Investment Securities Available for Sale (Schedule Of Unrealized Loss On Investments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 2,291,995	$ 334,089
Less than 12 Months Unrealized Losses	43,983	3,275
12 Months or Longer, Fair Value	4,713	168,943
12 Months or Longer Unrealized Losses	578	1,359
Total Fair Value	2,296,708	503,032
Total Unrealized Losses	44,561	4,634
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	0	0
Less than 12 Months Unrealized Losses	0	0
12 Months or Longer, Fair Value	0	0
12 Months or Longer Unrealized Losses	0	0
Total Fair Value	0	0
Total Unrealized Losses	0	0
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	0	0
Less than 12 Months Unrealized Losses	0	0
12 Months or Longer, Fair Value	0	0
12 Months or Longer Unrealized Losses	0	0
Total Fair Value	0	0
Total Unrealized Losses	0	0
Securities Issued By U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	0	0
Less than 12 Months Unrealized Losses	0	0
12 Months or Longer, Fair Value	0	0
12 Months or Longer Unrealized Losses	0	0
Total Fair Value	0	0
Total Unrealized Losses	0	0
Mortgage-Backed Securities Issued By U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	121,607	3,314
Less than 12 Months Unrealized Losses	3,363	8
12 Months or Longer, Fair Value	2,951	2
12 Months or Longer Unrealized Losses	298	0
Total Fair Value	124,558	3,316
Total Unrealized Losses	3,661	8
Mortgage-Backed Securities Issued By U.S. Government Sponsored Enterprises [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	1,885,521	286,452
Less than 12 Months Unrealized Losses	31,640	2,229
12 Months or Longer, Fair Value	0	0
12 Months or Longer Unrealized Losses	0	0
Total Fair Value	1,885,521	286,452
Total Unrealized Losses	31,640	2,229
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	282,898	42,036
Less than 12 Months Unrealized Losses	8,875	325
12 Months or Longer, Fair Value	0	168,906
12 Months or Longer Unrealized Losses	0	1,357
Total Fair Value	282,898	210,942
Total Unrealized Losses	8,875	1,682
State And Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	0	0
Less than 12 Months Unrealized Losses	0	0
12 Months or Longer, Fair Value	40	35
12 Months or Longer Unrealized Losses	2	2
Total Fair Value	40	35
Total Unrealized Losses	2	2
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	0	0
Less than 12 Months Unrealized Losses	0	0
12 Months or Longer, Fair Value	0	0
12 Months or Longer Unrealized Losses	0	0
Total Fair Value	0	0
Total Unrealized Losses	0	0
Other Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	1,969	2,287
Less than 12 Months Unrealized Losses	105	713
12 Months or Longer, Fair Value	1,722	0
12 Months or Longer Unrealized Losses	278	0
Total Fair Value	3,691	2,287
Total Unrealized Losses	$ 383	$ 713