Going Concern, Regulatory Matters and Management's Plans for Recapitalization of the Company - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Maturity date of Floating Rate Junior Subordinated Debentures	Mar. 17, 2014
Line of credit	$ 5.0
Tier 1(Core) capital to adjusted total assets, ratio	8.82%	7.27%
Tier 1(Core) Capital to Risk-Weighted Assets, ratio	13.12%	10.31%
Tier 1 Capital to Total assets ratio,minimum required to be well capitalized	5.00%	5.00%
Total Risk-Based Capital to total Risk-Weighted Assets ratios, minimum required to be well capitalized	10.00%	10.00%
Exchange rate of portion of company's senior line of credit	100.00%
Reduction in line of credit facility	2.5
Private placements or other sales of Company's common stock	5
Issuance of new shares of Company's common stock	17.8
Percentage of outstanding shares of Company's common stock	90.00%
Series A Preferred Stock
Discount Rate on Preferred Stock liquidation amount	50.00%
Series D Fixed Rate Cumulative Perpetual Preferred Stock | Series E Fixed Rate Cumulative Perpetual Preferred Stock
Discount Rate on Preferred Stock liquidation amount	50.00%
Series B Perpetual Preferred Stock | Series C Noncumulative Perpetual Convertible Preferred Stock
Discount Rate on Preferred Stock liquidation amount	50.00%
Minimum
Tier 1(Core) capital to adjusted total assets, ratio	8.00%
Tier 1(Core) Capital to Risk-Weighted Assets, ratio	12.00%
Private placements or other sales of Company's common stock	$ 4