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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, 2020
Mar. 31, 2020
Sep. 30, 2019
Recorded Investment      
With no related allowance recorded $ 5,073 $ 5,073 $ 5,237
With an allowance recorded 1,020 1,020 700
Total: 6,093 6,093 5,937
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 5,288 5,288 5,446
With an allowance recorded 1,020 1,020 700
Total: 6,308 6,308 6,146
Related Allowance 89 89 172
Average Recorded Investment      
With no related allowance recorded 5,235 [1] 5,235 4,731
With an allowance recorded 796 [1] 764 606
Total 6,031 [1] 5,999 5,337
Interest Income Recognized      
With no related allowance recorded 72 [1] 130 331 [1]
With an allowance recorded 0 [1] 0 30
Total 72 [1] 130 361
Cash Basis Interest Income Recognized      
With no related allowance recorded 60 [1] 96 287
With an allowance recorded 0 [1] 0 30
Total 60 [1] 96 317
Mortgage loans, one-to-four family      
Recorded Investment      
With no related allowance recorded 941 941 1,192
With an allowance recorded 485 485  
Total: 1,426 1,426 1,192
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 984 984 1,236
With an allowance recorded 485 485  
Total: 1,469 1,469 1,236
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 1,186 [1] 1,188 1,110
With an allowance recorded 243 [1] 162  
Total 1,429 [1] 1,350 1,110
Interest Income Recognized      
With no related allowance recorded 20 [1] 25 71 [1]
With an allowance recorded 0 [1] 0  
Total 20 [1] 25 71
Cash Basis Interest Income Recognized      
With no related allowance recorded 18 [1] 23 62
With an allowance recorded 0 [1] 0  
Total 18 [1] 23 62
Mortgage loans, commercial      
Recorded Investment      
With no related allowance recorded 3,339 3,339 3,190
Total: 3,339 3,339 3,190
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 3,339 3,339 3,190
Total: 3,339 3,339 3,190
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 3,240 [1] 3,223 2,920
Total 3,240 [1] 3,223 2,920
Interest Income Recognized      
With no related allowance recorded 52 [1] 105 227 [1]
Total 52 [1] 105 227
Cash Basis Interest Income Recognized      
With no related allowance recorded 42 [1] 73 192
Total 42 [1] 73 192
Mortgage loans, land      
Recorded Investment      
With no related allowance recorded 57 57 63
With an allowance recorded 136 136 141
Total: 193 193 204
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 111 111 126
With an allowance recorded 136 136 141
Total: 247 247 267
Related Allowance 25 25 27
Average Recorded Investment      
With no related allowance recorded 58 [1] 60 100
With an allowance recorded 138 [1] 139 246
Total 196 [1] 199 346
Interest Income Recognized      
With no related allowance recorded 0 [1] 0 3 [1]
With an allowance recorded 0 [1] 0 0
Total 0 [1] 0 3
Cash Basis Interest Income Recognized      
With no related allowance recorded 0 [1] 0 3
With an allowance recorded 0 [1] 0 0
Total 0 [1] 0 3
Consumer loans, home equity and second mortgage      
Recorded Investment      
With no related allowance recorded 581 581 603
Total: 581 581 603
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 581 581 603
Total: 581 581 603
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 581 [1] 588 459
Total 581 [1] 588 459
Interest Income Recognized      
With no related allowance recorded 0 [1] 0 0 [1]
Total 0 [1] 0 0
Cash Basis Interest Income Recognized      
With no related allowance recorded 0 [1] 0 0
Total 0 [1] 0 0
Consumer loans, other      
Recorded Investment      
With no related allowance recorded 11 11  
With an allowance recorded 0 0 23
Total: 11 11 23
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 11 11  
With an allowance recorded 0 0 23
Total: 11 11 23
Related Allowance 0 0 17
Average Recorded Investment      
With no related allowance recorded 6 [1] 4  
With an allowance recorded 6 [1] 12 10
Total 12 [1] 16 10
Interest Income Recognized      
With no related allowance recorded 0 [1] 0  
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  
With an allowance recorded 0 [1] 0  
Total 0 [1] 0 0
Commercial business loans      
Recorded Investment      
With no related allowance recorded 144 144 189
With an allowance recorded 399 399 536
Total: 543 543 725
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 262 262 291
With an allowance recorded 399 399 536
Total: 661 661 827
Related Allowance 64 64 128
Average Recorded Investment      
With no related allowance recorded 164 [1] 172 142
With an allowance recorded 409 451 350
Total 573 [1] 623 492
Interest Income Recognized      
With no related allowance recorded 0 [1] 0 30 [1]
With an allowance recorded 0 [1] 0 30
Total 0 [1] 0 60
Cash Basis Interest Income Recognized      
With no related allowance recorded 0 [1] 0 30
With an allowance recorded 0 [1] 0 30
Total $ 0 [1] $ 0 $ 60
[1] For the three months ended March 31, 2020