Accumulated Other Comprehensive Loss (Schedule of accumulated other comprehensive loss activity) (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]
Balance		$ 113,680	$ 105,683	$ 109,882	$ 59,277
Balance		115,190	108,255	$ 115,190	$ 108,255
Income tax rate				21.00%	21.00%
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(2,821)	(4,355)	$ (4,104)	$ (7,012)
Other comprehensive (loss) gain before reclassifications	[1]	206	351	1,353	2,835
Amounts reclassified from accumulated other comprehensive loss	[1]	56	71	192	244
Period change	[1]	262	422	1,545	3,079
Balance	[1]	(2,559)	(3,933)	(2,559)	(3,933)
AOCL Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(4,663)	(4,343)	(3,909)	(4,436)
Other comprehensive (loss) gain before reclassifications	[1]	637	(24)	(230)	(72)
Amounts reclassified from accumulated other comprehensive loss	[1]	56	71	169	212
Period change	[1]	693	47	(61)	140
Balance	[1]	(3,970)	(4,296)	(3,970)	(4,296)
AOCL Unrealized gains (losses) on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	1,842	(12)	(195)	(2,576)
Other comprehensive (loss) gain before reclassifications	[1]	(431)	375	1,583	2,907
Amounts reclassified from accumulated other comprehensive loss	[1]			23	32
Period change	[1]	(431)	375	1,606	2,939
Balance	[1]	$ 1,411	$ 363	$ 1,411	$ 363

[1] All amounts are net of tax. Related income tax expense or benefit is calculated using an income tax rate of 21.0%.