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Borrowings - SMBC Revolving Credit Facility (Details) - USD ($)
12 Months Ended
Mar. 06, 2023
Dec. 31, 2024
Dec. 31, 2023
Feb. 08, 2024
Dec. 14, 2023
Apr. 17, 2023
Debt Instrument [Line Items]            
Borrowings under credit facilities   $ 594,357,000 $ 535,467,000      
Line of Credit            
Debt Instrument [Line Items]            
Long-term debt, gross   $ 594,357,000 $ 535,467,000      
SMBC Credit Facility - March 6, 2023 | Line of Credit            
Debt Instrument [Line Items]            
Effective interest rate   6.535% 7.461%      
Long-term debt, gross   $ 137,875,000 $ 124,500,000      
SMBC Credit Facility - March 6, 2023 | Line of Credit | Level 3            
Debt Instrument [Line Items]            
Long-term debt, gross   137,900,000 124,500,000      
Revolving Credit Facility | SMBC Credit Facility - March 6, 2023            
Debt Instrument [Line Items]            
Unused facility amount greater than sixty seven percent 0.50%          
Unused exceeds of commitment fee percentage 0.375%          
Revolving Credit Facility | SMBC Credit Facility - March 6, 2023 | Line of Credit            
Debt Instrument [Line Items]            
Aggregate principal amount $ 115,000,000          
Line of credit facility, maximum borrowing capacity 500,000,000          
Revolving Credit Facility | April 2023 Credit Facilities | Line of Credit            
Debt Instrument [Line Items]            
Aggregate principal amount $ 115,000,000     $ 265,000,000 $ 215,000,000 $ 165,000,000
Revolving Credit Facility | April 2023 Credit Facilities | Line of Credit | Regions Bank            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity       $ 75,000,000   $ 50,000,000
Revolving Credit Facility | December 2023 Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Line of credit facility, maximum borrowing capacity         $ 25,000,000  
Revolving Credit Facility | SMBC Credit Facility - March 6, 2023 | Line of Credit            
Debt Instrument [Line Items]            
Borrowings under credit facilities   $ 137,900,000 $ 124,500,000      
Revolving Credit Facility | SMBC Credit Facility - March 6, 2023 | Line of Credit | Base Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 1.00%          
Revolving Credit Facility | SMBC Credit Facility - March 6, 2023 | Line of Credit | SOFR            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 2.00% 4.435% 5.361%      
Revolving Credit Facility | SMBC Foreign Currency Denominated Borrowings | Line of Credit | Base Rate            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 1.00%          
Revolving Credit Facility | SMBC Foreign Currency Denominated Borrowings | Line of Credit | Foreign Currency Base Rate Equivalent            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 2.00%          
Revolving Credit Facility | SMBC Pound Sterling Denominated Borrowings | Daily Simple Risk Free Rate (RFR)            
Debt Instrument [Line Items]            
Debt instrument, basis spread on variable rate 2.00%