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Loans (Narrative) (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
contract
Dec. 31, 2019
USD ($)
contract
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 3,542,718,000 $ 3,190,505,000  
Loans, related parties 32,800,000 18,600,000  
Loans, related parties, new borrowings 16,300,000    
Loans, related parties, repayments and other reductions 2,100,000    
Past due greater than 90 days and still accruing interest 0 0  
Interest income recognized on nonaccrual loans 0 0 $ 0
Estimated interest income $ 430,000 $ 508,000 $ 294,000
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 $ 6,000  
Other Assets [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest receivable 13,600,000 $ 9,100,000  
Deferral [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 113,000,000.0    
Paycheck Protection Program [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 253,100,000    
COVID-19 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans $ 532,400,000