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Securities - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Visa Stock [Member]
Dec. 31, 2012
Visa Stock [Member]
Sep. 30, 2013
Ohio Linked Deposit Program [Member]
Dec. 31, 2012
Ohio Linked Deposit Program [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]                
Securities pledged for Company's participation in the VISA payment processing program         $ 0 $ 5,800,000    
Securities pledged for investment in Ohio Linked Deposit Program             389,000 417,000
Securities available for sale     97,127,000 286,926,000        
Gross gains on sales of securities available for sale $ 0 $ 1,200,000 $ 2,600,000 $ 5,200,000