Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 67,020	$ 39,420
Other comprehensive (loss) income, before tax:
Accumulated postretirement benefit obligation adjustment	0	(143)
Unrealized (losses) gains on investments arising during the period	(1,376)	1,253
Reclassification adjustment for sale of securities included in net income	(19)	(30)
Reclassification adjustment for write-down of securities included in net income	0	482
Other comprehensive (loss) income, before tax	(1,395)	1,562
Income tax benefit related to postretirement health benefits	0	(31)
Income tax (benefit) expense related to unrealized (losses) gains on investments arising during the year	(291)	262
Income tax benefit related to reclassification adjustment for sale of securities included in net income	(4)	(6)
Income tax expense related to reclassification adjustment for write-down of securities included in net income	0	111
Net income tax (benefit) expense on other comprehensive (loss) income	(295)	336
Other comprehensive (loss) income	(1,100)	1,226
Comprehensive Income	$ 65,920	$ 40,646