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Regulatory Order Considerations and Management's Plans - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 20, 2012 | Aug. 09, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Aug. 30, 2012 | May 04, 2012
Regulatory Order Considerations And Management Plans [Line Items] |  |  |  |  |  |  |
Core capital |  |  | 8.00% |  |  |  |
Risk-based capital |  |  | 12.00% |  |  |  |
Brokered deposits |  |  | $ 32,095 |  |  |  |
Unpledged securities and deposits in other financial institutions |  |  | 32,396 |  |  |  |
Registered common stock offering, maximum |  | 30,000,000 |  |  |  |  |
Rights offering | 18,000,000 | 24,965,000 |  |  |  |  |
Offering to a group of standby purchasers | 4,500,000 | 5,035,000 |  |  |  |  |
Reverse stock split |  |  |  |  |  |  | 0.2
Number of share purchase rights entitled to holder | 14.5329 | 6.0474 |  |  |  |  |
Common stock, subscription price | 1.50 | 1.00 |  |  |  |  |
Shares available to public, price per share | $ 1.50 | $ 1.00 |  |  |  |  |
One warrant to purchase one additional share of common stock at a purchase price |  | $ 1.00 |  |  |  |  |
Exercisable period for warrants |  | 3 years |  |  |  |  |
Standby purchasers entitled to acquire |  | 5,000,000 |  |  |  | 3,000,000 |
Standby purchasers entitled to acquire, purchase price | $ 1.00 |  |  |  |  | $ 1.50 |
Purchase of shares of common stock upon the receipt, minimum |  | 16,500,000 |  |  |  |  |
Rights offering period expiry date | Jul. 16, 2012 |  |  |  |  |  |
Unsubscribed shares issuing, beginning balance | Jul. 17, 2012 |  |  |  |  |  |
Purchase of shares of common stock upon the receipt, minimum | 13,500,000 |  |  |  |  |  |
Sale of common stock | 15,000,000 |  | 15,936,417 | 937,417 |  |  |
Common stock price per share | $ 1.50 |  |  |  |  |  |
Gross proceeds from common stock | 20,221,000 |  | 20,221,000 |  |  |  |
Expenses for issuance of stock | 2,279,000 |  |  |  |  |  |
Cash available |  |  | 4,673,000 |  |  |  |
Redemption of TARP obligations |  |  | 3,000,000 |  |  |  |
Capital contribution |  |  | $ 13,500,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Regulatory Order Considerations And Management Plans [Line Items] |  |  |  |  |  |  |
Brokered deposits maturity date |  |  | January 2013 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Regulatory Order Considerations And Management Plans [Line Items] |  |  |  |  |  |  |
Brokered deposits maturity date |  |  | August 2016 |  |  |  |

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