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Accumulated Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) $ (249,352) $ (24,970)
Unrealized Loss on Securities Available for Sale    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) (323,485) (32,067)
Deferred tax asset 74,337 7,369
Total accumulated other comprehensive income (loss) (249,148) (24,698)
Postretirement Plans Asset (Liability)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive income (loss) (265) (353)
Deferred tax asset 61 81
Total accumulated other comprehensive income (loss) $ (204) $ (272)