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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Narrative Disclosures) (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
loans
Dec. 31, 2019
USD ($)
loans
Financing Receivable, Credit Quality Indicator      
SBA Paycheck Protection Program Loans Outstanding, Gross Amount $ 228,900,000 $ 228,900,000  
Paycheck Protection Loans and Leases Receivable, Deferred Income 3,500,000 3,500,000  
SBA loans in the participation sold portfolio, considered impaired 9,300,000 9,300,000 $ 12,100,000
Guaranteed Portion of SBA Loans Sold to Third Parties Total   29,200,000 16,100,000
Total amount of outstanding SBA loans sold 79,500,000 79,500,000 73,800,000
Loans and leases transferred to third parties total principal amount 45,400,000 48,900,000  
Gain (Loss) Recognized on Participation Interest in Originated Loans   0  
Total amount of outstanding loans transferred to third parties as loan participations 153,600,000 153,600,000 142,800,000
Total amount of loan participations remaining on the Corporation's balance sheet 276,500,000 276,500,000 244,600,000
Loans in the participation sold portfolio, considered impaired 3,000,000.0 3,000,000.0  
Loans in the participation sold portfolio, considered impaired, sold amount 4,200,000 4,200,000  
Loans in the participation sold portfolio, considered impaired, charged off amount 2,800,000 2,800,000 0
Loan participations purchased on the Corporation's balance sheet 410,000 410,000 492,000
Non-accrual troubled debt restructurings 6,500,000 6,500,000 15,600,000
Specific Reserves on Troubled Debt Restructurings 760,000 760,000 2,700,000
Unfunded commitments, troubled debt restructurings 0 0  
Loans and leases receivable, difference between recorded investment and unpaid principal balance 14,600,000 14,600,000 9,500,000
Performing troubled debt restructurings $ 46,000 $ 46,000 $ 140,000
Commercial and industrial      
Troubled debt restructurings:      
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans   2 2
Financing Receivable, Troubled Debt Restructuring, Subsequent Default   $ 617,000 $ 2,100,000
Commercial real estate — owner occupied      
Troubled debt restructurings:      
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans   2  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default   $ 272,000