Accumulated Other Comprehensive Loss (Schedule of accumulated other comprehensive loss activity) (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]
Balance		$ 113,897	$ 102,849	$ 109,882	$ 59,277
Balance		113,680	105,683	$ 113,680	$ 105,683
Income tax rate				21.00%	21.00%
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(1,219)	(5,916)	$ (4,104)	$ (7,012)
Other comprehensive (loss) gain before reclassifications	[1]	(1,658)	1,460	1,147	2,485
Amounts reclassified from accumulated other comprehensive loss	[1]	56	101	136	172
Period change	[1]	(1,602)	1,561	1,283	2,657
Balance	[1]	(2,821)	(4,355)	(2,821)	(4,355)
AOCL Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(3,631)	(4,381)	(3,909)	(4,436)
Other comprehensive (loss) gain before reclassifications	[1]	(1,088)	(32)	(867)	(48)
Amounts reclassified from accumulated other comprehensive loss	[1]	56	70	113	141
Period change	[1]	(1,032)	38	(754)	93
Balance	[1]	(4,663)	(4,343)	(4,663)	(4,343)
AOCL Unrealized gains (losses) on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	2,412	(1,535)	(195)	(2,576)
Other comprehensive (loss) gain before reclassifications	[1]	(570)	1,492	2,014	2,533
Amounts reclassified from accumulated other comprehensive loss	[1]		31	23	31
Period change	[1]	(570)	1,523	2,037	2,564
Balance	[1]	$ 1,842	$ (12)	$ 1,842	$ (12)

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