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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net unrealized securities gains (losses) reclassified into earnings			$ 0	$ 4,276
Related income tax expense	$ (5,358)	$ (6,812)	(9,763)	(14,459)
Net Income Available to Common Shareholders	20,979	14,688	38,590	30,714
Unrealized Gain (Losses) on Securities Available-for-Sale | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net unrealized securities gains (losses) reclassified into earnings	0	0	0	(4,276)
Related income tax expense	0	0	0	(1,578)
Net Income Available to Common Shareholders	$ 0	$ 0	$ 0	$ 2,698