Changes in Accumulated Other Comprehensive Income by Component - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated other comprehensive income
Beginning balance	$ 440,572	$ 446,637	$ 426,172	$ 452,677
Other comprehensive income (loss) before reclassifications			344	(7,234)
Losses reclassified from other comprehensive income			3	20
Net current period other comprehensive income (loss)			347	(7,214)
Ending balance	450,589	437,845	450,589	437,845
Realized loss (less than)			100	100
Changes in other comprehensive (loss) income, tax expense (benefit)			100	(1,900)
Accumulated Other Comprehensive Loss, net of taxes
Accumulated other comprehensive income
Beginning balance	(2,270)	(1,269)	(3,477)	4,000
Ending balance	$ (3,130)	$ (3,214)	$ (3,130)	$ (3,214)