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Loans (Narrative) (Details)
 3 Months Ended
Mar. 31, 2022
USD ($)
Contract
Mar. 31, 2021
USD ($)
Contract
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 27, 2020
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held for sale $ 5,544,000   $ 6,202,000    
Investment securities, past due 3,682,988,000   3,631,355,000    
Loans 3,692,682,000   3,639,760,000    
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      
Estimated interest income $ 161,000 $ 142,000      
Other Assets [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable 12,600,000        
Deferral [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 6,400,000   46,200,000    
30 to 59 Days Past Due [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Investment securities, past due 18,488,000   7,721,000    
Paycheck Protection Program [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans         $ 284,000,000,000
Past due greater than 90 days and still accruing interest 380,000   797,000    
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 5,500,000        
Investment securities, past due 561,208,000   563,579,000    
Residential Real Estate Loans [Member] | 30 to 59 Days Past Due [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Investment securities, past due 919,000   1,148,000    
Consumer Overdrafts [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Past due greater than 90 days and still accruing interest 2,000   1,000    
Commercial Business [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Investment securities, past due 625,238,000   639,368,000    
Commercial Business [Member] | 30 to 59 Days Past Due [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Investment securities, past due $ 762,000   $ 659,000