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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 38,079	$ 33,765	$ 48,292
Unrealized (losses) gains on investments, net of tax of ($2,478), $1,814, and $3,014 in 2021, 2020, and 2019, respectively	(6,485)	4,745	7,887
Comprehensive income	$ 31,594	$ 38,510	$ 56,179

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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