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Borrowed Funds - Senior term loan (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2022 | Oct. 31, 2022 | Mar. 31, 2024 | Dec. 31, 2023
Secured Borrowings |  |  |  |
Balance at end of period |  |  | $ 6,549 | $ 6,786
Senior Loans |  |  |  |
Secured Borrowings |  |  |  |
Balance at end of period |  |  | 6,549 | 6,786
Average balance during the period |  |  | 6,736 | 9,007
Maximum month-end balance |  |  | $ 6,794 | $ 9,768
Weighted-average rate during the period |  |  | 8.18% | 8.50%
Weighted-average rate at end of period |  |  | 7.63% | 8.76%
Senior Loans | Raymond James Senior Term Loan |  |  |  |
Secured Borrowings |  |  |  |
Face amount of debt issued | $ 10,000 | $ 10,000 |  |
Upfront fee (as a percent) |  | 1.00% |  |
Senior Loans | Raymond James Senior Term Loan | First year |  |  |  |
Secured Borrowings |  |  |  |
Periodic principal payment | 125 |  |  |
Senior Loans | Raymond James Senior Term Loan | Thereafter |  |  |  |
Secured Borrowings |  |  |  |
Periodic principal payment | $ 250 |  |  |
Senior Loans | Raymond James Senior Term Loan | SOFR |  |  |  |
Secured Borrowings |  |  |  |
Base rate |  | 2.75% |  |

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