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Hedging Activities (Details Textual ) (USD $)
 1 Months Ended 6 Months Ended 1 Months Ended
Jun. 30, 2011
BasisPoints
Jun. 30, 2013
Dec. 31, 2012
Feb. 29, 2012
Feb. 29, 2012
Basis Swap [Member]
BasisPoints
Jun. 30, 2011
Interest rate cap contracts [Member]
Hedging Activities (Textual) [Abstract]            
Notional amounts of interest rate swap agreement and purchased interest rate cap         $ 32,000,000 $ 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  
Subordinated debentures interest rate index         90-Day Libor Rate  
Fixed spread added to the variable rate on our subordinated debentures         218  
Hedging Activities (Additional Textual) [Abstract]            
Strike rate of sold interest rate cap in basis points above strike rate on purchased interest rate cap 125          
Notional amount of sold interest rate cap 100,000,000          
Payment made under interest rate cap contract   0        
Subordinated debentures       32,000,000    
Interest rate swap agreement effective date   2013-01        
Interest rate swap agreement maturity date   2018-01        
Present value of Interest rate swap, record as liability   $ 200,000 $ 1,100,000      
Cap corridor maturity   2013-06