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Loans (Detail Textuals)
 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
loan
Sep. 30, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 278,484,000 $ 283,339,000 $ 280,572,000
Loans serviced for others 115,700,000 123,800,000  
Total Past Due $ 3,232,000 $ 1,071,000  
Residential mortgage loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of nonaccrual loans | loan 1 2  
Financing receivable, recorded Investment, nonaccrual status $ 55,000 $ 55,000  
Carrying value of loans pledged as collateral $ 196,200,000 201,900,000  
Number of loans newly categorized | loan 2    
Other Assets      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Fair value of mortgage servicing rights $ 722,000 812,000  
Real estate loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 271,141,000 $ 275,999,000  
Financing Receivable, Modifications, Number of Contracts | loan   1  
Mortgage Loans on Real Estate, Foreclosures 55,000 $ 55,000  
Total Past Due 3,157,000 1,026,000  
Real estate loans | Home equity lines of credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 17,101,000 16,766,000 17,012,000
Total Past Due 50,000 147,000  
Real estate loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 5,706,000 4,898,000 6,277,000
Total Past Due 0 0  
Real estate loans | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 21,961,000 22,492,000 21,650,000
Financing Receivable, Modifications, Number of Contracts | loan 1    
Mortgage Loans on Real Estate, Foreclosures $ 248,000    
Total Past Due 1,901,000 248,000  
Real estate loans | Secured by one-to-four family residences      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 215,400,000 221,602,000 219,841,000
Total Past Due 1,206,000 631,000  
Real estate loans | Secured by multi-family residences      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 10,973,000 10,241,000 10,337,000
Total Past Due 0 0  
Other Loan Portfolio Segment | Commercial and industrial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 7,296,000 7,290,000 5,399,000
Total Past Due 75,000 45,000  
Other Loan Portfolio Segment | Other loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 47,000 50,000 $ 56,000
Total Past Due 0 0  
Substandard      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 4,200,000 3,380,000  
Substandard | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amount of loan increased $ 955,000    
Percentage of loan Increased 385.10%    
Substandard | Real estate loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 4,155,000 3,335,000  
Substandard | Real estate loans | Home equity lines of credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 170,000 201,000  
Substandard | Real estate loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 0 0  
Substandard | Real estate loans | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 1,203,000 248,000  
Number of loans newly categorized | loan 1    
Substandard | Real estate loans | Secured by one-to-four family residences      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 2,782,000 2,886,000  
Amount of loan decreased $ 234,000    
Percentage of loan decreased 25.10%    
Substandard | Real estate loans | Secured by multi-family residences      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 0 0  
Substandard | Other Loan Portfolio Segment | Commercial and industrial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 45,000 45,000  
Substandard | Other Loan Portfolio Segment | Other loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 0 0  
Special Mention      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 911,000 1,425,000  
Special Mention | Residential mortgage loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of loans newly categorized | loan 2    
Special Mention | Commercial and industrial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amount of loan increased $ 30,000    
Special Mention | Real estate loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 881,000 1,425,000  
Special Mention | Real estate loans | Home equity lines of credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 0 0  
Special Mention | Real estate loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 0 0  
Special Mention | Real estate loans | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 697,000 931,000  
Number of loans newly categorized | loan 1    
Special Mention | Real estate loans | Secured by one-to-four family residences      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 184,000 494,000  
Amount of loan decreased $ 310,000    
Percentage of loan decreased 62.80%    
Special Mention | Real estate loans | Secured by multi-family residences      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans $ 0 0  
Special Mention | Other Loan Portfolio Segment | Commercial and industrial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 30,000 0  
Special Mention | Other Loan Portfolio Segment | Other loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans 0 0  
30-59 Days Past Due And Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 412,000 622,000  
30-59 Days Past Due And Accruing | Residential mortgage loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Additional number of loans | loan 3    
Number of Loans partially payoffs offset | loan 2    
30-59 Days Past Due And Accruing | Real estate loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 382,000 622,000  
30-59 Days Past Due And Accruing | Real estate loans | Home equity lines of credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amount of loan decreased $ 97,000    
Percentage of loan decreased 66.00%    
Total Past Due $ 50,000 147,000  
30-59 Days Past Due And Accruing | Real estate loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 0 0  
30-59 Days Past Due And Accruing | Real estate loans | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 0 248,000  
30-59 Days Past Due And Accruing | Real estate loans | Secured by one-to-four family residences      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amount of loan increased $ 105,000    
Percentage of loan Increased 46.30%    
Total Past Due $ 332,000 227,000  
30-59 Days Past Due And Accruing | Real estate loans | Secured by multi-family residences      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 0 0  
30-59 Days Past Due And Accruing | Other Loan Portfolio Segment | Commercial and industrial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amount of loan increased 30,000    
Total Past Due 30,000 0  
30-59 Days Past Due And Accruing | Other Loan Portfolio Segment | Other loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 0 0  
60-89 Days Past Due And Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 2,472,000 349,000  
60-89 Days Past Due And Accruing | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Additional number of loans | loan 2    
60-89 Days Past Due And Accruing | Real estate loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 2,472,000 349,000  
60-89 Days Past Due And Accruing | Real estate loans | Home equity lines of credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 0 0  
60-89 Days Past Due And Accruing | Real estate loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 0 0  
60-89 Days Past Due And Accruing | Real estate loans | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amount of loan increased 1,700,000    
Total Past Due 1,653,000 0  
60-89 Days Past Due And Accruing | Real estate loans | Secured by one-to-four family residences      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amount of loan increased $ 470,000    
Percentage of loan Increased 134.70%    
Total Past Due $ 819,000 349,000  
60-89 Days Past Due And Accruing | Real estate loans | Secured by multi-family residences      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 0 0  
60-89 Days Past Due And Accruing | Other Loan Portfolio Segment | Residential mortgage loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Additional number of loans | loan 2    
Number of Loans partially payoffs offset | loan 2    
60-89 Days Past Due And Accruing | Other Loan Portfolio Segment | Commercial and industrial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 0 0  
60-89 Days Past Due And Accruing | Other Loan Portfolio Segment | Other loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 0 0  
90 Days and Over      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 348,000 100,000  
90 Days and Over | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Additional number of loans | loan 1    
90 Days and Over | Real estate loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 303,000 55,000  
90 Days and Over | Real estate loans | Home equity lines of credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 0 0  
90 Days and Over | Real estate loans | Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 0 0  
90 Days and Over | Real estate loans | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Amount of loan increased 248,000    
Total Past Due 248,000 0  
90 Days and Over | Real estate loans | Secured by one-to-four family residences      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 55,000 55,000  
90 Days and Over | Real estate loans | Secured by multi-family residences      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 0 0  
90 Days and Over | Other Loan Portfolio Segment | Commercial and industrial loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due 45,000 45,000  
90 Days and Over | Other Loan Portfolio Segment | Other loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total Past Due $ 0 $ 0