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General - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Summary Of Significant Accounting Policies [Line Items]
Number of business segment	1
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	15,471	17,421	17,921

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Date for redeem shares at face value.

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- Definition

Minimum time for conversion of preferred securities in to common stock.

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- Definition

Preferred securities convertible conversion ratio.

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

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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

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