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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Narrative Disclosures) (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
loans
Mar. 31, 2013
Dec. 31, 2013
Financing Receivable, Recorded Investment      
Loans and leases transferred to third parties total principal amount $ 6,200,000 $ 3,800,000  
Loan participations purchased on the Corporation's balance sheet 494,000   498,000
Total amount of outstanding loans transferred to third parties as loan participations 49,100,000   52,100,000
Total amount of loan participations remaining on the Corporations balance sheet 75,000,000   77,200,000
Loans in the participation sold portfolio, considered impaired 0   0
Certain loans acquired in transfer, carrying amount, net 1,400,000   1,400,000
Certain loans acquired in transfer, provision for loan losses 0    
Total gross loans and leases receivable 986,221,000 917,436,000 981,972,000
Non-accrual troubled debt restructurings 7,300,000   8,100,000
Unfunded commitments, troubled debt restructurings 0    
Troubled debt restructurings, subsequent default, number of loans 0    
Loans and leases receivable, difference between recorded investment and unpaid principal balance 3,800,000   4,000,000
Performing troubled debt restructurings 586,000   371,000
Substandard
      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable 21,300,000   22,800,000
Special Mention
      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable 0   0
Doubtful
      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable 0   0
Loss
      
Financing Receivable, Recorded Investment      
Total gross loans and leases receivable $ 0   $ 0