Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Details Textual)

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Borrowings (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2013
Acquisition
Mar. 31, 2012
Dec. 31, 2012
Borrowings (Textual) [Abstract]      
Remaining available balance $ 125,000,000   $ 87,000,000
Securities pledged as collateral for FHLB advances 816,900,000   802,200,000
Number of bank acquisitions 2    
Principal 58,500,000    
Subordinated debt interest rate basis LIBOR plus 1.45%    
Three-month LIBOR rate plus 1.45%    
Subordinated debt maturity date Apr. 01, 2016    
Subordinated debt 16,000,000    
Prepayment Penalty 19,600,000    
Amortization expense 426,000 0  
Collateral dependent line of credit with the FHLB $ 1,000,000,000   $ 1,000,000,000