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Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Fair Valued Investments (Details) - Level 3 - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax
Net change in unrealized appreciation (depreciation) on investments $ (521) $ (2,861) $ (6,578) $ 1,099
Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     $ 1,090,506 $ 957,649
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Realized Gain (Loss), Investment and Derivative, Operating, before Tax Realized Gain (Loss), Investment and Derivative, Operating, before Tax
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]     Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax Unrealized Gain (Loss), Investment and Derivative, Operating, before Tax
Net realized gains (losses) on investments     $ 4,832 $ 12,161
Net change in unrealized appreciation (depreciation) on investments     8,009 (5,149)
Purchase of investments     284,480 274,194
Proceeds from sales and repayments of investments     (203,319) (154,109)
Interest and dividend income paid-in-kind     7,884 5,745
Proceeds from loan origination fees     (1,757) (1,952)
Accretion of loan origination fees     2,007 1,801
Accretion of original issue discount     106 335
Ending Balance 1,192,748 1,090,675 1,192,748 1,090,675
Subordinated Debt | Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     142,839 135,173
Net change in unrealized appreciation (depreciation) on investments     (470) 1,256
Purchase of investments       12,500
Proceeds from sales and repayments of investments     (37,246) (2,864)
Interest and dividend income paid-in-kind     2,378 3,101
Proceeds from loan origination fees       (157)
Accretion of loan origination fees     199 156
Accretion of original issue discount     5 5
Ending Balance 107,705 149,170 107,705 149,170
First Lien Debt | Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     718,120 578,140
Net realized gains (losses) on investments     (14,498) (3,280)
Net change in unrealized appreciation (depreciation) on investments     23,929 (1,467)
Purchase of investments     256,210 212,495
Proceeds from sales and repayments of investments     (137,539) (90,314)
Interest and dividend income paid-in-kind     3,348 822
Proceeds from loan origination fees     (1,667) (1,672)
Accretion of loan origination fees     1,726 1,503
Accretion of original issue discount     101 53
Transfers by type     9,645  
Ending Balance 859,375 696,280 859,375 696,280
Second Lien Debt | Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     83,543 119,561
Net realized gains (losses) on investments       (2,100)
Net change in unrealized appreciation (depreciation) on investments     (7,381) (2,481)
Purchase of investments     13,600 33,281
Proceeds from sales and repayments of investments       (36,472)
Interest and dividend income paid-in-kind     2,158 1,822
Proceeds from loan origination fees     (90) (123)
Accretion of loan origination fees     82 142
Accretion of original issue discount       277
Transfers by type     (9,645)  
Ending Balance 82,267 113,907 82,267 113,907
Equity | Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     138,371 120,007
Net realized gains (losses) on investments     11,214 17,541
Net change in unrealized appreciation (depreciation) on investments     (2,876) (5,524)
Purchase of investments     14,545 15,918
Proceeds from sales and repayments of investments     (18,160) (24,458)
Ending Balance 143,094 123,484 143,094 123,484
Warrant | Fair Value, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance     7,633 4,768
Net realized gains (losses) on investments     8,116  
Net change in unrealized appreciation (depreciation) on investments     (5,193) 3,067
Purchase of investments     125  
Proceeds from sales and repayments of investments     (10,374) (1)
Ending Balance $ 307 $ 7,834 $ 307 $ 7,834