Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 391,437	$ 386,442	$ 388,187	$ 374,239	$ 361,446	$ 354,450	$ 388,187	$ 354,450
Current Period Change	463	3,320	4,862	(1,105)	(2,446)	(8,186)	8,645	(11,737)
Balance	388,129	391,437	386,442	380,270	374,239	361,446	388,129	380,270
Unrealized Holding Gains (Losses) On Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(2,955)				(2,955)
Current Period Change							11,538
Balance	8,583						8,583
Unrealized Actuarial Loss On Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(5,696)				(5,696)
Current Period Change							146
Balance	(5,550)						(5,550)
Unrealized Losses On Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(789)				(789)
Current Period Change							(3,039)
Balance	(3,828)						(3,828)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(1,258)	(4,578)	(9,440)	(10,363)	(7,917)	546	(9,440)	546
Current Period Change	463	3,320	4,862	(1,105)	(2,446)	(8,186)	8,645
Balance	$ (795)	$ (1,258)	$ (4,578)	$ (11,468)	$ (10,363)	$ (7,917)	$ (795)	$ (11,468)