Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 376,209	$ 389,108	$ 386,442	$ 388,187	$ 389,108	$ 388,187
Current Period Change	6,168	(8,836)	3,320	4,862	(2,668)	8,182
Balance	389,738	376,209	391,437	386,442	389,738	391,437
Unrealized Holding Gains On Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		6,945			6,945
Current Period Change					(287)
Balance	6,658				6,658
Unrealized Actuarial Loss On Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(3,254)			(3,254)
Balance	(3,254)				(3,254)
Unrealized Losses On Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(3,096)			(3,096)
Current Period Change					(2,381)
Balance	(5,477)				(5,477)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(8,241)	595	(4,578)	(9,440)	595	(9,440)
Current Period Change	6,168	(8,836)	3,320	4,862	(2,668)
Balance	$ (2,073)	$ (8,241)	$ (1,258)	$ (4,578)	$ (2,073)	$ (1,258)