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Schedule IV-Mortgage Loans on Real Estate (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
property
loan
Dec. 31, 2015
USD ($)
Mortgage Loans on Real Estate    
Face Amount $ 5,988,254 $ 6,335,023
Carrying Amount $ 5,946,274 $ 6,263,517
Weighted average spread of loans (as a percent) 5.50%  
Principal Amount of Delinquent Loans $ 209,160  
Aggregate cost for federal income tax purposes 5,900,000  
Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Loan loss allowance (9,788)  
Prepaid Loan Costs, Net (2,698)  
Office, New York City, NY - 1 | Individually Significant First Mortgages    
Mortgage Loans on Real Estate    
Face Amount 150,000  
Carrying Amount $ 149,275  
Office, New York City, NY - 1 | Individually Significant First Mortgages | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 1.70%  
Office, New York City, NY - 2 | Individually Significant First Mortgages    
Mortgage Loans on Real Estate    
Face Amount $ 100,000  
Carrying Amount $ 99,523  
Office, New York City, NY - 2 | Individually Significant First Mortgages | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 3.40%  
Hospitality , Midwest , Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 48,773  
Number of loans | loan 4  
Hospitality , Midwest , Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.75%  
Hospitality , Midwest , Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 9.13%  
Hospitality , Midwest , Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 16,653  
Number of loans | loan 2  
Hospitality , Midwest , Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 8.11%  
Hospitality, North East, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 44,879  
Number of loans | loan 2  
Hospitality, North East, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 4.00%  
Hospitality, North East, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 5.40%  
Hospitality, South East, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 79,887  
Number of loans | property 2  
Hospitality, South East, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.75%  
Hospitality, South East, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 11.15%  
Hospitality, South East, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 57,012  
Number of loans | loan 5  
Hospitality, South East, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 3.49%  
Hospitality, South East, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 10.00%  
Hospitality, Various, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 278,169  
Number of loans | loan 5  
Hospitality, Various, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.40%  
Hospitality, Various, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 9.90%  
Hospitality, Various, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 152,201  
Number of loans | loan 4  
Hospitality, Various, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 7.50%  
Hospitality, Various, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 11.13%  
Hospitality, West, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 491,761  
Number of loans | loan 18  
Hospitality, West, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.25%  
Hospitality, West, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 14.00%  
Industrial, North East, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 80  
Interest rate (as a percent) 7.45%  
Number of loans | loan 1  
Industrial, South East, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 28,298  
Interest Rate, Fixed, Minimum (as a percent) 7.80%  
Interest Rate, Fixed, Maximum (as a percent) 8.18%  
Number of loans | loan 6  
Industrial, South East, Fixed | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 66,861  
Interest rate (as a percent) 8.18%  
Number of loans | loan 8  
Mixed Use, North East, Floating | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 11.34%  
Mixed Use, North East, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 308,318  
Number of loans | property 6  
Mixed Use, North East, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.75%  
Mixed Use, North East, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 112,999  
Number of loans | loan 2  
Mixed Use, North East, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 10.00%  
Mixed Use, North East, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 11.75%  
Mixed Use, South East, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 114,799  
Interest Rate, Fixed, Minimum (as a percent) 5.00%  
Interest Rate, Fixed, Maximum (as a percent) 12.00%  
Number of loans | loan 2  
Mixed Use, South West, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 218,023  
Number of loans | loan 6  
Mixed Use, South West, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.25%  
Mixed Use, South West, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 10.00%  
Mixed Use, West, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 105,774  
Number of loans | loan 4  
Mixed Use, West, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 1.00%  
Mixed Use, West, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 7.50%  
Mixed Use, International, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 17,684  
Number of loans | loan 1  
Mixed Use, International, Floating | Aggregated First Mortgages | 1-month GBP LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 5.75%  
Multi Family, Midwest, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 1,401  
Interest rate (as a percent) 6.54%  
Number of loans | loan 1  
Multi-Family, North East, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 403,080  
Principal Amount of Delinquent Loans $ 209,160  
Number of loans | loan 11  
Multi-Family, North East, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.50%  
Multi-Family, North East, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 15.00%  
Multi-Family, North East, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 14,483  
Number of loans | loan 1  
Multi-Family, North East, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 8.35%  
Multi Family, South East, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 2,053  
Interest rate (as a percent) 6.28%  
Number of loans | loan 1  
Multi Family, South East, Fixed | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 2,834  
Interest rate (as a percent) 5.47%  
Number of loans | loan 1  
Multi Family, South East, Fixed | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 9.08%  
Multi-Family, West, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 137,991  
Number of loans | loan 19  
Multi-Family, West, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 1.15%  
Multi-Family, West, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 9.25%  
Multi-Family, West, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 100,147  
Number of loans | loan 1  
Multi-Family, West, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 10.13%  
Multi-family, International, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 18,431  
Interest rate (as a percent) 8.55%  
Number of loans | loan 1  
Multi-family, International, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 86,384  
Number of loans | loan 1  
Multi-family, International, Floating | Aggregated First Mortgages | 1-month GBP LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 7.65%  
Multi-family, International, Floating 2 | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 101,013  
Number of loans | loan 2  
Multi-family, International, Floating 2 | Aggregated First Mortgages | 3-month LIBOR GBP    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 7.00%  
Office, Mid Atlantic, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 46,514  
Interest rate (as a percent) 5.25%  
Number of loans | loan 1  
Office, Mid Atlantic, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 119,656  
Number of loans | loan 3  
Office, Mid Atlantic, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.25%  
Office, Mid Atlantic, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 11.25%  
Office, Midwest, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 161,046  
Number of loans | loan 13  
Office, Midwest, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.25%  
Office, Midwest, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 10.58%  
Office, Midwest, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 60,455  
Number of loans | loan 6  
Office, Midwest, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 8.25%  
Office, Midwest, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 9.00%  
Office, North East, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 62,338  
Interest Rate, Fixed, Minimum (as a percent) 6.35%  
Interest Rate, Fixed, Maximum (as a percent) 11.00%  
Number of loans | loan 2  
Office, North East, Fixed | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 56,707  
Interest Rate, Fixed, Minimum (as a percent) 6.79%  
Interest Rate, Fixed, Maximum (as a percent) 8.72%  
Number of loans | loan 4  
Office, North East, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 833,384  
Number of loans | loan 26  
Office, North East, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.00%  
Office, North East, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 12.00%  
Office, North East, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 68,083  
Number of loans | loan 3  
Office, North East, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 8.00%  
Office, North East, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 10.25%  
Office , South East , Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 91,461  
Number of loans | loan 4  
Office , South East , Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.25%  
Office , South East , Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 8.05%  
Office , South East , Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 26,875  
Number of loans | loan 1  
Office , South East , Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 9.50%  
Office, South West, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 135,796  
Number of loans | loan 6  
Office, South West, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.25%  
Office, South West, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 10.70%  
Office, West, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 145,466  
Number of loans | loan 7  
Office, West, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.25%  
Office, West, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 9.75%  
Office, West, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 38,249  
Number of loans | loan 2  
Office, West, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 7.34%  
Other, South East, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 59,164  
Number of loans | loan 2  
Other, South East, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.75%  
Other, South East, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 12.75%  
Other, Various, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 41,632  
Interest rate (as a percent) 10.00%  
Number of loans | loan 1  
Other, International, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 173,621  
Number of loans | loan 1  
Other, International, Floating | Aggregated First Mortgages | 3-month LIBOR GBP | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 4.85%  
Residential, West, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 66,243  
Number of loans | loan 1  
Residential, West, Floating | Aggregated First Mortgages | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 5.25%  
Residential, West, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 44,142  
Number of loans | loan 1  
Residential, West, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 7.89%  
Retail , Mid Atlantic , Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 497  
Interest rate (as a percent) 7.07%  
Number of loans | loan 1  
Retail, Midwest, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 121  
Interest rate (as a percent) 10.25%  
Number of loans | loan 1  
Retail, Midwest, Fixed | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 11,977  
Interest rate (as a percent) 7.16%  
Number of loans | loan 2  
Retail , Midwest ,Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 32,415  
Number of loans | loan 4  
Retail , Midwest ,Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.75%  
Retail , Midwest ,Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 10.75%  
Retail , Midwest ,Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 8,289  
Number of loans | loan 1  
Retail , Midwest ,Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 8.85%  
Retail, North East, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 3,080  
Interest Rate, Fixed, Minimum (as a percent) 5.74%  
Interest Rate, Fixed, Maximum (as a percent) 7.07%  
Number of loans | loan 2  
Retail, North East, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 64,913  
Number of loans | loan 8  
Retail, North East, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.25%  
Retail, North East, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 8.05%  
Retail, South East, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 18,531  
Interest Rate, Fixed, Minimum (as a percent) 6.64%  
Interest Rate, Fixed, Maximum (as a percent) 10.00%  
Number of loans | loan 4  
Retail, South West, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 3,070  
Interest Rate, Fixed, Minimum (as a percent) 6.03%  
Interest Rate, Fixed, Maximum (as a percent) 8.04%  
Number of loans | loan 5  
Retail, South West, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 52,311  
Number of loans | loan 4  
Retail, South West, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.25%  
Retail, South West, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 15.25%  
Retail, South West, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 4,600  
Number of loans | loan 1  
Retail, South West, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month GBP LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 8.85%  
Retail, Various, Floating | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 11,167  
Number of loans | loan 2  
Retail, Various, Floating | Aggregated First Mortgages | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 2.25%  
Retail, Various, Floating | Aggregated First Mortgages | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 9.25%  
Retail, Various, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 1,016  
Number of loans | loan 1  
Retail, Various, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 8.85%  
Retail, West, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 10,639  
Interest Rate, Fixed, Minimum (as a percent) 5.82%  
Interest Rate, Fixed, Maximum (as a percent) 7.53%  
Number of loans | loan 7  
Other, South East, Fixed | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 4,494  
Interest rate (as a percent) 12.02%  
Number of loans | loan 1  
Multi Family, Mid Atlantic, Fixed | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 2,977  
Interest rate (as a percent) 10.50%  
Number of loans | loan 1  
Multi-family, Mid Atlantic, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 9,856  
Number of loans | loan 2  
Multi-family, South East, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 15,107  
Number of loans | loan 1  
Multi-family, South East, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 9.46%  
Office, South East, Fixed | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 7,655  
Interest rate (as a percent) 8.25%  
Number of loans | loan 1  
Office, South West, Fixed | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 57,575  
Interest Rate, Fixed, Minimum (as a percent) 5.92%  
Interest Rate, Fixed, Maximum (as a percent) 6.13%  
Number of loans | loan 3  
Other, Midwest, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 27,000  
Number of loans | loan 2  
Other, Midwest, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 10.67%  
Other, West, Floating | Aggregated Subordinated and Mezzanine Loans    
Mortgage Loans on Real Estate    
Carrying Amount $ 58,573  
Number of loans | loan 2  
Other, West, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Minimum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 6.10%  
Other, West, Floating | Aggregated Subordinated and Mezzanine Loans | 1-month LIBOR | Maximum    
Mortgage Loans on Real Estate    
Weighted average spread of loans (as a percent) 10.08%  
Loans Held-for-Sale, Various, Fixed | Aggregated First Mortgages    
Mortgage Loans on Real Estate    
Carrying Amount $ 63,279  
Interest Rate, Fixed, Minimum (as a percent) 5.12%  
Interest Rate, Fixed, Maximum (as a percent) 5.53%