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Loans and Allowance for Loan Losses - Additional Information (Detail)
 6 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
SecurityLoan
Jun. 30, 2019
USD ($)
SecurityLoan
Dec. 31, 2019
TDRs
Dec. 31, 2019
Banking_Office
Loans and Allowance for Credit Losses [Line Items]        
Maximum amount of one-to-four family residential mortgage loans can be approved by loan officer $ 100,000      
Maximum amount of other secured loans real estate loans can be approved by loan officer 50,000      
Maximum amount of unsecured loans real estate loans can be approved by loan officer 10,000      
Maximum amount of one-to-four family residential mortgage loans can be approved by managing officer 375,000      
Maximum amount other secured loans residential mortgage loans can be approved by managing officer 375,000      
Maximum amount of unsecured loans residential mortgage loans can be approved by managing officer 100,000      
Maximum amount of unsecured loans real estate loans can be approved by loan committee 500,000      
Maximum aggregate loan amount of one-to four-family residential mortgage loans, commercial real estate loans, multi-family real estate loans and land loans can be approved by loan committee 2,000,000      
Troubled debt restructurings, Impaired loans 1,457,000 $ 1,505,000    
Foreclosed residential real estate properties 435,000 778,000    
Residential real estate properties foreclosure proceedings 33,000      
Fair Value, Concentration of Risk, Collateral Policy [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Commercial and multi-family real estate 264,384,000 $ 260,888,000    
Troubled Debt Restructurings [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Troubled debt restructurings, Impaired loans 1,500,000      
Number of default loans | SecurityLoan   6    
Minimum period for default   90 days    
Residential Real Estate [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Foreclosed residential real estate properties $ 213,000      
Consumer [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Consumer loans term in years 7 years      
Unsecured loans are limited to period 0 months      
Investment recorded post modification   $ 2,000    
Consumer [Member] | Troubled Debt Restructurings [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Number of default loans | SecurityLoan   1    
Investment recorded post modification   $ 2,000    
Commercial [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Troubled debt restructurings, Impaired loans $ 2,000 6,000    
Investment recorded post modification default loans 4,000      
Commercial [Member] | Troubled Debt Restructurings [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Investment recorded post modification $ 0      
One- to four-family [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Maximum term of fixed-rate one- to four-family residential mortgage loans 15 years      
Troubled debt restructurings, Impaired loans $ 1,437,000 $ 1,475,000    
Number of default loans | SecurityLoan 2 3    
Number of troubled debt restructurings in accrual status     10 10
Amount of troubled debt restructurings in accrual status $ 1,300,000 $ 1,300,000    
Investment recorded prior to modification   159,000    
Investment recorded post modification   $ 8,000    
One- to four-family [Member] | Troubled Debt Restructurings [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Number of loans | SecurityLoan 3 4    
Investment recorded post modification $ 134,000 $ 144,000    
Purchased Loans and Loan Participations [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Approximate amount of purchase loans included in loans receivable 4,293,000 4,844,000    
Approximate amount of loans included on out-of-area participation 26,626,000 29,524,000    
Amount within 100 miles of primary area $ 9,341,000 $ 12,025,000    
Troubled Debt Restructurings [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Number of default loans | SecurityLoan 3      
Foreclosure [Member] | Troubled Debt Restructurings [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Number of default loans | SecurityLoan 0 0    
Home equity lines of credit [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Troubled debt restructurings, Impaired loans $ 18,000 $ 22,000    
Number of default loans | SecurityLoan   1    
Number of troubled debt restructurings in accrual status     1 1
Amount of troubled debt restructurings in accrual status $ 1,000 $ 1,000    
Investment recorded post modification   $ 20,000    
Home equity lines of credit [Member] | Troubled Debt Restructurings [Member]        
Loans and Allowance for Credit Losses [Line Items]        
Number of default loans | SecurityLoan   1    
Investment recorded post modification   $ 20,000