Fair Value Measurements (Summary Of Gains And Losses On Level 3 Assets And Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ (1,172)	$ 3,204	$ 3,396	$ 15,338
Change in unrealized gains or losses relating to assets still held	(827)	3,204	3,396	(3,059)
Loans Fees And Sales [Member]
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	106	0	451	0
Change in unrealized gains or losses relating to assets still held	451	0	451	0
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	(57)	(21)	(9)	177
Change in unrealized gains or losses relating to assets still held	(57)	(21)	(9)	173
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	(1,221)	3,225	2,954	15,161
Change in unrealized gains or losses relating to assets still held	$ (1,221)	$ 3,225	$ 2,954	$ (3,232)