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, 2013	Sep. 30, 2012
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	$ 1,396,178	$ 205,205
Less than 12 months, Unrealized Losses	(39,612)	(896)
12 months or longer, Fair Value	12,018	0
12 months or longer, Unrealized Losses	(77)	0
Total Fair Value	1,408,196	205,205
Total Unrealized Losses	(39,689)	(896)
Collateralized Mortgage Obligations [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	1,241,836	205,205
Less than 12 months, Unrealized Losses	(36,025)	(896)
12 months or longer, Fair Value	12,018	0
12 months or longer, Unrealized Losses	(77)	0
Total Fair Value	1,253,854	205,205
Total Unrealized Losses	(36,102)	(896)
Mortgage Backed Securities Issued By U S Government Sponsored Enterprises [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	154,299
Less than 12 months, Unrealized Losses	(3,570)
12 months or longer, Fair Value	0
12 months or longer, Unrealized Losses	0
Total Fair Value	154,299
Total Unrealized Losses	(3,570)
Total debt securities
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	1,396,135
Less than 12 months, Unrealized Losses	(39,595)
12 months or longer, Fair Value	12,018
12 months or longer, Unrealized Losses	(77)
Total Fair Value	1,408,153
Total Unrealized Losses	(39,672)
Equity Securities [Member]
Schedule of Investments [Line Items]
Less than 12 months, Fair Value	43
Less than 12 months, Unrealized Losses	(17)
12 months or longer, Fair Value	0
12 months or longer, Unrealized Losses	0
Total Fair Value	43
Total Unrealized Losses	$ (17)