Investment Securities (Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	$ 758,304	$ 1,396,178
Less than 12 months, Unrealized Losses	(5,555)	(39,612)
12 months or longer, Fair Value	1,053,424	12,018
12 months or longer, Unrealized Losses	(37,057)	(77)
Total Fair Value	1,811,728	1,408,196
Total Unrealized Losses	(42,612)	(39,689)
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	724,834	1,241,836
Less than 12 months, Unrealized Losses	(5,113)	(36,025)
12 months or longer, Fair Value	949,556	12,018
12 months or longer, Unrealized Losses	(34,886)	(77)
Total Fair Value	1,674,390	1,253,854
Total Unrealized Losses	(39,999)	(36,102)
Mortgage Backed Securities Issued By U S Government Sponsored Enterprises [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	32,621	154,299
Less than 12 months, Unrealized Losses	(244)	(3,570)
12 months or longer, Fair Value	103,858	0
12 months or longer, Unrealized Losses	(2,137)	0
Total Fair Value	136,479	154,299
Total Unrealized Losses	(2,381)	(3,570)
Total debt securities
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	757,455	1,396,135
Less than 12 months, Unrealized Losses	(5,357)	(39,595)
12 months or longer, Fair Value	1,053,414	12,018
12 months or longer, Unrealized Losses	(37,023)	(77)
Total Fair Value	1,810,869	1,408,153
Total Unrealized Losses	(42,380)	(39,672)
Equity Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	849	43
Less than 12 months, Unrealized Losses	(198)	(17)
12 months or longer, Fair Value	10	0
12 months or longer, Unrealized Losses	(34)	0
Total Fair Value	859	43
Total Unrealized Losses	$ (232)	$ (17)