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Accumulated Other Comprehensive (Loss) Income (Schedule of Changes In Each Component of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance $ 636,192 $ 591,993 $ 578,027 $ 681,105
Other comprehensive loss (36,700) (61,499)    
Amounts reclassified from other comprehensive income 555   (33)  
Other comprehensive (loss) income, net of tax (36,145) (61,499) (35,105) (159,742)
Ending balance 610,134 548,288 610,134 548,288
Defined Benefit Pension Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (3,422) (3,485) (3,422) (3,485)
Other comprehensive loss 0 0 0 0
Amounts reclassified from other comprehensive income 0   0  
Other comprehensive (loss) income, net of tax 0 0 0 0
Ending balance (3,422) (3,485) (3,422) (3,485)
Securities available-for-sale:        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (127,026) (80,498) (128,066) 17,745
Other comprehensive loss (36,700) (61,499) (35,072) (159,742)
Amounts reclassified from other comprehensive income 555   (33)  
Other comprehensive (loss) income, net of tax (36,145) (61,499) (35,105) (159,742)
Ending balance (163,171) (141,997) (163,171) (141,997)
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning Balance (130,448) (83,983) (131,488) 14,260
Other comprehensive loss     (35,072) (159,742)
Other comprehensive (loss) income, net of tax (36,145) (61,499) (35,105) (159,742)
Ending balance $ (166,593) $ (145,482) $ (166,593) $ (145,482)