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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, 2019
USD ($)
loans
Dec. 31, 2018
USD ($)
loans
Financing Receivable, Credit Quality Indicator    
SBA loans in the participation sold portfolio, considered impaired $ 12,100,000 $ 13,700,000
Guaranteed Portion of SBA Loans Sold to Third Parties Total 16,100,000 17,400,000
Total amount of outstanding SBA loans sold 73,800,000 83,300,000
Loans and leases transferred to third parties total principal amount 45,400,000 73,900,000
Gain (Loss) Recognized on Participation Interest in Originated Loans 0  
Total amount of outstanding loans transferred to third parties as loan participations 142,800,000 129,700,000
Total amount of loan participations remaining on the Corporation's balance sheet 244,600,000 208,900,000
Loans in the participation sold portfolio, considered impaired 0 0
Loan participations purchased on the Corporation's balance sheet 492,000 569,000
Non-accrual troubled debt restructurings 15,600,000 7,600,000
Specific Reserves on Troubled Debt Restructurings 2,700,000 $ 1,500,000
Unfunded commitments, troubled debt restructurings $ 0  
Financing Receivable, Modifications, Number of Contracts | loans 17 0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans   0
Loans and leases receivable, difference between recorded investment and unpaid principal balance $ 9,500,000 $ 7,100,000
Performing troubled debt restructurings $ 140,000 $ 180,000
Commercial and industrial    
Financing Receivable, Credit Quality Indicator    
Financing Receivable, Modifications, Number of Contracts | loans 15  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans 2  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default $ 2,100,000  
Commercial real estate — owner occupied    
Financing Receivable, Credit Quality Indicator    
Financing Receivable, Modifications, Number of Contracts | loans 2