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Accumulated Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) $ 2,218 $ 14,350
Unrealized Gain (Loss) on Securities Available for Sale    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) 4,212 20,448
Deferred tax asset (liability) (968) (4,699)
Total accumulated other comprehensive income (loss) 3,244 15,749
Postretirement Plans Asset (Liability)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) (1,332) (1,817)
Deferred tax asset (liability) 306 418
Total accumulated other comprehensive income (loss) (1,026) (1,399)
Total    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) $ 2,218 $ 14,350