Accumulated Other Comprehensive Loss, Accumulated Other Comprehensive Loss Balances, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance	$ 649,190	$ 645,285	$ 614,703	$ 599,987	$ 645,285	$ 599,987
Other comprehensive (loss) income - before reclassifications	642		(2,755)		(736)	1,146
Amount reclassified from accumulated other comprehensive income (loss)	(147)		(82)		(295)	(164)
Other comprehensive income (loss), net of tax	495	(1,526)	(2,837)	3,819	(1,031)	982
Balance	655,168	649,190	621,389	614,703	655,168	621,389
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance	(14,763)	(13,237)	(23,375)	(27,194)	(13,237)	(27,194)
Other comprehensive income (loss), net of tax	495	(1,526)	(2,837)	3,819
Balance	(14,268)	(14,763)	(26,212)	(23,375)	(14,268)	(26,212)
Net Unrealized Holding (Loss) Gain on Securities Available for Sale, Net of Tax [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance	(25,277)	(23,899)	(28,370)	(32,271)	(23,899)	(32,271)
Other comprehensive (loss) income - before reclassifications	642		(2,755)		(736)	1,146
Amount reclassified from accumulated other comprehensive income (loss)	0		0		0	0
Other comprehensive income (loss), net of tax	642		(2,755)		(736)	1,146
Balance	(24,635)	(25,277)	(31,125)	(28,370)	(24,635)	(31,125)
Net Change in Overfunded Position in Pension and Postretirement Plans Arising During the Year, Net of Tax [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance	13,476	13,476	7,588	7,588	13,476	7,588
Other comprehensive (loss) income - before reclassifications	0		0		0	0
Amount reclassified from accumulated other comprehensive income (loss)	0		0		0	0
Other comprehensive income (loss), net of tax	0		0		0	0
Balance	13,476	13,476	7,588	7,588	13,476	7,588
Net Change in Net Actuarial Gain and Prior Service Cost on Pension and Postretirement Benefit Plans, Net of Tax [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance	(2,962)	(2,814)	(2,593)	(2,511)	(2,814)	(2,511)
Other comprehensive (loss) income - before reclassifications	0		0		0	0
Amount reclassified from accumulated other comprehensive income (loss)	(147)		(82)		(295)	(164)
Other comprehensive income (loss), net of tax	(147)		(82)		(295)	(164)
Balance	$ (3,109)	$ (2,962)	$ (2,675)	$ (2,593)	$ (3,109)	$ (2,675)