Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	$ 62,093		$ 9,731		$ 136,344
Other Comprehensive Income (Loss), before Reclassifications, before Tax	76,121		(207,082)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	8,333		2,868
Other Comprehensive Income (Loss), before Tax	84,454		(204,214)
Other Comprehensive Income (Loss), Tax	(32,092)		77,601
Other comprehensive income	52,362		(126,613)		25,806
Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	(23,008)		(15,775)		(27,164)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(15,007)		15,285
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	3,341	[1]	3,085	[1]
Other Comprehensive Income (Loss), before Tax	(11,666)		18,370
Other Comprehensive Income (Loss), Tax	4,433		(6,981)
Other comprehensive income	(7,233)		11,389
Unrealized Gain Loss on Securities Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	81,310		21,303		160,263
Other Comprehensive Income (Loss), before Reclassifications, before Tax	93,158		(222,628)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	3,627	[2]	(1,501)	[2]
Other Comprehensive Income (Loss), before Tax	96,785		(224,129)
Other Comprehensive Income (Loss), Tax	(36,778)		85,169
Other comprehensive income	60,007		(138,960)
Unrealized Gain Loss on Securities OTTI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income	3,791		4,203		3,245
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(2,030)		261
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	1,365	[2]	1,284	[2]
Other Comprehensive Income (Loss), before Tax	(665)		1,545
Other Comprehensive Income (Loss), Tax	253		(587)
Other comprehensive income	$ (412)		$ 958

[1] 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" and "settlement loss recognized" (see Note 10), for inclusion in the consolidated statements of income.

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