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Loans and Allowance for Credit Losses - Allowance for Credit 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, 2022 | Sep. 30, 2021 | Jun. 30, 2022
Allowance for loan losses: |  |  |
Balance, beginning of year | $ 7,052 | $ 6,599 | $ 6,599
Impact of adopting ASU 2016-13 | 47 |  |
Provision charged to expense | (67) | (127) | 492
Losses charged off | (16) | (10) | (67)
Recoveries | 7 | 8 | 28
Balance, end of period | 7,023 | 6,470 | 7,052
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | 6,470 | 7,052
Loans: |  |  |
Ending balance | 550,905 | 512,984 | 525,736
Ending balance: individually evaluated for impairment |  | 1,129 | 1,385
Ending balance: collectively evaluated for impairment |  | 511,855 | 524,351
One- to four-family [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 1,028 | 967 | 967
Impact of adopting ASU 2016-13 | 382 |  |
Provision charged to expense | 126 | 6 | 100
Losses charged off | 0 | 0 | (40)
Recoveries | 1 | 1 | 1
Balance, end of period | 1,537 | 974 | 1,028
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | 974 | 1,028
Loans: |  |  |
Ending balance | 142,417 | 117,854 | 132,474
Ending balance: individually evaluated for impairment |  | 1,086 | 1,350
Ending balance: collectively evaluated for impairment |  | 116,768 | 131,124
Multi-family [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 1,375 | 1,674 | 1,674
Impact of adopting ASU 2016-13 | (140) |  |
Provision charged to expense | 49 | (112) | (299)
Losses charged off | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Balance, end of period | 1,284 | 1,562 | 1,375
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | 1,562 | 1,375
Loans: |  |  |
Ending balance | 98,778 | 97,211 | 88,247
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | 97,211 | 88,247
Home equity lines of credit [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 70 | 67 | 67
Impact of adopting ASU 2016-13 | 33 |  |
Provision charged to expense | (9) | (4) | 3
Losses charged off | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Balance, end of period | 94 | 63 | 70
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | 63 | 70
Loans: |  |  |
Ending balance | 6,778 | 6,274 | 6,987
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | 6,274 | 6,987
Construction [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 489 | 258 | 258
Impact of adopting ASU 2016-13 | 192 |  |
Provision charged to expense | (132) | 63 | 231
Losses charged off | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Balance, end of period | 549 | 321 | 489
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | 321 | 489
Loans: |  |  |
Ending balance | 34,314 | 31,209 | 41,254
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | 31,209 | 41,254
Commercial [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 1,985 | 1,831 | 1,831
Impact of adopting ASU 2016-13 | 385 |  |
Provision charged to expense | 16 | 85 | 154
Losses charged off | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Balance, end of period | 2,386 | 1,916 | 1,985
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | 1,916 | 1,985
Loans: |  |  |
Ending balance | 181,934 | 163,859 | 167,375
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | 163,859 | 167,375
Commercial [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 2,025 | 1,740 | 1,740
Impact of adopting ASU 2016-13 | (818) |  |
Provision charged to expense | (117) | (174) | 265
Losses charged off | (4) | 0 | 0
Recoveries | 4 | 5 | 20
Balance, end of period | 1,090 | 1,571 | 2,025
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | 1,571 | 2,025
Loans: |  |  |
Ending balance | 77,103 | 88,962 | 80,418
Ending balance: individually evaluated for impairment |  | 43 | 35
Ending balance: collectively evaluated for impairment |  | 88,919 | 80,383
Consumer [Member] |  |  |
Allowance for loan losses: |  |  |
Balance, beginning of year | 80 | 62 | 62
Impact of adopting ASU 2016-13 | 13 |  |
Provision charged to expense | 0 | 9 | 38
Losses charged off | (12) | (10) | (27)
Recoveries | 2 | 2 | 7
Balance, end of period | 83 | 63 | 80
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | 63 | 80
Loans: |  |  |
Ending balance | $ 9,581 | 7,615 | 8,981
Ending balance: individually evaluated for impairment |  | 0 | 0
Ending balance: collectively evaluated for impairment |  | $ 7,615 | $ 8,981

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI https://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI https://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI https://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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