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Loans (Narrative) (Details)
 9 Months Ended
Sep. 30, 2020
USD ($)
contract
Sep. 30, 2019
USD ($)
contract
Dec. 31, 2019
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale $ 7,076,000   $ 4,224,000
Loans 3,519,144,000   3,190,505,000
Past due greater than 90 days and still accruing interest 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  
Other Assets [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accrued interest receivable $ 13,700,000   9,100,000
Paycheck Protection Program [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 270,500,000    
COVID-19 [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 526,700,000    
Residential Real Estate Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for sale 7,100,000   4,200,000
Consumer Overdrafts [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due greater than 90 days and still accruing interest $ 141,000   $ 6,000