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Loans Receivable and Allowance for Loan Losses: Schedule of Allowance for Loan Losses (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | $ 17,478,000 | $ 15,817,000 | $ 13,703,000
Provision for credit losses - loans | 853,000 | 1,254,000 | 2,132,000
Charge-offs | (247,000) | (101,000) | (19,000)
Recoveries | 7,000 | 47,000 | 1,000
Allowance for loan losses, Ending Allowance | 18,091,000 | 17,478,000 | 15,817,000
Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | 461,000 |
Allowance for loan losses, Ending Allowance |  |  | 461,000
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 2,632,000 | 2,417,000 | 1,658,000
Provision for credit losses - loans | 260,000 | 580,000 | 759,000
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 43,000 | 0
Allowance for loan losses, Ending Allowance | 2,892,000 | 2,632,000 | 2,417,000
Mortgage loans, one-to-four family | Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | (408,000) |
Allowance for loan losses, Ending Allowance |  |  | (408,000)
Mortgage loans, multi-family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 1,308,000 | 1,156,000 | 855,000
Provision for credit losses - loans | 317,000 | 272,000 | 301,000
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 1,625,000 | 1,308,000 | 1,156,000
Mortgage loans, multi-family | Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | (120,000) |
Allowance for loan losses, Ending Allowance |  |  | (120,000)
Mortgage loans, commercial |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 6,934,000 | 7,209,000 | 6,682,000
Provision for credit losses - loans | 213,000 | 219,000 | 527,000
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 7,147,000 | 6,934,000 | 7,209,000
Mortgage loans, commercial | Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | (494,000) |
Allowance for loan losses, Ending Allowance |  |  | (494,000)
Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 1,328,000 | 750,000 | 675,000
Provision for credit losses - loans | (60,000) | 36,000 | 75,000
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 1,268,000 | 1,328,000 | 750,000
Mortgage loans, construction - custom and owner/builder | Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | 542,000 |
Allowance for loan losses, Ending Allowance |  |  | 542,000
Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 128,000 | 148,000 | 130,000
Provision for credit losses - loans | (16,000) | (4,000) | 18,000
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 112,000 | 128,000 | 148,000
Mortgage loans, construction - speculative one-to-four family | Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | (16,000) |
Allowance for loan losses, Ending Allowance |  |  | (16,000)
Mortgage loans, construction - commercial |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 537,000 | 316,000 | 343,000
Provision for credit losses - loans | (189,000) | 45,000 | (27,000)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 348,000 | 537,000 | 316,000
Mortgage loans, construction - commercial | Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | 176,000 |
Allowance for loan losses, Ending Allowance |  |  | 176,000
Mortgage loans, construction - multi-family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 456,000 | 602,000 | 447,000
Provision for credit losses - loans | (56,000) | (350,000) | 155,000
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 400,000 | 456,000 | 602,000
Mortgage loans, construction - multi-family | Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | 204,000 |
Allowance for loan losses, Ending Allowance |  |  | 204,000
Mortgage loans - construction - land development |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 335,000 | 274,000 | 233,000
Provision for credit losses - loans | 77,000 | 36,000 | 41,000
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 412,000 | 335,000 | 274,000
Mortgage loans - construction - land development | Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | 25,000 |
Allowance for loan losses, Ending Allowance |  |  | 25,000
Mortgage loans, land |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 793,000 | 406,000 | 397,000
Provision for credit losses - loans | 4,000 | 69,000 | 9,000
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 797,000 | 793,000 | 406,000
Mortgage loans, land | Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | 318,000 |
Allowance for loan losses, Ending Allowance |  |  | 318,000
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 348,000 | 519,000 | 440,000
Provision for credit losses - loans | 87,000 | 72,000 | 79,000
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 435,000 | 348,000 | 519,000
Consumer loans, home equity and second mortgage | Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | (243,000) |
Allowance for loan losses, Ending Allowance |  |  | (243,000)
Consumer loans, other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 39,000 | 53,000 | 42,000
Provision for credit losses - loans | 24,000 | 2,000 | 14,000
Charge-offs | (6,000) | (9,000) | (4,000)
Recoveries | 1,000 | 0 | 1,000
Allowance for loan losses, Ending Allowance | 58,000 | 39,000 | 53,000
Consumer loans, other | Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | (7,000) |
Allowance for loan losses, Ending Allowance |  |  | (7,000)
Commercial business loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 2,640,000 | 1,967,000 | 1,801,000
Provision for credit losses - loans | 192,000 | 277,000 | 181,000
Charge-offs | (241,000) | (92,000) | (15,000)
Recoveries | 6,000 | 4,000 | 0
Allowance for loan losses, Ending Allowance | $ 2,597,000 | 2,640,000 | 1,967,000
Commercial business loans | Impact of Adopting CECL (ASU 2016-13) |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance |  | $ 484,000 |
Allowance for loan losses, Ending Allowance |  |  | $ 484,000

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