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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, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 41	$ 172
Allowance for Loan Losses, Collectively Evaluated for Impairment	13,373	9,518
Allowance for Loan Losses, Total	13,414	9,690	$ 9,530	$ 9,553
Recorded Investment in Loans, Individually Evaluated for Impairment	5,773	5,937
Recorded Investment in Loans, Collectively Evaluated for Impairment	1,027,952	893,213
Loans receivable	1,033,725	899,150
Mortgage loans, one-to-four family
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	3	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,160	1,167
Allowance for Loan Losses, Total	1,163	1,167	1,086	1,082
Recorded Investment in Loans, Individually Evaluated for Impairment	1,143	1,192
Recorded Investment in Loans, Collectively Evaluated for Impairment	117,437	131,469
Loans receivable	118,580	132,661
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	718	481
Allowance for Loan Losses, Total	718	481	433	447
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	85,053	76,036
Loans receivable	85,053	76,036
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	7,144	4,154
Allowance for Loan Losses, Total	7,144	4,154	4,248	4,184
Recorded Investment in Loans, Individually Evaluated for Impairment	3,242	3,190
Recorded Investment in Loans, Collectively Evaluated for Impairment	450,332	415,927
Loans receivable	453,574	419,117
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	832	755
Allowance for Loan Losses, Total	832	755	671	699
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	75,332	75,411
Loans receivable	75,332	75,411
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	158	212
Allowance for Loan Losses, Total	158	212	178	128
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	7,108	10,779
Loans receivable	7,108	10,779
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	420	338
Allowance for Loan Losses, Total	420	338	563	303
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	20,927	24,051
Loans receivable	20,927	24,051
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	238	375
Allowance for Loan Losses, Total	238	375	135	173
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	10,832	19,256
Loans receivable	10,832	19,256
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	133	67
Allowance for Loan Losses, Total	133	67	49	0
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	4,739	1,803
Loans receivable	4,739	1,803
Mortgage loans, land
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	27
Allowance for Loan Losses, Collectively Evaluated for Impairment	572	670
Allowance for Loan Losses, Total	572	697	844	918
Recorded Investment in Loans, Individually Evaluated for Impairment	394	204
Recorded Investment in Loans, Collectively Evaluated for Impairment	25,177	30,566
Loans receivable	25,571	30,770
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	593	623
Allowance for Loan Losses, Total	593	623	649	983
Recorded Investment in Loans, Individually Evaluated for Impairment	555	603
Recorded Investment in Loans, Collectively Evaluated for Impairment	31,522	39,587
Loans receivable	32,077	40,190
Consumer loans, other
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0	17
Allowance for Loan Losses, Collectively Evaluated for Impairment	71	82
Allowance for Loan Losses, Total	71	99	117	121
Recorded Investment in Loans, Individually Evaluated for Impairment	9	23
Recorded Investment in Loans, Collectively Evaluated for Impairment	3,563	4,289
Loans receivable	3,572	4,312
Commercial business loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	38	128
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,334	594
Allowance for Loan Losses, Total	1,372	722	$ 557	$ 515
Recorded Investment in Loans, Individually Evaluated for Impairment	430	725
Recorded Investment in Loans, Collectively Evaluated for Impairment	69,110	64,039
Loans receivable	69,540	$ 64,764
SBA PPP Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	0
Allowance for Loan Losses, Total	0
Recorded Investment in Loans, Individually Evaluated for Impairment	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	126,820
Loans receivable	$ 126,820

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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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