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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

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