Changes in Accumulated Other Comprehensive Income Balances (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 688
Other comprehensive (loss) income:
Change in net actuarial (gain) loss	(662)	$ 120
Tax effect on change in net actuarial gain (loss)	139	(25)
Unrealized holding gains arising during the period	709	13,645
Tax effect on unrealized gains arising during the period	(149)	(2,865)
Reclassification adjustment for gains included in net realized gains	(433)	(4,464)
Tax effect on reclassification adjustment for gains included in income tax expense	91	937
Other comprehensive income (loss), net of tax	(305)	7,348
Ending Balance	383	688
Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,239)	(3,334)
Other comprehensive (loss) income:
Change in net actuarial (gain) loss	(662)	120
Tax effect on change in net actuarial gain (loss)	139	(25)
Unrealized holding gains arising during the period	0	0
Tax effect on unrealized gains arising during the period	0	0
Reclassification adjustment for gains included in net realized gains	0	0
Tax effect on reclassification adjustment for gains included in income tax expense	0	0
Other comprehensive income (loss), net of tax	(523)	95
Ending Balance	(3,762)	(3,239)
Unrealized Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	3,927	(3,326)
Other comprehensive (loss) income:
Change in net actuarial (gain) loss	0	0
Tax effect on change in net actuarial gain (loss)	0	0
Unrealized holding gains arising during the period	709	13,645
Tax effect on unrealized gains arising during the period	(149)	(2,865)
Reclassification adjustment for gains included in net realized gains	(433)	(4,464)
Tax effect on reclassification adjustment for gains included in income tax expense	91	937
Other comprehensive income (loss), net of tax	218	7,253
Ending Balance	4,145	3,927
Accumulated Other Comprehensive Income (loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	688	(6,660)
Other comprehensive (loss) income:
Change in net actuarial (gain) loss	(662)	120
Tax effect on change in net actuarial gain (loss)	139	(25)
Unrealized holding gains arising during the period	709	13,645
Tax effect on unrealized gains arising during the period	(149)	(2,865)
Reclassification adjustment for gains included in net realized gains	(433)	(4,464)
Tax effect on reclassification adjustment for gains included in income tax expense	91	937
Other comprehensive income (loss), net of tax	(305)	7,348
Ending Balance	$ 383	$ 688