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CONSOLIDATED SCHEDULE OF INVESTMENTS IN AND ADVANCES TO AFFILIATES - Summary of Schedule of Investment Gain/(Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income | $ 138,093 | $ 125,248 | $ 395,063 | $ 371,807
Investments, fair value, beginning balance |  |  | 3,659,978 |
Net Change in Unrealized Appreciation (Depreciation) | 32,989 | (13,894) | 55,214 | (44,982)
Investments, fair value, ending balance | 4,306,154 |  | 4,306,154 |
Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 10,526 | 10,009
Realized Gain (Loss) | 0 | 0 | 0 | 0
Investments, fair value, beginning balance |  |  | 113,179 | 115,004
Gross Additions |  |  | 13,794 | 1,155
Gross Reductions |  |  | (13,250) | 0
Net Change in Unrealized Appreciation (Depreciation) | (2,541) | 1,273 | (1,400) | (3,062)
Investments, fair value, ending balance | 112,323 | 113,097 | 112,323 | 113,097
Control investments | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 10,010 | 9,491
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 101,522 | 103,487
Gross Additions |  |  | 13,794 | 1,155
Gross Reductions |  |  | (13,250) | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | 1,981 | (3,588)
Investments, fair value, ending balance | 104,047 | 101,054 | 104,047 | 101,054
Control investments | Other Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 516 | 518
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 11,657 | 11,517
Gross Additions |  |  | 0 | 0
Gross Reductions |  |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | (3,381) | 526
Investments, fair value, ending balance | 8,276 | 12,043 | 8,276 | 12,043
Coronado Aesthetics, LLC | Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Realized Gain (Loss) | 0 | 0 | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | 31 | 133 | 275 | 57
Investments, fair value, ending balance | 344 | 319 | 344 | 319
Gibraltar Business Capital, LLC | Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Realized Gain (Loss) | 0 | 0 | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (118) | (74) | 386 | (6,365)
Investments, fair value, ending balance | 60,193 | 57,302 | 60,193 | 57,302
Hercules Adviser LLC | Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Realized Gain (Loss) | 0 | 0 | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (712) | 705 | 1,320 | 2,720
Investments, fair value, ending balance | 43,510 | 43,433 | 43,510 | 43,433
Tectura Corporation | Control investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Realized Gain (Loss) | 0 | 0 | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) | (1,742) | 509 | (3,381) | 526
Investments, fair value, ending balance | 8,276 | 12,043 | 8,276 | 12,043
Preferred Stock | Coronado Aesthetics, LLC | Control investments | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 0 | 0
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 69 | 260
Gross Additions |  |  | 0 | 0
Gross Reductions |  |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | 274 | 58
Investments, fair value, ending balance | 343 | 318 | 343 | 318
Preferred Stock | Tectura Corporation | Control investments | Other Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 0 | 0
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 3,623 | 3,263
Gross Additions |  |  | 0 | 0
Gross Reductions |  |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | (3,414) | 524
Investments, fair value, ending balance | 209 | 3,787 | 209 | 3,787
Common Stock | Coronado Aesthetics, LLC | Control investments | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 0 | 0
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 0 | 2
Gross Additions |  |  | 0 | 0
Gross Reductions |  |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | 1 | (1)
Investments, fair value, ending balance | 1 | 1 | 1 | 1
Common Stock | Tectura Corporation | Control investments | Other Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 0 | 0
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 7 | 4
Gross Additions |  |  | 0 | 0
Gross Reductions |  |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | (7) | 2
Investments, fair value, ending balance | 0 | 6 | 0 | 6
Unsecured Debt | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 3,910 | 4,034
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 36,212 | 34,478
Gross Additions |  |  | 1,794 | 1,155
Gross Reductions |  |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | 0 | 0
Investments, fair value, ending balance | 38,006 | 35,633 | 38,006 | 35,633
Unsecured Debt | Hercules Adviser LLC | Control investments | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 6,100 | 5,457
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 12,000 | 12,000
Gross Additions |  |  | 0 | 0
Gross Reductions |  |  | (12,000) | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | 0 | 0
Investments, fair value, ending balance | 0 | 12,000 | 0 | 12,000
Member Units | Gibraltar Business Capital, LLC | Control investments | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 0 | 0
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 23,051 | 28,034
Gross Additions |  |  | 0 | 0
Gross Reductions |  |  | (1,250) | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | 386 | (6,365)
Investments, fair value, ending balance | 22,187 | 21,669 | 22,187 | 21,669
Member Units | Hercules Adviser LLC | Control investments | Majority Owned Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 0 | 0
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 30,190 | 28,713
Gross Additions |  |  | 12,000 | 0
Gross Reductions |  |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | 1,320 | 2,720
Investments, fair value, ending balance | 43,510 | 31,433 | 43,510 | 31,433
Senior Secured Debt | Tectura Corporation | Control investments | Other Control Investments |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |
Amount of Interest and Fees Credited to Income |  |  | 516 | 518
Realized Gain (Loss) |  |  | 0 | 0
Investments, fair value, beginning balance |  |  | 8,027 | 8,250
Gross Additions |  |  | 0 | 0
Gross Reductions |  |  | 0 | 0
Net Change in Unrealized Appreciation (Depreciation) |  |  | 40 | 0
Investments, fair value, ending balance | $ 8,067 | $ 8,250 | $ 8,067 | $ 8,250

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