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Loans Receivable and Allowance for Loan Losses: Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 5,237 | $ 3,949 | $ 3,830
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 700 | 323 | 3,162
Impaired Financing Receivable, Recorded Investment | 5,937 | 4,272 | 6,992
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 5,446 | 4,200 | 4,089
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 700 | 323 | 3,221
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 6,146 | 4,523 | 7,310
Impaired Financing Receivable, Related Allowance | 172 | 97 | 476
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,731 | 4,304 | 5,963
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 606 | 1,603 | 5,260
Impaired Financing Receivable, Average Recorded Investment | 5,337 | 5,907 | 11,223
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 331 | 215 | 271
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized | 30 | 53 | 296
Impaired Financing Receivable, Interest Income Recognized | 361 | 268 | 567
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 287 | 175 | 218
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized | 30 | 42 | 237
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 317 | 217 | 455
Mortgage loans, one-to-four family |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 1,192 | 1,054 | 1,443
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  | 0 | 0
Impaired Financing Receivable, Recorded Investment | 1,192 | 1,054 | 1,443
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 1,236 | 1,200 | 1,589
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) |  | 0 | 0
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 1,236 | 1,200 | 1,589
Impaired Financing Receivable, Related Allowance | 0 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,110 | 1,422 | 1,108
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 9 | 721
Impaired Financing Receivable, Average Recorded Investment | 1,110 | 1,431 | 1,829
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 71 | 80 | 68
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized |  | 0 | 50
Impaired Financing Receivable, Interest Income Recognized | 71 | 80 | 118
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 62 | 69 | 62
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized |  | 0 | 38
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 62 | 69 | 100
Mortgage loans, commercial |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,190 | 2,446 | 1,967
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  | 0 | 1,906
Impaired Financing Receivable, Recorded Investment | 3,190 | 2,446 | 3,873
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 3,190 | 2,446 | 1,967
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) |  | 0 | 1,906
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 3,190 | 2,446 | 3,873
Impaired Financing Receivable, Related Allowance | 0 | 0 | 26
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 2,920 | 2,389 | 3,901
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 760 | 3,326
Impaired Financing Receivable, Average Recorded Investment | 2,920 | 3,149 | 7,227
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 227 | 121 | 188
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized |  | 28 | 182
Impaired Financing Receivable, Interest Income Recognized | 227 | 149 | 370
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 192 | 93 | 143
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized |  | 21 | 144
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 192 | 114 | 287
Mortgage loans, construction - custom and owner/builder |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  | 0
Impaired Financing Receivable, Recorded Investment |  |  | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  | 0
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  | 0
Impaired Financing Receivable, Related Allowance |  |  | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  |  | 147
Impaired Financing Receivable, Average Recorded Investment |  |  | 147
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized |  |  | 7
Impaired Financing Receivable, Interest Income Recognized |  |  | 7
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized |  |  | 7
Impaired Financing Receivable, Cash Basis Interest Income Recognized |  |  | 7
Mortgage loans, land |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 63 | 90 | 297
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 141 | 153 | 822
Impaired Financing Receivable, Recorded Investment | 204 | 243 | 1,119
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 126 | 195 | 410
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 141 | 153 | 881
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 267 | 348 | 1,291
Impaired Financing Receivable, Related Allowance | 27 | 34 | 125
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 100 | 283 | 512
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 246 | 383 | 666
Impaired Financing Receivable, Average Recorded Investment | 346 | 666 | 1,178
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 3 | 11 | 8
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized | 0 | 9 | 35
Impaired Financing Receivable, Interest Income Recognized | 3 | 20 | 43
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 3 | 10 | 6
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized | 0 | 8 | 29
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 3 | 18 | 35
Consumer loans, home equity and second mortgage |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 603 | 359 | 123
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  | 0 | 434
Impaired Financing Receivable, Recorded Investment | 603 | 359 | 557
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 603 | 359 | 123
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) |  | 0 | 434
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 603 | 359 | 557
Impaired Financing Receivable, Related Allowance | 0 | 0 | 325
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 459 | 210 | 284
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 310 | 530
Impaired Financing Receivable, Average Recorded Investment | 459 | 520 | 814
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 0 | 3 | 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized |  | 16 | 29
Impaired Financing Receivable, Interest Income Recognized | 0 | 19 | 29
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 0 | 3 | 0
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized |  | 13 | 26
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 0 | 16 | 26
Other |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 23 |  | 0
Impaired Financing Receivable, Recorded Investment | 23 |  | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 23 |  | 0
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 23 |  | 0
Impaired Financing Receivable, Related Allowance | 17 |  | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 10 |  | 17
Impaired Financing Receivable, Average Recorded Investment | 10 |  | 17
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized | 0 |  | 0
Impaired Financing Receivable, Interest Income Recognized | 0 |  | 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized | 0 |  | 0
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 0 |  | 0
Commercial business loans |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 189 |  | 0
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 536 | 170 |
Impaired Financing Receivable, Recorded Investment | 725 | 170 | 0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 291 |  | 0
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 536 | 170 |
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 827 | 170 | 0
Impaired Financing Receivable, Related Allowance | 128 | 63 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 142 |  | 11
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 350 | 141 |
Impaired Financing Receivable, Average Recorded Investment | 492 | 141 | 11
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 30 |  | 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized | 30 | 0 |
Impaired Financing Receivable, Interest Income Recognized | 60 | 0 | 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 30 |  | 0
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized | 30 | 0 |
Impaired Financing Receivable, Cash Basis Interest Income Recognized | $ 60 | $ 0 | $ 0

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