Accumulated Other Comprehensive Loss (Schedule Of Amounts Reclassified Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]
Related income tax expense	$ (6,303)	$ (6,125)	$ (12,169)	$ (17,492)
Other comprehensive income (loss), net of tax	3,126	(1,639)	5,869	(733)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings	(845)	(2,116)	(845)	(2,130)
Related income tax expense	312	781	312	786
Other comprehensive income (loss), net of tax	$ (533)	$ (1,335)	$ (533)	$ (1,344)