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Securities - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Visa Stock [Member]
Dec. 31, 2012
Visa Stock [Member]
Jun. 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             388,000 417,000
Securities available for sale     97,127,000 229,453,000        
Gross gains on sales of securities available for sale $ 1,900,000 $ 3,600,000 $ 2,600,000 $ 4,000,000