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Loans Receivable and Allowance for Loan Losses: Schedule of loans evaluated individually for impairment and collectively evaluated for impairment in the allowance for loan losses (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 172	$ 97
Allowance for Loan Losses, Collectively Evaluated for Impairment	9,518	9,433
Allowance for Loan Losses, Total	9,690	9,530	$ 9,553	$ 9,826
Recorded Investment in Loans, Individually Evaluated for Impairment	5,937	4,272
Recorded Investment in Loans, Collectively Evaluated for Impairment	893,213	733,286
Loans receivable	899,150	737,558
Mortgage loans, one-to-four family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,167	1,086
Allowance for Loan Losses, Total	1,167	1,086	1,082	1,239
Recorded Investment in Loans, Individually Evaluated for Impairment	1,192	1,054
Recorded Investment in Loans, Collectively Evaluated for Impairment	131,469	114,887
Loans receivable	132,661	115,941
Mortgage loans, multi-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	481	433
Allowance for Loan Losses, Total	481	433	447	473
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	76,036	61,928
Loans receivable	76,036	61,928
Mortgage loans, commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	4,154	4,248
Allowance for Loan Losses, Total	4,154	4,248	4,184	4,384
Recorded Investment in Loans, Individually Evaluated for Impairment	3,190	2,446
Recorded Investment in Loans, Collectively Evaluated for Impairment	415,927	342,667
Loans receivable	419,117	345,113
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	755	671
Allowance for Loan Losses, Total	755	671	699	619
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	75,411	67,024
Loans receivable	75,411	67,024
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	212	178
Allowance for Loan Losses, Total	212	178	128	130
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	10,779	7,107
Loans receivable	10,779	7,107
Mortgage loans, construction - commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	338	563
Allowance for Loan Losses, Total	338	563	303	268
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	24,051	23,440
Loans receivable	24,051	23,440
Mortgage loans, construction - multi-family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	375	135
Allowance for Loan Losses, Total	375	135	173	316
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	19,256	5,983
Loans receivable	19,256	5,983
Mortgage loans - construction - land development
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	67	49
Allowance for Loan Losses, Total	67	49	0
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	1,803	1,567
Loans receivable	1,803	1,567
Mortgage loans, land
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	27	34
Allowance for Loan Losses, Collectively Evaluated for Impairment	670	810
Allowance for Loan Losses, Total	697	844	918	820
Recorded Investment in Loans, Individually Evaluated for Impairment	204	243
Recorded Investment in Loans, Collectively Evaluated for Impairment	30,566	25,303
Loans receivable	30,770	25,546
Consumer loans, home equity and second mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	623	649
Allowance for Loan Losses, Total	623	649	983	939
Recorded Investment in Loans, Individually Evaluated for Impairment	603	359
Recorded Investment in Loans, Collectively Evaluated for Impairment	39,587	36,982
Loans receivable	40,190	37,341
Consumer loans, other
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	17	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	82	117
Allowance for Loan Losses, Total	99	117	121	156
Recorded Investment in Loans, Individually Evaluated for Impairment	23	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	4,289	3,515
Loans receivable	4,312	3,515
Commercial business loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	128	63
Allowance for Loan Losses, Collectively Evaluated for Impairment	594	494
Allowance for Loan Losses, Total	722	557	$ 515	$ 482
Recorded Investment in Loans, Individually Evaluated for Impairment	725	170
Recorded Investment in Loans, Collectively Evaluated for Impairment	64,039	42,883
Loans receivable	$ 64,764	$ 43,053

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Loans Receivable, Including Loans Held-For-Sale and Loans in Process, Gross

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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