Subsequent Events (Details) (USD $) In Millions, except Share data, unless otherwise specified				0 Months Ended				0 Months Ended		0 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Pro Forma [Member]	Mar. 20, 2009 Series A senior preferred stock	Jun. 30, 2013 Series A senior preferred stock	Jun. 30, 2013 Bank	Dec. 31, 2012 Bank	Jul. 17, 2013 Subsequent Events Series A senior preferred stock	Jul. 31, 2013 Subsequent Events Series A senior preferred stock	Jul. 29, 2013 Subsequent Events Common Stock	Jul. 31, 2013 Subsequent Events Bank
Subsequent events
Amount of dividend approved for repurchase of shares											$ 25
Repurchase of shares									21,000
Number of shares to be purchased against warrants					611,650					611,650
Amount of shares repurchased, including accrued but unpaid dividends								21.2
Issuance of stock (in shares)				$ 21.0						$ 1.6
Pro-forma regulatory capital ratios
Tier 1 Leverage (as a percent)	12.60%	12.32%	10.50%			12.26%	11.93%
Total Risk-Based Capital (as a percent)	17.03%	16.81%	14.40%			16.57%	16.28%