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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

Amount of unrealized gain (loss) recognized in the income statement on unsold other securities

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Amount of unrealized gain (loss) recognized in the income statement on unsold other securities

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