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Loans Receivable And Allowance For Loan Losses: Impaired Financing Receivables (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Recorded Investment      
With no related allowance recorded $ 2,639 $ 2,639 $ 9,942
With an allowance recorded 4,528 4,528 6,295
Total: 7,167 7,167 16,237
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 2,903 2,903 11,806
With an allowance recorded 4,528 4,528 6,295
Total: 7,431 7,431 18,101
Related Allowance 429 429 776
Average Recorded Investment      
With no related allowance recorded 3,311 [1] 6,496 10,476 [2]
With an allowance recorded 5,318 [1] 5,785 8,103 [2]
Total 8,629 [1] 12,281 18,579 [2]
Interest Income Recognized      
With no related allowance recorded 25 [1] 227 475 [2]
With an allowance recorded 60 [1] 262 478 [2]
Total 85 [1] 489 953 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 22 [1] 183 380 [2]
With an allowance recorded 48 [1] 212 378 [2]
Total 70 [1] 395 758 [2]
Mortgage loans, one-to-four family      
Recorded Investment      
With no related allowance recorded 1,423 1,423 914
With an allowance recorded 46 46 1,350
Total: 1,469 1,469 2,264
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 1,570 1,570 1,060
With an allowance recorded 46 46 1,350
Total: 1,616 1,616 2,410
Related Allowance 0 0 70
Average Recorded Investment      
With no related allowance recorded 1,145 [1] 1,024 1,349 [2]
With an allowance recorded 479 [1] 901 1,921 [2]
Total 1,624 [1] 1,925 3,270 [2]
Interest Income Recognized      
With no related allowance recorded 23 [1] 46 38 [2]
With an allowance recorded 1 [1] 50 118 [2]
Total 24 [1] 96 156 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 20 [1] 43 38 [2]
With an allowance recorded 1 [1] 38 89 [2]
Total 21 [1] 81 127 [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 839 839 7,566
With an allowance recorded 3,245 3,245 3,743
Total: 4,084 4,084 11,309
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 839 839 8,685
With an allowance recorded 3,245 3,245 3,743
Total: 4,084 4,084 12,428
Related Allowance 20 20 413
Average Recorded Investment      
With no related allowance recorded 1,540 [1] 4,384 7,784 [2]
With an allowance recorded 3,629 [1] 3,681 4,181 [2]
Total 5,169 [1] 8,065 11,965 [2]
Interest Income Recognized      
With no related allowance recorded 2 [1] 166 421 [2]
With an allowance recorded 45 [1] 159 275 [2]
Total 47 [1] 325 696 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 2 [1] 127 330 [2]
With an allowance recorded 35 [1] 128 215 [2]
Total 37 [1] 255 545 [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 0 [1] 184 73 [2]
Total 0 [1] 184 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 252 252 693
With an allowance recorded 802 802 575
Total: 1,054 1,054 1,268
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 369 369 1,101
With an allowance recorded 802 802 575
Total: 1,171 1,171 1,676
Related Allowance 89 89 53
Average Recorded Investment      
With no related allowance recorded 345 [1] 566 839 [2]
With an allowance recorded 683 [1] 627 604 [2]
Total 1,028 [1] 1,193 1,443 [2]
Interest Income Recognized      
With no related allowance recorded 0 [1] 8 16 [2]
With an allowance recorded 9 [1] 28 39 [2]
Total 9 [1] 36 55 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 0 [1] 6 12 [2]
With an allowance recorded 7 [1] 23 32 [2]
Total 7 [1] 29 44 [2]
Consumer loans, home equity and second mortgage      
Recorded Investment      
With no related allowance recorded 125 125 402
With an allowance recorded 435 435 597
Total: 560 560 999
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 125 125 593
With an allowance recorded 435 435 597
Total: 560 560 1,190
Related Allowance 320 320 227
Average Recorded Investment      
With no related allowance recorded 254 [1] 324 264 [2]
With an allowance recorded 513 [1] 554 709 [2]
Total 767 [1] 878 973 [2]
Interest Income Recognized      
With no related allowance recorded 0 [1] 0 0 [2]
With an allowance recorded 5 [1] 25 44 [2]
Total 5 [1] 25 44 [2]
Cash Basis Interest Income Recognized      
With no related allowance recorded 0 [1] 0 0 [2]
With an allowance recorded 5 [1] 23 40 [2]
Total 5 [1] 23 40 [2]
Consumer loans, other      
Recorded Investment      
With an allowance recorded 0 0 30
Total: 0 0 30
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With an allowance recorded 0 0 30
Total: 0 0 30
Related Allowance 0 0 13
Average Recorded Investment      
With an allowance recorded 14 [1] 22 33 [2]
Total 14 [1] 22 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 0 0 0
Total: 0 0 0
Unpaid Principal Balance (Loan Balance Plus Charge Off)      
With no related allowance recorded 0 0 0
Total: 0 0 0
Related Allowance 0 0 0
Average Recorded Investment      
With no related allowance recorded 27 [1] 14 15 [2]
Total 27 [1] 14 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 June 30, 2017.
[2] For the year ended September 30, 2016.