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Capital - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended	18 Months Ended
	Jun. 19, 2012	Dec. 31, 2013	Dec. 31, 2013	Jan. 29, 2013	Jun. 30, 2009 Dividend Reinvestment Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Announcement of common stock repurchase program	$ 50
Number of shares authorized to be repurchased				25,000,000
Stock repurchased (in shares)			10,116,039
Average price per share		$ 6.88
Shares issued in public offering					5,000,000

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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