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Comprehensive Income/Loss (Comprised of the following Components) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ (114,827) $ (163,084)
Net change in other comprehensive income (loss) $ 37,023 $ (7,811) 37,625 2,338
Ending Balance (77,202) (160,746) (77,202) (160,746)
Unrealized Gain (Loss) on Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (96,231) (128,657)
Net change in other comprehensive income (loss)     28,670 (2,304)
Ending Balance (67,561) (130,961) (67,561) (130,961)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (20,575) (36,630)
Net change in other comprehensive income (loss)     9,000 4,917
Ending Balance (11,575) (31,713) (11,575) (31,713)
Defined Benefit Postretirement Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     1,979 2,203
Net change in other comprehensive income (loss)     (45) (275)
Ending Balance 1,934 1,928 1,934 1,928
AOCI Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net change in other comprehensive income (loss) $ 37,023 $ (7,811) $ 37,625 $ 2,338