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Loans Receivable And Allowance For Loan Losses: Impaired Financing Receivables (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Recorded Investment      
With no related allowance recorded $ 5,409 $ 5,409 $ 3,830
With an allowance recorded 549 549 3,162
Total: 5,958 5,958 6,992
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 5,660 5,660 4,089
With an allowance recorded 549 549 3,221
Total: 6,209 6,209 7,310
Related Allowance 358 358 476
Average Recorded Investment      
With no related allowance recorded 4,969 [1] 4,393 5,963 [2]
With an allowance recorded 611 [1] 1,924 5,260 [2]
Total 5,580 [1] 6,317 11,223 [2]
Interest Income Recognized      
With no related allowance recorded 64 [1] 190 271 [2]
With an allowance recorded 5 [1] 52 296 [2]
Total 69 [1] 242 567 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 54 [1] 159 218 [2]
With an allowance recorded 3 [1] 42 237 [2]
Total 57 [1] 201 455 [2]
Mortgage loans, one-to-four family      
Recorded Investment      
With no related allowance recorded 1,873 1,873 1,443
With an allowance recorded 0 0 0
Total: 1,873 1,873 1,443
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 2,020 2,020 1,589
With an allowance recorded 0 0 0
Total: 2,020 2,020 1,589
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 1,596 [1] 1,514 1,108 [2]
With an allowance recorded 0 [1] 11 721 [2]
Total 1,596 [1] 1,525 1,829 [2]
Interest Income Recognized      
With no related allowance recorded 21 [1] 62 68 [2]
With an allowance recorded 0 [1] 0 50 [2]
Total 21 [1] 62 118 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 18 [1] 53 62 [2]
With an allowance recorded 0 [1] 0 38 [2]
Total 18 [1] 53 100 [2]
Mortgage loans, commercial      
Recorded Investment      
With no related allowance recorded 2,801 2,801 1,967
With an allowance recorded 0 0 1,906
Total: 2,801 2,801 3,873
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 2,801 2,801 1,967
With an allowance recorded 0 0 1,906
Total: 2,801 2,801 3,873
Related Allowance 0 0 26
Average Recorded Investment      
With no related allowance recorded 2,690 [1] 2,374 3,901 [2]
With an allowance recorded 0 [1] 950 3,326 [2]
Total 2,690 [1] 3,324 7,227 [2]
Interest Income Recognized      
With no related allowance recorded 38 [1] 114 188 [2]
With an allowance recorded 0 [1] 27 182 [2]
Total 38 [1] 141 370 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 31 [1] 93 143 [2]
With an allowance recorded 0 [1] 21 144 [2]
Total 31 [1] 114 287 [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 540 540 297
With an allowance recorded 0 0 822
Total: 540 540 1,119
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 644 644 410
With an allowance recorded 881
Total: 644 644 1,291
Related Allowance 0 0 125
Average Recorded Investment      
With no related allowance recorded 493 [1] 332 512 [2]
With an allowance recorded 98 [1] 479 666 [2]
Total 591 [1] 811 1,178 [2]
Interest Income Recognized      
With no related allowance recorded 5 [1] 11 8 [2]
With an allowance recorded 0 [1] 9 35 [2]
Total 5 [1] 20 43 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 5 [1] 10 6 [2]
With an allowance recorded 0 [1] 8 29 [2]
Total 5 [1] 18 35 [2]
Consumer loans, home equity and second mortgage      
Recorded Investment      
With no related allowance recorded 195 195 123
With an allowance recorded 375 375 434
Total: 570 570 557
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 195 195 123
With an allowance recorded 375 375 434
Total: 570 570 557
Related Allowance 297 297 325
Average Recorded Investment      
With no related allowance recorded 190 [1] 173 284 [2]
With an allowance recorded 335 [1] 350 530 [2]
Total 525 [1] 523 814 [2]
Interest Income Recognized      
With no related allowance recorded 0 [1] 3 0 [2]
With an allowance recorded 5 [1] 16 29 [2]
Total 5 [1] 19 29 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 0 [1] 3 0 [2]
With an allowance recorded 3 [1] 13 26 [2]
Total 3 [1] 16 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 174 174  
Total: 174 174 0
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded     0
With an allowance recorded 174 174  
Total: 174 174 0
Related Allowance 61 61 0
Average Recorded Investment      
With no related allowance recorded [2]     11
With an allowance recorded 178 134  
Total 178 [1] 134 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 June 30, 2018
[2] For the year ended September 30, 2017.