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Loans Held-for-Investment, Net of Allowance for Credit Losses - Loans Held-for-Investment (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
loan
Jun. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid principal balance $ 2,917,729 $ 3,362,006        
Unamortized (discount) premium (24) (48)        
Unamortized net deferred origination fees (8,850) (11,808)        
Allowance for credit losses (145,297) (82,335) $ (130,412) $ (82,611) $ (47,280) $ (40,897)
Loans held-for-investment, net 2,763,558 3,267,815 $ 2,966,088 $ 3,520,405 $ 3,830,014 $ 3,741,308
Unfunded commitments $ 142,056 $ 229,607        
Number of loans | loan 77 90        
Weighted average coupon (as a percent) 8.20% 6.30%        
Weighted average years to maturity (in years) 8 months 12 days 1 year        
Senior Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid principal balance $ 2,904,156 $ 3,348,242        
Unamortized (discount) premium (24) (48)        
Unamortized net deferred origination fees (8,850) (11,808)        
Allowance for credit losses (144,867) (81,768)        
Loans held-for-investment, net 2,750,415 3,254,618        
Unfunded commitments $ 142,056 $ 229,607        
Number of loans | loan 76 89        
Weighted average coupon (as a percent) 8.20% 6.30%        
Weighted average years to maturity (in years) 8 months 12 days 1 year        
B-Notes            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Unpaid principal balance $ 13,573 $ 13,764        
Unamortized (discount) premium 0 0        
Unamortized net deferred origination fees 0 0        
Allowance for credit losses (430) (567)        
Loans held-for-investment, net 13,143 13,197        
Unfunded commitments $ 0 $ 0        
Number of loans | loan 1 1        
Weighted average coupon (as a percent) 8.00% 8.00%        
Weighted average years to maturity (in years) 3 years 3 months 18 days 4 years 1 month 6 days