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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