Accumulated Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income (loss)	$ 21,253	$ 5,123
Unrealized Gain (Loss) on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income (loss)	30,508	9,743
Deferred tax asset (liability)	(7,011)	(2,239)
Total accumulated other comprehensive income (loss)	23,497	7,504
Postretirement Plans Asset (Liability)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income (loss)	(2,913)	(3,092)
Deferred tax asset (liability)	669	711
Total accumulated other comprehensive income (loss)	(2,244)	(2,381)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total accumulated other comprehensive income (loss)	$ 21,253	$ 5,123