Accumulated Other Comprehensive Gain (Loss) - Schedule of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 154,982	$ 143,544
Other comprehensive gain before reclassifications	548	1,567
Amounts reclassified from accumulated other comprehensive (loss) gain	16	27
Total other comprehensive gain income	564	1,594
Ending balance	156,588	147,036
Net Unrealized Gain (Loss) on Available for Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2,455	(1,360)
Other comprehensive gain before reclassifications	548	1,567
Amounts reclassified from accumulated other comprehensive (loss) gain	(17)	(10)
Total other comprehensive gain income	531	1,557
Ending balance	2,986	197
Defined Benefit Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(5,232)	(5,276)
Other comprehensive gain before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive (loss) gain	33	37
Total other comprehensive gain income	33	37
Ending balance	(5,199)	(5,239)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,777)	(6,636)
Total other comprehensive gain income	564	1,594
Ending balance	$ (2,213)	$ (5,042)