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Loans Receivable and Allowance for Loan Losses: Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 5,041 | $ 5,237 | $ 3,949
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 732 | 700 | 323
Impaired Financing Receivable, Recorded Investment | 5,773 | 5,937 | 4,272
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 5,129 | 5,446 | 4,200
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 732 | 700 | 323
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 5,861 | 6,146 | 4,523
Impaired Financing Receivable, Related Allowance | 41 | 172 | 97
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 5,251 | 4,731 | 4,304
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 681 | 606 | 1,603
Impaired Financing Receivable, Average Recorded Investment | 5,932 | 5,337 | 5,907
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 177 | 331 | 215
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized | 16 | 30 | 53
Impaired Financing Receivable, Interest Income Recognized | 193 | 361 | 268
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 141 | 287 | 175
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized | 8 | 30 | 42
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 149 | 317 | 217
Mortgage loans, one-to-four family |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 659 | 1,192 | 1,054
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 484 |  | 0
Impaired Financing Receivable, Recorded Investment | 1,143 | 1,192 | 1,054
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 703 | 1,236 | 1,200
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 484 |  | 0
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 1,187 | 1,236 | 1,200
Impaired Financing Receivable, Related Allowance | 3 | 0 | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1,127 | 1,110 | 1,422
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 194 |  | 9
Impaired Financing Receivable, Average Recorded Investment | 1,321 | 1,110 | 1,431
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 44 | 71 | 80
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized | 16 |  | 0
Impaired Financing Receivable, Interest Income Recognized | 60 | 71 | 80
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 34 | 62 | 69
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized | 8 |  | 0
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 42 | 62 | 69
Mortgage loans, commercial |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 3,242 | 3,190 | 2,446
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 0
Impaired Financing Receivable, Recorded Investment | 3,242 | 3,190 | 2,446
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 3,242 | 3,190 | 2,446
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  | 0
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 3,242 | 3,190 | 2,446
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 | 3,236 | 2,920 | 2,389
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  |  | 760
Impaired Financing Receivable, Average Recorded Investment | 3,236 | 2,920 | 3,149
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 133 | 227 | 121
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized |  |  | 28
Impaired Financing Receivable, Interest Income Recognized | 133 | 227 | 149
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 107 | 192 | 93
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized |  |  | 21
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 107 | 192 | 114
Mortgage loans, land |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 394 | 63 | 90
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 | 141 | 153
Impaired Financing Receivable, Recorded Investment | 394 | 204 | 243
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 438 | 126 | 195
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 0 | 141 | 153
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 438 | 267 | 348
Impaired Financing Receivable, Related Allowance | 0 | 27 | 34
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 125 | 100 | 283
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 110 | 246 | 383
Impaired Financing Receivable, Average Recorded Investment | 235 | 346 | 666
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 0 | 3 | 11
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized | 0 | 0 | 9
Impaired Financing Receivable, Interest Income Recognized | 0 | 3 | 20
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 0 | 3 | 10
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized | 0 | 0 | 8
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 0 | 3 | 18
Consumer loans, home equity and second mortgage |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 555 | 603 | 359
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 0
Impaired Financing Receivable, Recorded Investment | 555 | 603 | 359
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 555 | 603 | 359
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  | 0
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 555 | 603 | 359
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 | 581 | 459 | 210
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  |  | 310
Impaired Financing Receivable, Average Recorded Investment | 581 | 459 | 520
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 0 | 0 | 3
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized |  |  | 16
Impaired Financing Receivable, Interest Income Recognized | 0 | 0 | 19
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 0 | 0 | 3
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized |  |  | 13
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 0 | 0 | 16
Commercial business loans |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 182 | 189 |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 248 | 536 | 170
Impaired Financing Receivable, Recorded Investment | 430 | 725 | 170
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 182 | 291 |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 248 | 536 | 170
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 430 | 827 | 170
Impaired Financing Receivable, Related Allowance | 38 | 128 | 63
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 176 | 142 |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 370 | 350 | 141
Impaired Financing Receivable, Average Recorded Investment | 546 | 492 | 141
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 0 | 30 |
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized | 0 | 30 | 0
Impaired Financing Receivable, Interest Income Recognized | 0 | 60 | 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 0 | 30 |
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized | 0 | 30 | 0
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 0 | 60 | $ 0
Consumer loans, other |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 9 |  |
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 0 | 23 |
Impaired Financing Receivable, Recorded Investment | 9 | 23 |
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 9 |  |
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 0 | 23 |
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 9 | 23 |
Impaired Financing Receivable, Related Allowance | 0 | 17 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 6 |  |
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 7 | 10 |
Impaired Financing Receivable, Average Recorded Investment | 13 | 10 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 0 |  |
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 No Related Allowance, Cash Basis Interest Income Recognized | 0 |  |
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized | 0 | 0 |
Impaired Financing Receivable, Cash Basis Interest Income Recognized | $ 0 | $ 0 |

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