Changes in Accumulated Other Comprehensive Income Balances (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (6,660)
Other comprehensive income:
Change in net actuarial gain	$ 36	$ 27	108	$ 80
Tax effect on change in net actuarial gain	(8)	(6)	(23)	(17)
Unrealized holding gains (losses) arising during the period	1,777	342	13,010	1,909
Tax effect on unrealized gains arising during the period	(373)	(72)	(2,732)	(401)
Reclassification adjustment for realized (gain) losses included in investment gains and losses	(175)	166	(4,376)	159
Tax effect on reclassification adjustment for gains (losses) included in income tax expense	36	(35)	919	(33)
Other comprehensive income, net of tax	1,293	422	6,906	1,697
Reclassification of certain tax effects from accumulated other comprehensive income at January 1,2018					$ (2,600)
Ending Balance	246		246
Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(3,334)	(2,310)
Other comprehensive income:
Change in net actuarial gain			108	80
Tax effect on change in net actuarial gain			(23)	(17)
Other comprehensive income, net of tax			85	63
Reclassification of certain tax effects from accumulated other comprehensive income at January 1,2018						$ (569)
Ending Balance	(3,249)	(2,816)	(3,249)	(2,816)
Unrealized Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(3,326)	14,544
Other comprehensive income:
Unrealized holding gains (losses) arising during the period			13,010	1,909
Tax effect on unrealized gains arising during the period			(2,732)	(401)
Reclassification adjustment for realized (gain) losses included in investment gains and losses			(4,376)	159
Tax effect on reclassification adjustment for gains (losses) included in income tax expense			919	(33)
Other comprehensive income, net of tax			6,821	1,634
Reclassification of certain tax effects from accumulated other comprehensive income at January 1,2018						3,188
Ending Balance	3,495	2,373	3,495	2,373
Unrealized Gain (Loss) [Member] | Accounting Standards Update 2016-01 [Member]
Other comprehensive income:
Cumulative effect of adoption of updated accounting guidance for equity financial instruments at January 1,2018						(16,993)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(6,660)	12,234
Other comprehensive income:
Change in net actuarial gain			108	80
Tax effect on change in net actuarial gain			(23)	(17)
Unrealized holding gains (losses) arising during the period			13,010	1,909
Tax effect on unrealized gains arising during the period			(2,732)	(401)
Reclassification adjustment for realized (gain) losses included in investment gains and losses			(4,376)	159
Tax effect on reclassification adjustment for gains (losses) included in income tax expense			919	(33)
Other comprehensive income, net of tax			6,906	1,697
Reclassification of certain tax effects from accumulated other comprehensive income at January 1,2018						2,619
Ending Balance	$ 246	$ (443)	$ 246	$ (443)
Accumulated Other Comprehensive Income (Loss) [Member] | Accounting Standards Update 2016-01 [Member]
Other comprehensive income:
Cumulative effect of adoption of updated accounting guidance for equity financial instruments at January 1,2018						$ (16,993)