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Loans Receivable And Allowance For Loan Losses: Impaired Financing Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2021 | Sep. 30, 2020
Recorded Investment |  |  |  |  |
With no related allowance recorded | $ 4,875 |  | $ 4,875 | $ 5,041 |
With an allowance recorded | 294 |  | 294 | 732 |
Total: | 5,169 |  | 5,169 | 5,773 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |  |
With no related allowance recorded | 4,956 |  | 4,956 | 5,129 |
With an allowance recorded | 294 |  | 294 | 732 |
Total: | 5,250 |  | 5,250 | 5,861 |
Related Allowance | 73 |  | 73 | 41 |
Average Recorded Investment |  |  |  |  |
With no related allowance recorded | 5,016 | [1] | 5,024 | 5,251 |
With an allowance recorded | 295 | [1] | 440 | 681 |
Total | 5,311 | [1] | 5,464 | 5,932 |
Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 61 | [1] | 123 | 177 | [1]
With an allowance recorded | 0 | [1] | 0 | 16 |
Total | 61 | [1] | 123 | 193 |
Cash Basis Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 51 | [1] | 101 | 141 |
With an allowance recorded | 0 | [1] | 0 | 8 |
Total | 51 | [1] | 101 | 149 |
Mortgage loans, one-to-four family |  |  |  |  |
Recorded Investment |  |  |  |  |
With no related allowance recorded | 895 |  | 895 | 659 |
With an allowance recorded | 0 |  | 0 | 484 |
Total: | 895 |  | 895 | 1,143 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |  |
With no related allowance recorded | 938 |  | 938 | 703 |
With an allowance recorded | 0 |  | 0 | 484 |
Total: | 938 |  | 938 | 1,187 |
Related Allowance | 0 |  | 0 | 3 |
Average Recorded Investment |  |  |  |  |
With no related allowance recorded | 899 | [1] | 819 | 1,127 |
With an allowance recorded | 0 | [1] | 161 | 194 |
Total | 899 | [1] | 980 | 1,321 |
Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 19 | [1] | 41 | 44 | [1]
With an allowance recorded | 0 | [1] | 0 | 16 |
Total | 19 | [1] | 41 | 60 |
Cash Basis Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 16 | [1] | 36 | 34 |
With an allowance recorded | 0 | [1] | 0 | 8 |
Total | 16 | [1] | 36 | 42 |
Mortgage loans, commercial |  |  |  |  |
Recorded Investment |  |  |  |  |
With no related allowance recorded | 3,028 |  | 3,028 | 3,242 |
Total: | 3,028 |  | 3,028 | 3,242 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |  |
With no related allowance recorded | 3,028 |  | 3,028 | 3,242 |
Total: | 3,028 |  | 3,028 | 3,242 |
Related Allowance | 0 |  | 0 | 0 |
Average Recorded Investment |  |  |  |  |
With no related allowance recorded | 3,028 | [1] | 3,099 | 3,236 |
Total | 3,028 | [1] | 3,099 | 3,236 |
Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 40 | [1] | 80 | 133 | [1]
Total | 40 | [1] | 80 | 133 |
Cash Basis Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 33 | [1] | 63 | 107 |
Total | 33 | [1] | 63 | 107 |
Mortgage loans, land |  |  |  |  |
Recorded Investment |  |  |  |  |
With no related allowance recorded | 173 |  | 173 | 394 |
With an allowance recorded |  |  |  | 0 |
Total: | 173 |  | 173 | 394 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |  |
With no related allowance recorded | 208 |  | 208 | 438 |
With an allowance recorded |  |  |  | 0 |
Total: | 208 |  | 208 | 438 |
Related Allowance | 0 |  | 0 | 0 |
Average Recorded Investment |  |  |  |  |
With no related allowance recorded | 289 | [1] | 324 | 125 |
With an allowance recorded |  |  |  | 110 |
Total | 289 | [1] | 324 | 235 |
Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 1 | [1] | 1 | 0 | [1]
With an allowance recorded |  |  |  | 0 |
Total | 1 | [1] | 1 | 0 |
Cash Basis Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 1 | [1] | 1 | 0 |
With an allowance recorded |  |  |  | 0 |
Total | 1 | [1] | 1 | 0 |
Consumer loans, home equity and second mortgage |  |  |  |  |
Recorded Investment |  |  |  |  |
With no related allowance recorded | 538 |  | 538 | 555 |
Total: | 538 |  | 538 | 555 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |  |
With no related allowance recorded | 538 |  | 538 | 555 |
Total: | 538 |  | 538 | 555 |
Related Allowance | 0 |  | 0 | 0 |
Average Recorded Investment |  |  |  |  |
With no related allowance recorded | 573 | [1] | 567 | 581 |
Total | 573 | [1] | 567 | 581 |
Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 1 | [1] | 1 | 0 | [1]
Total | 1 | [1] | 1 | 0 |
Cash Basis Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 1 | [1] | 1 | 0 |
Total | 1 | [1] | 1 | 0 |
Consumer loans, other |  |  |  |  |
Recorded Investment |  |  |  |  |
With no related allowance recorded | 8 |  | 8 | 9 |
With an allowance recorded |  |  |  | 0 |
Total: | 8 |  | 8 | 9 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |  |
With no related allowance recorded | 8 |  | 8 | 9 |
With an allowance recorded |  |  |  | 0 |
Total: | 8 |  | 8 | 9 |
Related Allowance | 0 |  | 0 | 0 |
Average Recorded Investment |  |  |  |  |
With no related allowance recorded | 9 | [1] | 9 | 6 |
With an allowance recorded |  |  |  | 7 |
Total | 9 | [1] | 9 | 13 |
Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 0 | [1] | 0 | 0 |
With an allowance recorded |  |  |  | 0 |
Total | 0 | [1] | 0 | 0 |
Cash Basis Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 0 | [1] | 0 |  |
With an allowance recorded |  |  |  | 0 |
Total | 0 | [1] | 0 | 0 |
Commercial business loans |  |  |  |  |
Recorded Investment |  |  |  |  |
With no related allowance recorded | 233 |  | 233 | 182 |
With an allowance recorded | 294 |  | 294 | 248 |
Total: | 527 |  | 527 | 430 |
Unpaid Principal Balance (Loan Balance Plus Charge Off) |  |  |  |  |
With no related allowance recorded | 236 |  | 236 | 182 |
With an allowance recorded | 294 |  | 294 | 248 |
Total: | 530 |  | 530 | 430 |
Related Allowance | 73 |  | 73 | 38 |
Average Recorded Investment |  |  |  |  |
With no related allowance recorded | 218 | [1] | 206 | 176 |
With an allowance recorded | 295 |  | 279 | 370 |
Total | 513 | [1] | 485 | 546 |
Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 0 | [1] | 0 | 0 | [1]
With an allowance recorded | 0 | [1] | 0 | 0 |
Total | 0 | [1] | 0 | 0 |
Cash Basis Interest Income Recognized |  |  |  |  |
With no related allowance recorded | 0 | [1] | 0 | 0 |
With an allowance recorded | 0 | [1] | 0 | 0 |
Total | $ 0 | [1] | $ 0 | $ 0 |
[1] | For the three months ended March 31, 2021

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