v3.25.1
Borrowings - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Nov. 08, 2024
Mar. 31, 2025
Dec. 31, 2024
Feb. 21, 2025
Feb. 20, 2025
Nov. 07, 2024
Debt Instrument [Line Items]            
Asset coverage (as percent)   180.30% 192.60%      
Average borrowings   $ 328,600,000 $ 258,400,000      
Weighted average interest rate (as percent)   6.86% 8.71%      
Line of credit facility, maximum borrowing capacity   $ 590,000,000 $ 401,641,000      
Aggregate amount of debt outstanding   364,844,000 254,387,000      
Revolving Credit Facility | A&R Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity   500,000,000 300,000,000      
Aggregate amount of debt outstanding   314,394,000 214,766,000      
Revolving Credit Facility | Subscription Facility | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity   90,000,000 90,000,000      
Aggregate amount of debt outstanding   50,450,000 27,980,000      
Secured Debt | Participation Agreements | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity     11,641,000      
Aggregate amount of debt outstanding     11,641,000      
Ally Bank | Revolving Credit Facility | Prior Onshore Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity           $ 100,000,000.0
Ally Bank | Revolving Credit Facility | Prior Offshore Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity           $ 100,000,000
Ally Bank | Revolving Credit Facility | A&R Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity $ 300,000,000.0     $ 500,000,000.0 $ 300,000,000.0  
Basis spread on variable rate (as percent) 2.25%          
Unused facility (as percent) 0.50%          
Aggregate amount of debt outstanding   314,400,000 214,800,000      
Ally Bank | Revolving Credit Facility | A&R Credit Facility, Non-Usage Fee Component 1 | Line of Credit            
Debt Instrument [Line Items]            
Unused capacity fee (as percent) 1.00%          
Ally Bank | Revolving Credit Facility | A&R Credit Facility, Non-Usage Fee Component 1 | Line of Credit | Maximum            
Debt Instrument [Line Items]            
Unused capacity, accrual period threshold percentage 25.00%          
Ally Bank | Revolving Credit Facility | A&R Credit Facility, Non-Usage Fee Component 2 | Line of Credit            
Debt Instrument [Line Items]            
Unused capacity fee (as percent) 0.75%          
Ally Bank | Revolving Credit Facility | A&R Credit Facility, Non-Usage Fee Component 2 | Line of Credit | Maximum            
Debt Instrument [Line Items]            
Unused capacity, accrual period threshold percentage 50.00%          
Ally Bank | Revolving Credit Facility | A&R Credit Facility, Non-Usage Fee Component 2 | Line of Credit | Minimum            
Debt Instrument [Line Items]            
Unused capacity, accrual period threshold percentage 25.00%          
Ally Bank | Revolving Credit Facility | A&R Credit Facility, Non-Usage Fee Component 3 | Line of Credit            
Debt Instrument [Line Items]            
Unused capacity fee (as percent) 0.50%          
Ally Bank | Revolving Credit Facility | A&R Credit Facility, Non-Usage Fee Component 3 | Line of Credit | Minimum            
Debt Instrument [Line Items]            
Unused capacity, accrual period threshold percentage 50.00%          
City National Bank | Revolving Credit Facility | Subscription Facility | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity $ 90,000,000.0          
Unused facility (as percent) 0.35%          
Aggregate amount of debt outstanding   50,500,000 $ 28,000,000.0      
City National Bank | Revolving Credit Facility | Subscription Facility | Line of Credit | Secured Overnight Financing Rate (SOFR)            
Debt Instrument [Line Items]            
Basis spread on variable rate (as percent) 2.50%          
City National Bank | Revolving Credit Facility | Subscription Facility | Line of Credit | Prime Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate (as percent) 1.50%          
Macquarie Bank Limited | Secured Debt | Participation Agreements | Line of Credit            
Debt Instrument [Line Items]            
Aggregate amount of debt outstanding   $ 0