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Loans Receivable and Allowance for Loan Losses: Schedule of Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | $ 9,826 | $ 9,924 | $ 10,427
Provision for (Recapture of) Loan Losses | (1,250) | 0 | (1,525)
Charge-offs | (133) | (368) | (424)
Recoveries | 1,110 | 270 | 1,446
Allowance for loan losses, Ending Allowance | 9,553 | 9,826 | 9,924
Mortgage loans, one-to-four family |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 1,239 | 1,480 | 1,650
Provision for (Recapture of) Loan Losses | (178) | (225) | (214)
Charge-offs | 0 | (72) | (220)
Recoveries | 21 | 56 | 264
Allowance for loan losses, Ending Allowance | 1,082 | 1,239 | 1,480
Mortgage loans, multi-family |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 473 | 392 | 387
Provision for (Recapture of) Loan Losses | (26) | 81 | 2
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 3
Allowance for loan losses, Ending Allowance | 447 | 473 | 392
Mortgage loans, commercial |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 4,384 | 4,065 | 4,836
Provision for (Recapture of) Loan Losses | (1,248) | 528 | (775)
Charge-offs | (13) | (209) | 0
Recoveries | 1,061 | 0 | 4
Allowance for loan losses, Ending Allowance | 4,184 | 4,384 | 4,065
Mortgage loans, construction - custom and owner/builder |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 619 | 451 | 450
Provision for (Recapture of) Loan Losses | 80 | 168 | 1
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 699 | 619 | 451
Mortgage loans, construction - speculative one-to-four family |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 130 | 123 | 52
Provision for (Recapture of) Loan Losses | (8) | 5 | 69
Charge-offs | 0 | 0 | 0
Recoveries | 6 | 2 | 2
Allowance for loan losses, Ending Allowance | 128 | 130 | 123
Mortgage loans, construction - commercial |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 268 | 426 | 78
Provision for (Recapture of) Loan Losses | 35 | (158) | 348
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 | 0
Allowance for loan losses, Ending Allowance | 303 | 268 | 426
Mortgage loans, construction - multi-family |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 316 | 283 | 25
Provision for (Recapture of) Loan Losses | (143) | (148) | (867)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 181 | 1,125
Allowance for loan losses, Ending Allowance | 173 | 316 | 283
Mortgage loans, land |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 820 | 1,021 | 1,434
Provision for (Recapture of) Loan Losses | 189 | (164) | (305)
Charge-offs | (110) | (61) | (145)
Recoveries | 19 | 24 | 37
Allowance for loan losses, Ending Allowance | 918 | 820 | 1,021
Consumer loans, home equity and second mortgage |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 939 | 1,073 | 879
Provision for (Recapture of) Loan Losses | 44 | (116) | 242
Charge-offs | 0 | (18) | (50)
Recoveries | 0 | 0 | 2
Allowance for loan losses, Ending Allowance | 983 | 939 | 1,073
Consumer loans, other |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 156 | 187 | 176
Provision for (Recapture of) Loan Losses | (28) | (25) | 16
Charge-offs | (10) | (8) | (9)
Recoveries | 3 | 2 | 4
Allowance for loan losses, Ending Allowance | 121 | 156 | 187
Commercial business loans |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Allowance for loan losses, Beginning Allowance | 482 | 423 | 460
Provision for (Recapture of) Loan Losses | 33 | 54 | (42)
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 5 | 5
Allowance for loan losses, Ending Allowance | $ 515 | $ 482 | $ 423

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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