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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 688
Other comprehensive income (loss):
Change in net actuarial gain	$ 35	$ 36	104	$ 108
Tax effect on change in net actuarial gain	(8)	(8)	(22)	(23)
Unrealized holding gains arising during the period	2,706	1,777	4,149	13,010
Tax effect on unrealized gains arising during the period	(568)	(373)	(872)	(2,732)
Reclassification adjustment for gains included in net income (loss)	(390)	(175)	(5,612)	(4,376)
Tax effect on reclassification adjustment for gains included in income (loss)	82	36	1,179	919
Other comprehensive income (loss), net of tax	1,857	1,293	(1,074)	6,906
Ending Balance	(386)		(386)
Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(3,239)	(3,334)
Other comprehensive income (loss):
Change in net actuarial gain			104	108
Tax effect on change in net actuarial gain			(22)	(23)
Other comprehensive income (loss), net of tax			82	85
Ending Balance	(3,157)	(3,249)	(3,157)	(3,249)
Unrealized Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			3,927	(3,326)
Other comprehensive income (loss):
Unrealized holding gains arising during the period			4,149	13,010
Tax effect on unrealized gains arising during the period			(872)	(2,732)
Reclassification adjustment for gains included in net income (loss)			(5,612)	(4,376)
Tax effect on reclassification adjustment for gains included in income (loss)			1,179	919
Other comprehensive income (loss), net of tax			(1,156)	6,821
Ending Balance	2,771	3,495	2,771	3,495
Accumulated Other Comprehensive (Loss) Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			688	(6,660)
Other comprehensive income (loss):
Change in net actuarial gain			104	108
Tax effect on change in net actuarial gain			(22)	(23)
Unrealized holding gains arising during the period			4,149	13,010
Tax effect on unrealized gains arising during the period			(872)	(2,732)
Reclassification adjustment for gains included in net income (loss)			(5,612)	(4,376)
Tax effect on reclassification adjustment for gains included in income (loss)			1,179	919
Other comprehensive income (loss), net of tax			(1,074)	6,906
Ending Balance	$ (386)	$ 246	$ (386)	$ 246