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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, 2018
Mar. 31, 2018
Sep. 30, 2017
Recorded Investment      
With no related allowance recorded $ 4,526 $ 4,526 $ 3,830
With an allowance recorded 670 670 3,162
Total: 5,196 5,196 6,992
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 4,792 4,792 4,089
With an allowance recorded 670 670 3,221
Total: 5,462 5,462 7,310
Related Allowance 396 396 476
Average Recorded Investment      
With no related allowance recorded 4,168 [1] 4,054 5,963 [2]
With an allowance recorded 1,992 [1] 2,382 5,260 [2]
Total 6,160 [1] 6,436 11,223 [2]
Interest Income Recognized      
With no related allowance recorded 81 [1] 126 271 [2]
With an allowance recorded 6 [1] 48 296 [2]
Total 87 [1] 174 567 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 70 [1] 106 218 [2]
With an allowance recorded 6 [1] 39 237 [2]
Total 76 [1] 145 455 [2]
Mortgage loans, one-to-four family      
Recorded Investment      
With no related allowance recorded 1,318 1,318 1,443
With an allowance recorded 0 0 0
Total: 1,318 1,318 1,443
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 1,464 1,464 1,589
With an allowance recorded 0 0 0
Total: 1,464 1,464 1,589
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 1,371 [1] 1,395 1,108 [2]
With an allowance recorded 22 [1] 15 721 [2]
Total 1,393 [1] 1,410 1,829 [2]
Interest Income Recognized      
With no related allowance recorded 22 [1] 42 68 [2]
With an allowance recorded 0 [1] 0 50 [2]
Total 22 [1] 42 118 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 19 [1] 36 62 [2]
With an allowance recorded 0 [1] 0 38 [2]
Total 19 [1] 36 100 [2]
Mortgage loans, commercial      
Recorded Investment      
With no related allowance recorded 2,578 2,578 1,967
With an allowance recorded 0 0 1,906
Total: 2,578 2,578 3,873
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 2,606 2,606 1,967
With an allowance recorded 0 0 1,906
Total: 2,606 2,606 3,873
Related Allowance 0 0 26
Average Recorded Investment      
With no related allowance recorded 2,365 [1] 2,232 3,901 [2]
With an allowance recorded 947 [1] 1,266 3,326 [2]
Total 3,312 [1] 3,498 7,227 [2]
Interest Income Recognized      
With no related allowance recorded 52 [1] 75 188 [2]
With an allowance recorded 0 [1] 27 182 [2]
Total 52 [1] 102 370 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 45 [1] 62 143 [2]
With an allowance recorded 0 [1] 21 144 [2]
Total 45 [1] 83 287 [2]
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 [2]     147
Total [2]     147
Interest Income Recognized      
With no related allowance recorded [2]     7
Total [2]     7
Cash Basis Interest Income Recognized      
With no related allowance recorded [2]     7
Total [2]     7
Mortgage loans, land      
Recorded Investment      
With no related allowance recorded 445 445 297
With an allowance recorded 195 195 822
Total: 640 640 1,119
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 537 537 410
With an allowance recorded 195 195 881
Total: 732 732 1,291
Related Allowance 40 40 125
Average Recorded Investment      
With no related allowance recorded 245 [1] 262 512 [2]
With an allowance recorded 547 [1] 639 666 [2]
Total 792 [1] 901 1,178 [2]
Interest Income Recognized      
With no related allowance recorded 6 [1] 6 8 [2]
With an allowance recorded 0 [1] 9 35 [2]
Total 6 [1] 15 43 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 5 [1] 5 6 [2]
With an allowance recorded 0 [1] 8 29 [2]
Total 5 [1] 13 35 [2]
Consumer loans, home equity and second mortgage      
Recorded Investment      
With no related allowance recorded 185 185 123
With an allowance recorded 294 294 434
Total: 479 479 557
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 185 185 123
With an allowance recorded 294 294 434
Total: 479 479 557
Related Allowance 293 293 325
Average Recorded Investment      
With no related allowance recorded 187 [1] 165 284 [2]
With an allowance recorded 295 [1] 341 530 [2]
Total 482 [1] 506 814 [2]
Interest Income Recognized      
With no related allowance recorded 1 [1] 3 0 [2]
With an allowance recorded 6 [1] 12 29 [2]
Total 7 [1] 15 29 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 1 [1] 3 0 [2]
With an allowance recorded 6 [1] 10 26 [2]
Total 7 [1] 13 26 [2]
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 [2]     17
Total [2]     17
Interest Income Recognized      
With an allowance recorded [2]     0
Total [2]     0
Cash Basis Interest Income Recognized      
With an allowance recorded [2]     0
Total [2]     0
Commercial business loans      
Recorded Investment      
With no related allowance recorded     0
With an allowance recorded 181 181  
Total: 181 181 0
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded     0
With an allowance recorded 181 181  
Total: 181 181 0
Related Allowance 63 63 0
Average Recorded Investment      
With no related allowance recorded [2]     11
With an allowance recorded   121  
Total 181 [1] 121 11 [2]
Interest Income Recognized      
With no related allowance recorded [2]     0
With an allowance recorded 0 [1] 0  
Total 0 [1] 0 0 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded [2]     0
With an allowance recorded 0 [1] 0  
Total $ 0 [1] $ 0 $ 0 [2]
[1] For the three months ended March 31, 2018
[2] For the year ended September 30, 2017.