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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Narrative Disclosures) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]          
Financing Receivable, Modifications, Subsequent Default, Number of Contracts     0    
Total amount of SBA loan participations remaining on the corporations balance sheet $ 62,100   $ 62,100 $ 53,200  
Loans and leases transferred to third parties total principal amount 17,600 $ 26,800      
Gain (Loss) Recognized on Participation Interest in Originated Loans     0    
Gain on sale of SBA loans     4,400 3,999 $ 318
Loan participations purchased on the Corporation's balance sheet 1,200   1,200 1,800  
Total amount of outstanding loans transferred to third parties as loan participations 102,700   102,700 91,000  
Total amount of loan participations remaining on the Corporation's balance sheet 106,100   106,100 110,600  
Loans in the participation sold portfolio, considered impaired 0   0 0  
Residential Real Estate Loans Sold, Principal Amount     26,300 32,600  
Loans to executive officers, directors and their related interests 6,300   6,300 6,900  
New loans granted to executive officers, directors and their related interests     700 3,900  
Repayments on loans to executive officers, directors and their related interests     1,300 1,366  
Loans and leases receivable, related parties, impaired 0   0 0  
Total gross loans and leases receivable 1,451,864   1,451,864 1,432,027  
Non-accrual troubled debt restructurings 12,800   12,800 16,200  
Unfunded commitments, troubled debt restructurings 0   0    
Loans and leases receivable, difference between recorded investment and unpaid principal balance 3,400   3,400 3,900 4,400
Performing troubled debt restructurings 717   717 1,735 2,003
Impairments of residual value of leased property     0 0 $ 0
SBA loans in the participation sold portfolio, considered impaired 5,500   5,500 1,100  
Guaranteed Portion of SBA Loans Sold to Third Parties Total     41,200 40,200  
Total amount of outstanding SBA loans sold 105,100   105,100 78,200  
Unguaranteed portion of Sold SBA Loans Retained on the Balance Sheet 32,200   32,200 26,200  
Substandard          
Financing Receivable, Recorded Investment [Line Items]          
Total gross loans and leases receivable 34,300   34,300 26,800  
Special Mention          
Financing Receivable, Recorded Investment [Line Items]          
Total gross loans and leases receivable 0   0 0  
Doubtful          
Financing Receivable, Recorded Investment [Line Items]          
Total gross loans and leases receivable 0   0 0  
Loss          
Financing Receivable, Recorded Investment [Line Items]          
Total gross loans and leases receivable $ 0   $ 0 $ 0