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Capital Purchase Program - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Purchase Agreement [Member]
Jun. 30, 2013
Fixed Rate Cumulative Perpetual Preferred Stock, Series B [Member]
Aug. 29, 2012
Fixed Rate Cumulative Perpetual Preferred Stock, Series B [Member]
Jun. 30, 2013
Fixed Rate Cumulative Perpetual Preferred Stock, Series A [Member]
Aug. 29, 2012
Fixed Rate Cumulative Perpetual Preferred Stock, Series A [Member]
Class of Stock [Line Items]              
Number of shares           13,900  
Par value           $ 1.25  
Liquidation preference $ 1,000 $ 1,000   $ 1,000   $ 1,000  
Number of shares       695      
Aggregate purchase price     $ 13.9        
Exercise price 4.00     1.25      
Increase in total capital       $ 13.9      
Cumulative dividends of warrant preferred stock       9.00%      
Cumulative dividends percentage until March 13, 2014     5.00%        
Cumulative dividend thereafter     9.00%        
Closing of sale     Mar. 13, 2009        
Discount on preferred stock amortized period 5 years            
Sale of stock, price         $ 912.50   $ 882.50