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Loans - Schedule of Net Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Receivables [Abstract]    
Commercial, industrial, and agricultural $ 424,059 $ 427,715
Commercial mortgages 338,445 343,465
Residential real estate 494,799 459,114
Consumer 67,753 63,491
Credit cards 5,079 5,065
Overdrafts 445 409
Less: unearned discount (4,205) (3,896)
Less: allowance for loan losses (17,843) (16,234)
Net loans $ 1,308,532 $ 1,279,129