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Loans (Analysis of the age of the loan delinquencies by type and by amount past due) (Details 2) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 3,232,000 $ 1,071,000  
Current 275,252,000 282,268,000  
Loans 278,484,000 283,339,000 $ 280,572,000
30-59 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 412,000 622,000  
60-89 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2,472,000 349,000  
90 Days and Over      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 348,000 100,000  
Real estate loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 3,157,000 1,026,000  
Current 267,984,000 274,973,000  
Loans 271,141,000 275,999,000  
Real estate loans | 30-59 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 382,000 622,000  
Real estate loans | 60-89 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 2,472,000 349,000  
Real estate loans | 90 Days and Over      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 303,000 55,000  
Real estate loans | Construction      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Current 5,706,000 4,898,000  
Loans 5,706,000 4,898,000 6,277,000
Real estate loans | Construction | 30-59 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Real estate loans | Construction | 60-89 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Real estate loans | Construction | 90 Days and Over      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Real estate loans | Commercial real estate      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,901,000 248,000  
Current 20,060,000 22,244,000  
Loans 21,961,000 22,492,000 21,650,000
Real estate loans | Commercial real estate | 30-59 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 248,000  
Real estate loans | Commercial real estate | 60-89 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,653,000 0  
Real estate loans | Commercial real estate | 90 Days and Over      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 248,000 0  
Real estate loans | Home equity lines of credit      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 50,000 147,000  
Current 17,051,000 16,619,000  
Loans 17,101,000 16,766,000 17,012,000
Real estate loans | Home equity lines of credit | 30-59 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 50,000 147,000  
Real estate loans | Home equity lines of credit | 60-89 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Real estate loans | Home equity lines of credit | 90 Days and Over      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Real estate loans | Secured by multi-family residences      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Current 10,973,000 10,241,000  
Loans 10,973,000 10,241,000 10,337,000
Real estate loans | Secured by multi-family residences | 30-59 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Real estate loans | Secured by multi-family residences | 60-89 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Real estate loans | Secured by multi-family residences | 90 Days and Over      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Real estate loans | Secured by one-to-four family residences      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,206,000 631,000  
Current 214,194,000 220,971,000  
Loans 215,400,000 221,602,000 219,841,000
Real estate loans | Secured by one-to-four family residences | 30-59 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 332,000 227,000  
Real estate loans | Secured by one-to-four family residences | 60-89 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 819,000 349,000  
Real estate loans | Secured by one-to-four family residences | 90 Days and Over      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 55,000 55,000  
Other Loan Portfolio Segment | Commercial and industrial loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 75,000 45,000  
Current 7,221,000 7,245,000  
Loans 7,296,000 7,290,000 5,399,000
Other Loan Portfolio Segment | Commercial and industrial loans | 30-59 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 30,000 0  
Other Loan Portfolio Segment | Commercial and industrial loans | 60-89 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Other Loan Portfolio Segment | Commercial and industrial loans | 90 Days and Over      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 45,000 45,000  
Other Loan Portfolio Segment | Other loans      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Current 47,000 50,000  
Loans 47,000 50,000 $ 56,000
Other Loan Portfolio Segment | Other loans | 30-59 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Other Loan Portfolio Segment | Other loans | 60-89 Days Past Due And Accruing      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0 0  
Other Loan Portfolio Segment | Other loans | 90 Days and Over      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 0 $ 0