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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Allowance for loan losses:      
Balance, beginning of year $ 7,139 $ 7,052 $ 7,052
Impact of adopting ASU 2016-13   47 47
Provision charged to expense 310 (67) 52
Losses charged off (7) (16) (51)
Recoveries 8 7 39
Balance, end of period 7,450 7,023 7,139
Loans:      
Ending balance 621,771 550,905 594,324
One- to four-family [Member]      
Allowance for loan losses:      
Balance, beginning of year 1,898 1,028 1,028
Impact of adopting ASU 2016-13   382 382
Provision charged to expense 8 126 487
Losses charged off 0 0 0
Recoveries 0 1 1
Balance, end of period 1,906 1,537 1,898
Loans:      
Ending balance 170,154 142,417 163,854
Multi-family [Member]      
Allowance for loan losses:      
Balance, beginning of year 1,121 1,375 1,375
Impact of adopting ASU 2016-13   (140) (140)
Provision charged to expense (6) 49 (114)
Losses charged off 0 0 0
Recoveries 0 0 0
Balance, end of period 1,115 1,284 1,121
Loans:      
Ending balance 89,177 98,778 89,649
Home equity lines of credit [Member]      
Allowance for loan losses:      
Balance, beginning of year 121 70 70
Impact of adopting ASU 2016-13   33 33
Provision charged to expense 13 (9) 18
Losses charged off 0 0 0
Recoveries 0 0 0
Balance, end of period 134 94 121
Loans:      
Ending balance 8,511 6,778 8,066
Construction [Member]      
Allowance for loan losses:      
Balance, beginning of year 765 489 489
Impact of adopting ASU 2016-13   192 192
Provision charged to expense 400 (132) 84
Losses charged off 0 0 0
Recoveries 0 0 0
Balance, end of period 1,165 549 765
Loans:      
Ending balance 72,810 34,314 50,973
Commercial [Member]      
Allowance for loan losses:      
Balance, beginning of year 2,369 1,985 1,985
Impact of adopting ASU 2016-13   385 385
Provision charged to expense (104) 16 (1)
Losses charged off 0 0 0
Recoveries 0 0 0
Balance, end of period 2,265 2,386 2,369
Loans:      
Ending balance 193,582 181,934 193,707
Commercial [Member]      
Allowance for loan losses:      
Balance, beginning of year 794 2,025 2,025
Impact of adopting ASU 2016-13   (818) (818)
Provision charged to expense (12) (117) (422)
Losses charged off 0 (4) (14)
Recoveries 6 4 23
Balance, end of period 788 1,090 794
Loans:      
Ending balance 79,194 77,103 79,693
Consumer [Member]      
Allowance for loan losses:      
Balance, beginning of year 71 80 80
Impact of adopting ASU 2016-13   13 13
Provision charged to expense 11 0 0
Losses charged off (7) (12) (37)
Recoveries 2 2 15
Balance, end of period 77 83 71
Loans:      
Ending balance $ 8,343 $ 9,581 $ 8,382