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General - Additional Information (Detail) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 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 | 15,921 | 17,421 | 18,921

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- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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