Investment Securities (Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011
Investment [Line Items]
Proceeds from sales of available for sale securities			$ 4,951		$ 11,202
Proceeds from sales of non-marketable securities			9,980		497
Total proceeds			14,931	[1]	11,699	[1]
Other-than-temporary impairment recognized on debt securities	(557)	(831)	(1,227)		(1,755)
Investment securities gains, net	3,180	2,587	8,556	[1]	5,870	[1]
Available For Sale [Member]
Investment [Line Items]
Gains realized on sales			342		177
Other-than-temporary impairment recognized on debt securities			(1,227)		(1,755)
Non-Marketable [Member]
Investment [Line Items]
Gains realized on sales			1,267		497
Losses realized on sales			(200)		0
Fair value adjustments, net			$ 8,374		$ 6,951

[1] Available for sale and non-marketable securities