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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
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Allowance for loan losses:    
Balance, beginning of year $ 6,599 $ 6,234
Provision charged to expense 492 844
Losses charged off (67) (513)
Recoveries 28 34
Balance, end of period 7,052 6,599
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 7,052 6,599
Loans:    
Ending balance 525,736 520,526
Ending balance: individually evaluated for impairment 1,385 1,298
Ending balance: collectively evaluated for impairment 524,351 519,228
One- to four-family [Member]    
Allowance for loan losses:    
Balance, beginning of year 967 1,044
Provision charged to expense 100 (64)
Losses charged off (40) (15)
Recoveries 1 2
Balance, end of period 1,028 967
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 1,028 967
Loans:    
Ending balance 132,474 117,435
Ending balance: individually evaluated for impairment 1,350 1,252
Ending balance: collectively evaluated for impairment 131,124 116,183
Multi-family [Member]    
Allowance for loan losses:    
Balance, beginning of year 1,674 1,514
Provision charged to expense (299) 160
Losses charged off 0 0
Recoveries 0 0
Balance, end of period 1,375 1,674
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 1,375 1,674
Loans:    
Ending balance 88,247 104,433
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 88,247 104,433
Home equity lines of credit [Member]    
Allowance for loan losses:    
Balance, beginning of year 67 87
Provision charged to expense 3 (20)
Losses charged off 0 0
Recoveries 0 0
Balance, end of period 70 67
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 70 67
Loans:    
Ending balance 6,987 6,688
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 6,987 6,688
Construction [Member]    
Allowance for loan losses:    
Balance, beginning of year 258 240
Provision charged to expense 231 18
Losses charged off 0 0
Recoveries 0 0
Balance, end of period 489 258
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 489 258
Loans:    
Ending balance 41,254 25,345
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 41,254 25,345
Commercial [Member]    
Allowance for loan losses:    
Balance, beginning of year 1,831 1,706
Provision charged to expense 154 125
Losses charged off 0 0
Recoveries 0 0
Balance, end of period 1,985 1,831
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 1,985 1,831
Loans:    
Ending balance 167,375 155,884
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 167,375 155,884
Commercial [Member]    
Allowance for loan losses:    
Balance, beginning of year 1,740 1,583
Provision charged to expense 265 611
Losses charged off 0 (473)
Recoveries 20 19
Balance, end of period 2,025 1,740
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 2,025 1,740
Loans:    
Ending balance 80,418 103,088
Ending balance: individually evaluated for impairment 35 46
Ending balance: collectively evaluated for impairment 80,383 103,042
Consumer [Member]    
Allowance for loan losses:    
Balance, beginning of year 62 60
Provision charged to expense 38 14
Losses charged off (27) (25)
Recoveries 7 13
Balance, end of period 80 62
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment 80 62
Loans:    
Ending balance 8,981 7,653
Ending balance: individually evaluated for impairment 0 0
Ending balance: collectively evaluated for impairment $ 8,981 $ 7,653