Accumulated Other Comprehensive Gain (loss) - Schedule of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 159,608	$ 151,521	$ 154,982	$ 143,544
Other comprehensive gain before reclassifications	1,046	996	2,949	4,784
Amounts reclassified from accumulated other comprehensive (loss) gain	(759)	(112)	(850)	(47)
Total other comprehensive income	287	884	2,099	4,737
Ending balance	162,429	155,061	162,429	155,061
Net Unrealized Gain on Available for Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	4,194	2,419	2,455	(1,360)
Other comprehensive gain before reclassifications	1,046	996	2,949	4,784
Amounts reclassified from accumulated other comprehensive (loss) gain	(800)	(149)	(964)	(158)
Total other comprehensive income	246	847	1,985	4,626
Ending balance	4,440	3,266	4,440	3,266
Defined Benefit  Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(5,159)	(5,202)	(5,232)	(5,276)
Other comprehensive gain before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) gain	41	37	114	111
Total other comprehensive income	41	37	114	111
Ending balance	(5,118)	(5,165)	(5,118)	(5,165)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(965)	(2,783)	(2,777)	(6,636)
Total other comprehensive income	287	884	2,099	4,737
Ending balance	$ (678)	$ (1,899)	$ (678)	$ (1,899)