Fair Value Measurements (Summary Of Gains And Losses On Level 3 Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ (4,765)	$ 367	$ 12,134	$ (1,352)
Change in unrealized gains or losses relating to assets still held	(4,769)	367	(6,263)	(1,352)
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	93	69	198	125
Change in unrealized gains or losses relating to assets still held	89	69	194	125
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	(4,858)	298	11,936	(1,477)
Change in unrealized gains or losses relating to assets still held	$ (4,858)	$ 298	$ (6,457)	$ (1,477)