Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 7,585	$ 2,279	$ 8,766	$ 8,464
Other comprehensive (loss) income, before tax:
Accumulated postretirement benefit obligation adjustment	(7)	(8)	134	211
Net unrealized losses on investments arising during the period	(530)	(1,178)	(297)	(3,942)
Reclassification adjustment for sale of securities included in net income	0	46	0	46
Reclassification adjustment for write-down of securities included in net income	30	127	112	127
Other comprehensive loss, before income tax	(507)	(1,013)	(51)	(3,558)
Income tax (benefit) expense related to postretirement health benefits	(2)	(2)	28	44
Income tax benefit related to net unrealized losses on investments arising during the period	(113)	(252)	(66)	(835)
Income tax expense related to reclassification adjustment for sale of securities included in net income	0	10	0	10
Income tax expense related to reclassification adjustment for write-down of securities included in net income	7	29	26	29
Net income tax benefit on other comprehensive loss	(108)	(215)	(12)	(752)
Other Comprehensive Income (Loss), Net of Tax, Total	(399)	(798)	(39)	(2,806)
Comprehensive Income	$ 7,186	$ 1,481	$ 8,727	$ 5,658