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Loans Receivable And Allowance For Loan Losses: Impaired Financing Receivables (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Recorded Investment    
With no related allowance recorded $ 3,950 $ 3,949
With an allowance recorded 581 323
Total: 4,531 4,272
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With no related allowance recorded 4,175 4,200
With an allowance recorded 581 323
Total: 4,756 4,523
Related Allowance 137 97
Average Recorded Investment    
With no related allowance recorded 3,950 4,304 [1]
With an allowance recorded 453 1,603 [1]
Total 4,403 5,907 [1]
Interest Income Recognized    
With no related allowance recorded 58 215 [1]
With an allowance recorded 0 53 [1]
Total 58 268 [1]
Cash Basis Interest Income Recognized    
With no related allowance recorded 47 175 [1]
With an allowance recorded 0 42 [1]
Total 47 217 [1]
Mortgage loans, one-to-four family    
Recorded Investment    
With no related allowance recorded 1,014 1,054
With an allowance recorded   0
Total: 1,014 1,054
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With no related allowance recorded 1,161 1,200
With an allowance recorded   0
Total: 1,161 1,200
Related Allowance 0 0
Average Recorded Investment    
With no related allowance recorded 1,034 1,422 [1]
With an allowance recorded [1]   9
Total 1,034 1,431 [1]
Interest Income Recognized    
With no related allowance recorded 18 80 [1]
With an allowance recorded [1]   0
Total 18 80 [1]
Cash Basis Interest Income Recognized    
With no related allowance recorded 16 69 [1]
With an allowance recorded [1]   0
Total 16 69 [1]
Mortgage loans, commercial    
Recorded Investment    
With no related allowance recorded 2,436 2,446
With an allowance recorded   0
Total: 2,436 2,446
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With no related allowance recorded 2,436 2,446
With an allowance recorded   0
Total: 2,436 2,446
Related Allowance 0 0
Average Recorded Investment    
With no related allowance recorded 2,441 2,389 [1]
With an allowance recorded [1]   760
Total 2,441 3,149 [1]
Interest Income Recognized    
With no related allowance recorded 40 121 [1]
With an allowance recorded [1]   28
Total 40 149 [1]
Cash Basis Interest Income Recognized    
With no related allowance recorded 31 93 [1]
With an allowance recorded [1]   21
Total 31 114 [1]
Mortgage loans, land    
Recorded Investment    
With no related allowance recorded 0 90
With an allowance recorded 396 153
Total: 396 243
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With no related allowance recorded 78 195
With an allowance recorded 396 153
Total: 474 348
Related Allowance 79 34
Average Recorded Investment    
With no related allowance recorded 45 283 [1]
With an allowance recorded 198 383 [1]
Total 243 666 [1]
Interest Income Recognized    
With no related allowance recorded 0 11 [1]
With an allowance recorded 0 9 [1]
Total 0 20 [1]
Cash Basis Interest Income Recognized    
With no related allowance recorded 0 10 [1]
With an allowance recorded 0 8 [1]
Total 0 18 [1]
Consumer loans, home equity and second mortgage    
Recorded Investment    
With no related allowance recorded 386 359
With an allowance recorded 0 0
Total: 386 359
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With no related allowance recorded 386 359
With an allowance recorded 0 0
Total: 386 359
Related Allowance 0 0
Average Recorded Investment    
With no related allowance recorded 373 210 [1]
With an allowance recorded 77 310 [1]
Total 450 520 [1]
Interest Income Recognized    
With no related allowance recorded 0 3 [1]
With an allowance recorded 0 16 [1]
Total 0 19 [1]
Cash Basis Interest Income Recognized    
With no related allowance recorded 0 3 [1]
With an allowance recorded 0 13 [1]
Total 0 16 [1]
Consumer loans, other    
Recorded Investment    
With an allowance recorded   170
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With an allowance recorded   170
Related Allowance   63
Average Recorded Investment    
With an allowance recorded [1]   141
Interest Income Recognized    
With an allowance recorded [1]   0
Cash Basis Interest Income Recognized    
With an allowance recorded [1]   0
Commercial business loans    
Recorded Investment    
With no related allowance recorded 114  
With an allowance recorded 185  
Total: 299 170
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With no related allowance recorded 114  
With an allowance recorded 185  
Total: 299 170
Related Allowance 58 63
Average Recorded Investment    
With no related allowance recorded 57  
With an allowance recorded 178  
Total 235 141 [1]
Interest Income Recognized    
With no related allowance recorded 0  
With an allowance recorded 0  
Total 0 0 [1]
Cash Basis Interest Income Recognized    
With no related allowance recorded 0  
With an allowance recorded 0  
Total $ 0 $ 0 [1]
[1] For the year ended September 30, 2018.