Accumulated Other Comprehensive Income (Schedule Of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014		Dec. 31, 2014	Dec. 31, 2013
Accumulated other comprehensive income		$ 48,789		$ 84,314		$ 48,789		$ 84,314		$ 62,093	$ 9,731
Other Comprehensive Income Before Reclassifications						(20,437)		114,971
Reclassified from Accumulated Oher Comprehensive Income						(1,021)		5,324
Other Comprehensive Income (Loss), before Tax						(21,458)		120,295
Other Comprehensive Income (Loss), Tax						8,154		(45,712)
Other comprehensive income (loss), net of tax		(42,928)		43,815		(13,304)		74,583
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		3,855	[1]	4,311	[1]	3,855	[1]	4,311	[1]	3,791	4,203
Other Comprehensive Income Before Reclassifications						(449)		(803)
Reclassified from Accumulated Oher Comprehensive Income						483		977
Other Comprehensive Income (Loss), before Tax	[1]					34		174
Other Comprehensive Income (Loss), Tax						(13)		(66)
Other comprehensive income (loss), net of tax	[1]					21		108
Transfer of Unrealized Gain on Securities For Which Impairment Was Not Previously Recognized						43		0
Unrealized Gain Loss on Securities Other [Member]
Accumulated other comprehensive income		67,130	[1]	95,332	[1]	67,130	[1]	95,332	[1]	81,310	21,303
Other Comprehensive Income Before Reclassifications						(19,988)		115,774
Reclassified from Accumulated Oher Comprehensive Income						(2,813)		3,627
Other Comprehensive Income (Loss), before Tax	[1]					(22,801)		119,401
Other Comprehensive Income (Loss), Tax						8,664		(45,372)
Other comprehensive income (loss), net of tax	[1]					(14,137)		74,029
Transfer of Unrealized Gain on Securities For Which Impairment Was Not Previously Recognized						(43)		0
Pension Loss [Member]
Accumulated other comprehensive income		$ (22,196)	[2]	$ (15,329)	[2]	(22,196)	[2]	(15,329)	[2]	$ (23,008)	$ (15,775)
Other Comprehensive Income Before Reclassifications						0		0
Reclassified from Accumulated Oher Comprehensive Income						1,309		720
Other Comprehensive Income (Loss), before Tax	[2]					1,309		720
Other Comprehensive Income (Loss), Tax						(497)		(274)
Other comprehensive income (loss), net of tax	[2]					812		446
Transfer of Unrealized Gain on Securities For Which Impairment Was Not Previously Recognized						$ 0		$ 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.