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Loans (Narrative) (Details)
 9 Months Ended 12 Months Ended 21 Months Ended
Sep. 30, 2021
USD ($)
Contract
Sep. 30, 2020
Contract
Dec. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
Dec. 27, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for sale $ 5,916,000   $ 4,305,000 $ 5,916,000  
Investment securities, past due 3,609,791,000   3,557,908,000 3,609,791,000  
Loans 3,608,455,000   3,542,718,000 3,608,455,000  
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 $ 12,800,000   13,600,000 12,800,000  
Deferral [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 61,400,000   113,000,000.0 61,400,000  
30 to 59 Days Past Due [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Investment securities, past due 16,943,000   6,209,000 16,943,000  
Paycheck Protection Program [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 121,400,000   253,100,000 121,400,000 $ 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     4,300,000    
Investment securities, past due 570,435,000   586,537,000 570,435,000  
Residential Real Estate Loans [Member] | 30 to 59 Days Past Due [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Investment securities, past due 543,000   984,000 543,000  
Consumer Overdrafts [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past due greater than 90 days and still accruing interest 1,000   231,000 1,000  
Commercial Business [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Investment securities, past due 689,819,000   798,409,000 689,819,000  
Commercial Business [Member] | 30 to 59 Days Past Due [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Investment securities, past due 11,489,000   $ 264,000 11,489,000  
Commercial Business [Member] | Paycheck Protection Program [Member] | 30 to 59 Days Past Due [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Investment securities, past due $ 11,400,000     11,400,000  
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