Investment Securities (Proceeds From Sales Of Securities And Components Of Investment Securities Gains And Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Investment [Line Items]
Proceeds from sales of available for sale securities	$ 5,231	$ 11,202	$ 78,448
Proceeds from sales of non-marketable securities	11,644	8,631	192
Total proceeds	16,875	19,833	78,640
Other-than-temporary impairment recognized on debt securities	(1,490)	(2,537)	(5,069)
Investment securities gains (losses), net	4,828	10,812	(1,785)
Available For Sale [Member]
Investment [Line Items]
Gains realized on sales	358	177	3,639
Losses realized on sales	0	0	(151)
Other-than-temporary impairment recognized on debt securities	(1,490)	(2,537)	(5,069)
Non-Marketable [Member]
Investment [Line Items]
Gains realized on sales	1,655	2,388	52
Losses realized on sales	(200)	0	0
Fair value adjustments, net	$ 4,505	$ 10,784	$ (256)