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Loans Receivable and Related Allowance for Loan Losses - Additional Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
item
loan
security
Jun. 30, 2020
USD ($)
item
loan
security
Dec. 31, 2019
USD ($)
loan
Financing Receivable, Recorded Investment [Line Items]      
Deferred loan costs of loans receivable $ 1,600,000 $ 1,600,000 $ 233,000
Maximum deferment of payment term   90 days  
Possible impairment of past due troubled debt restructuring 200,000 $ 200,000  
Average investment in impaired loans 3,258,000 $ 2,652,000  
Past due period for troubled debt restructuring   90 days  
Threshold limit of watch list loans for external loan review   $ 100,000  
Number of loans on non-accrual status | loan   31 0
Non-accrual status less than 90 days past due 1,300,000 $ 1,300,000  
Real Estate Acquired Through Foreclosure $ 586,000 586,000 $ 404,000
Emergency economic relief   $ 2,000,000,000,000.0  
Residential property      
Financing Receivable, Recorded Investment [Line Items]      
Number of Real Estate Properties | item 5 5  
Commercial Real Estate and Construction      
Financing Receivable, Recorded Investment [Line Items]      
Number of Real Estate Properties | item 1 1  
Minimum      
Financing Receivable, Recorded Investment [Line Items]      
Number of semi annual review loan relationship | security 50 50  
Amount of new loan originations limit selected for external loan review   $ 200,000  
Maximum      
Financing Receivable, Recorded Investment [Line Items]      
Number of semi annual review loan relationship | security 60 60  
Amount of new loan originations limit selected for external loan review   $ 500,000  
Residential Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Percentage of loan portfolio   33.00%  
Non Residential Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Percentage of loan portfolio   22.90%  
Hotel And Motel Loans [Member      
Financing Receivable, Recorded Investment [Line Items]      
Loan outstanding $ 15,500,000 $ 15,500,000  
Amount of PPP loans outstanding 153,000 153,000  
Restaurant Loans [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loan outstanding 7,300,000 7,300,000  
Amount of PPP loans outstanding 2,800,000 2,800,000  
Construction Loan [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Construction portfolio $ 5,800,000 $ 5,800,000  
PPP      
Financing Receivable, Recorded Investment [Line Items]      
Number of applications received | loan 399 399  
Value of loan application processed $ 41,800,000 $ 41,800,000  
Guarantee of loan (as a percent)   100.00%  
Percentage of loan used for payroll 60.00% 60.00%  
Percentage of loan used for other qualified purpose 40.00% 40.00%  
Paycheck Protection Program ("PPP") Loan interest rate   1.00%  
Paycheck Protection Program ("PPP") Loan term   5 years  
Paycheck Protection Program ("PPP") Loan interest payment deferred period   6 months  
Paycheck Protection Program ("PPP") Loan Amount $ 10,000,000.0 $ 10,000,000.0  
Loan application fees received 1,600,000 $ 1,600,000  
Real Estate Loans | One-to-four-family Residential and Construction      
Financing Receivable, Recorded Investment [Line Items]      
Loan receivable maturity   30 years  
Real Estate Loans | Home Equity Loans and Lines of Credit      
Financing Receivable, Recorded Investment [Line Items]      
Loan receivable maturity   20 years  
Commercial Business      
Financing Receivable, Recorded Investment [Line Items]      
Average investment in impaired loans $ 607,000 $ 607,000