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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, 2025
Sep. 30, 2024
Jun. 30, 2025
Allowance for loan losses:      
Balance, beginning of period $ 6,627 $ 7,499 $ 7,499
Provision (credit) charged to expense (65) 377 (678)
Losses charged off (79) (409) (549)
Recoveries 8 5 355
Balance, end of period 6,491 7,472 6,627
Loans:      
Ending balance 625,438 654,189 639,886
One- to Four-Family [Member]      
Allowance for loan losses:      
Balance, beginning of period 1,475 1,774 1,774
Provision (credit) charged to expense 75 (147) (222)
Losses charged off 0 0 (79)
Recoveries 2 1 2
Balance, end of period 1,552 1,628 1,475
Loans:      
Ending balance 181,617 176,334 178,979
Multi-Family [Member]      
Allowance for loan losses:      
Balance, beginning of period 1,513 1,764 1,764
Provision (credit) charged to expense (153) 348 (121)
Losses charged off 0 (350) (350)
Recoveries 0 0 220
Balance, end of period 1,360 1,762 1,513
Loans:      
Ending balance 118,318 125,906 126,127
Home Equity Line of Credit [Member]      
Allowance for loan losses:      
Balance, beginning of period 144 148 148
Provision (credit) charged to expense (8) (1) (4)
Losses charged off 0 0 0
Recoveries 0 0 0
Balance, end of period 136 147 144
Loans:      
Ending balance 10,359 9,927 10,487
Construction [Member]      
Allowance for loan losses:      
Balance, beginning of period 206 337 337
Provision (credit) charged to expense (26) (59) (131)
Losses charged off 0 0 0
Recoveries 0 0 0
Balance, end of period 180 278 206
Loans:      
Ending balance 20,015 30,839 22,927
Commercial [Member]      
Allowance for loan losses:      
Balance, beginning of period 2,252 2,358 2,358
Provision (credit) charged to expense (135) 4 (106)
Losses charged off 0 0 0
Recoveries 0 0 0
Balance, end of period 2,117 2,362 2,252
Loans:      
Ending balance 196,022 205,103 201,550
Commercial [Member]      
Allowance for loan losses:      
Balance, beginning of period 985 1,053 1,053
Provision (credit) charged to expense 174 231 (131)
Losses charged off (70) (50) (50)
Recoveries 2 2 113
Balance, end of period 1,091 1,236 985
Loans:      
Ending balance 93,243 98,894 93,961
Consumer [Member]      
Allowance for loan losses:      
Balance, beginning of period 52 65 65
Provision (credit) charged to expense 8 1 37
Losses charged off (9) (9) (70)
Recoveries 4 2 20
Balance, end of period 55 59 52
Loans:      
Ending balance $ 5,864 $ 7,186 $ 5,855