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Schedule IV Mortgage Loans on Real Estate (Details)
 12 Months Ended
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Mortgage Loans on Real Estate        
Principal balance       $ 2,676,231,000
Fair Value $ 2,493,238,000 $ 2,493,238,000 $ 216,361,000 2,691,532,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       19,233,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Beginning balance 2,493,238,000 368,972,000 216,361,000  
Unrealized gains 2,042,587,000 2,901,479,000 232,545,000  
Unrealized gains 21,291,000 631,000 3,167,000  
Collections of principal 1,858,659,000 769,748,000 80,550,000  
Amortization of premium and (discounts) 5,247,000 5,692,000 1,470,000  
Unrealized losses 1,191,000 2,356,000 1,081,000  
Realized losses 487,000 48,000 0  
Balance at end of period $ 2,691,532,000 $ 2,493,238,000 $ 368,972,000  
Original Loan Amount 25,000,000        
Mortgage Loans on Real Estate        
Coupon Rate 9.00%      
Principal balance       25,000,000
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $0 - $249,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 4.50%      
Principal balance       0
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $0 - $249,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 6.00%      
Principal balance       249,999
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $250,000 - $499,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 4.50%      
Principal balance       250,000
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $250,000 - $499,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 6.50%      
Principal balance       499,999
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $500,000- $749,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 4.50%      
Principal balance       500,000
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $500,000- $749,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 6.00%      
Principal balance       749,999
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $750,000 - $999,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 4.50%      
Principal balance       750,000
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $750,000 - $999,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 6.00%      
Principal balance       999,999
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,000,000 - $1,249,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 4.00%      
Principal balance       1,000,000
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,000,000 - $1,249,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 5.90%      
Principal balance       1,249,999
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,250,000 - $1,499,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 4.80%      
Principal balance       1,250,000
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,250,000 - $1,499,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 5.80%      
Principal balance       1,499,999
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,500,000 and above | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 4.80%      
Principal balance       1,500,000
Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,500,000 and above | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 5.90%      
Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $0 - $249,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 5.40%      
Principal balance       0
Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $0 - $249,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 5.80%      
Principal balance       249,999
Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $250,000 - $499,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 4.00%      
Principal balance       250,000
Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $250,000 - $499,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 6.30%      
Principal balance       499,999
Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $500,000- $749,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 5.50%      
Principal balance       500,000
Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $500,000- $749,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 6.10%      
Principal balance       749,999
Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,000,000 - $1,249,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 6.50%      
Principal balance       1,000,000
Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,000,000 - $1,249,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 6.50%      
Principal balance       1,249,999
Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,250,000 - $1,499,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 5.40%      
Principal balance       1,250,000
Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,250,000 - $1,499,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 5.70%      
Principal balance       1,499,999
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $0 - $249,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 3.80%      
Principal balance       0
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $0 - $249,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 8.40%      
Principal balance       249,999
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $250,000 - $499,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 3.80%      
Principal balance       250,000
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $250,000 - $499,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 7.20%      
Principal balance       499,999
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $500,000- $749,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 3.90%      
Principal balance       500,000
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $500,000- $749,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 6.10%      
Principal balance       749,999
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,000,000 - $1,249,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 5.00%      
Principal balance       1,000,000
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,000,000 - $1,249,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 6.30%      
Principal balance       1,249,999
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,250,000 - $1,499,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 5.60%      
Principal balance       1,250,000
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,250,000 - $1,499,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 6.30%      
Principal balance       1,499,999
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,500,000 and above        
Mortgage Loans on Real Estate        
Principal balance       1,500,000
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,500,000 and above | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 8.00%      
Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,500,000 and above | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 10.00%      
Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Balance $25,000,000        
Mortgage Loans on Real Estate        
Period for interest only payments 2 years      
Amortization schedule 2 years      
Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Balance 45,185,500        
Mortgage Loans on Real Estate        
Principal balance       45,187,500
Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 115,500,000        
Mortgage Loans on Real Estate        
Principal balance       115,500,000
Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 5,744,800        
Mortgage Loans on Real Estate        
Principal balance       5,744,800
Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 20,000,000        
Mortgage Loans on Real Estate        
Principal balance       20,000,000
Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 30,000,000        
Mortgage Loans on Real Estate        
Principal balance       30,000,000
Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 1,350,000,000        
Mortgage Loans on Real Estate        
Principal balance       1,350,000,000
Residential Whole-Loan And Residential Bridge Loan | Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $0 - $249,999        
Mortgage Loans on Real Estate        
Number of Loans 730      
Principal balance       120,652,000
Fair Value $ 125,569,000     125,569,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 125,569,000      
Residential Whole-Loan And Residential Bridge Loan | Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $250,000 - $499,999        
Mortgage Loans on Real Estate        
Number of Loans 1,051      
Principal balance       356,183,000
Fair Value $ 370,434,000     370,434,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       1,446,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 370,434,000      
Residential Whole-Loan And Residential Bridge Loan | Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $500,000- $749,999        
Mortgage Loans on Real Estate        
Number of Loans 345      
Principal balance       198,888,000
Fair Value $ 206,818,000     206,818,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       646,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 206,818,000      
Residential Whole-Loan And Residential Bridge Loan | Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $750,000 - $999,999        
Mortgage Loans on Real Estate        
Number of Loans 147      
Principal balance       121,140,000
Fair Value $ 125,727,000     125,727,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       790,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 125,727,000      
Residential Whole-Loan And Residential Bridge Loan | Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,000,000 - $1,249,999        
Mortgage Loans on Real Estate        
Number of Loans 34      
Principal balance       36,536,000
Fair Value $ 37,649,000     37,649,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       1,006,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 37,649,000      
Residential Whole-Loan And Residential Bridge Loan | Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,250,000 - $1,499,999        
Mortgage Loans on Real Estate        
Number of Loans 14      
Principal balance       18,452,000
Fair Value $ 19,228,000     19,228,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 19,228,000      
Residential Whole-Loan And Residential Bridge Loan | Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,500,000 and above        
Mortgage Loans on Real Estate        
Number of Loans 27      
Principal balance       65,071,000
Fair Value $ 67,418,000     67,418,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 67,418,000      
Residential Whole-Loan And Residential Bridge Loan | Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $0 - $249,999        
Mortgage Loans on Real Estate        
Number of Loans 4      
Principal balance       558,000
Fair Value $ 586,000     586,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 586,000      
Residential Whole-Loan And Residential Bridge Loan | Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $250,000 - $499,999        
Mortgage Loans on Real Estate        
Number of Loans 6      
Principal balance       2,026,000
Fair Value $ 2,128,000     2,128,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 2,128,000      
Residential Whole-Loan And Residential Bridge Loan | Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $500,000- $749,999        
Mortgage Loans on Real Estate        
Number of Loans 1      
Principal balance       450,000
Fair Value $ 473,000     473,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 473,000      
Residential Whole-Loan And Residential Bridge Loan | Variable Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,250,000 - $1,499,999        
Mortgage Loans on Real Estate        
Number of Loans 2      
Principal balance       1,344,000
Fair Value $ 1,415,000     1,415,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 1,415,000      
Residential Whole-Loan And Residential Bridge Loan | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $0 - $249,999        
Mortgage Loans on Real Estate        
Number of Loans 422      
Principal balance       66,458,000
Fair Value $ 68,988,000     68,988,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       247,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 68,988,000      
Residential Whole-Loan And Residential Bridge Loan | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $250,000 - $499,999        
Mortgage Loans on Real Estate        
Number of Loans 552      
Principal balance       189,163,000
Fair Value $ 195,762,000     195,762,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       719,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 195,762,000      
Residential Whole-Loan And Residential Bridge Loan | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $500,000- $749,999        
Mortgage Loans on Real Estate        
Number of Loans 128      
Principal balance       73,638,000
Fair Value $ 76,076,000     76,076,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 76,076,000      
Residential Whole-Loan And Residential Bridge Loan | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $750,000 - $999,999        
Mortgage Loans on Real Estate        
Number of Loans 35      
Principal balance       30,096,000
Fair Value $ 31,212,000     31,212,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 31,212,000      
Residential Whole-Loan And Residential Bridge Loan | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,000,000 - $1,249,999        
Mortgage Loans on Real Estate        
Number of Loans 12      
Principal balance       13,095,000
Fair Value $ 13,586,000     13,586,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 13,586,000      
Residential Whole-Loan And Residential Bridge Loan | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,250,000 - $1,499,999        
Mortgage Loans on Real Estate        
Number of Loans 8      
Principal balance       9,980,000
Fair Value $ 10,371,000     10,371,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 10,371,000      
Residential Whole-Loan And Residential Bridge Loan | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,500,000 and above        
Mortgage Loans on Real Estate        
Number of Loans 11      
Principal balance       21,714,000
Fair Value $ 22,420,000     22,420,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       2,271,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period 22,420,000      
Residential Bridge Loans | Adjustable Rate Residential Mortgage Loan Held in Securitization Trusts        
Mortgage Loans on Real Estate        
Principal balance       1,362,639,000
Fair Value 1,412,279,000     1,412,279,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 1,412,279,000      
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts        
Mortgage Loans on Real Estate        
Principal Amount of Loans Subject to Delinquent Principal or Interest       19,233,000
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $0 - $249,999        
Mortgage Loans on Real Estate        
Number of Loans 34      
Principal balance       4,722,000
Fair Value $ 4,545,000     4,545,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       1,930,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 4,545,000      
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $0 - $249,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 0.00%      
Principal balance       0
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $0 - $249,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 18.00%      
Principal balance       249,999
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $250,000 - $499,999        
Mortgage Loans on Real Estate        
Number of Loans 13      
Principal balance       4,907,000
Fair Value $ 4,887,000     4,887,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       420,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 4,887,000      
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $250,000 - $499,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 6.30%      
Principal balance       250,000
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $250,000 - $499,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 18.00%      
Principal balance       499,999
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $500,000- $749,999        
Mortgage Loans on Real Estate        
Number of Loans 10      
Principal balance       6,251,000
Fair Value $ 6,133,000     6,133,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       2,071,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 6,133,000      
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $500,000- $749,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 6.30%      
Principal balance       500,000
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $500,000- $749,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 13.00%      
Principal balance       749,999
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $750,000 - $999,999        
Mortgage Loans on Real Estate        
Number of Loans 11      
Principal balance       9,662,000
Fair Value $ 9,418,000     9,418,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       3,595,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 9,418,000      
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $750,000 - $999,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 7.30%      
Principal balance       750,000
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $750,000 - $999,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 18.00%      
Principal balance       999,999
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,000,000 - $1,249,999        
Mortgage Loans on Real Estate        
Number of Loans 4      
Principal balance       4,526,000
Fair Value $ 4,464,000     4,464,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       1,125,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 4,464,000      
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,000,000 - $1,249,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 7.30%      
Principal balance       1,000,000
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,000,000 - $1,249,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 10.00%      
Principal balance       1,249,999
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,250,000 - $1,499,999        
Mortgage Loans on Real Estate        
Number of Loans 2      
Principal balance       2,690,000
Fair Value $ 2,624,000     2,624,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       1,295,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 2,624,000      
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,250,000 - $1,499,999 | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 9.00%      
Principal balance       1,250,000
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,250,000 - $1,499,999 | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 10.80%      
Principal balance       1,499,999
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,500,000 and above        
Mortgage Loans on Real Estate        
Number of Loans 2      
Principal balance       4,437,000
Fair Value $ 4,348,000     4,348,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       1,672,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 4,348,000      
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,500,000 and above | Minimum        
Mortgage Loans on Real Estate        
Coupon Rate 7.50%      
Principal balance       1,500,000
Residential Bridge Loans | Fixed Rate Residential Mortgage Loan Held in Securitization Trusts | Original Loan Balance $1,500,000 and above | Maximum        
Mortgage Loans on Real Estate        
Coupon Rate 10.00%      
Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust        
Mortgage Loans on Real Estate        
Principal balance       370,213,000
Fair Value $ 370,213,000     370,213,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       0
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 370,213,000      
Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 20,000,000        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       20,000,000
Fair Value $ 20,000,000     20,000,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 20,000,000      
Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 7,258,696        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       7,259,000
Fair Value $ 7,259,000     7,259,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 7,259,000      
Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 30,000,000        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       30,000,000
Fair Value $ 30,000,000     30,000,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 30,000,000      
Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 4,425,400        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       4,425,000
Fair Value $ 4,425,000     4,425,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period 4,425,000      
Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 50,000,000        
Mortgage Loans on Real Estate        
Principal balance       50,000,000
Fair Value 50,000,000     50,000,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 50,000,000      
Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 90,000,000        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       90,000,000
Fair Value $ 90,000,000     90,000,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 90,000,000      
Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Balance Amount 40,000,000        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       40,000,000
Fair Value $ 40,000,000     40,000,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 40,000,000      
Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 13,206,521        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       13,206,000
Fair Value $ 13,206,000     13,206,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 13,206,000      
Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 24,534,783        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       24,535,000
Fair Value $ 24,535,000     24,535,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period 24,535,000      
Securitized Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust        
Mortgage Loans on Real Estate        
Principal balance       943,379,000
Fair Value 909,040,000     909,040,000
Principal Amount of Loans Subject to Delinquent Principal or Interest       0
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 909,040,000      
Securitized Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Balance 45,185,500        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       45,188,000
Fair Value $ 45,188,000     45,188,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 45,188,000      
Securitized Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 13,600,000        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       13,600,000
Fair Value $ 13,600,000     13,600,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 13,600,000      
Securitized Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 32,000,000        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       32,000,000
Fair Value $ 32,000,000     32,000,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 32,000,000      
Securitized Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 900,000,000        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       674,331,000
Fair Value $ 676,436,000     676,436,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 676,436,000      
Securitized Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 234,500,000        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       234,500,000
Fair Value $ 198,104,000     198,104,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 198,104,000      
Securitized Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 25,000,000        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       24,048,000
Fair Value $ 24,057,000     24,057,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 24,057,000      
Securitized Commercial Loans | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 10,500,000        
Mortgage Loans on Real Estate        
Number of Loans | loan 1      
Principal balance       10,500,000
Fair Value $ 10,443,000     $ 10,443,000
Reconciliation of Carrying Value of Mortgage Loans on Real Estate:        
Balance at end of period $ 10,443,000      
London Interbank Offered Rate (LIBOR) | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Balance 45,185,500        
Mortgage Loans on Real Estate        
Coupon Rate 4.25%      
London Interbank Offered Rate (LIBOR) | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 115,500,000        
Mortgage Loans on Real Estate        
Coupon Rate 5.30%      
London Interbank Offered Rate (LIBOR) | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 5,744,800        
Mortgage Loans on Real Estate        
Coupon Rate 5.25%      
London Interbank Offered Rate (LIBOR) | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 20,000,000        
Mortgage Loans on Real Estate        
Coupon Rate 6.50%      
London Interbank Offered Rate (LIBOR) | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 30,000,000        
Mortgage Loans on Real Estate        
Coupon Rate 4.50%      
London Interbank Offered Rate (LIBOR) | Commercial Mezzanine Loan Held in Securitization Trust | Original Loan Amount 1,350,000,000        
Mortgage Loans on Real Estate        
Coupon Rate 9.50%