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Investments - Net Investment Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net investment income
Interest income	$ 13,631	$ 9,119	$ 8,554
Dividend income	739	461	489
Investment management fees and expenses	(493)	(500)	(431)
Net investment income	$ 13,877	$ 9,080	$ 8,612

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Amount of dividend income on nonoperating securities.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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