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Loans Receivable and Allowance for Loan Losses: Schedule of Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | $ 13,703 | $ 13,469 | $ 13,414
Provision for (Recapture of) Loan Losses | 2,132 | 270 | 0
Charge-offs | (19) | (59) | (3)
Recoveries | 1 | 23 | 58
Allowance for loan losses, Ending Allowance | 15,817 | 13,703 | 13,469
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 1,658 | 1,154 | 1,163
Provision for (Recapture of) Loan Losses | 759 | 504 | (9)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 2,417 | 1,658 | 1,154
Mortgage loans, multi-family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 855 | 765 | 718
Provision for (Recapture of) Loan Losses | 301 | 90 | 47
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 1,156 | 855 | 765
Mortgage loans, commercial |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 6,682 | 6,813 | 7,144
Provision for (Recapture of) Loan Losses | 527 | (131) | (331)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 7,209 | 6,682 | 6,813
Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 675 | 644 | 832
Provision for (Recapture of) Loan Losses | 75 | 31 | (188)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 750 | 675 | 644
Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 130 | 188 | 158
Provision for (Recapture of) Loan Losses | 18 | (58) | 30
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 148 | 130 | 188
Mortgage loans, construction - commercial |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 343 | 784 | 420
Provision for (Recapture of) Loan Losses | (27) | (441) | 364
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 316 | 343 | 784
Mortgage loans, construction - multi-family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 447 | 436 | 238
Provision for (Recapture of) Loan Losses | 155 | 11 | 198
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 602 | 447 | 436
Mortgage loans - construction - land development |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 233 | 124 | 133
Provision for (Recapture of) Loan Losses | 41 | 109 | (9)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 274 | 233 | 124
Mortgage loans, land |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 397 | 470 | 572
Provision for (Recapture of) Loan Losses | 9 | (73) | (147)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 45
Allowance for loan losses, Ending Allowance | 406 | 397 | 470
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 440 | 528 | 593
Provision for (Recapture of) Loan Losses | 79 | (88) | (65)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 519 | 440 | 528
Consumer loans, other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 42 | 50 | 71
Provision for (Recapture of) Loan Losses | 14 | 1 | (24)
Charge-offs | (4) | (10) | (1)
Recoveries | 1 | 1 | 4
Allowance for loan losses, Ending Allowance | 53 | 42 | 50
Commercial business loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 1,801 | 1,513 | 1,372
Provision for (Recapture of) Loan Losses | 181 | 315 | 134
Charge-offs | (15) | (49) | (2)
Recoveries | 0 | 22 | 9
Allowance for loan losses, Ending Allowance | $ 1,967 | $ 1,801 | $ 1,513

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