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Regulatory Matters (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2012
Jul. 31, 2012
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Jul. 03, 2012
Dec. 31, 2011
Dec. 31, 2009
May 15, 2009
Regulatory Matters (Textual) [Abstract]                    
Maximum level of consolidated aggregate assets allowing for inclusion of trust preferred securities in Tier 1 Capital under Dodd-Frank Act                 $ 15,000,000,000  
Outstanding balance of trust preferred securities     32,000,000   32,000,000     32,000,000    
Aggregate amount of restricted core elements allowed in Tier 1 capital         25.00%          
Number of common stock shares available to U.S. Treasury under warrant issued to it on May 15, 2009                   616,438
Price per share of common stock available to U.S. Treasury under warrant issued to it on May 15, 2009                   5.11
Repurchase price of warrant   7,500,000     7,465,000 0        
Cash dividend paid by bank to parent company to fund the repurchase of the warrant     7,800,000              
Reduction in retained earnings resulting from repurchase of warrant             $ 7,500,000      
Dividend payable date   Jul. 02, 2012     Dec. 10, 2012          
Dividend declared date Oct. 11, 2012                  
Cash dividend on common stock $ 0.09   $ 0.00 $ 0.00 $ 0.00 $ 0.00