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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, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | $ 9,530 | $ 9,553 | $ 9,826
Provision for (Recapture of) Loan Losses | 0 | 0 | (1,250)
Charge-offs | (161) | (56) | (133)
Recoveries | 321 | 33 | 1,110
Allowance for loan losses, Ending Allowance | 9,690 | 9,530 | 9,553
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 1,086 | 1,082 | 1,239
Provision for (Recapture of) Loan Losses | (23) | 4 | (178)
Charge-offs | 0 | 0 | 0
Recoveries | 104 | 0 | 21
Allowance for loan losses, Ending Allowance | 1,167 | 1,086 | 1,082
Mortgage loans, multi-family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 433 | 447 | 473
Provision for (Recapture of) Loan Losses | 48 | (14) | (26)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 481 | 433 | 447
Mortgage loans, commercial |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 4,248 | 4,184 | 4,384
Provision for (Recapture of) Loan Losses | (260) | 92 | (1,248)
Charge-offs | 0 | (28) | (13)
Recoveries | 166 | 0 | 1,061
Allowance for loan losses, Ending Allowance | 4,154 | 4,248 | 4,184
Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 671 | 699 | 619
Provision for (Recapture of) Loan Losses | 82 | (28) | 80
Charge-offs | 0 | 0 | 0
Recoveries | 2 | 0 | 0
Allowance for loan losses, Ending Allowance | 755 | 671 | 699
Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 178 | 128 | 130
Provision for (Recapture of) Loan Losses | 34 | 37 | (8)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 13 | 6
Allowance for loan losses, Ending Allowance | 212 | 178 | 128
Mortgage loans, construction - commercial |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 563 | 303 | 268
Provision for (Recapture of) Loan Losses | (225) | 260 | 35
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 338 | 563 | 303
Mortgage loans, construction - multi-family |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 135 | 173 | 316
Provision for (Recapture of) Loan Losses | 240 | (38) | (143)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 375 | 135 | 173
Mortgage loans - construction - land development |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 49 | 0 |
Provision for (Recapture of) Loan Losses | 18 | 49 |
Charge-offs | 0 | 0 |
Recoveries | 0 | 0 |
Allowance for loan losses, Ending Allowance | 67 | 49 | 0
Mortgage loans, land |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 844 | 918 | 820
Provision for (Recapture of) Loan Losses | (116) | (71) | 189
Charge-offs | (49) | (22) | (110)
Recoveries | 18 | 19 | 19
Allowance for loan losses, Ending Allowance | 697 | 844 | 918
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 649 | 983 | 939
Provision for (Recapture of) Loan Losses | (21) | (334) | 44
Charge-offs | (5) | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 623 | 649 | 983
Consumer loans, other |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 117 | 121 | 156
Provision for (Recapture of) Loan Losses | (19) | 1 | (28)
Charge-offs | (5) | (6) | (10)
Recoveries | 6 | 1 | 3
Allowance for loan losses, Ending Allowance | 99 | 117 | 121
Commercial business loans |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 557 | 515 | 482
Provision for (Recapture of) Loan Losses | 242 | 42 | 33
Charge-offs | (102) | 0 | 0
Recoveries | 25 | 0 | 0
Allowance for loan losses, Ending Allowance | $ 722 | $ 557 | $ 515

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