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Investments - Securities with Gross Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2022 USD ($) item security | Dec. 31, 2021 USD ($) item security
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Net Investment Income [Line Items] |  |
Less Than Twelve Months, Gross Unrealized Loss | $ (3,725) | $ (455)
Less Than Twelve Months, Fair Value | 44,735 | 41,250
Twelve Months or Greater, Gross Unrealized Loss | (2,502) |
Twelve Months or Greater, Fair Value | 29,702 |
Total, Gross Unrealized Loss | (6,227) | (455)
Total, Fair Value | $ 74,437 | $ 41,250
Number of securities in an unrealized loss position | security | 483 | 358
Unrealized loss position for 12 months or longer | item | 218 | 0
U.S. Treasuries |  |
Net Investment Income [Line Items] |  |
Less Than Twelve Months, Gross Unrealized Loss | $ (127) | $ (36)
Less Than Twelve Months, Fair Value | 10,748 | 5,007
Twelve Months or Greater, Gross Unrealized Loss | (193) |
Twelve Months or Greater, Fair Value | 9,824 |
Total, Gross Unrealized Loss | (320) | (36)
Total, Fair Value | 20,572 | 5,007
Obligations of states, municipalities and political subdivisions |  |
Net Investment Income [Line Items] |  |
Less Than Twelve Months, Gross Unrealized Loss | (929) | (84)
Less Than Twelve Months, Fair Value | 6,258 | 4,292
Twelve Months or Greater, Gross Unrealized Loss | (397) |
Twelve Months or Greater, Fair Value | 3,504 |
Total, Gross Unrealized Loss | (1,326) | (84)
Total, Fair Value | 9,762 | 4,292
Corporate Bonds |  |
Net Investment Income [Line Items] |  |
Less Than Twelve Months, Gross Unrealized Loss | (1,623) | (155)
Less Than Twelve Months, Fair Value | 16,531 | 15,446
Twelve Months or Greater, Gross Unrealized Loss | (1,214) |
Twelve Months or Greater, Fair Value | 10,328 |
Total, Gross Unrealized Loss | (2,837) | (155)
Total, Fair Value | 26,859 | 15,446
Residential and commercial mortgage-backed securities |  |
Net Investment Income [Line Items] |  |
Less Than Twelve Months, Gross Unrealized Loss | (687) | (139)
Less Than Twelve Months, Fair Value | 6,565 | 9,687
Twelve Months or Greater, Gross Unrealized Loss | (581) |
Twelve Months or Greater, Fair Value | 4,952 |
Total, Gross Unrealized Loss | (1,268) | (139)
Total, Fair Value | 11,517 | 9,687
Other loan-backed and structured securities |  |
Net Investment Income [Line Items] |  |
Less Than Twelve Months, Gross Unrealized Loss | (359) | (41)
Less Than Twelve Months, Fair Value | 4,633 | 6,818
Twelve Months or Greater, Gross Unrealized Loss | (117) |
Twelve Months or Greater, Fair Value | 1,094 |
Total, Gross Unrealized Loss | (476) | (41)
Total, Fair Value | $ 5,727 | $ 6,818

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