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Securities (Details Textual) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Securities (Additional Textual) [Abstract]          
Securities sold under an agreement to repurchase, secured primarily by mortgage-backed securities at fair value $ 126,400,000   $ 126,400,000   $ 115,400,000
Securities available for sale 199,300,000 52,700,000 229,453,000 115,928,000  
Gross gains on sales of securities available for sale 3,600,000 29,000 4,000,000 1,500,000  
Other than temporary impairment (OTTI) charge on equity investment       38,000  
VISA stock [Member]
         
Securities (Textual) [Abstract]          
Securities pledged for Company's investment in VISA stock 5,800,000   5,800,000   5,700,000
Ohio linked deposit program [Member]
         
Securities (Textual) [Abstract]          
Securities pledged for investment in Ohio Linked Deposit Program $ 412,000   $ 412,000   $ 418,000