Fair Value Measurements (Summary Of Gains And Losses On Level 3 Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ 16,899	$ (1,719)
Change in unrealized gains or losses relating to assets still held	16,899	(1,719)
Other Non-Interest Income [Member]
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	105	56
Change in unrealized gains or losses relating to assets still held	105	56
Investment Securities Gains (Losses), Net [Member]
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	16,794	(1,775)
Change in unrealized gains or losses relating to assets still held	$ 16,794	$ (1,775)