Accumulated Other Comprehensive Loss (Schedule of accumulated other comprehensive loss activity) (Details) - USD ($) $ in Thousands		3 Months Ended												9 Months Ended
		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Sep. 30, 2019		Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		$ 105,683		$ 102,849		$ 59,277		$ 55,561		$ 54,519		$ 54,977		$ 59,277		$ 54,977
Other Comprehensive Income (Loss), Net of Tax		422		1,561		1,096		(512)		463		(1,074)		3,079		(1,123)
Balance		108,255		105,683		102,849		57,013		55,561		54,519		$ 108,255		57,013
Income tax rate														21.00%
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(4,355)	[1]	(5,916)		(7,012)	[1]	(7,566)	[1]	(8,029)		(6,955)	[1]	$ (7,012)	[1]	(6,955)	[1]
Other comprehensive (loss) gain before reclassifications	[1]	351						(512)						2,835		(1,289)
Amounts reclassified from accumulated other comprehensive loss	[1]	71												244		166
Other Comprehensive Income (Loss), Net of Tax		422	[1]	1,561		1,096		(512)	[1]	463		(1,074)		3,079	[1]	(1,123)	[1]
Balance		(3,933)	[1]	(4,355)	[1]	(5,916)		(8,078)	[1]	(7,566)	[1]	(8,029)		(3,933)	[1]	(8,078)	[1]
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(246)				(339)		264				(534)		(339)		(534)
Other comprehensive (loss) gain before reclassifications	[1]	(24)												(72)		650
Amounts reclassified from accumulated other comprehensive loss	[1]	71												212		148
Other Comprehensive Income (Loss), Net of Tax	[1]	47												140		798
Balance	[1]	(199)		(246)				264		264				(199)		264
Unrealized gains (losses) on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	[1]	(4,109)				$ (6,673)		(7,830)				$ (6,421)		(6,673)		(6,421)
Other comprehensive (loss) gain before reclassifications	[1]	375						(512)						2,907		(1,939)
Amounts reclassified from accumulated other comprehensive loss	[1]	0												32		18
Other Comprehensive Income (Loss), Net of Tax	[1]	375						(512)						2,939		(1,921)
Balance	[1]	$ (3,734)		$ (4,109)				$ (8,342)		$ (7,830)				$ (3,734)		$ (8,342)

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