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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 | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020
Allowance for loan losses: |  |  |
Balance, beginning of year | $ 6,234 | $ 6,328 | $ 6,328
Provision charged to expense | 315 | (54) | 128
Losses charged off | (57) | (15) | (268)
Recoveries | 14 | 18 | 46
Balance, end of period | 6,506 | 6,277 | 6,234
Ending balance: individually evaluated for impairment | 0 | 19 | 0
Ending balance: collectively evaluated for impairment | 6,506 | 6,258 | 6,234
Loans: |  |  |
Ending balance | 525,033 | 496,903 | 515,887
Ending balance: individually evaluated for impairment | 1,336 | 1,813 | 1,660
Ending balance: collectively evaluated for impairment | 523,697 | 495,090 | 514,227
One- to four-family [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 1,044 | 1,031 | 1,031
Provision charged to expense | 4 | (44) | 50
Losses charged off | (15) | 0 | (40)
Recoveries | 0 | 3 | 3
Balance, end of period | 1,033 | 990 | 1,044
Ending balance: individually evaluated for impairment | 0 | 13 | 0
Ending balance: collectively evaluated for impairment | 1,033 | 977 | 1,044
Loans: |  |  |
Ending balance | 125,574 | 126,152 | 128,876
Ending balance: individually evaluated for impairment | 1,277 | 1,702 | 1,336
Ending balance: collectively evaluated for impairment | 124,297 | 124,450 | 127,540
Multi-family [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 1,514 | 1,642 | 1,642
Provision charged to expense | 227 | (40) | (128)
Losses charged off | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Balance, end of period | 1,741 | 1,602 | 1,514
Ending balance: individually evaluated for impairment | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 1,741 | 1,602 | 1,514
Loans: |  |  |
Ending balance | 106,886 | 105,548 | 96,195
Ending balance: individually evaluated for impairment | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 106,886 | 105,548 | 96,195
Home equity lines of credit [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 87 | 89 | 89
Provision charged to expense | (5) | 1 | (2)
Losses charged off | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Balance, end of period | 82 | 90 | 87
Ending balance: individually evaluated for impairment | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 82 | 90 | 87
Loans: |  |  |
Ending balance | 8,147 | 8,897 | 8,551
Ending balance: individually evaluated for impairment | 0 | 19 | 15
Ending balance: collectively evaluated for impairment | 8,147 | 8,878 | 8,536
Construction [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 240 | 213 | 213
Provision charged to expense | (155) | (9) | 27
Losses charged off | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Balance, end of period | 85 | 204 | 240
Ending balance: individually evaluated for impairment | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 85 | 204 | 240
Loans: |  |  |
Ending balance | 10,050 | 17,267 | 22,042
Ending balance: individually evaluated for impairment | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 10,050 | 17,267 | 22,042
Commercial [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 1,706 | 1,623 | 1,623
Provision charged to expense | 168 | 34 | 83
Losses charged off | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Balance, end of period | 1,874 | 1,657 | 1,706
Ending balance: individually evaluated for impairment | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 1,874 | 1,657 | 1,706
Loans: |  |  |
Ending balance | 157,096 | 146,500 | 145,113
Ending balance: individually evaluated for impairment | 0 | 16 | 0
Ending balance: collectively evaluated for impairment | 157,096 | 146,484 | 145,113
Commercial [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 1,583 | 1,659 | 1,659
Provision charged to expense | 61 | (9) | 84
Losses charged off | (29) | 0 | (191)
Recoveries | 9 | 14 | 31
Balance, end of period | 1,624 | 1,664 | 1,583
Ending balance: individually evaluated for impairment | 0 | 0 | 0
Ending balance: collectively evaluated for impairment | 1,624 | 1,664 | 1,583
Loans: |  |  |
Ending balance | 109,182 | 84,825 | 107,581
Ending balance: individually evaluated for impairment | 55 | 55 | 304
Ending balance: collectively evaluated for impairment | 109,127 | 84,770 | 107,277
Consumer [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 60 | 71 | 71
Provision charged to expense | 15 | 13 | 14
Losses charged off | (13) | (15) | (37)
Recoveries | 5 | 1 | 12
Balance, end of period | 67 | 70 | 60
Ending balance: individually evaluated for impairment | 0 | 6 | 0
Ending balance: collectively evaluated for impairment | 67 | 64 | 60
Loans: |  |  |
Ending balance | 8,098 | 7,714 | 7,529
Ending balance: individually evaluated for impairment | 4 | 21 | 5
Ending balance: collectively evaluated for impairment | $ 8,094 | $ 7,693 | $ 7,524

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