Investment Securities (Rollforward Of Total Amount Of Credit-Related OTTI) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Investment [Line Items]
Balance of credit-related OTTI at beginning of period	$ (408,043)		$ (320,986)
Credit-related OTTI not previously recognized	(571)	[1]	(8,544)	[1]
Credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost basis	(27,482)	[2]	(95,517)	[2]
Subtotal of amounts recognized in earnings	28,053		104,061
HTM Securities Transfered to AFS Securities	0		0
Reductions for securities sold during the period	47,768		17,004
Balance of credit-related OTTI at end of period	(185,885)		(408,043)
Reductions for Securities the Company Intends to Sell or Will be Required to Sell Before Recovery of Amortized Cost Basis	202,443		0
Held-To-Maturity [Member]
Investment [Line Items]
Balance of credit-related OTTI at beginning of period	(13,549)		(6,126)
Credit-related OTTI not previously recognized	(403)	[1]	(2,890)	[1]
Credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost basis	0	[2]	(4,533)	[2]
Subtotal of amounts recognized in earnings	403		7,423
HTM Securities Transfered to AFS Securities	4,900		0
Reductions for securities sold during the period	0		0
Balance of credit-related OTTI at end of period	(9,052)		(13,549)
Reductions for Securities the Company Intends to Sell or Will be Required to Sell Before Recovery of Amortized Cost Basis	0		0
Available-for-sale Securities [Member]
Investment [Line Items]
Balance of credit-related OTTI at beginning of period	(394,494)		(314,860)
Credit-related OTTI not previously recognized	(168)	[1]	(5,654)	[1]
Credit-related OTTI previously recognized when there is no intent to sell and no requirement to sell before recovery of amortized cost basis	(27,482)	[2]	(90,984)	[2]
Subtotal of amounts recognized in earnings	27,650		96,638
HTM Securities Transfered to AFS Securities	(4,900)		0
Reductions for securities sold during the period	47,768		17,004
Balance of credit-related OTTI at end of period	(176,833)		(394,494)
Reductions for Securities the Company Intends to Sell or Will be Required to Sell Before Recovery of Amortized Cost Basis	$ 202,443		$ 0

[1] Relates to securities not previously impaired.

[2] Relates to additional impairment on securities previously impaired.