Changes in Accumulated Other Comprehensive Income Balances (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (6,660)
Other comprehensive income:
Change in net actuarial (gain) loss	120	$ (576)
Tax effect on change in net actuarial (gain) loss	(25)	121
Unrealized holding gains arising during the period	13,645	(3,343)
Tax effect on unrealized gains arising during the period	(2,865)	702
Reclassification adjustment for gains included in net realized gains	(4,464)	(1,803)
Tax effect on reclassification adjustment for gains included in income tax expense	937	379
Other comprehensive income (loss), net of tax	7,348	(4,520)
Ending Balance	688	(6,660)
Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,334)	(2,310)
Other comprehensive income:
Change in net actuarial (gain) loss	120	(576)
Tax effect on change in net actuarial (gain) loss	(25)	121
Other comprehensive income (loss), net of tax	95	(455)
Reclassification of certain tax effects from accumulated other comprehensive income at January 1,2018			$ (569)
Ending Balance	(3,239)	(3,334)
Unrealized Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,326)	14,544
Other comprehensive income:
Unrealized holding gains arising during the period	13,645	(3,343)
Tax effect on unrealized gains arising during the period	(2,865)	702
Reclassification adjustment for gains included in net realized gains	(4,464)	(1,803)
Tax effect on reclassification adjustment for gains included in income tax expense	937	379
Other comprehensive income (loss), net of tax	7,253	(4,065)
Reclassification of certain tax effects from accumulated other comprehensive income at January 1,2018			3,188
Cumulative effect of adoption of updated accounting guidance for equity financial instruments at January 1,2018			(16,993)
Ending Balance	3,927	(3,326)
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) loss	120	(576)
Tax effect on change in net actuarial (gain) loss	(25)	121
Unrealized holding gains arising during the period	13,645	(3,343)
Tax effect on unrealized gains arising during the period	(2,865)	702
Reclassification adjustment for gains included in net realized gains	(4,464)	(1,803)
Tax effect on reclassification adjustment for gains included in income tax expense	937	379
Other comprehensive income (loss), net of tax	7,348	(4,520)
Reclassification of certain tax effects from accumulated other comprehensive income at January 1,2018			2,619
Cumulative effect of adoption of updated accounting guidance for equity financial instruments at January 1,2018			$ (16,993)
Ending Balance	$ 688	$ (6,660)