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Investments - Unrealized gains and losses (Details) - Municipal Bonds [Member] - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Net Investment Income [Line Items] |  |
Unrealized Gains | $ 1,204 | $ 866
Unrealized Losses | $ 0 | $ 0

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- Details
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