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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, 2019
Jun. 30, 2019
Sep. 30, 2018
Recorded Investment      
With no related allowance recorded $ 5,560 $ 5,560 $ 3,949
With an allowance recorded 706 706 323
Total: 6,266 6,266 4,272
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 5,763 5,763 4,200
With an allowance recorded 706 706 323
Total: 6,469 6,469 4,523
Related Allowance 259 259 97
Average Recorded Investment      
With no related allowance recorded 5,259 [1] 4,603 4,304 [2]
With an allowance recorded 713 [1] 582 1,603 [2]
Total 5,972 [1] 5,185 5,907 [2]
Interest Income Recognized      
With no related allowance recorded 117 [1] 234 215 [2]
With an allowance recorded 0 [1] 25 53 [2]
Total 117 [1] 259 268 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 106 [1] 202 175 [2]
With an allowance recorded 0 [1] 25 42 [2]
Total 106 [1] 227 217 [2]
Mortgage loans, one-to-four family      
Recorded Investment      
With no related allowance recorded 1,220 1,220 1,054
With an allowance recorded     0
Total: 1,220 1,220 1,054
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 1,301 1,301 1,200
With an allowance recorded     0
Total: 1,301 1,301 1,200
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 1,145 [1] 1,089 1,422 [2]
With an allowance recorded [2]     9
Total 1,145 [1] 1,089 1,431 [2]
Interest Income Recognized      
With no related allowance recorded 18 [1] 53 80 [2]
With an allowance recorded [2]     0
Total 18 [1] 53 80 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 15 [1] 47 69 [2]
With an allowance recorded [2]     0
Total 15 [1] 47 69 [2]
Mortgage loans, commercial      
Recorded Investment      
With no related allowance recorded 3,255 3,255 2,446
With an allowance recorded     0
Total: 3,255 3,255 2,446
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 3,255 3,255 2,446
With an allowance recorded     0
Total: 3,255 3,255 2,446
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 3,263 [1] 2,852 2,389 [2]
With an allowance recorded [2]     760
Total 3,263 [1] 2,852 3,149 [2]
Interest Income Recognized      
With no related allowance recorded 78 [1] 158 121 [2]
With an allowance recorded [2]     28
Total 78 [1] 158 149 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 70 [1] 132 93 [2]
With an allowance recorded [2]     21
Total 70 [1] 132 114 [2]
Mortgage loans, land      
Recorded Investment      
With no related allowance recorded 279 279 90
With an allowance recorded 143 143 153
Total: 422 422 243
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 393 393 195
With an allowance recorded 143 143 153
Total: 536 536 348
Related Allowance 37 37 34
Average Recorded Investment      
With no related allowance recorded 174 [1] 109 283 [2]
With an allowance recorded 268 [1] 233 383 [2]
Total 442 [1] 342 666 [2]
Interest Income Recognized      
With no related allowance recorded 3 [1] 3 11 [2]
With an allowance recorded 0 [1] 0 9 [2]
Total 3 [1] 3 20 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 3 [1] 3 10 [2]
With an allowance recorded 0 [1] 0 8 [2]
Total 3 [1] 3 18 [2]
Consumer loans, home equity and second mortgage      
Recorded Investment      
With no related allowance recorded 606 606 359
With an allowance recorded 0 0 0
Total: 606 606 359
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 606 606 359
With an allowance recorded 0 0 0
Total: 606 606 359
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 474 [1] 423 210 [2]
With an allowance recorded 0 [1] 38 310 [2]
Total 474 [1] 461 520 [2]
Interest Income Recognized      
With no related allowance recorded 0 [1] 0 3 [2]
With an allowance recorded 0 [1] 0 16 [2]
Total 0 [1] 0 19 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 0 [1] 0 3 [2]
With an allowance recorded 0 [1] 0 13 [2]
Total 0 [1] 0 16 [2]
Consumer loans, other      
Recorded Investment      
With an allowance recorded 14 14 170
Total: 14 14  
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With an allowance recorded 14 14 170
Total: 14 14  
Related Allowance 8 8 63
Average Recorded Investment      
With an allowance recorded 15 [1] 7 141 [2]
Total 15 [1] 7  
Interest Income Recognized      
With an allowance recorded 0 [1] 0 0 [2]
Total 0 [1] 0  
Cash Basis Interest Income Recognized      
With an allowance recorded 0 [1] 0 0 [2]
Total 0 [1] 0  
Commercial business loans      
Recorded Investment      
With no related allowance recorded 200 200  
With an allowance recorded 549 549  
Total: 749 749 170
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 208 208  
With an allowance recorded 549 549  
Total: 757 757 170
Related Allowance 214 214 63
Average Recorded Investment      
With no related allowance recorded 203 [1] 130  
With an allowance recorded 430 304  
Total 633 [1] 434 141 [2]
Interest Income Recognized      
With no related allowance recorded 18 [1] 20  
With an allowance recorded 0 [1] 25  
Total 18 [1] 45 0 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 18 [1] 20  
With an allowance recorded 0 [1] 25  
Total $ 18 [1] $ 45 $ 0 [2]
[1] For the three months ended June 30, 2019
[2] For the year ended September 30, 2018.