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Loans (Details 4) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Nonaccrual loans and loans past due over 90 days still on accrual by portfolio segment    
Nonaccrual $ 18,109 $ 16,567
Past Due Over 90 Days Still on Accrual 284 441
Commercial industrial and agricultural [Member]
    
Nonaccrual loans and loans past due over 90 days still on accrual by portfolio segment    
Nonaccrual 7,354 6,949
Past Due Over 90 Days Still on Accrual 0 10
Commercial mortgages [Member]
    
Nonaccrual loans and loans past due over 90 days still on accrual by portfolio segment    
Nonaccrual 8,530 8,359
Past Due Over 90 Days Still on Accrual 0 122
Residential real estate [Member]
    
Nonaccrual loans and loans past due over 90 days still on accrual by portfolio segment    
Nonaccrual 2,221 1,254
Past Due Over 90 Days Still on Accrual 82 157
Consumer [Member]
    
Nonaccrual loans and loans past due over 90 days still on accrual by portfolio segment    
Nonaccrual 4 5
Past Due Over 90 Days Still on Accrual 187 125
Credit cards [Member]
    
Nonaccrual loans and loans past due over 90 days still on accrual by portfolio segment    
Nonaccrual 0 0
Past Due Over 90 Days Still on Accrual $ 15 $ 27