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Loans (Details 5) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Nonaccrual loans and loans past due over 90 days still accruing interest by class of loans    
Nonaccrual $ 16,187 $ 14,445
Past Due Over 90 Days Still on Accrual 221 357
Commercial, industrial, and agricultural [Member]
    
Nonaccrual loans and loans past due over 90 days still accruing interest by class of loans    
Nonaccrual 2,725 3,073
Past Due Over 90 Days Still on Accrual 0 0
Commercial mortgages [Member]
    
Nonaccrual loans and loans past due over 90 days still accruing interest by class of loans    
Nonaccrual 10,986 8,570
Past Due Over 90 Days Still on Accrual 0 109
Residential real estate [Member]
    
Nonaccrual loans and loans past due over 90 days still accruing interest by class of loans    
Nonaccrual 2,467 2,792
Past Due Over 90 Days Still on Accrual 0 18
Consumer [Member]
    
Nonaccrual loans and loans past due over 90 days still accruing interest by class of loans    
Nonaccrual 9 10
Past Due Over 90 Days Still on Accrual 208 217
Credit cards [Member]
    
Nonaccrual loans and loans past due over 90 days still accruing interest by class of loans    
Nonaccrual 0 0
Past Due Over 90 Days Still on Accrual $ 13 $ 13