Annual report pursuant to Section 13 and 15(d)

Borrowings (Details Textual)

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Borrowings (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2006
Mar. 31, 2004
Dec. 31, 2012
Dec. 31, 2011
Borrowings (Textual) [Abstract]        
Subordinated debt interest rate basis     LIBOR plus 1.45%  
Other Assets     $ 113,844,000 $ 112,699,000
Borrowings (Additional Textual) [Abstract]        
Remaining available balance     87,000,000 113,000,000
Collateral dependent line of credit with the FHLB     1,000,000,000 849,500,000
Subordinated debt interest rate basis     LIBOR plus 1.45%  
Securities pledged as collateral for FHLB advances     802,200,000 776,800,000
Subordinated debt     15,900,000  
Subordinated debt maturity date     Apr. 01, 2016  
Amortization expense     612,000 0
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    
Subordinated debt interest rate basis   LIBOR rate plus 2.75%    
Interest rate     3.06%  
Principal value on debt securities   23,200,000    
Other Assets     696,000  
Capital securities maturity date   Jun. 17, 2034    
Borrowings (Additional Textual) [Abstract]        
Subordinated debt interest rate basis   LIBOR rate plus 2.75%    
Statutory Trust 2 [Member]
        
Borrowings (Textual) [Abstract]        
Trust Preferred Capital Note, issued 36,000,000      
Subordinated debt interest rate basis LIBOR plus 1.40%      
Interest rate     1.71%  
Principal value on debt securities 37,100,000      
Other Assets     $ 1,100,000  
Capital securities maturity date Jun. 15, 2036      
Borrowings (Additional Textual) [Abstract]        
Subordinated debt interest rate basis LIBOR plus 1.40%