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Investments - Unrealized gains and losses (Details) - Municipal bonds - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Net Investment Income [Line Items] |  |
Unrealized Gains | $ 904 | $ 1,219
Unrealized Losses | $ 0 | $ 0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in the income statement on unsold other securities + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in the income statement on unsold other securities + References No definition available. + Details
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- Details
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