Comprehensive Income (Loss), Net of Tax - Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 334,392	$ 301,728	$ 269,584
Other comprehensive income before reclassifications	1,016	5,187	6,776
Amounts reclassified from accumulated other comprehensive income	147	354	677
Other Comprehensive Income	1,163	5,541	7,453
Ending balance	371,186	334,392	301,728
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(816)	(6,357)	(13,810)
Other Comprehensive Income	1,163	5,541	7,453
Ending balance	347	(816)	(6,357)
Unrealized Gains and Losses on Available for Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	5,799	465	(3,697)
Other comprehensive income before reclassifications	(6,413)	5,306	4,162
Amounts reclassified from accumulated other comprehensive income	0	28	0
Other Comprehensive Income	(6,413)	5,334	4,162
Ending balance	(614)	5,799	465
Unrealized Gain on Cash Flow Swap
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	485	0	0
Other comprehensive income before reclassifications	929	485	0
Amounts reclassified from accumulated other comprehensive income	(94)	0	0
Other Comprehensive Income	835	485	0
Ending balance	1,320	485	0
Net Actuarial Gain (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(5,929)	(5,847)	(8,971)
Other comprehensive income before reclassifications	6,500	(251)	2,614
Amounts reclassified from accumulated other comprehensive income	68	169	510
Other Comprehensive Income	6,568	(82)	3,124
Ending balance	639	(5,929)	(5,847)
Net Prior Service (Cost) Credit
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,171)	(975)	(1,142)
Other comprehensive income before reclassifications	0	(353)	0
Amounts reclassified from accumulated other comprehensive income	173	157	167
Other Comprehensive Income	173	(196)	167
Ending balance	$ (998)	$ (1,171)	$ (975)

Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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