Accumulated Comprehensive Income, By Component (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance		$ 204,419	$ 183,095	$ 194,259	$ 154,774
Other comprehensive income (loss) before reclassifications (net of tax)		(578)	58	(1,652)	3,352
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)		(63)	(100)	34	142
Other comprehensive income (loss), net of tax		(641)	(42)	(1,618)	3,494
Balance		208,967	189,051	208,967	189,051
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance		1,610	2,907	2,587	(629)
Other comprehensive income (loss), net of tax		(641)	(42)	(1,618)	3,494
Balance		969	2,865	969	2,865
Unrealized Gain (Loss) on Available for Sale Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	[1]	3,923	5,938	6,058	2,290
Other comprehensive income (loss) before reclassifications (net of tax)	[1]	(731)	(35)	(2,827)	3,705
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)	[1]	(128)	(147)	(167)	(239)
Other comprehensive income (loss), net of tax	[1]	(859)	(182)	(2,994)	3,466
Balance	[1]	3,064	5,756	3,064	5,756
Defined Benefit Pension Items [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	[1]	(3,326)	(2,585)	(3,462)	(2,919)
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]	65	47	201	381
Other comprehensive income (loss), net of tax	[1]	65	47	201	381
Balance	[1]	(3,261)	(2,538)	(3,261)	(2,538)
Unrealized Loss on Interest Rate Swap [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	[1]	1,013	(446)	(9)	0
Other comprehensive income (loss) before reclassifications (net of tax)	[1]	153	93	1,175	(353)
Amounts reclassified from accumulated other comprehensive income (loss) (net of tax)	[1]	0	0	0	0
Other comprehensive income (loss), net of tax	[1]	153	93	1,175	(353)
Balance	[1]	$ 1,166	$ (353)	$ 1,166	$ (353)

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