Subsequent Events (Details) (USD $)	9 Months Ended	0 Months Ended
	Sep. 30, 2013	Jul. 02, 2013 Subsequent event Series B Preferred Stock US Treasury	Oct. 24, 2013 Subsequent event Bank of America Credit facility	Oct. 24, 2013 Subsequent event Subordinated debenture due February 2015 Bank of America Subordinated debt	Oct. 24, 2013 Subsequent event Term loan due February 2015 Bank of America Term loan	Nov. 01, 2013 Subsequent event Subordinated debt 6.75% subordinated notes due 2028 U.S. Bank	Nov. 01, 2013 Subsequent event Senior unsecured notes 5% senior unsecured notes due 2028 U.S. Bank
Subsequent Event [Line Items]
Amount of privately placed debentures						$ 65,000,000	$ 5,000,000
Interest rate on debentures						6.75%	5.00%
Amount of debt refinanced by the private placement			55,000,000.0	50.0	5.0
Stock redeemed (in shares)		34,043
Aggregate redemption price	$ 484,000	$ 34,043,000