Accumulated Comprehensive Income (Loss), By Component (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]
Balance		$ 183,095	$ 148,021	$ 154,774	$ 139,229
Other comprehensive income (loss) before reclassifications (net of tax)		58	7	3,352	3,495
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)		(100)	41	142	137
Other comprehensive income (loss), net of tax		(42)	48	3,494	3,632
Balance		189,051	151,678	189,051	151,678
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance		2,907	(337)	(629)	(3,921)
Other comprehensive income (loss), net of tax		(42)	48	3,494	3,632
Balance		2,865	(289)	2,865	(289)
Unrealized Gain (Loss) on Available for Sale Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	[1]	5,938	2,515	2,290	(973)
Other comprehensive income (loss) before reclassifications (net of tax)	[1]	(35)	7	3,705	3,495
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)	[1]	(147)	(6)	(239)	(6)
Other comprehensive income (loss), net of tax	[1]	(182)	1	3,466	3,489
Balance	[1]	5,756	2,516	5,756	2,516
Defined Benefit Pension Items [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	[1]	(2,585)	(2,852)	(2,919)	(2,948)
Other comprehensive income (loss) before reclassifications (net of tax)	[1]	0	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)	[1]	47	47	381	143
Other comprehensive income (loss), net of tax	[1]	47	47	381	143
Balance	[1]	(2,538)	(2,805)	(2,538)	(2,805)
Unrealized Loss on Interest Rate Swap [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	[1]	(446)	0	0	0
Other comprehensive income (loss) before reclassifications (net of tax)	[1]	93	0	(353)	0
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)	[1]	0	0	0	0
Other comprehensive income (loss), net of tax	[1]	93	0	(353)	0
Balance	[1]	$ (353)	$ 0	$ (353)	$ 0

[1] Amounts in parentheses indicate debits on the Consolidated Balance Sheet.