Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Details Textual)

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Borrowings (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 15, 2011
Jun. 17, 2009
Sep. 30, 2012
Mar. 31, 2006
Mar. 31, 2004
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Borrowings (Textual) [Abstract]                
Other Assets     $ 114,413,000     $ 114,413,000 $ 112,699,000 $ 112,395,000
Borrowings (Additional Textual) [Abstract]                
Federal funds lines     85,500,000     85,500,000 113,000,000  
Collateral dependent line of credit with the FHLB     793,200,000     793,200,000 776,800,000  
Subordinated debt interest rate basis       LIBOR plus 1.40% LIBOR rate plus 2.75% LIBOR plus 1.45%    
Capital securities maturity date       Jun. 15, 2036 Jun. 17, 2034      
Securities pledged as collateral for FHLB advances     978,300,000     978,300,000 849,500,000  
Subordinated debt     15,700,000     15,700,000    
Subordinated debt maturity date           Apr. 01, 2016    
Amortization expense     179,000     179,000    
Prepayment Penalty           19,600,000    
Capital securities redeemable at par Jun. 15, 2011 Jun. 17, 2009            
Statutory Trust 1 [Member]
                
Borrowings (Textual) [Abstract]                
Trust Preferred Capital Note, issued         22,500,000      
Interest rate     3.11%     3.11%    
Principal value on debt securities         23,200,000      
Other Assets     696,000     696,000    
Statutory Trust 2 [Member]
                
Borrowings (Textual) [Abstract]                
Trust Preferred Capital Note, issued       36,000,000        
Interest rate     1.76%     1.76%    
Principal value on debt securities       37,100,000        
Other Assets     $ 1,100,000     $ 1,100,000