Accumulated Comprehensive Income, By Component (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance		$ 198,807	$ 159,923	$ 194,259	$ 154,774
Other comprehensive income (loss) before reclassifications (net of tax)		544	(130)	(1,074)	3,294
Amounts reclassified from accumulated other comprehensive (loss) income (net of tax)		64	119	97	242
Other comprehensive income (loss), net of tax		608	(11)	(977)	3,536
Balance		204,419	183,095	204,419	183,095
Accumulated Other Comprehensive Loss [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance		1,002	2,918	2,587	(629)
Other comprehensive income (loss), net of tax		608	(11)	(977)	3,536
Balance		1,610	2,907	1,610	2,907
Unrealized Gain (Loss) on Available for Sale Securities [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	[1]	2,784	5,714	6,058	2,290
Other comprehensive income (loss) before reclassifications (net of tax)	[1]	1,139	316	(2,096)	3,740
Amounts reclassified from accumulated other comprehensive (loss) income (net of tax)	[1]	0	(92)	(39)	(92)
Other comprehensive income (loss), net of tax	[1]	1,139	224	(2,135)	3,648
Balance	[1]	3,923	5,938	3,923	5,938
Defined Benefit Pension Items [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	[1]	(3,390)	(2,796)	(3,462)	(2,919)
Other comprehensive income (loss) before reclassifications (net of tax)	[1]	0	0	0	0
Amounts reclassified from accumulated other comprehensive (loss) income (net of tax)	[1]	64	211	136	334
Other comprehensive income (loss), net of tax	[1]	64	211	136	334
Balance	[1]	(3,326)	(2,585)	(3,326)	(2,585)
Unrealized Loss on Interest Rate Swap [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	[1]	1,608	0	(9)	0
Other comprehensive income (loss) before reclassifications (net of tax)	[1]	(595)	(446)	1,022	(446)
Amounts reclassified from accumulated other comprehensive (loss) income (net of tax)	[1]	0	0	0	0
Other comprehensive income (loss), net of tax	[1]	(595)	(446)	1,022	(446)
Balance	[1]	$ 1,013	$ (446)	$ 1,013	$ (446)

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