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Accumulated Other Comprehensive Loss (Schedule of Changes in Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 1,062,343 $ 904,510 $ 1,230,575 $ 893,421
Other comprehensive loss before reclassifications (108,718) 2,829 (333,168) (12,505)
Amounts reclassified from accumulated other comprehensive income 34 114 102 373
Net current-period other comprehensive (loss) income (108,684) 2,943    
Ending balance 984,497 929,750 984,497 929,750
Unrealized Loss on Securities Available for Sale        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (249,148) 415 (24,698) 15,749
Other comprehensive loss before reclassifications (108,718) 2,829 (333,168) (12,505)
Amounts reclassified from accumulated other comprehensive income 0 0 0 0
Net current-period other comprehensive (loss) income (108,718) 2,829 (333,168) (12,505)
Ending balance (357,866) 3,244 (357,866) 3,244
Postretirement Plans Asset (Liability)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (204) (1,140) (272) (1,399)
Other comprehensive loss before reclassifications 0 0 0 0
Amounts reclassified from accumulated other comprehensive income 34 114 102 373
Net current-period other comprehensive (loss) income 34 114 102 373
Ending balance (170) (1,026) (170) (1,026)
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (249,352) (725) (24,970) 14,350
Net current-period other comprehensive (loss) income     (333,066) (12,132)
Ending balance $ (358,036) $ 2,218 $ (358,036) $ 2,218