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General - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Summary Of Significant Accounting Policies [Line Items]
Number of business segment	1
Each share convertible into shares	69
Preferred stock redemption date	May 20, 2016
Series A Preferred Stock
Summary Of Significant Accounting Policies [Line Items]
Dividend Rate	6.00%
Number of Series A Noncumulative Preferred Stock Shares	15,151	15,251	15,921

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Number of shares issued for each share of convertible preferred stock that is converted.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

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-Publisher SEC

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

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Date the preferred stock has been redeemed, in CCYY-MM-DD format.

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-Publisher FASB

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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.

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