Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 388,187	$ 354,450
Current Period Change	4,862	(8,186)
Balance	386,442	361,446
Unrealized Holding Gains (Losses) On Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2,955)
Current Period Change	5,881
Balance	2,926
Unrealized Actuarial Losses On Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(5,696)
Current Period Change	61
Balance	(5,635)
Unrealized Loss On Derivative Instrument [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(789)
Current Period Change	(1,080)
Balance	(1,869)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(9,440)	546
Current Period Change	4,862	(8,186)
Adoption of ASU 2018-02		(277)
Balance	$ (4,578)	$ (7,917)