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Derivative Instruments - Additional Information (Detail) (USD $)
 1 Months Ended 6 Months Ended 6 Months Ended
May 31, 2011
Aug. 31, 2008
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Jun. 30, 2013
Interest Rate Swaps [Member]
Jun. 30, 2012
Interest Rate Swaps [Member]
Jun. 30, 2013
LIBOR Plus 155 Basis Points [Member]
Jun. 30, 2012
LIBOR Plus 155 Basis Points [Member]
Jun. 30, 2013
4.29% Fixed Rate Plus 155 Basis Points [Member]
Jun. 30, 2012
4.29% Fixed Rate Plus 155 Basis Points [Member]
Jun. 30, 2013
4.02% Fixed Rate Plus 155 Basis Points [Member]
Jun. 30, 2012
4.02% Fixed Rate Plus 155 Basis Points [Member]
Derivative [Line Items]                          
Term of interest rate swap agreement executed   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 involves the receipt of variable-rate amounts in exchange for fixed-rate payments from August 1, 2008 to September 15, 2013 without exchange of the underlying notional amount.                      
Interest rate swap inception date     Aug. 01, 2008                    
Interest rate swap maturity date     Sep. 15, 2013                    
Variable rate on the subordinated debt on effective date in case of interest rate swap               LIBOR plus 155 basis points LIBOR plus 155 basis points 4.29% fixed rate plus 155 basis points 4.29% fixed rate plus 155 basis points 4.02% fixed rate plus 155 basis points 4.02% fixed rate plus 155 basis points
Variable interest rate on subordinate debt     1.82%                    
Interest rate being paid by the corporation                   5.84%   5.57%  
Derivative variable rate basis     1.55%   4.02% 1.55% 4.29%            
Line Of Credit, Basis Spread on LIBOR     1.55%                    
Derivatives designated as fair value hedges     0                    
Accumulated other comprehensive loss estimated     380,000                    
Collateral amount for counterparty interest rate swap     $ 1,950,000 $ 1,950,000