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, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	$ 1,482	$ 2,600	$ 5,596	$ 3,662
Change in unrealized gains or losses relating to assets still held	607	2,713	4,580	4,144
Loan Fees And Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	0	(34)	(9)	(403)
Change in unrealized gains or losses relating to assets still held	0	79	0	79
Other Non-Interest Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	7	29	5	35
Change in unrealized gains or losses relating to assets still held	7	29	5	35
Investment Securities Gains (Losses), Net [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	1,475	2,605	5,600	4,030
Change in unrealized gains or losses relating to assets still held	$ 600	$ 2,605	$ 4,575	$ 4,030