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Fair Value Measurements - Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Assets: |  |
Fair Value | $ 515,064 | $ 432,682
Equity securities, at fair value: (cost: $1,724 in 2021, $1,661 in 2020) | 38,576 | 33,261
U.S. Governments |  |
Assets: |  |
Fair Value | 48,551 | 16,870
States, territories, and possessions |  |
Assets: |  |
Fair Value | 5,354 | 4,014
Political subdivisions |  |
Assets: |  |
Fair Value | 4,298 | 6,380
Special revenue excluding mortgage/asset-backed securities |  |
Assets: |  |
Fair Value | 32,799 | 44,498
Industrial and miscellaneous |  |
Assets: |  |
Fair Value | 254,095 | 249,046
Mortgage/asset-backed securities |  |
Assets: |  |
Fair Value | 169,967 | 111,874
Fair Value, Measurements, Recurring |  |
Assets: |  |
Equity securities, at fair value: (cost: $1,724 in 2021, $1,661 in 2020) | 38,576 | 33,261
Cash, cash equivalents, and restricted cash | 68,164 | 50,371
Total assets | 621,804 | 516,314
Fair Value, Measurements, Recurring | U.S. Governments |  |
Assets: |  |
Fair Value | 48,551 | 16,870
Fair Value, Measurements, Recurring | States, territories, and possessions |  |
Assets: |  |
Fair Value | 5,354 | 4,014
Fair Value, Measurements, Recurring | Political subdivisions |  |
Assets: |  |
Fair Value | 4,298 | 6,380
Fair Value, Measurements, Recurring | Special revenue excluding mortgage/asset-backed securities |  |
Assets: |  |
Fair Value | 32,799 | 44,498
Fair Value, Measurements, Recurring | Industrial and miscellaneous |  |
Assets: |  |
Fair Value | 254,095 | 249,046
Fair Value, Measurements, Recurring | Mortgage/asset-backed securities |  |
Assets: |  |
Fair Value | 169,967 | 111,874
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Assets: |  |
Equity securities, at fair value: (cost: $1,724 in 2021, $1,661 in 2020) | 38,576 | 33,261
Cash, cash equivalents, and restricted cash | 68,164 | 50,371
Total assets | 106,740 | 83,632
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Assets: |  |
Total assets | 515,064 | 431,182
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | U.S. Governments |  |
Assets: |  |
Fair Value | 48,551 | 16,870
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | States, territories, and possessions |  |
Assets: |  |
Fair Value | 5,354 | 4,014
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Political subdivisions |  |
Assets: |  |
Fair Value | 4,298 | 6,380
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Special revenue excluding mortgage/asset-backed securities |  |
Assets: |  |
Fair Value | 32,799 | 44,498
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Industrial and miscellaneous |  |
Assets: |  |
Fair Value | 254,095 | 249,046
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Mortgage/asset-backed securities |  |
Assets: |  |
Fair Value | $ 169,967 | 110,374
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Assets: |  |
Total assets |  | 1,500
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Mortgage/asset-backed securities |  |
Assets: |  |
Fair Value |  | $ 1,500

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