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Loans and Allowance for Loan Losses (Additional Information) (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and Leases Receivable, Related Parties, Description At December 31, 2019 and 2018, outstanding loans to certain officers, directors and their associated companies was less than 5% of the Company's shareholders' equity. December 31, 2019 and 2018, outstanding loans to certain officers, directors and their associated companies was less than 5% of the Company's shareholders' equity.  
Number of Portfolio Concentration Industries 0    
Foregone interest $ 420,000 $ 600,000 $ 843,000
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0    
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan 0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     0
Allowance Related to Troubled Debt Restructurings assigned during period $ 15,000 95,000 $ 45,000
Residential real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable in Process of Foreclosure 1,300,000 2,300,000  
Loans Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Performing TDRs 3,000,000 3,900,000  
Non-Performing TDRs $ 600,000 $ 500,000  
Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Months 18    
Minimum [Member] | HPFC Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term to maturity (years) 7 years    
Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Months 24    
Maximum [Member] | HPFC Portfolio Segment      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Term to maturity (years) 10 years    
Total Loan Portfolio [Member] | Loan Concentration Risk [Member] | Non-Residential Building Operators Industry Sector [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration Risk, Percentage 12.00%    
Commercial real estate | Loan Concentration Risk [Member] | Non-Residential Building Operators Industry Sector [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Concentration Risk, Percentage 31.00%    
Home Equity Loan      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   1  
Financing Receivable, Modifications, Subsequent Default, Recorded Investment   $ 299,000  
Allowance Related to Troubled Debt Restructurings assigned during period   $ 162,000