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Debt - Summary of Interest and Fees Related to Debt (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |  |
Stated interest expense | $ 22,288 | $ 20,603 | $ 16,561 |
Amortization of deferred financing costs | 2,110 | 2,146 | 2,104 | $ 2,104
Total interest and financing expenses | $ 24,398 | $ 22,749 | $ 18,665 |
Weighted average stated interest rate, period end | 4.599% | 4.346% | 4.037% |
Effective interest rate | 4.994% | 4.775% | 4.482% |
Unused commitment fee rate, period end | 0.592% | 1.261% | 1.20% |
SBA Debentures |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest expense | $ 7,809 | $ 6,914 | $ 3,747 |
Amortization of deferred financing costs | 656 | 733 | 598 |
Total interest and financing expenses | $ 8,465 | $ 7,647 | $ 4,345 |
Weighted average stated interest rate, period end | 4.316% | 4.226% | 3.479% |
Effective interest rate | 4.658% | 4.625% | 3.915% |
Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest expense | $ 2,617 | $ 1,739 | $ 1,424 |
Amortization of deferred financing costs | 335 | 297 | 394 |
Total interest and financing expenses | $ 2,952 | $ 2,036 | $ 1,818 |
Effective interest rate | 7.42% |  |  |
Unused commitment fee rate, period end | 0.592% | 1.261% | 1.20% |
Secured Borrowings |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest expense | $ 1,551 | $ 1,637 | $ 1,078 |
Total interest and financing expenses | $ 1,551 | $ 1,637 | $ 1,078 |
Weighted average stated interest rate, period end | 8.568% | 9.407% | 7.786% |
Effective interest rate | 8.568% | 9.407% | 7.786% |
Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest expense | $ 10,311 | $ 10,313 | $ 10,312 |
Amortization of deferred financing costs | 1,119 | 1,116 | 1,112 |
Total interest and financing expenses | $ 11,430 | $ 11,429 | $ 11,424 |
Weighted average stated interest rate, period end | 4.125% | 4.125% | 4.125% |
Effective interest rate | 4.576% | 4.576% | 4.576% |

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