Summary of Significant Accounting Policies (Schedule Of Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other comprehensive income (loss)
Change in net unrealized gain/(loss) during the period	$ (7,169)	$ 18,710	$ (12,905)
Reclassification adjustments for gains included in income	(14,436)	(450)	(1,889)
Reclassification adjustments for foreign currency translation losses	(551)
Reclassification adjustment for called securities			(133)
Amortization of (gains)/losses previously held as available for sale	56	(141)	30
Net unrealized gain/(loss) on investment securities	(22,100)	18,119	(14,897)
Deferred tax expense (benefit)
Change in net unrealized gain/(loss) during the period	(2,544)	6,549	(4,517)
Reclassification adjustments for gains included in income	(5,147)	(158)	(661)
Reclassification adjustment for called securities			(47)
Amortization of (gains)/losses previously held as available-for-sale	20	(49)	11
Income tax expense (benefit) related to items of other comprehensive income	(7,671)	6,342	(5,214)
Other comprehensive income (loss), net of tax and reclassifications into net income	(14,429)	11,777	(9,683)
Comprehensive income (loss)	$ (997)	$ 68,886	$ (24,105)