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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Narrative Disclosures) (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
loans
Dec. 31, 2017
USD ($)
loans
Dec. 31, 2016
USD ($)
Financing Receivable, Recorded Investment [Line Items]      
SBA loans in the participation sold portfolio, considered impaired $ 13,200,000 $ 11,100,000  
Guaranteed Portion of SBA Loans Sold to Third Parties Total 14,100,000 16,500,000  
Total amount of outstanding SBA loans sold 83,300,000 100,300,000  
Loans and leases transferred to third parties total principal amount 73,900,000 63,600,000  
Gain (Loss) Recognized on Participation Interest in Originated Loans 0 0  
Total amount of outstanding loans transferred to third parties as loan participations 129,700,000 106,400,000  
Total amount of loan participations remaining on the Corporation's balance sheet 208,900,000 181,700,000  
Loans in the participation sold portfolio, considered impaired 0 0  
Loan participations purchased on the Corporation's balance sheet 569,000 650,000  
Residential Real Estate Loans Sold, Principal Amount 0 1,600,000  
Non-accrual troubled debt restructurings 7,600,000 $ 8,800,000  
Unfunded commitments, troubled debt restructurings $ 0    
Financing Receivable, Modifications, Number of Contracts | loans 0 5  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loans   0  
Loans and leases receivable, difference between recorded investment and unpaid principal balance $ 7,100,000 $ 6,600,000 $ 3,400,000
Performing troubled debt restructurings 180,000 332,000 717,000
Impairments of residual value of leased property $ 0 $ 0 $ 0
Commercial and industrial      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable, Modifications, Number of Contracts | loans   4