Accumulated Other Comprehensive Gain (loss) - Schedule of Reclassifications out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassifications out of accumulated other comprehensive income
Net unrealized gain (loss) on available for sale securities	$ 186	$ (2)	$ 207	$ 11
Income tax effect	(851)	(759)	(1,512)	(1,571)
Net unrecognized pension costs	(5,230)	(5,523)	(10,897)	(11,024)
Net Income	3,760	4,245	6,833	8,189
Amount Reclassified from Accumulated Other Comprehensive Loss | Net unrealized gain (loss) on available for sale securities
Reclassifications out of accumulated other comprehensive income
Net unrealized gain (loss) on available for sale securities	186	(2)	207	11
Income tax effect	(39)	1	(43)	(2)
Net Income	147	(1)	164	9
Amount Reclassified from Accumulated Other Comprehensive Loss | Defined Benefit Plan
Reclassifications out of accumulated other comprehensive income
Income tax effect	11	10	19	20
Net unrecognized pension costs	(51)	(47)	(92)	(94)
Net Income	$ (40)	$ (37)	$ (73)	$ (74)