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Accumulated Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) $ (725) $ 14,350
Unrealized Gain (Loss) on Securities Available for Sale    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) 539 20,448
Deferred tax asset (liability) (124) (4,699)
Total accumulated other comprehensive income (loss) 415 15,749
Postretirement Plans Asset (Liability)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) (1,441) (1,817)
Deferred tax asset (liability) 301 418
Total accumulated other comprehensive income (loss) (1,140) (1,399)
Total    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) $ (725) $ 14,350