v3.26.1
Borrowings - Narrative (Details)
 12 Months Ended
Dec. 23, 2025
USD ($)
Dec. 22, 2025
Nov. 08, 2024
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Nov. 07, 2025
Nov. 06, 2025
Feb. 21, 2025
USD ($)
Nov. 07, 2024
USD ($)
Debt Instrument [Line Items]                  
Asset coverage (as percent)       172.98% 192.57%        
Average borrowings       $ 418,900,000 $ 258,400,000        
Weighted average interest rate (as percent)       6.64% 8.71%        
Line of credit facility, maximum borrowing capacity       $ 645,996,000 $ 401,641,000        
Aggregate amount of debt outstanding       531,190,000 254,387,000        
Revolving Credit Facility | A&R Credit Facility | Line of Credit                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity       575,000,000 300,000,000        
Aggregate amount of debt outstanding       495,100,000 214,766,000        
Revolving Credit Facility | Subscription Facility | Line of Credit                  
Debt Instrument [Line Items]                  
Line of credit facility, maximum borrowing capacity       70,996,000 90,000,000        
Aggregate amount of debt outstanding       36,090,000 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 | 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       495,100,000 214,800,000        
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%            
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%            
Borrowing base, percentage of unfunded capital commitments           0.70 0.60    
Aggregate amount of debt outstanding       36,100,000 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]                  
Basis spread on variable rate (as percent)     3.68%            
Aggregate amount of debt outstanding       $ 0 $ 11,600,000        
Remaining contractual maturity (in days)         37 days