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Accumulated Other Comprehensive Income (Schedule of Changes In Each Component of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance $ 578,027 $ 681,105
Other comprehensive loss 15,687 (58,974)
Amounts reclassified from other comprehensive income (588)  
Other comprehensive income (loss), net of tax 15,099 (58,974)
Ending balance 651,050 632,430
Defined Benefit Pension Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (3,422) (3,485)
Other comprehensive loss 0 0
Amounts reclassified from other comprehensive income 0  
Other comprehensive income (loss), net of tax 0 0
Ending balance (3,422) (3,485)
Securities available-for-sale:    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (128,066) 17,745
Other comprehensive loss 15,687 (58,974)
Amounts reclassified from other comprehensive income (588)  
Other comprehensive income (loss), net of tax 15,099 (58,974)
Ending balance (112,967) (41,229)
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (131,488) 14,260
Other comprehensive income (loss), net of tax 15,099 (58,974)
Ending balance $ (116,389) $ (44,714)