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Investments - Securities with Gross Unrealized Loss Position (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Net Investment Income [Line Items] |  |
Less than twelve months, gross unrealized loss | $ (4,015) | $ (3,693)
Less than twelve months, fair value | 86,979 | 53,357
Twelve months or greater, gross unrealized loss | (972) | (958)
Twelve months or greater, fair value | 9,738 | 9,955
Gross Unrealized Loss | (4,987) | (4,651)
Fair Value | 96,717 | 63,312
U.S. Treasuries |  |
Net Investment Income [Line Items] |  |
Less than twelve months, gross unrealized loss | (358) | (280)
Less than twelve months, fair value | 33,077 | 12,345
Twelve months or greater, gross unrealized loss | (56) | (50)
Twelve months or greater, fair value | 526 | 515
Gross Unrealized Loss | (414) | (330)
Fair Value | 33,603 | 12,860
Obligations of states, municipalities and political subdivisions |  |
Net Investment Income [Line Items] |  |
Less than twelve months, gross unrealized loss | (839) | (813)
Less than twelve months, fair value | 10,400 | 8,445
Twelve months or greater, gross unrealized loss | (149) | (148)
Twelve months or greater, fair value | 1,607 | 1,639
Gross Unrealized Loss | (988) | (961)
Fair Value | 12,007 | 10,084
Corporate bonds |  |
Net Investment Income [Line Items] |  |
Less than twelve months, gross unrealized loss | (1,859) | (1,698)
Less than twelve months, fair value | 27,414 | 21,104
Twelve months or greater, gross unrealized loss | (354) | (369)
Twelve months or greater, fair value | 4,590 | 4,677
Gross Unrealized Loss | (2,213) | (2,067)
Fair Value | 32,004 | 25,781
Residential and commercial mortgage-backed securities |  |
Net Investment Income [Line Items] |  |
Less than twelve months, gross unrealized loss | (692) | (621)
Less than twelve months, fair value | 13,523 | 8,673
Twelve months or greater, gross unrealized loss | (406) | (383)
Twelve months or greater, fair value | 2,964 | 3,072
Gross Unrealized Loss | (1,098) | (1,004)
Fair Value | 16,487 | 11,745
Other loan-backed and structured securities |  |
Net Investment Income [Line Items] |  |
Less than twelve months, gross unrealized loss | (267) | (281)
Less than twelve months, fair value | 2,565 | 2,790
Twelve months or greater, gross unrealized loss | (7) | (8)
Twelve months or greater, fair value | 51 | 52
Gross Unrealized Loss | (274) | (289)
Fair Value | $ 2,616 | $ 2,842

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