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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, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | $ 13,469 | $ 13,414 | $ 9,690
Provision for (Recapture of) Loan Losses | 270 | 0 | 3,700
Charge-offs | (59) | (3) | (27)
Recoveries | 23 | 58 | 51
Allowance for loan losses, Ending Allowance | 13,703 | 13,469 | 13,414
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 1,154 | 1,163 | 1,167
Provision for (Recapture of) Loan Losses | 504 | (9) | (6)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 2
Allowance for loan losses, Ending Allowance | 1,658 | 1,154 | 1,163
Mortgage loans, multi-family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 765 | 718 | 481
Provision for (Recapture of) Loan Losses | 90 | 47 | 237
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 855 | 765 | 718
Mortgage loans, commercial |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 6,813 | 7,144 | 4,154
Provision for (Recapture of) Loan Losses | (131) | (331) | 2,984
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 6
Allowance for loan losses, Ending Allowance | 6,682 | 6,813 | 7,144
Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 644 | 832 | 755
Provision for (Recapture of) Loan Losses | 31 | (188) | 72
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 5
Allowance for loan losses, Ending Allowance | 675 | 644 | 832
Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 188 | 158 | 212
Provision for (Recapture of) Loan Losses | (58) | 30 | (54)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 130 | 188 | 158
Mortgage loans, construction - commercial |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 784 | 420 | 338
Provision for (Recapture of) Loan Losses | (441) | 364 | 82
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 343 | 784 | 420
Mortgage loans, construction - multi-family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 436 | 238 | 375
Provision for (Recapture of) Loan Losses | 11 | 198 | (137)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 447 | 436 | 238
Mortgage loans - construction - land development |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 124 | 133 | 67
Provision for (Recapture of) Loan Losses | 109 | (9) | 66
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 233 | 124 | 133
Mortgage loans, land |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 470 | 572 | 697
Provision for (Recapture of) Loan Losses | (73) | (147) | (145)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 45 | 20
Allowance for loan losses, Ending Allowance | 397 | 470 | 572
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 528 | 593 | 623
Provision for (Recapture of) Loan Losses | (88) | (65) | (45)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 15
Allowance for loan losses, Ending Allowance | 440 | 528 | 593
Consumer loans, other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 50 | 71 | 99
Provision for (Recapture of) Loan Losses | 1 | (24) | (19)
Charge-offs | (10) | (1) | (12)
Recoveries | 1 | 4 | 3
Allowance for loan losses, Ending Allowance | 42 | 50 | 71
Commercial business loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 1,513 | 1,372 | 722
Provision for (Recapture of) Loan Losses | 315 | 134 | 665
Charge-offs | (49) | (2) | (15)
Recoveries | 22 | 9 | 0
Allowance for loan losses, Ending Allowance | $ 1,801 | $ 1,513 | $ 1,372

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