Junior Subordinated Debentures (Narrative) (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010	Dec. 31, 2009
Junior Subordinated Debentures
Common Stock Issued By Trust Owned		$ 6,900,000
Total assets	11,459,692,000	11,459,692,000		11,668,710,000	15,000,000,000
Restricted Core Capital Percentage	18.00%	18.00%
Gain Loss On Changes In Fair Value Of Junior Subordinated Debentures	$ (547,000)	$ (1,089,000)	$ 6,088,000