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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, 2017
Sep. 30, 2017
Recorded Investment    
With no related allowance recorded $ 3,807 $ 3,830
With an allowance recorded 3,313 3,162
Total: 7,120 6,992
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With no related allowance recorded 4,049 4,089
With an allowance recorded 3,313 3,221
Total: 7,362 7,310
Related Allowance 435 476
Average Recorded Investment    
With no related allowance recorded 3,819 5,963 [1]
With an allowance recorded 3,239 5,260 [1]
Total 7,058 11,223 [1]
Interest Income Recognized    
With no related allowance recorded 45 271 [1]
With an allowance recorded 42 296 [1]
Total 87 567 [1]
Cash Basis Interest Income Recognized    
With no related allowance recorded 35 218 [1]
With an allowance recorded 34 237 [1]
Total 69 455 [1]
Mortgage loans, one-to-four family    
Recorded Investment    
With no related allowance recorded 1,423 1,443
With an allowance recorded 44 0
Total: 1,467 1,443
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With no related allowance recorded 1,569 1,589
With an allowance recorded 44 0
Total: 1,613 1,589
Related Allowance 1 0
Average Recorded Investment    
With no related allowance recorded 1,433 1,108 [1]
With an allowance recorded 22 721 [1]
Total 1,455 1,829 [1]
Interest Income Recognized    
With no related allowance recorded 19 68 [1]
With an allowance recorded 0 50 [1]
Total 19 118 [1]
Cash Basis Interest Income Recognized    
With no related allowance recorded 16 62 [1]
With an allowance recorded 0 38 [1]
Total 16 100 [1]
Mortgage loans, commercial    
Recorded Investment    
With no related allowance recorded 2,151 1,967
With an allowance recorded 1,893 1,906
Total: 4,044 3,873
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With no related allowance recorded 2,151 1,967
With an allowance recorded 1,893 1,906
Total: 4,044 3,873
Related Allowance 16 26
Average Recorded Investment    
With no related allowance recorded 2,059 3,901 [1]
With an allowance recorded 1,900 3,326 [1]
Total 3,959 7,227 [1]
Interest Income Recognized    
With no related allowance recorded 24 188 [1]
With an allowance recorded 27 182 [1]
Total 51 370 [1]
Cash Basis Interest Income Recognized    
With no related allowance recorded 17 143 [1]
With an allowance recorded 21 144 [1]
Total 38 287 [1]
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 [1]   147
Total [1]   147
Interest Income Recognized    
With no related allowance recorded [1]   7
Total [1]   7
Cash Basis Interest Income Recognized    
With no related allowance recorded [1]   7
Total [1]   7
Mortgage loans, land    
Recorded Investment    
With no related allowance recorded 45 297
With an allowance recorded 899 822
Total: 944 1,119
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With no related allowance recorded 141 410
With an allowance recorded 899 881
Total: 1,040 1,291
Related Allowance 72 125
Average Recorded Investment    
With no related allowance recorded 171 512 [1]
With an allowance recorded 861 666 [1]
Total 1,032 1,178 [1]
Interest Income Recognized    
With no related allowance recorded 0 8 [1]
With an allowance recorded 9 35 [1]
Total 9 43 [1]
Cash Basis Interest Income Recognized    
With no related allowance recorded 0 6 [1]
With an allowance recorded 8 29 [1]
Total 8 35 [1]
Consumer loans, home equity and second mortgage    
Recorded Investment    
With no related allowance recorded 188 123
With an allowance recorded 296 434
Total: 484 557
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With no related allowance recorded 188 123
With an allowance recorded 296 434
Total: 484 557
Related Allowance 291 325
Average Recorded Investment    
With no related allowance recorded 156 284 [1]
With an allowance recorded 365 530 [1]
Total 521 814 [1]
Interest Income Recognized    
With no related allowance recorded 2 0 [1]
With an allowance recorded 6 29 [1]
Total 8 29 [1]
Cash Basis Interest Income Recognized    
With no related allowance recorded 2 0 [1]
With an allowance recorded 5 26 [1]
Total 7 26 [1]
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 [1]   17
Total [1]   17
Interest Income Recognized    
With an allowance recorded [1]   0
Total [1]   0
Cash Basis Interest Income Recognized    
With an allowance recorded [1]   0
Total [1]   0
Commercial business loans    
Recorded Investment    
With no related allowance recorded   0
With an allowance recorded 181  
Total: 181 0
Unpaid Principal Balance (Loan Balance Plus Charge Off)    
With no related allowance recorded   0
With an allowance recorded 181  
Total: 181 0
Related Allowance 55 0
Average Recorded Investment    
With no related allowance recorded [1]   11
With an allowance recorded 91  
Total 91 11 [1]
Interest Income Recognized    
With no related allowance recorded [1]   0
With an allowance recorded 0  
Total 0 0 [1]
Cash Basis Interest Income Recognized    
With no related allowance recorded [1]   0
With an allowance recorded 0  
Total $ 0 $ 0 [1]
[1] For the year ended September 30, 2017.