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Loans and Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans Based on Portfolio Segment and Impairment Method (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Allowance for loan losses:          
Balance, beginning of year $ 6,277 $ 6,181 $ 6,328 $ 5,945 $ 5,945
Provision charged to expense (30) 138 (84) 375 407
Losses charged off (26) (3) (41) (5) (50)
Recoveries 1 3 19 4 26
Balance, end of period 6,222 6,319 6,222 6,319 6,328
Ending balance: individually evaluated for impairment   23   23 23
Ending balance: collectively evaluated for impairment 6,222 6,296 6,222 6,296 6,305
Loans:          
Ending balance 496,397 500,301 496,397 500,301 493,753
Ending balance: individually evaluated for impairment 1,550 2,743 1,550 2,743 1,851
Ending balance: collectively evaluated for impairment 494,847 497,558 494,847 497,558 491,902
One- to four-family [Member]          
Allowance for loan losses:          
Balance, beginning of year 990 1,012 1,031 997 997
Provision charged to expense 14 11 (30) 25 29
Losses charged off (13)   (13)   (17)
Recoveries     3 1 22
Balance, end of period 991 1,023 991 1,023 1,031
Ending balance: individually evaluated for impairment         13
Ending balance: collectively evaluated for impairment 991 1,023 991 1,023 1,018
Loans:          
Ending balance 127,679 130,800 127,679 130,800 129,290
Ending balance: individually evaluated for impairment 1,470 1,458 1,470 1,458 1,722
Ending balance: collectively evaluated for impairment 126,209 129,342 126,209 129,342 127,568
Multi-family [Member]          
Allowance for loan losses:          
Balance, beginning of year 1,602 1,656 1,642 1,650 1,650
Provision charged to expense (40) 12 (80) 18 (8)
Balance, end of period 1,562 1,668 1,562 1,668 1,642
Ending balance: collectively evaluated for impairment 1,562 1,668 1,562 1,668 1,642
Loans:          
Ending balance 102,756 108,391 102,756 108,391 104,663
Ending balance: individually evaluated for impairment   1,200   1,200  
Ending balance: collectively evaluated for impairment 102,756 107,191 102,756 107,191 104,663
Home equity lines of credit [Member]          
Allowance for loan losses:          
Balance, beginning of year 90 91 89 91 91
Provision charged to expense   12 1 12 13
Losses charged off         (15)
Balance, end of period 90 103 90 103 89
Ending balance: individually evaluated for impairment   15   15  
Ending balance: collectively evaluated for impairment 90 88 90 88 89
Loans:          
Ending balance 8,867 8,913 8,867 8,913 8,938
Ending balance: individually evaluated for impairment 18 38 18 38 22
Ending balance: collectively evaluated for impairment 8,849 8,875 8,849 8,875 8,916
Construction [Member]          
Allowance for loan losses:          
Balance, beginning of year 204 169 213 168 168
Provision charged to expense 13 1 4 2 45
Balance, end of period 217 170 217 170 213
Ending balance: collectively evaluated for impairment 217 170 217 170 213
Loans:          
Ending balance 18,749 12,447 18,749 12,447 16,113
Ending balance: individually evaluated for impairment 0 0 0 0  
Ending balance: collectively evaluated for impairment 18,749 12,447 18,749 12,447 16,113
Commercial [Member]          
Allowance for loan losses:          
Balance, beginning of year 1,657 1,644 1,623 1,604 1,604
Provision charged to expense 28 160 62 200 19
Balance, end of period 1,685 1,804 1,685 1,804 1,623
Ending balance: individually evaluated for impairment   2   2  
Ending balance: collectively evaluated for impairment 1,685 1,802 1,685 1,802 1,623
Loans:          
Ending balance 148,299 158,226 148,299 158,226 143,367
Ending balance: individually evaluated for impairment 6 38 6 38 18
Ending balance: collectively evaluated for impairment 148,293 158,188 148,293 158,188 143,349
Commercial [Member]          
Allowance for loan losses:          
Balance, beginning of year 1,664 1,547 1,659 1,373 1,373
Provision charged to expense (54) (66) (63) 108 286
Recoveries     14    
Balance, end of period 1,610 1,481 1,610 1,481 1,659
Ending balance: individually evaluated for impairment   6   6  
Ending balance: collectively evaluated for impairment 1,610 1,475 1,610 1,475 1,659
Loans:          
Ending balance 82,692 74,231 82,692 74,231 84,246
Ending balance: individually evaluated for impairment 48 6 48 6 60
Ending balance: collectively evaluated for impairment 82,644 74,225 82,644 74,225 84,186
Consumer [Member]          
Allowance for loan losses:          
Balance, beginning of year 70 62 71 62 62
Provision charged to expense 9 8 22 10 23
Losses charged off (13) (3) (28) (5) (18)
Recoveries 1 3 2 3 4
Balance, end of period 67 70 67 70 71
Ending balance: individually evaluated for impairment         10
Ending balance: collectively evaluated for impairment 67 70 67 70 61
Loans:          
Ending balance 7,355 7,293 7,355 7,293 7,136
Ending balance: individually evaluated for impairment 8 3 8 3 29
Ending balance: collectively evaluated for impairment $ 7,347 $ 7,290 $ 7,347 $ 7,290 $ 7,107