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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, 2019
Mar. 31, 2019
Sep. 30, 2018
Recorded Investment      
With no related allowance recorded $ 4,955 $ 4,955 $ 3,949
With an allowance recorded 718 718 323
Total: 5,673 5,673 4,272
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 5,117 5,117 4,200
With an allowance recorded 718 718 323
Total: 5,835 5,835 4,523
Related Allowance 231 231 97
Average Recorded Investment      
With no related allowance recorded 4,454 [1] 4,285 4,304 [2]
With an allowance recorded 651 [1] 541 1,603 [2]
Total 5,105 [1] 4,826 5,907 [2]
Interest Income Recognized      
With no related allowance recorded 59 [1] 117 215 [2]
With an allowance recorded 0 [1] 0 53 [2]
Total 59 [1] 117 268 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 50 [1] 96 175 [2]
With an allowance recorded 0 [1] 0 42 [2]
Total 50 [1] 96 217 [2]
Mortgage loans, one-to-four family      
Recorded Investment      
With no related allowance recorded 1,069 1,069 1,054
With an allowance recorded     0
Total: 1,069 1,069 1,054
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 1,150 1,150 1,200
With an allowance recorded     0
Total: 1,150 1,150 1,200
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 1,042 [1] 1,046 1,422 [2]
With an allowance recorded [2]     9
Total 1,042 [1] 1,046 1,431 [2]
Interest Income Recognized      
With no related allowance recorded 17 [1] 35 80 [2]
With an allowance recorded [2]     0
Total 17 [1] 35 80 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 16 [1] 32 69 [2]
With an allowance recorded [2]     0
Total 16 [1] 32 69 [2]
Mortgage loans, commercial      
Recorded Investment      
With no related allowance recorded 3,271 3,271 2,446
With an allowance recorded     0
Total: 3,271 3,271 2,446
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 3,271 3,271 2,446
With an allowance recorded     0
Total: 3,271 3,271 2,446
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 2,854 [1] 2,718 2,389 [2]
With an allowance recorded [2]     760
Total 2,854 [1] 2,718 3,149 [2]
Interest Income Recognized      
With no related allowance recorded 40 [1] 80 121 [2]
With an allowance recorded [2]     28
Total 40 [1] 80 149 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 32 [1] 62 93 [2]
With an allowance recorded [2]     21
Total 32 [1] 62 114 [2]
Mortgage loans, land      
Recorded Investment      
With no related allowance recorded 68 68 90
With an allowance recorded 393 393 153
Total: 461 461 243
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 141 141 195
With an allowance recorded 393 393 153
Total: 534 534 348
Related Allowance 77 77 34
Average Recorded Investment      
With no related allowance recorded 34 [1] 53 283 [2]
With an allowance recorded 395 [1] 263 383 [2]
Total 429 [1] 316 666 [2]
Interest Income Recognized      
With no related allowance recorded 0 [1] 0 11 [2]
With an allowance recorded 0 [1] 0 9 [2]
Total 0 [1] 0 20 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 0 [1] 0 10 [2]
With an allowance recorded 0 [1] 0 8 [2]
Total 0 [1] 0 18 [2]
Consumer loans, home equity and second mortgage      
Recorded Investment      
With no related allowance recorded 342 342 359
With an allowance recorded 0 0 0
Total: 342 342 359
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 342 342 359
With an allowance recorded 0 0 0
Total: 342 342 359
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 364 [1] 362 210 [2]
With an allowance recorded 0 [1] 51 310 [2]
Total 364 [1] 413 520 [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 15 15 170
Total: 15 15  
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With an allowance recorded 15 15 170
Total: 15 15  
Related Allowance 9 9 63
Average Recorded Investment      
With an allowance recorded 8 [1] 5 141 [2]
Total 8 [1] 5  
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 205 205  
With an allowance recorded 310 310  
Total: 515 515 170
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 213 213  
With an allowance recorded 310 310  
Total: 523 523 170
Related Allowance 145 145 63
Average Recorded Investment      
With no related allowance recorded 160 [1] 106  
With an allowance recorded 248 222  
Total 408 [1] 328 141 [2]
Interest Income Recognized      
With no related allowance recorded 2 [1] 2  
With an allowance recorded 0 [1] 0  
Total 2 [1] 2 0 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 2 [1] 2  
With an allowance recorded 0 [1] 0  
Total $ 2 [1] $ 2 $ 0 [2]
[1] For the three months ended March 31, 2019
[2] For the year ended September 30, 2018.