentage of Portfolio | 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 | Multifamily | Special mention |  |
Loans and Investments |  |
Unpaid Principal Balance |  | $ 1,421,731,108
Percentage of Portfolio |  | 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 | Land | Substandard |  |
Loans and Investments |  |
Unpaid Principal Balance | $ 140,054,798 | $ 137,255,369
Percentage of Portfolio | 7.00% | 8.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) | 0.00% | 2.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 88.00% | 92.00%
Credit risk concentration | Office | Pass/watch |  |
Loans and Investments |  |
Unpaid Principal Balance | $ 133,143,446 | $ 141,710,156
Percentage of Portfolio | 6.00% | 8.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) | 19.00% | 43.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 71.00% | 73.00%
Credit risk concentration | Hotel | Special mention |  |
Loans and Investments |  |
Unpaid Principal Balance | $ 90,725,147 | $ 70,750,000
Percentage of Portfolio | 4.00% | 4.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) | 39.00% | 30.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 83.00% | 74.00%
Credit risk concentration | Retail | Pass/watch |  |
Loans and Investments |  |
Unpaid Principal Balance | $ 36,483,333 |
Percentage of Portfolio | 2.00% |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 8.00% |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 66.00% |
Credit risk concentration | Retail | Special mention |  |
Loans and Investments |  |
Unpaid Principal Balance |  | $ 3,958,333
Percentage of Portfolio |  | 1.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) |  | 81.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) |  | 91.00%
Credit risk concentration | Commercial | Special mention |  |
Loans and Investments |  |
Unpaid Principal Balance |  | $ 9,205,000
Percentage of Portfolio |  | 1.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) |  | 12.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) |  | 69.00%
Credit risk concentration | Commercial | Pass |  |
Loans and Investments |  |
Unpaid Principal Balance | $ 133,230,000 |
Percentage of Portfolio | 6.00% |
Wtd. Avg. First Dollar LTV Ratio (as percent) | 1.00% |
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 71.00% |
Credit risk concentration | Healthcare | Special mention |  |
Loans and Investments |  |
Unpaid Principal Balance | $ 4,625,000 | $ 5,550,000
Percentage of Portfolio | 1.00% | 1.00%
Wtd. Avg. First Dollar LTV Ratio (as percent) | 0.00% | 0.00%
Wtd. Avg. Last Dollar LTV Ratio (as percent) | 73.00% | 63.00%

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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. + 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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