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, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Total gains or losses included in earnings	$ 3,305	$ 1,539	$ 6,967	$ (1,210)
Change in unrealized gains or losses relating to assets still held	3,158	1,644	7,249	(780)
Loan Fees and Sales [Member]
Total gains or losses included in earnings	160	194	(243)	73
Change in unrealized gains or losses relating to assets still held	239	281	239	281
Other Non-Interest Income [Member]
Total gains or losses included in earnings	224	(7)	259	6
Change in unrealized gains or losses relating to assets still held	(2)	11	(16)	28
Investment Securities Gains (Losses), Net [Member]
Total gains or losses included in earnings	2,921	1,352	6,951	(1,289)
Change in unrealized gains or losses relating to assets still held	$ 2,921	$ 1,352	$ 7,026	$ (1,089)