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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, 2017
Mar. 31, 2017
Sep. 30, 2016
Recorded Investment      
With no related allowance recorded $ 3,982 $ 3,982 $ 9,942
With an allowance recorded 6,106 6,106 6,295
Total: 10,088 10,088 16,237
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 5,502 5,502 11,806
With an allowance recorded 6,106 6,106 6,295
Total: 11,608 11,608 18,101
Related Allowance 446 446 776
Average Recorded Investment      
With no related allowance recorded 6,701 [1] 7,781 10,476 [2]
With an allowance recorded 6,161 [1] 6,204 8,103 [2]
Total 12,862 [1] 13,985 18,579 [2]
Interest Income Recognized      
With no related allowance recorded 68 [1] 202 475 [2]
With an allowance recorded 91 [1] 203 478 [2]
Total 159 [1] 405 953 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 53 [1] 161 380 [2]
With an allowance recorded 74 [1] 164 378 [2]
Total 127 [1] 325 758 [2]
Mortgage loans, one-to-four family      
Recorded Investment      
With no related allowance recorded 867 867 914
With an allowance recorded 912 912 1,350
Total: 1,779 1,779 2,264
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 1,013 1,013 1,060
With an allowance recorded 912 912 1,350
Total: 1,925 1,925 2,410
Related Allowance 1 1 70
Average Recorded Investment      
With no related allowance recorded 880 [1] 891 1,349 [2]
With an allowance recorded 1,105 [1] 1,186 1,921 [2]
Total 1,985 [1] 2,077 3,270 [2]
Interest Income Recognized      
With no related allowance recorded 12 [1] 23 38 [2]
With an allowance recorded 23 [1] 49 118 [2]
Total 35 [1] 72 156 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 12 [1] 23 38 [2]
With an allowance recorded 18 [1] 38 89 [2]
Total 30 [1] 61 127 [2]
Mortgage loans, multi-family      
Recorded Investment      
With no related allowance recorded     0
With an allowance recorded     0
Total:     0
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded     0
With an allowance recorded     0
Total:     0
Related Allowance     0
Average Recorded Investment      
With no related allowance recorded [2]     152
With an allowance recorded [2]     655
Total [2]     807
Interest Income Recognized      
With no related allowance recorded [2]     0
With an allowance recorded [2]     0
Total [2]     0
Cash Basis Interest Income Recognized      
With no related allowance recorded [2]     0
With an allowance recorded [2]     0
Total [2]     0
Mortgage loans, commercial      
Recorded Investment      
With no related allowance recorded 2,240 2,240 7,566
With an allowance recorded 4,012 4,012 3,743
Total: 6,252 6,252 11,309
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 3,301 3,301 8,685
With an allowance recorded 4,012 4,012 3,743
Total: 7,313 7,313 12,428
Related Allowance 108 108 413
Average Recorded Investment      
With no related allowance recorded 4,566 [1] 5,566 7,784 [2]
With an allowance recorded 3,868 [1] 3,826 4,181 [2]
Total 8,434 [1] 9,392 11,965 [2]
Interest Income Recognized      
With no related allowance recorded 52 [1] 164 421 [2]
With an allowance recorded 49 [1] 115 275 [2]
Total 101 [1] 279 696 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 38 [1] 125 330 [2]
With an allowance recorded 39 [1] 93 215 [2]
Total 77 [1] 218 545 [2]
Mortgage loans, construction - custom and owner/builder      
Recorded Investment      
With no related allowance recorded 0 0 367
Total: 0 0 367
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 0 0 367
Total: 0 0 367
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 184 [1] 245 73 [2]
Total 184 [1] 245 73 [2]
Interest Income Recognized      
With no related allowance recorded 0 [1] 7 0 [2]
Total 0 [1] 7 0 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 0 [1] 7 0 [2]
Total 0 [1] 7 0 [2]
Mortgage loans, land      
Recorded Investment      
With no related allowance recorded 438 438 693
With an allowance recorded 563 563 575
Total: 1,001 1,001 1,268
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 560 560 1,101
With an allowance recorded 563 563 575
Total: 1,123 1,123 1,676
Related Allowance 13 13 53
Average Recorded Investment      
With no related allowance recorded 659 [1] 670 839 [2]
With an allowance recorded 566 [1] 569 604 [2]
Total 1,225 [1] 1,239 1,443 [2]
Interest Income Recognized      
With no related allowance recorded 4 [1] 8 16 [2]
With an allowance recorded 9 [1] 19 39 [2]
Total 13 [1] 27 55 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 3 [1] 6 12 [2]
With an allowance recorded 8 [1] 15 32 [2]
Total 11 [1] 21 44 [2]
Consumer loans, home equity and second mortgage      
Recorded Investment      
With no related allowance recorded 383 383 402
With an allowance recorded 591 591 597
Total: 974 974 999
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 574 574 593
With an allowance recorded 591 591 597
Total: 1,165 1,165 1,190
Related Allowance 307 307 227
Average Recorded Investment      
With no related allowance recorded 385 [1] 391 264 [2]
With an allowance recorded 593 [1] 594 709 [2]
Total 978 [1] 985 973 [2]
Interest Income Recognized      
With no related allowance recorded 0 [1] 0 0 [2]
With an allowance recorded 10 [1] 20 44 [2]
Total 10 [1] 20 44 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 0 [1] 0 0 [2]
With an allowance recorded 9 [1] 18 40 [2]
Total 9 [1] 18 40 [2]
Consumer loans, other      
Recorded Investment      
With an allowance recorded 28 28 30
Total: 28 28 30
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With an allowance recorded 28 28 30
Total: 28 28 30
Related Allowance 17 17 13
Average Recorded Investment      
With an allowance recorded 29 [1] 29 33 [2]
Total 29 [1] 29 33 [2]
Interest Income Recognized      
With an allowance recorded 0 [1] 0 2 [2]
Total 0 [1] 0 2 [2]
Cash Basis Interest Income Recognized      
With an allowance recorded 0 [1] 0 2 [2]
Total 0 [1] 0 2 [2]
Commercial business loans      
Recorded Investment      
With no related allowance recorded 54 54 0
Total: 54 54 0
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 54 54 0
Total: 54 54 0
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 27 [1] 18 15 [2]
Total 27 [1] 18 15 [2]
Interest Income Recognized      
With no related allowance recorded 0 [1] 0 0 [2]
Total 0 [1] 0 0 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 0 [1] 0 0 [2]
Total $ 0 [1] $ 0 $ 0 [2]
[1] For the three months ended March 31, 2017.
[2] For the year ended September 30, 2016.