Accumulated Other Comprehensive Loss, Accumulated Other Comprehensive Income (Loss) Balances, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	$ 599,987	$ 601,128
Other comprehensive income (loss) - before reclassifications	3,901	(14,251)
Amount reclassified from accumulated other comprehensive loss	(82)	(265)
Other comprehensive income (loss), net of tax	3,819	(14,516)
Balance	614,703	592,895
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(27,194)	12,147
Other comprehensive income (loss), net of tax	3,819	(14,516)
Balance	(23,375)	(2,369)
Net Unrealized Holding Gain (Loss) on Securities Available for Sale, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(32,271)	(26)
Other comprehensive income (loss) - before reclassifications	3,901	(14,251)
Amount reclassified from accumulated other comprehensive loss	0	0
Other comprehensive income (loss), net of tax	3,901	(14,251)
Balance	(28,370)	(14,277)
Net Change in Overfunded Position in Pension and Postretirement Plans Arising During the Year, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	7,588	13,706
Other comprehensive income (loss) - before reclassifications	0	0
Amount reclassified from accumulated other comprehensive loss	0	0
Other comprehensive income (loss), net of tax	0	0
Balance	7,588	13,706
Net Change in Net Actuarial Gain and Prior Service Cost (Credit) on Pension and Postretirement Benefit Plans, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(2,511)	(1,533)
Other comprehensive income (loss) - before reclassifications	0	0
Amount reclassified from accumulated other comprehensive loss	(82)	(265)
Other comprehensive income (loss), net of tax	(82)	(265)
Balance	$ (2,593)	$ (1,798)