Quarterly report pursuant to Section 13 or 15(d)

Commercial Real Estate Assets (Details)

v3.8.0.1
Commercial Real Estate Assets (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
unit
Dec. 31, 2016
USD ($)
unit
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid principal balance $ 2,189,264 $ 1,424,445        
Unamortized (discount) premium (185) (200)        
Unamortized net deferred origination fees (17,735) (11,702)        
Commercial real estate assets 2,171,344 1,412,543 $ 1,782,749 $ 1,114,548 $ 926,377 $ 660,953
Unfunded commitments $ 272,234 $ 172,470        
Number of loans | unit 57 36        
Weighted average coupon 5.90% 5.40%        
Weighted average years to maturity 2 years 5 months 18 days 2 years 9 months 18 days        
First Mortgage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid principal balance $ 2,041,767 $ 1,286,200        
Unamortized (discount) premium (174) (185)        
Unamortized net deferred origination fees (17,695) (11,481)        
Commercial real estate assets 2,023,898 1,274,534        
Unfunded commitments $ 270,654 $ 170,890        
Number of loans | unit 50 30        
Weighted average coupon 5.60% 5.10%        
Weighted average years to maturity 2 years 5 months 14 days 2 years 10 months 24 days        
Second Mortgage [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid principal balance $ 132,605 $ 138,245        
Unamortized (discount) premium (11) (15)        
Unamortized net deferred origination fees (40) (221)        
Commercial real estate assets 132,554 138,009        
Unfunded commitments $ 1,580 $ 1,580        
Number of loans | unit 6 6        
Weighted average coupon 9.10% 8.60%        
Weighted average years to maturity 1 year 10 months 9 days 1 year 6 months        
Junior Loans [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid principal balance $ 14,892 $ 0        
Unamortized (discount) premium 0 0        
Unamortized net deferred origination fees 0 0        
Commercial real estate assets 14,892 0        
Unfunded commitments $ 0 $ 0        
Number of loans | unit 1 0        
Weighted average coupon 8.00% 0.00%        
Weighted average years to maturity 9 years 4 months 4 days 0 days