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Loans (Narrative) (Details)
 3 Months Ended 12 Months Ended 15 Months Ended
Mar. 31, 2021
USD ($)
contract
Mar. 31, 2020
contract
Dec. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Dec. 27, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for sale $ 5,685,000   $ 4,305,000 $ 5,685,000  
Loans 3,604,558,000   3,542,718,000 3,604,558,000  
Past due greater than 90 days and still accruing interest 0   0 $ 0  
Interest income on nonaccrual loans $ 0   0    
Number of loans modified as TDR | contract 0 0      
Number of loans modified as TDR that defaulted within the previous 12 months | contract 0 0      
Days past due when loans are generally placed on nonaccrual status, in days 90 days 90 days      
ASU 2016-13 [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Change in Accounting Principle, Accounting Standards Update, Adopted true     true  
Change in Accounting Principle, Accounting Standards Update, Adoption Date Jan. 01, 2020     Jan. 01, 2020  
Change in retained earnings       $ 8,700,000  
Increase (decrease) in deferred tax assets       3,000,000.0  
ASU 2016-13 [Member] | Held To Maturity Investment Securities [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Increase in the allowance for credit losses on loans       14,000  
Other Assets [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable $ 13,700,000   13,600,000 13,700,000  
Deferral [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 89,100,000   113,000,000.0 89,100,000  
Paycheck Protection Program [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 262,100,000   253,100,000 262,100,000 $ 284,000,000,000
COVID-19 [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans     532,400,000    
Residential Real Estate Loans [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for sale 5,700,000   4,300,000 5,700,000  
Consumer Overdrafts [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past due greater than 90 days and still accruing interest $ 284,000   $ 231,000 284,000  
Loans [Member] | ASU 2016-13 [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Increase in the allowance for credit losses on loans       9,600,000  
Unfunded Commitments [Member] | ASU 2016-13 [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Increase in the allowance for credit losses on loans       $ 2,100,000