Capital Issuance and Redemption (Details) (USD $)	0 Months Ended	12 Months Ended				0 Months Ended	12 Months Ended	0 Months Ended		12 Months Ended		0 Months Ended						12 Months Ended	0 Months Ended		0 Months Ended	12 Months Ended	0 Months Ended
	Sep. 28, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 15, 2011	Sep. 15, 2011 Series C Preferred Stock	Dec. 31, 2012 Series C Preferred Stock	Sep. 15, 2011 Series B Preferred Stock	Sep. 28, 2011 Common Stock	Dec. 31, 2012 Minimum	Dec. 31, 2012 First Quarter of 2013 Series C Preferred Stock	Sep. 15, 2011 Issuance Date through September 30, 2011 Series C Preferred Stock	Sep. 15, 2011 2nd through 10th Calendar Quarters Minimum Series C Preferred Stock	Sep. 15, 2011 2nd through 10th Calendar Quarters Maximum Series C Preferred Stock	Sep. 15, 2011 11th Calendar Quarter through March 15, 2016 Minimum Series C Preferred Stock	Sep. 15, 2011 11th Calendar Quarter through March 15, 2016 Maximum Series C Preferred Stock	Sep. 15, 2011 After 4.5 Years from March 15, 2016 Series C Preferred Stock	Dec. 31, 2012 Second Quarter of 2013 Series C Preferred Stock	Sep. 15, 2011 Minimum Outstanding Aggregate Liquidation Amount Has Been Met Series C Preferred Stock director	Sep. 15, 2011 Minimum Outstanding Aggregate Liquidation Amount Has Been Met Minimum Series C Preferred Stock	Sep. 15, 2011 Secretary of the Treasury Series C Preferred Stock	Dec. 31, 2012 Secretary of the Treasury Series C Preferred Stock	Sep. 15, 2011 Right to Appoint a Representative as an Observer on the Board Series C Preferred Stock dividend_payment	Sep. 15, 2011 Right to Designate Two Directors to the Board Minimum Outstanding Aggregate Liquidation Amount Has Been Met Series C Preferred Stock dividend_payment
Class of Stock [Line Items]
Preferred stock, shares issued																					81,698
Liquidation value per share (in usd per share)		$ 1,000																			$ 1,000
Preferred stock, dividend rate							1.00%				2.00%	5.00%	1.00%	5.00%	1.00%	7.00%	9.00%	1.00%
Increase in Qualified Small Business Lending Fund to trigger decrease in dividend rate										2.50%
Capital Purchase Plan Fund, quarterly lending incentive fee, percentage						0.50%
Capital Purchase Plan Fund, annual lending incentive fee, percentage						2.00%
Dividend rate and lending incentive fee, percentage						9.00%
Baseline level, Small Business Lending Fund						$ 923,000,000
Required increase in Qualified Small Business Lending Fund						92,300,000
Increase in Qualified Small Business Lending Fund							123,000,000
Increase in Qualified Small Business Lending Fund, percentage							12.10%
Number of dividend payments missed																							5	6
Preferred Stock, liquidation preference, value																				25,000,000
Proceeds from issuance of preferred stock		0	81,698,000	0																	81,700,000	81,700,000
Number of directors that can be designated to the Board																			2
Tier 1 Capital to Dividend Threshold, minimum					90.00%
Tier 1 Capital		463,371,000	427,145,000		312,500,000
Reduction in Tier 1 Dividend Threshold, percentage						10.00%
Stock redeemed during the period (in shares)								81,698
Payments for Repurchase of Preferred Stock and Preference Stock		0	81,698,000	0				81,700,000
Redemption price								81,700,000
Value of warrants issued								6,300,000
Carrying value of preferred stock								75,400,000
Preferred stock redemption discount								6,300,000
Preferred stock redemption discount, amortization period								5 years
Preferred stock redemption discount, unamortized								2,600,000
Number of shares to repurchased in the warrant									609,687
Common stock, par value (in usd per share)	$ 1.00	$ 1	$ 1
Warrant exercise price	20.10
Payments for the repurchase of the warrant	$ 1,800,000	$ 0	$ 1,800,000	$ 0