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Investments - Net Investment Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net investment income |  |  |
Interest income | $ 13,631 | $ 9,119 | $ 8,554
Dividend income | 739 | 461 | 489
Investment management fees and expenses | (493) | (500) | (431)
Net investment income | $ 13,877 | $ 9,080 | $ 8,612

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