Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 31,458	$ 21,859	$ 25,701
Other comprehensive income (loss), before tax:
Amortization of unrecognized loss	0	0	9
Accumulated postretirement expense obligation adjustment	0	46	70
Unrealized gains (losses) on investments arising during the period	2,727	(1,900)	7,478
Reclassification adjustment for sale of securities included in net income	0	117	(1,227)
Reclassification adjustment for write-down of securities included in net income	0	0	26
Other comprehensive income (loss), before tax	2,727	(1,737)	6,356
Income tax expense related to postretirement health benefits	0	9	27
Income tax expense (benefit) related to unrealized gains (losses) on investments arising during the year	576	(401)	2,556
Income tax expense (benefit) related to reclassification adjustment for sale of securities included in net income	0	24	(419)
Income tax expense related to reclassification adjustment for write-down of securities included in net income	0	0	8
Net income tax expense (benefit) on other comprehensive income (loss)	576	(368)	2,172
Other comprehensive income (loss)	2,151	(1,369)	4,184
Comprehensive Income	33,609	20,490	29,885
Comprehensive loss attributable to noncontrolling interests	0	33	6
Comprehensive Income Attributable to the Company	$ 33,609	$ 20,523	$ 29,891