Quarterly report pursuant to Section 13 or 15(d)

Commercial Real Estate Assets (Details)

v3.7.0.1
Commercial Real Estate Assets (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
unit
Dec. 31, 2016
USD ($)
unit
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial Real Estate Assets, Gross $ 1,560,021 $ 1,424,445    
Unamortized Discounts or Premiums, Commercial Real Estate Assets (195) (200)    
Unamortized Net Deferred Origination Fees, Commercial Real Estate Assets (11,223) (11,702)    
Commercial real estate assets 1,548,603 1,412,543 $ 744,259 $ 660,953
Unfunded Commitments, Commercial Real Estate Assets $ 181,875 $ 172,470    
Number of Instruments, Commercial Real Estate Assets | unit 40 36    
Weighted Average Coupon Rate, Commercial Real Estate Assets 5.60% 5.40%    
Weighted Average Years to Maturity, Commercial Real Estate Assets 2 years 8 months 12 days 2 years 9 months 18 days    
Second Mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial Real Estate Assets, Gross $ 135,364 $ 138,245    
Unamortized Discounts or Premiums, Commercial Real Estate Assets (14) (15)    
Unamortized Net Deferred Origination Fees, Commercial Real Estate Assets (111) (221)    
Commercial real estate assets 135,239 138,009    
Unfunded Commitments, Commercial Real Estate Assets $ 1,580 $ 1,580    
Number of Instruments, Commercial Real Estate Assets | unit 6 6    
Weighted Average Coupon Rate, Commercial Real Estate Assets 8.80% 8.60%    
Weighted Average Years to Maturity, Commercial Real Estate Assets 2 years 2 months 12 days 1 year 6 months    
First Mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial Real Estate Assets, Gross $ 1,409,678 $ 1,286,200    
Unamortized Discounts or Premiums, Commercial Real Estate Assets (181) (185)    
Unamortized Net Deferred Origination Fees, Commercial Real Estate Assets (11,112) (11,481)    
Commercial real estate assets 1,398,385 1,274,534    
Unfunded Commitments, Commercial Real Estate Assets $ 180,295 $ 170,890    
Number of Instruments, Commercial Real Estate Assets | unit 33 30    
Weighted Average Coupon Rate, Commercial Real Estate Assets 5.30% 5.10%    
Weighted Average Years to Maturity, Commercial Real Estate Assets 2 years 8 months 12 days 2 years 10 months 24 days    
Junior Loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial Real Estate Assets, Gross $ 14,979 $ 0    
Unamortized Discounts or Premiums, Commercial Real Estate Assets 0 0    
Unamortized Net Deferred Origination Fees, Commercial Real Estate Assets 0 0    
Commercial real estate assets 14,979 0    
Unfunded Commitments, Commercial Real Estate Assets $ 0 $ 0    
Number of Instruments, Commercial Real Estate Assets | unit 1 0    
Weighted Average Coupon Rate, Commercial Real Estate Assets 8.00% 0.00%    
Weighted Average Years to Maturity, Commercial Real Estate Assets 9 years 9 months 18 days 0 days