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Subordinated Debentures - Additional Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 1 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Dec. 30, 2008
Dec. 31, 2012
Other assets [Member]
Dec. 31, 2003
Private offering [Member]
Dec. 31, 2012
Subordinated debentures [Member]
Dec. 31, 2003
Subordinated debentures [Member]
Debt Instrument [Line Items]                
Holding Company, closed a pooled private offering           5,000    
Trust preferred securities with a liquidation amount           $ 1    
Subordinated debentures               $ 5,155
Holding Company's investment in the common stock         155      
Holding Company may redeem the subordinated debentures in a principal amount with integral multiples       $ 1        
Percentage in which holding company redeem subordinated debentures       100.00%        
Maturity date of subordinated debentures             Dec. 30, 2033  
Deferred interest payments $ 42 $ 348 $ 210          
Subordinated debentures have a variable rate of interest 2.85%   2.85%          
Subordinated debentures have a stated rate of interest 3.21%   3.43%