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Loans and Allowance for Loan Losses - Additional Information (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Loan
Property
Sep. 30, 2019
Loan
Property
Sep. 30, 2020
USD ($)
Loan
Property
Sep. 30, 2019
Loan
Property
Dec. 31, 2019
USD ($)
Loan
Troubled Debt Restructurings [Abstract]          
Number of Contracts 0 0   0  
Number of TDR loans in the portfolio 5   5   5
TDR loans in the portfolio | $ $ 8.4   $ 8.4   $ 2.5
Number of TDR loans current and performing 5   5   5
Percentage of deferments payment ended     94.00%    
Deferments payment granted | $     $ 5.5    
Number of TDRs with defaults occurring within 12 months of modification 0 0 0 0  
Less Than 30 Days Past Due [Member]          
Troubled Debt Restructurings [Abstract]          
Number of TDR loans in the portfolio 194   194    
TDR loans in the portfolio | $ $ 92.8   $ 92.8    
Residential Real Estate [Member]          
Troubled Debt Restructurings [Abstract]          
Number of foreclosed properties in possession or in process of foreclosure | Property 0 0 0 0  
Commercial Real Estate [Member]          
Troubled Debt Restructurings [Abstract]          
Number of Contracts     1    
Small Business Administration (SBA) CARES Act, Paycheck Protection Program [Member]          
Financing Receivable Impaired [Line Items]          
Financing receivable number of loans authorized 549   549    
Financing receivable amount of loans authorized | $ $ 53.1   $ 53.1    
Payment Deferral Program [Member]          
Troubled Debt Restructurings [Abstract]          
Number of deferments loans 7   7    
Payment Deferral Program [Member] | Residential Real Estate [Member]          
Troubled Debt Restructurings [Abstract]          
Number of deferments loans 3   3    
Payment Deferral Program [Member] | Commercial Real Estate [Member]          
Troubled Debt Restructurings [Abstract]          
Number of deferments loans 1   1    
Payment Deferral Program [Member] | Commercial and Industrial [Member]          
Troubled Debt Restructurings [Abstract]          
Number of deferments loans 2   2    
Payment Deferral Program [Member] | Construction and Land Loan [Member]          
Troubled Debt Restructurings [Abstract]          
Number of deferments loans 1   1