Changes in Accumulated Other Comprehensive Income Balances (Schedule of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 688
Other comprehensive income (loss):
Change in net actuarial gain	$ 35	$ 37	69	$ 72
Tax effect on change in net actuarial gain	(7)	(8)	(14)	(15)
Unrealized holding gains arising during the period	8,430	3,460	1,443	11,233
Tax effect on unrealized gains arising during the period	(1,771)	(727)	(304)	(2,359)
Reclassification adjustment for gains included in net income (loss)	414	(60)	(5,222)	(4,201)
Tax effect on reclassification adjustment for gains included in income (loss)	(87)	13	1,097	883
Other comprehensive income (loss), net of tax	7,014	2,715	(2,931)	5,613
Ending Balance	(2,243)		(2,243)
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			69	72
Tax effect on change in net actuarial gain			(14)	(15)
Other comprehensive income (loss), net of tax			55	57
Ending Balance	(3,184)	(3,277)	(3,184)	(3,277)
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			1,443	11,233
Tax effect on unrealized gains arising during the period			(304)	(2,359)
Reclassification adjustment for gains included in net income (loss)			(5,222)	(4,201)
Tax effect on reclassification adjustment for gains included in income (loss)			1,097	883
Other comprehensive income (loss), net of tax			(2,986)	5,556
Ending Balance	941	2,230	941	2,230
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			688	(6,660)
Other comprehensive income (loss):
Change in net actuarial gain			69	72
Tax effect on change in net actuarial gain			(14)	(15)
Unrealized holding gains arising during the period			1,443	11,233
Tax effect on unrealized gains arising during the period			(304)	(2,359)
Reclassification adjustment for gains included in net income (loss)			(5,222)	(4,201)
Tax effect on reclassification adjustment for gains included in income (loss)			1,097	883
Other comprehensive income (loss), net of tax			(2,931)	5,613
Ending Balance	$ (2,243)	$ (1,047)	$ (2,243)	$ (1,047)