Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 12,278	$ 8,871	$ 15,449	$ 13,396
Other comprehensive (loss) income, before tax:
Accumulated postretirement (benefit) expense obligation adjustment	(8)	0	63	0
Net unrealized gains (losses) on investments arising during the period	311	(246)	536	(670)
Reclassification adjustment for sale of securities included in net income	(2)	0	(5)	0
Reclassification adjustment for write-down of securities included in net income	0	21	0	74
Other comprehensive income (loss), before income tax	301	(225)	594	(596)
Income tax (benefit) expense related to postretirement health benefits	(2)	0	13	0
Income tax expense (benefit) related to net unrealized gains (losses) on investments arising during the period	67	(53)	115	(144)
Income tax benefit related to reclassification adjustment for sale of securities included in net income	(1)	0	(1)	0
Income tax expense related to reclassification adjustment for write-down of securities included in net income	0	6	0	18
Net income tax expense (benefit) on other comprehensive income (loss)	64	(47)	127	(126)
Other comprehensive income (loss), net of tax	237	(178)	467	(470)
Comprehensive Income	$ 12,515	$ 8,693	$ 15,916	$ 12,926