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, 2013	Mar. 31, 2012
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	$ (1,719)	$ 4,114
Change in unrealized gains or losses relating to assets still held	(1,719)	4,123
Loan Fees And Sales [Member]
Gains and Losses included in earnings for Level 3 assets & liabilities [Line Items]
Total gains or losses included in earnings	0	(9)
Change in unrealized gains or losses relating to assets still held	0	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	56	(2)
Change in unrealized gains or losses relating to assets still held	56	(2)
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	(1,775)	4,125
Change in unrealized gains or losses relating to assets still held	$ (1,775)	$ 4,125