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Capital - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 19, 2012 | Sep. 30, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Jun. 30, 2009 Dividend Reinvestment Plan [Member]
Announcement of common stock repurchase program | $ 50,000,000 |  |  |  |  |  |
Repurchase of shares |  |  | 5,662,083 |  |  |  |
Average price per share |  |  | $ 6.62 |  |  |  |
Shares issued in public offering |  | 18,543,750 |  |  |  |  | 5,000,000
Common stock, par value |  | $ 4.65 |  |  |  |  |
Public offering, additional capital |  | 86,200,000 | 0 | 144,000 | 83,913,000 |  |
Stock offering capitalized |  | 4,800,000 |  |  |  |  |
Net proceeds from capitalization |  | 81,400,000 |  |  |  |  |
Shares issued under reinvestment plan |  |  |  |  | 1,116,810 |  |
Treasury stock acquired, shares |  |  |  |  | 745,912 | 97,905 |
Treasury stock reissued |  |  | $ 1,028,000 | $ 72,000 | $ 4,248,000 | $ 400,000 |

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