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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ (2,785)	$ (1,172)	$ (6,040)	$ 3,396
Change in unrealized gains or losses relating to assets still held	(1,995)	(827)	(5,677)	3,396
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	86	106	613	451
Change in unrealized gains or losses relating to assets still held	876	451	876	451
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	50	(57)	(8)	(9)
Change in unrealized gains or losses relating to assets still held	50	(57)	(8)	(9)
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	(2,921)	(1,221)	(6,645)	2,954
Change in unrealized gains or losses relating to assets still held	$ (2,921)	$ (1,221)	$ (6,545)	$ 2,954