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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	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Mar. 31, 2015
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 259		$ 97
Allowance for Loan Losses, Collectively Evaluated for Impairment	9,372		9,433
Allowance for Loan Losses, Total	9,631	$ 9,741	9,530	$ 9,532	$ 9,544	$ 9,553
Recorded Investment in Loans, Individually Evaluated for Impairment	6,266		4,272
Recorded Investment in Loans, Collectively Evaluated for Impairment	880,185		733,286
Loans receivable	886,451		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	1,118		1,086
Allowance for Loan Losses, Total	1,118	1,154	1,086	1,027	1,060	1,082
Recorded Investment in Loans, Individually Evaluated for Impairment	1,220		1,054
Recorded Investment in Loans, Collectively Evaluated for Impairment	127,830		114,887
Loans receivable	129,050		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	438		433
Allowance for Loan Losses, Total	438	470	433	407	386	447
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	70,374		61,928
Loans receivable	70,374		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	4,052		4,248
Allowance for Loan Losses, Total	4,052	4,122	4,248	4,183	4,198	4,184
Recorded Investment in Loans, Individually Evaluated for Impairment	3,255		2,446
Recorded Investment in Loans, Collectively Evaluated for Impairment	415,523		342,667
Loans receivable	418,778		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	702		671
Allowance for Loan Losses, Total	702	666	671	667	705	699
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	70,237		67,024
Loans receivable	70,237		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	221		178
Allowance for Loan Losses, Total	221	249	178	133	99	128
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	10,545		7,107
Loans receivable	10,545		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	384		563
Allowance for Loan Losses, Total	384	384	563	519	445	303
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	27,567		23,440
Loans receivable	27,567		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	367		135
Allowance for Loan Losses, Total	367	272	135	147	284	173
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	18,418		5,983
Loans receivable	18,418		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	126		49
Allowance for Loan Losses, Total	126	244	49	80	48		$ 0
Recorded Investment in Loans, Individually Evaluated for Impairment	0		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,990		1,567
Loans receivable	2,990		1,567
Mortgage loans, land
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	37		34
Allowance for Loan Losses, Collectively Evaluated for Impairment	619		810
Allowance for Loan Losses, Total	656	649	844	744	691	918
Recorded Investment in Loans, Individually Evaluated for Impairment	422		243
Recorded Investment in Loans, Collectively Evaluated for Impairment	26,231		25,303
Loans receivable	26,653		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	645		649
Allowance for Loan Losses, Total	645	667	649	946	945	983
Recorded Investment in Loans, Individually Evaluated for Impairment	606		359
Recorded Investment in Loans, Collectively Evaluated for Impairment	41,598		36,982
Loans receivable	42,204		37,341
Consumer loans, other
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	8		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	79		117
Allowance for Loan Losses, Total	87	112	117	121	120	121
Recorded Investment in Loans, Individually Evaluated for Impairment	14		0
Recorded Investment in Loans, Collectively Evaluated for Impairment	4,436		3,515
Loans receivable	4,450		3,515
Commercial business loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	214		63
Allowance for Loan Losses, Collectively Evaluated for Impairment	621		494
Allowance for Loan Losses, Total	835	$ 752	557	$ 558	$ 563	$ 515
Recorded Investment in Loans, Individually Evaluated for Impairment	749		170
Recorded Investment in Loans, Collectively Evaluated for Impairment	64,436		42,883
Loans receivable	$ 65,185		$ 43,053

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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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