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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