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Hedging Activities - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 1 Months Ended
Jun. 30, 2011
Sep. 30, 2013
Dec. 31, 2012
Feb. 29, 2012
Jun. 30, 2011
Interest rate cap contracts [Member]
Feb. 29, 2012
Basis Swap [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Notional amounts of interest rate swap agreement and purchased interest rate cap         $ 100,000,000 $ 32,000,000
Notional amount of sold interest rate cap 100,000,000          
Rate used to determine payment received from correspondent bank on notional amount of interest rate swap/Basis for determining strike rate on purchased interest rate cap 30-Day Libor rate         90-Day Libor Rate
Strike rate of sold interest rate cap in basis points above strike rate on purchased interest rate cap 1.25%          
Fixed spread added to the variable rate on our subordinated debentures           2.18%
Subordinated debentures interest rate index           90-Day Libor Rate
Subordinated debentures       32,000,000    
Present value of Interest rate swap, record as liability   400,000 1,100,000      
Cap corridor maturity   2013-06        
Interest rate swap agreement effective date   2013-01        
Interest rate swap agreement maturity date   2018-01        
Payment made under interest rate cap contract   $ 0