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Accumulated Other Comprehensive Income, Accumulated Other Comprehensive Income (Loss) Balances, Net of Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance $ 599,987 $ 601,128 $ 568,161 [1]
Other comprehensive income (loss) - before reclassifications 14,260 (38,363) 410
Amount reclassified from accumulated other comprehensive income (303) (978) (199)
Other comprehensive income (loss), net of tax 13,957 (39,341) 211
Balance 645,285 599,987 601,128
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance (27,194) 12,147 11,936 [1]
Other comprehensive income (loss), net of tax 13,957 (39,341) 211
Balance (13,237) (27,194) 12,147
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) 7,186
Other comprehensive income (loss) - before reclassifications 8,372 (32,245) (7,212)
Amount reclassified from accumulated other comprehensive income 0 0 0
Other comprehensive income (loss), net of tax 8,372 (32,245) (7,212)
Balance (23,899) (32,271) (26)
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 6,084
Other comprehensive income (loss) - before reclassifications 5,888 (6,118) 7,622
Amount reclassified from accumulated other comprehensive income 0 0 0
Other comprehensive income (loss), net of tax 5,888 (6,118) 7,622
Balance 13,476 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) (1,334)
Other comprehensive income (loss) - before reclassifications 0 0 0
Amount reclassified from accumulated other comprehensive income (303) (978) (199)
Other comprehensive income (loss), net of tax (303) (978) (199)
Balance $ (2,814) $ (2,511) $ (1,533)
[1] All periods presented have been adjusted for the 1 for 5 reverse stock split which occurred on May 28, 2021.