Accumulated Other Comprehensive Loss (Schedule Of Amounts Reclassified Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassifications Out Of Accumulated Other Comprehensive Income [Line Items]
Net securities gains reclassified into earnings			$ 3,978	$ 2,130
Related income tax expense	$ (6,577)	$ (5,129)	(18,745)	(22,621)
Other comprehensive income (loss), net of tax	(783)	1,332	5,086	599
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	(2,668)	0	(3,513)	(2,130)
Related income tax expense	985	0	1,298	786
Other comprehensive income (loss), net of tax	$ (1,683)	$ 0	$ (2,215)	$ (1,344)