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Investments - Amortized Cost, Fair Value and Unrealized Gains and (Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Net Investment Income [Line Items] |  |
Amortized Cost | $ 138,755 | $ 143,036
Gross unrealized, gains | 348 | 791
Gross unrealized, losses | (4,987) | (4,651)
Fair Value | 134,116 | 139,176
U.S. Treasuries |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 36,212 | 43,931
Gross unrealized, gains | 21 | 95
Gross unrealized, losses | (414) | (330)
Fair Value | 35,819 | 43,696
Obligations of states, municipalities and political subdivisions |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 19,481 | 18,281
Gross unrealized, gains | 52 | 100
Gross unrealized, losses | (988) | (961)
Fair Value | 18,545 | 17,420
Corporate bonds |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 54,417 | 51,678
Gross unrealized, gains | 209 | 430
Gross unrealized, losses | (2,213) | (2,067)
Fair Value | 52,413 | 50,041
Residential and commercial mortgage-backed securities |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 25,217 | 25,452
Gross unrealized, gains | 54 | 153
Gross unrealized, losses | (1,098) | (1,004)
Fair Value | 24,173 | 24,601
Other loan-backed and structured securities |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 3,428 | 3,694
Gross unrealized, gains | 12 | 13
Gross unrealized, losses | (274) | (289)
Fair Value | $ 3,166 | $ 3,418

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