Accumulated Other Comprehensive Income (Loss), Accumulated Other Comprehensive Income (Loss) Balances, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	$ 687,808	$ 676,343	$ 649,190	$ 645,285	$ 676,343	$ 645,285
Other comprehensive income (loss) - before reclassifications	2,336		642		6,284	(736)
Amount reclassified from accumulated other comprehensive loss	(541)		(147)		(760)	(295)
Other comprehensive income (loss), net of tax	1,795	3,729	495	(1,526)	5,524	(1,031)
Balance	692,805	687,808	655,168	649,190	692,805	655,168
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(132)	(3,861)	(14,763)	(13,237)	(3,861)	(13,237)
Other comprehensive income (loss), net of tax	1,795	3,729	495	(1,526)
Balance	1,663	(132)	(14,268)	(14,763)	1,663	(14,268)
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	(17,765)	(21,713)	(25,277)	(23,899)	(21,713)	(23,899)
Other comprehensive income (loss) - before reclassifications	2,336		642		6,284	(736)
Amount reclassified from accumulated other comprehensive loss	0		0		0	0
Other comprehensive income (loss), net of tax	2,336		642		6,284	(736)
Balance	(15,429)	(17,765)	(24,635)	(25,277)	(15,429)	(24,635)
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	21,266	21,266	13,476	13,476	21,266	13,476
Other comprehensive income (loss) - before reclassifications	0		0		0	0
Amount reclassified from accumulated other comprehensive loss	0		0		0	0
Other comprehensive income (loss), net of tax	0		0		0	0
Balance	21,266	21,266	13,476	13,476	21,266	13,476
Net Change in Net Actuarial Gain and Prior Service Cost on Pension and Postretirement Benefit Plans, Net of Tax [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(3,633)	(3,414)	(2,962)	(2,814)	(3,414)	(2,814)
Other comprehensive income (loss) - before reclassifications	0		0		0	0
Amount reclassified from accumulated other comprehensive loss	(541)		(147)		(760)	(295)
Other comprehensive income (loss), net of tax	(541)		(147)		(760)	(295)
Balance	$ (4,174)	$ (3,633)	$ (3,109)	$ (2,962)	$ (4,174)	$ (3,109)