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Loans (Narrative) (Details)
 12 Months Ended
Dec. 31, 2021
USD ($)
Contract
Dec. 31, 2020
USD ($)
Contract
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 3,639,760,000 $ 3,542,718,000  
Loans, related parties 44,700,000 32,800,000  
Loans, related parties, new borrowings 19,000,000.0    
Loans, related parties, repayments and other reductions 7,100,000    
Interest income recognized on nonaccrual loans 0 0 $ 0
Estimated interest income $ 211,000 $ 430,000 $ 508,000
Number of loans modified as TDR | Contract 0 0  
Number of loans modified as TDR that defaulted | Contract 0 0  
Days past due when loans are generally placed on nonaccrual status, in days 90 days 90 days  
Consumer Overdrafts [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due greater than 90 days and still accruing interest   $ 231,000  
Other Assets [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest receivable $ 12,700,000 13,600,000  
Deferral [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 46,200,000 113,000,000.0  
Paycheck Protection Program [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 57,500,000 253,100,000  
Past due greater than 90 days and still accruing interest $ 797,000    
COVID-19 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans   $ 532,400,000