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Loans Receivable And Allowance For Loan Losses: Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017
Recorded Investment |  |  |  |
With no related allowance recorded |  | $ 3,807 | $ 3,830 |
With an allowance recorded |  | 3,313 | 3,162 |
Total: |  | 7,120 | 6,992 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |
With no related allowance recorded |  | 4,049 | 4,089 |
With an allowance recorded |  | 3,313 | 3,221 |
Total: |  | 7,362 | 7,310 |
Related Allowance |  | 435 | 476 |
Average Recorded Investment |  |  |  |
With no related allowance recorded |  | 3,819 | 5,963 | [1]
With an allowance recorded |  | 3,239 | 5,260 | [1]
Total |  | 7,058 | 11,223 | [1]
Interest Income Recognized |  |  |  |
With no related allowance recorded |  | 45 | 271 | [1]
With an allowance recorded |  | 42 | 296 | [1]
Total |  | 87 | 567 | [1]
Cash Basis Interest Income Recognized |  |  |  |
With no related allowance recorded |  | 35 | 218 | [1]
With an allowance recorded |  | 34 | 237 | [1]
Total |  | 69 | 455 | [1]
Mortgage loans, one-to-four family |  |  |  |
Recorded Investment |  |  |  |
With no related allowance recorded |  | 1,423 | 1,443 |
With an allowance recorded |  | 44 | 0 |
Total: |  | 1,467 | 1,443 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |
With no related allowance recorded |  | 1,569 | 1,589 |
With an allowance recorded |  | 44 | 0 |
Total: |  | 1,613 | 1,589 |
Related Allowance |  | 1 | 0 |
Average Recorded Investment |  |  |  |
With no related allowance recorded |  | 1,433 | 1,108 | [1]
With an allowance recorded |  | 22 | 721 | [1]
Total |  | 1,455 | 1,829 | [1]
Interest Income Recognized |  |  |  |
With no related allowance recorded |  | 19 | 68 | [1]
With an allowance recorded |  | 0 | 50 | [1]
Total |  | 19 | 118 | [1]
Cash Basis Interest Income Recognized |  |  |  |
With no related allowance recorded |  | 16 | 62 | [1]
With an allowance recorded |  | 0 | 38 | [1]
Total |  | 16 | 100 | [1]
Mortgage loans, commercial |  |  |  |
Recorded Investment |  |  |  |
With no related allowance recorded |  | 2,151 | 1,967 |
With an allowance recorded |  | 1,893 | 1,906 |
Total: |  | 4,044 | 3,873 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |
With no related allowance recorded |  | 2,151 | 1,967 |
With an allowance recorded |  | 1,893 | 1,906 |
Total: |  | 4,044 | 3,873 |
Related Allowance |  | 16 | 26 |
Average Recorded Investment |  |  |  |
With no related allowance recorded |  | 2,059 | 3,901 | [1]
With an allowance recorded |  | 1,900 | 3,326 | [1]
Total |  | 3,959 | 7,227 | [1]
Interest Income Recognized |  |  |  |
With no related allowance recorded |  | 24 | 188 | [1]
With an allowance recorded |  | 27 | 182 | [1]
Total |  | 51 | 370 | [1]
Cash Basis Interest Income Recognized |  |  |  |
With no related allowance recorded |  | 17 | 143 | [1]
With an allowance recorded |  | 21 | 144 | [1]
Total |  | 38 | 287 | [1]
Mortgage loans, construction - custom and owner/builder |  |  |  |
Recorded Investment |  |  |  |
With no related allowance recorded |  |  | 0 |
Total: |  |  | 0 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |
With no related allowance recorded |  |  | 0 |
Total: |  |  | 0 |
Related Allowance |  |  | 0 |
Average Recorded Investment |  |  |  |
With no related allowance recorded | [1] |  | 147 |
Total | [1] |  | 147 |
Interest Income Recognized |  |  |  |
With no related allowance recorded | [1] |  | 7 |
Total | [1] |  | 7 |
Cash Basis Interest Income Recognized |  |  |  |
With no related allowance recorded | [1] |  | 7 |
Total | [1] |  | 7 |
Mortgage loans, land |  |  |  |
Recorded Investment |  |  |  |
With no related allowance recorded |  | 45 | 297 |
With an allowance recorded |  | 899 | 822 |
Total: |  | 944 | 1,119 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |
With no related allowance recorded |  | 141 | 410 |
With an allowance recorded |  | 899 | 881 |
Total: |  | 1,040 | 1,291 |
Related Allowance |  | 72 | 125 |
Average Recorded Investment |  |  |  |
With no related allowance recorded |  | 171 | 512 | [1]
With an allowance recorded |  | 861 | 666 | [1]
Total |  | 1,032 | 1,178 | [1]
Interest Income Recognized |  |  |  |
With no related allowance recorded |  | 0 | 8 | [1]
With an allowance recorded |  | 9 | 35 | [1]
Total |  | 9 | 43 | [1]
Cash Basis Interest Income Recognized |  |  |  |
With no related allowance recorded |  | 0 | 6 | [1]
With an allowance recorded |  | 8 | 29 | [1]
Total |  | 8 | 35 | [1]
Consumer loans, home equity and second mortgage |  |  |  |
Recorded Investment |  |  |  |
With no related allowance recorded |  | 188 | 123 |
With an allowance recorded |  | 296 | 434 |
Total: |  | 484 | 557 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |
With no related allowance recorded |  | 188 | 123 |
With an allowance recorded |  | 296 | 434 |
Total: |  | 484 | 557 |
Related Allowance |  | 291 | 325 |
Average Recorded Investment |  |  |  |
With no related allowance recorded |  | 156 | 284 | [1]
With an allowance recorded |  | 365 | 530 | [1]
Total |  | 521 | 814 | [1]
Interest Income Recognized |  |  |  |
With no related allowance recorded |  | 2 | 0 | [1]
With an allowance recorded |  | 6 | 29 | [1]
Total |  | 8 | 29 | [1]
Cash Basis Interest Income Recognized |  |  |  |
With no related allowance recorded |  | 2 | 0 | [1]
With an allowance recorded |  | 5 | 26 | [1]
Total |  | 7 | 26 | [1]
Consumer loans, other |  |  |  |
Recorded Investment |  |  |  |
With an allowance recorded |  |  | 0 |
Total: |  |  | 0 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |
With an allowance recorded |  |  | 0 |
Total: |  |  | 0 |
Related Allowance |  |  | 0 |
Average Recorded Investment |  |  |  |
With an allowance recorded | [1] |  | 17 |
Total | [1] |  | 17 |
Interest Income Recognized |  |  |  |
With an allowance recorded | [1] |  | 0 |
Total | [1] |  | 0 |
Cash Basis Interest Income Recognized |  |  |  |
With an allowance recorded | [1] |  | 0 |
Total | [1] |  | 0 |
Commercial business loans |  |  |  |
Recorded Investment |  |  |  |
With no related allowance recorded |  |  | 0 |
With an allowance recorded |  | 181 |  |
Total: |  | 181 | 0 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |
With no related allowance recorded |  |  | 0 |
With an allowance recorded |  | 181 |  |
Total: |  | 181 | 0 |
Related Allowance |  | 55 | 0 |
Average Recorded Investment |  |  |  |
With no related allowance recorded | [1] |  | 11 |
With an allowance recorded |  | 91 |  |
Total |  | 91 | 11 | [1]
Interest Income Recognized |  |  |  |
With no related allowance recorded | [1] |  | 0 |
With an allowance recorded |  | 0 |  |
Total |  | 0 | 0 | [1]
Cash Basis Interest Income Recognized |  |  |  |
With no related allowance recorded | [1] |  | 0 |
With an allowance recorded |  | 0 |  |
Total |  | $ 0 | $ 0 | [1]
[1] | For the year ended September 30, 2017.

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