Junior Subordinated Debentures (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2009 Dodd-Frank Act [Member]
Junior Subordinated Debentures [Line Items]
Common stock issued by Trusts	$ 6,900,000		$ 6,900,000		$ 7,200,000
Term of LIBOR variable base rate			3 months
Loss on junior subordinated debentures carried at fair value	554,000	554,000	1,643,000	1,649,000
Total assets	$ 11,569,297,000		$ 11,569,297,000		$ 11,795,443,000	$ 15,000,000,000
Restricted core capital percentage	18.80%		18.80%