Income Taxes - Positive Evidence (Details) (USD $)	0 Months Ended	3 Months Ended								12 Months Ended			15 Months Ended	36 Months Ended	0 Months Ended
	Oct. 23, 2012	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Dec. 31, 2012	Sep. 12, 2012 Preferred Stock
Income Tax Disclosure [Abstract]
Financing receivable, allowance for credit losses, write-downs		$ 49,000,000								$ 51,756,000	$ 28,833,000
Gain (loss) on sale of loans and leases										35,000,000
Gain (loss) on disposition of foreclosed assets		7,000,000
Pre-tax income		(38,531,000)	811,000	1,614,000	3,471,000	2,714,000	6,063,000	(15,183,000)	(1,295,000)	(32,635,000)	(7,701,000)	(1,401,000)	14,700,000	(41,737,000)
Cumulative income position excluding accelerated asset disposition losses														4,700,000
Proceeds from issuance of mandatorily convertible cumulative non-voting perpetual preferred stock	45,000,000
Leverage ratio		9.20%				8.30%				9.20%	8.30%			9.20%
Tier 1 risk-based capital ratio		12.20%				10.60%				12.20%	10.60%			12.20%
Total risk-based capital ratio		13.30%				11.80%				13.30%	11.80%			13.30%
Decrease in nonperforming loans										47,500,000
Nonperforming loans to total assets		1.19%				3.53%				1.19%	3.53%			1.19%
Allowance for loan losses to nonperforming loans		46.69%				110.22%				46.69%	110.22%			46.69%
Valuation allowance, management projection of full utilization, time period		3 years								3 years				3 years
Conversion of Stock [Line Items]
Value of stock converted															$ 21,000,000