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Securities (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Mar. 31, 2014 Residential mortgage-backed security (RMBS) item | Dec. 31, 2013 Residential mortgage-backed security (RMBS) item | Sep. 30, 2014 CDO bond and CMBS investments item | Dec. 31, 2013 CDO bond and CMBS investments item | Dec. 31, 2013 CDO bond and CMBS investments AA+ item | Dec. 31, 2013 CDO bond and CMBS investments CCC item | Sep. 30, 2014 CDO bond and CMBS investments CCC- item | Dec. 31, 2013 CDO bond and CMBS investments CCC- item | Dec. 31, 2013 CDO bond and CMBS investments NR item | Sep. 30, 2014 Commercial mortgage-backed security (CMBS) | Dec. 31, 2013 Commercial mortgage-backed security (CMBS) | Sep. 30, 2014 Common Stock | Dec. 31, 2013 Common Stock | Sep. 30, 2014 Available-for-sale Securities | Sep. 30, 2013 Available-for-sale Securities | Sep. 30, 2014 Available-for-sale Securities | Sep. 30, 2013 Available-for-sale Securities | Sep. 30, 2014 Available-for-sale Securities Realty Finance Corporation | Dec. 31, 2013 Available-for-sale Securities Realty Finance Corporation | Mar. 31, 2014 Available-for-sale Securities Residential mortgage-backed security (RMBS) item | Sep. 30, 2014 Available-for-sale Securities Commercial mortgage-backed security (CMBS) | Dec. 31, 2013 Available-for-sale Securities Commercial mortgage-backed security (CMBS) | Dec. 31, 2010 Available-for-sale Securities Commercial mortgage-backed security (CMBS)
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face Value | $ 2,100,000 |  | $ 2,100,000 |  | $ 41,113,690 |  | $ 39,013,690 |  |  |  |  |  |  |  | $ 2,100,000 | $ 2,100,000 |  |  |  |  |  |  |  |  |  |  |  |
Amortized Cost | 2,158,789 |  | 2,158,789 |  | 36,208,099 |  | 34,049,310 | 2,100,000 | 36,149,310 | 93,715 | 18,417,402 | 2,100,000 | 2,100,000 | 15,538,193 | 2,100,000 | 2,100,000 | 58,789 | 58,789 |  |  |  |  |  |  |  |  |  |
Cumulative Unrealized Gain | 370,315 |  | 370,315 |  | 1,113,851 |  | 437,774 |  |  |  |  |  |  |  | (100,000) |  | 470,315 | 676,077 |  |  |  |  |  |  | 400,000 |  |  |
Cumulative Unrealized Loss |  |  |  |  | (6,298) |  | (6,298) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value / Estimated Fair Value | 2,529,104 |  | 2,529,104 |  | 37,315,652 |  | 34,480,786 |  |  |  |  |  |  |  | 2,000,000 | 2,100,000 | 529,104 | 734,866 |  |  |  |  | 500,000 | 700,000 | 33,400,000 | 2,000,000 | 2,100,000 |
Principal paydowns of loan sold |  |  | (694,560,068) | (199,325,600) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of investments acquired with deteriorated credit quality had accretable yields |  |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate carrying value of investment with deteriorated credit quality |  |  |  |  |  | 25,800,000 | 25,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of securities |  |  | 33,904,172 | 2,100,000 |  | 25,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,900,000 |  |  |
Gain on sale of securities |  |  | 518,640 | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |
Number of securities |  |  |  |  |  |  |  | 1 | 10 | 1 | 1 | 1 | 1 | 7 |  |  |  |  |  |  |  |  |  |  | 2 |  |  |
Investments financed with a repurchase agreement with a financial institution |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,300,000 |  |  |
Percent of Total |  |  |  |  |  |  |  | 100.00% | 100.00% |  | 51.00% | 100.00% | 6.00% | 43.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,100,000
Base rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR | LIBOR |
Interest spread (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.89% | 0.89% |
Stated maturity period (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |
Estimated remaining life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |
Number of shares of common stock purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,939,465 |  |  |  |  |
Impairment charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |
Weighted average yield (as a percent) | 1.13% | 3.72% | 1.90% | 4.05% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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