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Loans - Schedule of Net Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Receivables [Abstract]    
Commercial, industrial, and agricultural $ 263,749 $ 257,091
Commercial mortgages 283,654 261,791
Residential real estate 374,987 347,904
Consumer 58,718 58,668
Credit cards 4,718 4,800
Overdrafts 656 971
Less: unearned discount (3,535) (3,401)
Less: allowance for loan losses (15,500) (14,060)
Net loans $ 967,447 $ 913,764