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Summary of Significant Accounting Policies, Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investments: |  |
Equity securities | $ 19,124 | $ 18,716
Fixed maturities | 260,986 | 254,106
Recurring [Member] |  |
Investments: |  |
Equity securities | 19,124 | 18,716
Fixed maturities | 260,986 | 254,106
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Investments: |  |
Equity securities | 157 | 143
Fixed maturities | $ 250 | $ 0

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