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Employee Benefit Plans - Additional Information (Detail) (USD $)
1 Months Ended 12 Months Ended
Dec. 31, 1998
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined contribution plan, employer contribution   $ 332,000 $ 336,000
Employee Stock Ownership Plans, shares acquired by the trust 61,501    
Employee stock ownership plan, loan term 10 years    
Employee Stock Ownership Plans, shares allocated to participant accounts   63,133