Accumulated Other Comprehensive Loss, Accumulated Other Comprehensive (Loss) Income Balances, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance	$ 655,168	$ 649,190	$ 645,285	$ 621,389	$ 614,703	$ 599,987	$ 645,285	$ 599,987
Other comprehensive (loss) income - before reclassifications	7,816			(5,212)			7,080	(4,066)
Amount reclassified from accumulated other comprehensive income (loss)	(148)			(82)			(443)	(246)
Other comprehensive income (loss), net of tax	7,668	495	(1,526)	(5,294)	(2,837)	3,819	6,637	(4,312)
Balance	669,021	655,168	649,190	623,926	621,389	614,703	669,021	623,926
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax [Roll Forward]
Balance	(14,268)	(14,763)	(13,237)	(26,212)	(23,375)	(27,194)	(13,237)	(27,194)
Other comprehensive income (loss), net of tax	7,668	495	(1,526)	(5,294)	(2,837)	3,819
Balance	(6,600)	(14,268)	(14,763)	(31,506)	(26,212)	(23,375)	(6,600)	(31,506)
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	(24,635)		(23,899)	(31,125)		(32,271)	(23,899)	(32,271)
Other comprehensive (loss) income - before reclassifications	7,816			(5,212)			7,080	(4,066)
Amount reclassified from accumulated other comprehensive income (loss)	0			0			0	0
Other comprehensive income (loss), net of tax	7,816			(5,212)			7,080	(4,066)
Balance	(16,819)	(24,635)		(36,337)	(31,125)		(16,819)	(36,337)
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	(3,109)		$ (2,814)	(2,675)		$ (2,511)	(2,814)	(2,511)
Other comprehensive (loss) income - before reclassifications	0			0			0	0
Amount reclassified from accumulated other comprehensive income (loss)	(148)			(82)			(443)	(246)
Other comprehensive income (loss), net of tax	(148)			(82)			(443)	(246)
Balance	$ (3,257)	$ (3,109)		$ (2,757)	$ (2,675)		$ (3,257)	$ (2,757)