Investment Securities (Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	$ 26,128	$ 1,079,055
Less than 12 months, Unrealized Losses	(12)	(10,219)
12 months or longer, Fair Value	186,797	484,512
12 months or longer, Unrealized Losses	(1,286)	(12,991)
Total Fair Value	212,925	1,563,567
Total Unrealized Losses	(1,298)	(23,210)
Government Agency Issued Collateralized Mortgage Obligations ("CMO")
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	26,121	845,534
Less than 12 months, Unrealized Losses	(10)	(7,734)
12 months or longer, Fair Value	186,797	450,079
12 months or longer, Unrealized Losses	(1,286)	(11,967)
Total Fair Value	212,918	1,295,613
Total Unrealized Losses	(1,296)	(19,701)
Government Agency Issued Mortgage-Backed Securities ("MBS")
Schedule of Investments [Line Items]
Less than 12 months, Fair Value		233,521
Less than 12 months, Unrealized Losses		(2,485)
12 months or longer, Fair Value		33,582
12 months or longer, Unrealized Losses		(784)
Total Fair Value		267,103
Total Unrealized Losses		(3,269)
Total debt securities
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	26,121	1,079,055
Less than 12 months, Unrealized Losses	(10)	(10,219)
12 months or longer, Fair Value	186,797	483,661
12 months or longer, Unrealized Losses	(1,286)	(12,751)
Total Fair Value	212,918	1,562,716
Total Unrealized Losses	(1,296)	(22,970)
Equity
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	7	0
Less than 12 months, Unrealized Losses	(2)	0
12 months or longer, Fair Value	0	851
12 months or longer, Unrealized Losses	0	(240)
Total Fair Value	7	851
Total Unrealized Losses	$ (2)	$ (240)