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Loans Receivable and Allowance for Loan Losses: Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | $ 3,764 | $ 4,282 | $ 4,568
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 245 | 250 | 656
Impaired Financing Receivable, Recorded Investment | 4,009 | 4,532 | 5,224
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 3,857 | 4,375 | 4,615
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 245 | 250 | 656
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 4,102 | 4,625 | 5,271
Impaired Financing Receivable, Related Allowance | 123 | 127 | 247
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 4,102 | 4,567 | 4,750
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 247 | 413 | 454
Impaired Financing Receivable, Average Recorded Investment | 4,349 | 4,980 | 5,204
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 213 | 189 | 220
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized | 0 | 0 | 0
Impaired Financing Receivable, Interest Income Recognized | 213 | 189 | 220
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 172 | 159 | 182
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized | 0 | 0 | 0
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 172 | 159 | 182
Mortgage loans, one-to-four family |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 368 | 388 | 407
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 0
Impaired Financing Receivable, Recorded Investment | 368 | 388 | 407
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 412 | 432 | 450
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) | 412 | 432 | 450
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 | 378 | 470 | 655
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  |  | 97
Impaired Financing Receivable, Average Recorded Investment | 378 | 470 | 752
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 29 | 31 | 58
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized |  |  | 0
Impaired Financing Receivable, Interest Income Recognized | 29 | 31 | 58
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 29 | 31 | 52
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized |  |  | 0
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 29 | 31 | 52
Mortgage loans, commercial |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 2,973 | 2,988 | 3,143
Impaired Financing Receivable, Recorded Investment | 2,973 | 2,988 | 3,143
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 2,973 | 2,988 | 3,143
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 2,973 | 2,988 | 3,143
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 | 2,987 | 3,041 | 3,039
Impaired Financing Receivable, Average Recorded Investment | 2,987 | 3,041 | 3,039
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 167 | 152 | 159
Impaired Financing Receivable, Interest Income Recognized | 167 | 152 | 159
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 129 | 123 | 127
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 129 | 123 | 127
Mortgage loans, land |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 | 450 | 321
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  |  | 362
Impaired Financing Receivable, Recorded Investment | 0 | 450 | 683
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 0 | 450 | 321
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  | 362
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 0 | 450 | 683
Impaired Financing Receivable, Related Allowance | 0 | 0 | 76
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 297 | 492 | 292
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  |  | 72
Impaired Financing Receivable, Average Recorded Investment | 297 | 492 | 364
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 5 | 0 | 2
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized |  |  | 0
Impaired Financing Receivable, Interest Income Recognized | 5 | 0 | 2
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 4 | 0 | 2
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized |  |  | 0
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 4 | 0 | 2
Consumer loans, home equity and second mortgage |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 382 | 394 | 516
Impaired Financing Receivable, with Related Allowance, Recorded Investment |  | 0 |
Impaired Financing Receivable, Recorded Investment | 382 | 394 | 516
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 382 | 394 | 516
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) | 382 | 394 | 516
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 | 390 | 436 | 552
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment |  | 145 |
Impaired Financing Receivable, Average Recorded Investment | 390 | 581 | 552
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 12 | 6 | 1
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized |  | 0 |
Impaired Financing Receivable, Interest Income Recognized | 12 | 6 | 1
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 10 | 5 | 1
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized |  | 0 |
Impaired Financing Receivable, Cash Basis Interest Income Recognized | 10 | 5 | 1
Consumer loans, other |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  | 3 |
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) |  | 3 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  | 7 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized |  | 0 |
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized |  | 0 |
Consumer loans, other |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 0 |  |
Impaired Financing Receivable, Recorded Investment | 0 | 3 |
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 | 3 |
Impaired Financing Receivable, Related Allowance | 0 | 0 |
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 1 |  |
Impaired Financing Receivable, Average Recorded Investment | 1 | 7 |
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 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, Cash Basis Interest Income Recognized | 0 | 0 |
Consumer Loan, Other [Member] |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment |  |  | 17
Impaired Financing Receivable, Recorded Investment |  |  | 17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  | 17
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  | 17
Impaired Financing Receivable, Related Allowance |  |  | 0
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment |  |  | 12
Impaired Financing Receivable, Average Recorded Investment |  |  | 12
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized |  |  | 0
Impaired Financing Receivable, Interest Income Recognized |  |  | 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, Cash Basis Interest Income Recognized |  |  | 0
Commercial business loans |  |  |
Impaired Financing Receivable, Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Recorded Investment | 41 | 59 | 164
Impaired Financing Receivable, with Related Allowance, Recorded Investment | 245 | 250 | 294
Impaired Financing Receivable, Recorded Investment | 286 | 309 | 458
Impaired Financing Receivable, Unpaid Principal Balance [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 90 | 108 | 168
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 245 | 250 | 294
Impaired Financing Receivable, Unpaid Principal Balance (Loan Balance Plus Charge Off) | 335 | 358 | 462
Impaired Financing Receivable, Related Allowance | 123 | 127 | 171
Impaired Financing Receivable, Average Recorded Investment [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment | 49 | 121 | 200
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment | 247 | 268 | 285
Impaired Financing Receivable, Average Recorded Investment | 296 | 389 | 485
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Interest Income Recognized | 0 | 0 | 0
Impaired Financing Receivable, with Related Allowance, Interest Income Recognized | 0 | 0 | 0
Impaired Financing Receivable, Interest Income Recognized | 0 | 0 | 0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract] |  |  |
Impaired Financing Receivable, with No Related Allowance, Cash Basis Interest Income Recognized | 0 | 0 | 0
Impaired Financing Receivable, with Related Allowance, Cash Basis Interest Income Recognized | 0 | 0 | 0
Impaired Financing Receivable, Cash Basis Interest Income Recognized | $ 0 | $ 0 | $ 0

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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-15 + Details
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