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Loans and Allowance for Loan Losses (Additional Information) (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and Leases Receivable, Related Parties, Description At December 31, 2018 and 2017, outstanding loans to certain officers, directors and their associated companies was less than 5% of the Company's shareholders' equity. December 31, 2018 and 2017, 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 $ 600,000 $ 843,000 $ 888,000  
Financing Receivable, Modifications, Number of Contracts 3 5 6  
Allowance Related to Troubled Debt Restructurings assigned during period $ 95,000 $ 45,000 $ 1,400,000  
Loans and Leases Receivable, Impaired, Commitment to Lend 0      
Proceeds from Recoveries of Loans Previously Charged off 1,944,000 $ 497,000 486,000  
Financing Receivable, Modifications, Subsequent Default, Number of Contracts   0    
Financing Receivable, Modifications, Subsequent Default, Recorded Investment     0  
Financing Receivable, Individually Evaluated for Impairment 6,926,000 $ 13,590,000 20,254,000  
Financing receivable, allowance for credit losses 24,712,000 24,171,000 23,116,000 $ 21,166,000
HPFC Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Individually Evaluated for Impairment     97,000  
Financing receivable, allowance for credit losses 337,000 451,000 672,000 24,000
Residential real estate loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Individually Evaluated for Impairment 4,762,000 5,171,000 4,348,000  
Financing receivable, allowance for credit losses 6,071,000 5,086,000 4,160,000 4,545,000
Financing Receivable in Process of Foreclosure 2,300,000 1,900,000    
Loans Receivable [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans restructured due to credit difficulties that are now performing 3,900,000 5,000,000    
Financing Receivables Impaired Troubled Debt Restructuring Non-Performing 500,000 1,200,000    
Consumer loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Individually Evaluated for Impairment 6,000   7,000  
Financing receivable, allowance for credit losses 234,000 $ 233,000 181,000 $ 193,000
Minimum [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Individually Evaluated for Impairment $ 500,000      
Number of Months 18      
Minimum [Member] | HPFC Portfolio Segment [Member]        
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 [Member]        
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 11.00%      
Commercial real estate loans | Loan Concentration Risk [Member] | Non-Residential Building Operators Industry Sector [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Concentration Risk, Percentage 26.00%      
Commercial loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Loans 1      
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0   $ 280,000  
Commercial loans | Extended Maturity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, Modifications, Number of Contracts 0 0 6  
Allowance Related to Troubled Debt Restructurings assigned during period $ 0 $ 0 $ 1,400,000  
Proceeds from Recoveries of Loans Previously Charged off 1,400,000      
Home Equity Loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Allowance Related to Troubled Debt Restructurings assigned during period $ 162,000      
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 1      
Financing Receivable, Modifications, Subsequent Default, Recorded Investment $ 299,000