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General - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Summary Of Significant Accounting Policies [Line Items]      
Each share convertible into shares 69    
Minimum time for conversion 5 years    
Date for redeem shares at face value May 20, 2014    
Series A Preferred Stock
      
Summary Of Significant Accounting Policies [Line Items]      
Dividend Rate 6.00%    
Number of Series A Noncumulative Preferred Stock Shares 17,421 17,421 18,921