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Investments - Amortized Cost, Fair Value and Unrealized Gains and (Losses) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Net Investment Income [Line Items] |  |
Amortized Cost | $ 97,812 | $ 67,880
Gross Unrealized, Gains | 56 | 150
Gross Unrealized, Losses | (6,227) | (455)
Fair value | 91,641 | 67,575
U.S. Treasuries |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 35,637 | 5,452
Gross Unrealized, Gains | 5 | 1
Gross Unrealized, Losses | (320) | (36)
Fair value | 35,322 | 5,417
Obligations of states, municipalities and political subdivisions |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 11,549 | 8,913
Gross Unrealized, Gains | 2 | 21
Gross Unrealized, Losses | (1,326) | (84)
Fair value | 10,225 | 8,850
Corporate bonds. |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 31,032 | 31,491
Gross Unrealized, Gains | 32 | 89
Gross Unrealized, Losses | (2,837) | (155)
Fair value | 28,227 | 31,425
Residential and commercial mortgage-backed securities |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 12,790 | 14,387
Gross Unrealized, Gains | 11 | 34
Gross Unrealized, Losses | (1,268) | (139)
Fair value | 11,533 | 14,282
Other loan-backed and structured securities |  |
Net Investment Income [Line Items] |  |
Amortized Cost | 6,804 | 7,637
Gross Unrealized, Gains | 6 | 5
Gross Unrealized, Losses | (476) | (41)
Fair value | $ 6,334 | $ 7,601

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