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Investments - Summary of Investments in CLO Fund Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | $ 543,601 | $ 540,282
Fair Value |  | 471,255 | 467,865
CLO Fund Securities |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | 8,762 | 9,103
Fair Value |  | 8,549 | $ 8,968
CLO Fund Securities | Subordinated Notes |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | 8,762 |
Fair Value |  | $ 8,549 |
CLO Fund Securities | Subordinated Notes | Catamaran CLO 2014-1 Ltd. |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage Ownership | [1] | 22.20% | 22.20%
Cost/Amortized Cost |  | $ 702 | $ 1,024
Fair Value |  | $ 702 | $ 904
CLO Fund Securities | Subordinated Notes | Catamaran CLO 2018-1 Ltd. |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage Ownership | [1] | 24.80% | 24.80%
Cost/Amortized Cost |  | $ 3,846 | $ 3,923
Fair Value |  | $ 3,757 | $ 3,923
CLO Fund Securities | Subordinated Notes | Dryden 30 Senior Loan Fund |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage Ownership | [1] | 6.80% | 6.80%
Cost/Amortized Cost |  | $ 246 | $ 424
Fair Value |  | $ 246 | $ 409
CLO Fund Securities | Subordinated Notes | JMP Credit Advisors CLO IV Ltd. |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage Ownership | [1] | 57.20% | 57.20%
Cost/Amortized Cost |  | $ 715 | $ 683
Fair Value |  | $ 668 | $ 683
CLO Fund Securities | Subordinated Notes | JMP Credit Advisors CLO V Ltd. |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Percentage Ownership | [1] | 57.20% | 57.20%
Cost/Amortized Cost |  | $ 3,253 | $ 3,049
Fair Value |  | 3,176 | 3,049
Equity Securities |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Cost/Amortized Cost |  | 34,077 | 31,280
Fair Value |  | $ 23,428 | $ 20,533
[1] | Represents percentage of class held at March 31, 2024 and December 31, 2023, respectively.

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