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Transactions With Related Parties - Our Manager (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Related Party Transaction [Line Items] |  |  |  |  |
Management fee payable | $ 16,849 |  | $ 16,849 |  | $ 18,534
Non-cash compensation expense | $ 7,302 | $ 7,984 | $ 21,570 | $ 24,058 |
Common stock, shares outstanding (in shares) | 170,720,119 |  | 170,720,119 |  | 172,792,094
Restricted Class A Common Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of shares of restricted class A common stock outstanding (in shares) | 1,582,654 |  | 1,582,654 |  | 2,142,759
Restricted shares, vesting period (in years) |  |  | 3 years |  |
Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common stock, shares outstanding (in shares) | 12,874,956 |  | 12,874,956 |  |
Percentage of stock | 7.50% |  | 7.50% |  |
Subsidiary of Common Parent |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Common stock, shares outstanding (in shares) | 8,234,581 |  | 8,234,581 |  |
Percentage of stock | 4.80% |  | 4.80% |  |
Director | Deferred Stock Units |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of shares of restricted class A common stock outstanding (in shares) | 331,611 |  | 331,611 |  |
BXMT Advisors Limited Liability Company and Affiliates | Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Management fee payable | $ 16,800 |  | $ 16,800 |  | $ 18,500
Manager | Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Renewal term (in years) |  |  | 1 year |  |
Management fees paid to manager | 17,000 | 18,700 | $ 52,800 | 64,000 |
Expenses | $ 449 | 340 | $ 868 | 1,400 |
Manager | Related Party | Restricted Class A Common Stock |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Number of shares of restricted class A common stock outstanding (in shares) | 828,213 |  | 828,213 |  |
Aggregate grant fair value |  |  | $ 17,100 |  |
Restricted shares, vesting period (in years) |  |  | 3 years |  |
Non-cash compensation expense | $ 3,600 | $ 4,200 | $ 10,900 | $ 12,600 |

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