Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Accumulated other comprehensive income		$ 65,636	$ 60,231	$ 65,636		$ 60,231	$ 62,093	$ 9,731
Other Comprehensive Income Before Reclassifications				6,279		75,397
Reclassified from Accumulated Oher Comprehensive Income				(564)		6,054
Other Comprehensive Income (Loss), before Tax				5,715		81,451
Other Comprehensive Income (Loss), Tax				(2,172)		(30,951)
Other comprehensive income (loss), net of tax		16,847	(24,083)	3,543		50,500
Transfer of Unrealized Gain on Securities For Which Impairment Was Not Previously Recognized				0		0
Unrealized Gain Loss on Securities OTTI [Member]
Accumulated other comprehensive income	[1]	3,528	4,067	3,528		4,067	3,791	4,203
Other Comprehensive Income Before Reclassifications	[1]			(976)		(1,568)
Reclassified from Accumulated Oher Comprehensive Income	[1]			483		1,348
Other Comprehensive Income (Loss), before Tax	[1]			(493)		(220)
Other Comprehensive Income (Loss), Tax	[1]			187		84
Other comprehensive income (loss), net of tax	[1]			(306)		(136)
Transfer of Unrealized Gain on Securities For Which Impairment Was Not Previously Recognized				43	[1]	0
Unrealized Gain Loss on Securities Other [Member]
Accumulated other comprehensive income	[1]	84,021	71,270	84,021		71,270	81,310	21,303
Other Comprehensive Income Before Reclassifications	[1]			7,255		76,965
Reclassified from Accumulated Oher Comprehensive Income	[1]			(2,813)		3,627
Other Comprehensive Income (Loss), before Tax	[1]			4,442		80,592
Other Comprehensive Income (Loss), Tax	[1]			(1,688)		(30,625)
Other comprehensive income (loss), net of tax	[1]			2,754		49,967
Transfer of Unrealized Gain on Securities For Which Impairment Was Not Previously Recognized				(43)	[1]	0
Pension Loss [Member]
Accumulated other comprehensive income	[2]	$ (21,913)	$ (15,106)	(21,913)		(15,106)	$ (23,008)	$ (15,775)
Other Comprehensive Income Before Reclassifications	[2]			0		0
Reclassified from Accumulated Oher Comprehensive Income	[2]			1,766		1,079
Other Comprehensive Income (Loss), before Tax	[2]			1,766		1,079
Other Comprehensive Income (Loss), Tax	[2]			(671)		(410)
Other comprehensive income (loss), net of tax	[2]			1,095		669
Transfer of Unrealized Gain on Securities For Which Impairment Was Not Previously Recognized				$ 0	[2]	$ 0

[1] The pre-tax amounts reclassified from accumulated other comprehensive income are included in "investment securities gains (losses), net" in the consolidated statements of income.

[2] The pre-tax amounts reclassified from accumulated other comprehensive income are included in the computation of net periodic pension cost as "amortization of unrecognized net loss" (see Note 6), for inclusion in the consolidated statements of income.