v3.26.1
Borrowings - Narrative (Details)
 3 Months Ended 6 Months Ended
Dec. 23, 2025
USD ($)
Dec. 22, 2025
Nov. 08, 2024
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Nov. 07, 2025
Nov. 06, 2025
Feb. 21, 2025
USD ($)
Nov. 07, 2024
USD ($)
Debt Instrument [Line Items]                        
Asset coverage ratio       181.77% 174.72% 181.77% 174.72% 173.00%        
Average borrowings       $ 505,400,000 $ 386,000,000.0 $ 511,500,000 $ 359,800,000          
Weighted average interest rate (as percent)       5.73% 6.66% 5.75% 6.71%          
Line of credit facility, maximum borrowing capacity       $ 626,746,000   $ 626,746,000   $ 645,996,000        
Aggregate amount of debt outstanding       531,265,000   531,265,000   531,190,000        
Revolving Credit Facility | A&R Credit Facility | Line of Credit                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity       575,000,000   575,000,000   575,000,000        
Aggregate amount of debt outstanding       480,200,000   480,200,000   495,100,000        
Revolving Credit Facility | Subscription Facility | Line of Credit                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity       51,746,000   51,746,000   70,996,000        
Aggregate amount of debt outstanding       51,065,000   51,065,000   36,090,000        
Ally Bank | Revolving Credit Facility | A&R Credit Facility | Line of Credit                        
Debt Instrument [Line Items]                        
Line of credit facility, maximum borrowing capacity $ 575,000,000.0   $ 300,000,000.0               $ 500,000,000.0  
Basis spread on variable rate (as percent) 2.00% 2.50%                    
Unused facility (as percent)     0.50%                  
Aggregate amount of debt outstanding       480,200,000   480,200,000   495,100,000        
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%                  
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                       $ 100,000,000.0
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       51,100,000   51,100,000   36,100,000        
Line of credit facility, borrowing base, percentage of unfunded capital commitments                 0.70 0.60    
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   $ 0   $ 0