Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 389,108	$ 388,187
Current Period Change	(8,836)	4,862
Balance	376,209	386,442
Unrealized Holding Gains On Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	6,945
Current Period Change	(6,201)
Balance	744
Unrealized Actuarial Loss On Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(3,254)
Balance	(3,254)
Unrealized Losses On Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(3,096)
Current Period Change	(2,635)
Balance	(5,731)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	595	(9,440)
Current Period Change	(8,836)	4,862
Balance	$ (8,241)	$ (4,578)