v3.26.1
Secured Borrowings - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2026
Feb. 28, 2026
May 31, 2026
Apr. 30, 2026
Mar. 31, 2026
Jan. 31, 2026
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Financing                        
Secured Borrowings                        
Face amount             $ 4,839,145     $ 4,839,145   $ 5,153,316
Morgan Stanley Bank, N.A.                        
Secured Borrowings                        
Amount at risk             1,100,000     $ 1,100,000    
Weighted average extended maturities                   3 years 10 months 24 days    
Wells Fargo Bank, N.A.                        
Secured Borrowings                        
Amount at risk             821,800     $ 821,800    
Weighted average extended maturities                   8 years 6 months    
JPMorgan Chase Bank N.A.                        
Secured Borrowings                        
Amount at risk             $ 696,600     $ 696,600    
Weighted average extended maturities                   4 years 2 months 12 days    
Repurchase Agreements                        
Secured Borrowings                        
Percentage of repurchase agreements for which margin calls are limited to collateral specific credit marks             68.00%     68.00%    
Percentage of repurchase agreements containing margin call provisions for general capital market activity             32.00%     32.00%    
Percentage of repurchase agreements containing margin call provisions that pertain to loans held-for-sale             7.00%     7.00%    
Secured Borrowings                        
Secured Borrowings                        
Amortization of deferred financing costs             $ 9,200   $ 8,900 $ 18,400 $ 17,700  
Long-term debt, gross             14,093,216     14,093,216   $ 12,780,793
Several Commercial Credit Facilities | Line of Credit                        
Secured Borrowings                        
Increase in borrowing capacity               $ 250,000        
Several Commercial Credit Facilities | Line of Credit | Minimum                        
Secured Borrowings                        
Weighted average maturity period (in years)               1 year 2 months 12 days        
Several Commercial Credit Facilities | Line of Credit | Maximum                        
Secured Borrowings                        
Weighted average maturity period (in years)               1 year 10 months 24 days        
Collateralized Loan Obligations, Starwood 2026-SIF7                        
Secured Borrowings                        
Face amount           $ 600,000            
Principal amount of notes purchased by third-party investors           496,200            
Long-term debt, gross           $ 103,800            
CLO contribution period           3 years            
STWD 2024-SIF3                        
Secured Borrowings                        
Repayments of debt           $ 330,000            
STWD 2024-SIF3 | Financing                        
Secured Borrowings                        
Pricing margin (as a percent)                       2.41%
Face amount                       $ 330,000
ABS, FI Series 2026-1                        
Secured Borrowings                        
Principal amount of notes purchased by third-party investors         $ 466,400     $ 466,400        
Weighted average interest rate         5.06%     5.06%        
ABS, FI Series 2026-1 | Financing                        
Secured Borrowings                        
Face amount             $ 466,100     $ 466,100    
Weighted average interest rate             5.06%     5.06%    
ABS, FI Series 2026-1 | Weighted-average                        
Secured Borrowings                        
Initial term         5 years 4 months 24 days              
ABS, FI Series 2023-1                        
Secured Borrowings                        
Repayments of debt         $ 323,600              
Weighted average interest rate         6.65%     6.65%        
ABS, FI Series 2023-1 | Financing                        
Secured Borrowings                        
Face amount                       $ 323,900
Weighted average interest rate                       6.65%
Securitized Financing                        
Secured Borrowings                        
Amortization of deferred financing costs             $ 1,900   $ 1,100 $ 3,600 $ 2,300  
Deferred financing costs, net of amortization             27,300     $ 27,300   $ 21,600
ABS Financing | Financing                        
Secured Borrowings                        
Pricing margin (as a percent)   5.73%     5.29%         5.29%   5.73%
Face amount             1,409,331     $ 1,409,331   $ 1,268,328
Secured Borrowings | 2032 Term Loan Facility | Line of Credit                        
Secured Borrowings                        
Maximum borrowing capacity $ 696,500   $ 971,500 $ 696,500                
Increase in borrowing capacity     $ 275,000                  
Outstanding amount             $ 969,100     $ 969,100    
Decrease in basis spread     0.25%                  
Pricing margin (as a percent) 2.25%   2.00%                  
Revolving Credit Facility | Revolving Warehouse Credit Facility Due 2031 | Line of Credit                        
Secured Borrowings                        
Maximum borrowing capacity $ 1,000,000     $ 1,000,000                
Pricing margin (as a percent)       1.55%                
Committed amount 500,000     $ 500,000                
Uncommitted amount $ 500,000     $ 500,000                
Initial term       5 years                
Advance rate 70.00%     70.00%