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Loans Receivable and Allowance for Loan Losses: Past Due Status of Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due $ 2,413 $ 3,471
Loans receivable, Non-Accrual 1,911 [1] 2,873 [2]
Loans receivable, Current 699,970 671,730
Loans receivable 702,383 675,201
30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 395 218
60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 107 245
Past Due 90 Days or More and Still Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 135
Mortgage loans, one-to-four family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 1,067 1,121
Loans receivable, Non-Accrual 874 [1] 914 [2]
Loans receivable, Current 117,080 117,439
Loans receivable 118,147 118,560
Mortgage loans, one-to-four family | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 193 0
Mortgage loans, one-to-four family | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 207
Mortgage loans, one-to-four family | Past Due 90 Days or More and Still Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, multi-family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Loans receivable, Non-Accrual 0 [1] 0 [2]
Loans receivable, Current 58,607 62,303
Loans receivable 58,607 62,303
Mortgage loans, multi-family | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, multi-family | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, multi-family | Past Due 90 Days or More and Still Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 320 725
Loans receivable, Non-Accrual 213 [1] 612 [2]
Loans receivable, Current 328,607 311,800
Loans receivable 328,927 312,525
Mortgage loans, commercial | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 113
Mortgage loans, commercial | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 107 0
Mortgage loans, commercial | Past Due 90 Days or More and Still Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, construction - custom and owner/builder    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 367
Loans receivable, Non-Accrual 0 [1] 367 [2]
Loans receivable, Current 63,538 51,662
Loans receivable 63,538 52,029
Mortgage loans, construction - custom and owner/builder | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, construction - custom and owner/builder | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, construction - custom and owner/builder | Past Due 90 Days or More and Still Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, construction - speculative one-to-four family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Loans receivable, Non-Accrual 0 [1] 0 [2]
Loans receivable, Current 4,639 4,074
Loans receivable 4,639 4,074
Mortgage loans, construction - speculative one-to-four family | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, construction - speculative one-to-four family | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, construction - speculative one-to-four family | Past Due 90 Days or More and Still Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, construction - commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Loans receivable, Non-Accrual 0 [1] 0 [2]
Loans receivable, Current 11,016 6,841
Loans receivable 11,016 6,841
Mortgage loans, construction - commercial | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, construction - commercial | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, construction - commercial | Past Due 90 Days or More and Still Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, construction - multi-family    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Loans receivable, Non-Accrual 0 [1] 0 [2]
Loans receivable, Current 6,912 11,539
Loans receivable 6,912 11,539
Mortgage loans, construction - multi-family | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, construction - multi-family | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, construction - multi-family | Past Due 90 Days or More and Still Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, land    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 566 548
Loans receivable, Non-Accrual 566 [1] 548 [2]
Loans receivable, Current 23,344 21,079
Loans receivable 23,910 21,627
Mortgage loans, land | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, land | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Mortgage loans, land | Past Due 90 Days or More and Still Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Consumer loans, home equity and second mortgage    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 314 574
Loans receivable, Non-Accrual 258 [1] 402 [2]
Loans receivable, Current 38,106 39,153
Loans receivable 38,420 39,727
Consumer loans, home equity and second mortgage | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 56 37
Consumer loans, home equity and second mortgage | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Consumer loans, home equity and second mortgage | Past Due 90 Days or More and Still Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 135
Consumer loans, other    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 36 61
Loans receivable, Non-Accrual 0 [1] 30 [2]
Loans receivable, Current 3,787 4,078
Loans receivable 3,823 4,139
Consumer loans, other | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 36 31
Consumer loans, other | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Consumer loans, other | Past Due 90 Days or More and Still Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 0
Commercial business loans    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 110 75
Loans receivable, Non-Accrual 0 [1] 0 [2]
Loans receivable, Current 44,334 41,762
Loans receivable 44,444 41,837
Commercial business loans | 30-59 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 110 37
Commercial business loans | 60-89 Days Past Due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due 0 38
Commercial business loans | Past Due 90 Days or More and Still Accruing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans receivable, Total Past Due $ 0 $ 0
[1] Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.
[2] Includes non-accrual loans past due 90 days or more and other loans classified as non-accrual.