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Derivative Instruments - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended
May 03, 2011
Aug. 31, 2008
Sep. 30, 2013
Dec. 31, 2007
Dec. 31, 2012
Derivative [Line Items]          
Term of interest rate swap agreement executed 5 years 5 years      
Value of subordinated note hedged       $ 10,000,000  
Interest rate The interest rate swap involves the receipt of variable-rate amounts in exchange for fixed-rate payments from September 15, 2013 to September 15, 2018 without exchange of the underlying notional amount. The interest rate swap involved the receipt of variable-rate amounts in exchange for fixed-rate payments from September 15, 2008 to the September 15, 2013 maturity date without exchange of the underlying notional amount.      
Interest rate swap inception date     Sep. 15, 2008    
Interest rate swap maturity date     Sep. 15, 2013    
Derivatives designated as fair value hedges     0    
Accumulated other comprehensive loss estimated     377,000    
Collateral amount for counterparty interest rate swap     $ 1,350,000   $ 1,950,000
Interest Rate Swaps [Member]
          
Derivative [Line Items]          
Derivative fixed interest rate rate basis     4.02%    
Derivative basis spread on variable rate     1.55%    
LIBOR Plus 155 Basis Points [Member]
          
Derivative [Line Items]          
Variable rate on the subordinated debt on effective date in case of interest rate swap     LIBOR plus 155 basis points    
Variable interest rate on subordinate debt     1.80%    
4.02% Fixed Rate Plus 155 Basis Points [Member]
          
Derivative [Line Items]          
Variable rate on the subordinated debt on effective date in case of interest rate swap     4.02% fixed rate plus 155 basis points    
Interest rate being paid by the corporation     5.57%