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Loans Receivable And Allowance For Loan Losses: Past Due Status of Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Sep. 30, 2019
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		$ 3,872	$ 3,925
Loans receivable, Non-Accrual	[1]	3,070	3,033
Loans receivable, Current		921,994	895,225
Loans receivable		925,866	899,150
Mortgage loans, one-to-four family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		1,219	985
Loans receivable, Non-Accrual	[1]	942	699
Loans receivable, Current		128,154	131,676
Loans receivable		129,373	132,661
Mortgage loans, multi-family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		78,326	76,036
Loans receivable		78,326	76,036
Mortgage loans, commercial
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		953	1,091
Loans receivable, Non-Accrual	[1]	736	779
Loans receivable, Current		438,071	418,026
Loans receivable		439,024	419,117
Mortgage loans, construction - custom and owner/builder
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		75,026	75,411
Loans receivable		75,026	75,411
Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		12,473	10,779
Loans receivable		12,473	10,779
Mortgage loans, construction – commercial
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		27,151	24,051
Loans receivable		27,151	24,051
Mortgage loans, construction - Multi-family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		17,024	19,256
Loans receivable		17,024	19,256
Mortgage loans, construction - Land development
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Loans receivable, Non-Accrual	[1]	0	0
Loans receivable, Current		1,064	1,803
Loans receivable		1,064	1,803
Mortgage loans, land
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		478	402
Loans receivable, Non-Accrual	[1]	198	204
Loans receivable, Current		28,941	30,368
Loans receivable		29,419	30,770
Consumer loans, home equity and second mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		609	697
Loans receivable, Non-Accrual	[1]	581	603
Loans receivable, Current		38,494	39,493
Loans receivable		39,103	40,190
Consumer loans, other
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		12	23
Loans receivable, Non-Accrual	[1]	12	23
Loans receivable, Current		4,081	4,289
Loans receivable		4,093	4,312
Commercial business loans
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		601	727
Loans receivable, Non-Accrual	[1]	601	725
Loans receivable, Current		73,189	64,037
Loans receivable		73,790	64,764
30 to 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		93	193
30 to 59 Days Past Due | Mortgage loans, one-to-four family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Mortgage loans, multi-family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Mortgage loans, commercial
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	94
30 to 59 Days Past Due | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Mortgage loans, construction – commercial
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Mortgage loans, construction - Multi-family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Mortgage loans, construction - Land development
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Mortgage loans, land
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		65	5
30 to 59 Days Past Due | Consumer loans, home equity and second mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		28	94
30 to 59 Days Past Due | Consumer loans, other
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
30 to 59 Days Past Due | Commercial business loans
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		709	699
60 to 89 Days Past Due | Mortgage loans, one-to-four family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		277	286
60 to 89 Days Past Due | Mortgage loans, multi-family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Mortgage loans, commercial
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		217	218
60 to 89 Days Past Due | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Mortgage loans, construction – commercial
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Mortgage loans, construction - Multi-family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Mortgage loans, construction - Land development
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Mortgage loans, land
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		215	193
60 to 89 Days Past Due | Consumer loans, home equity and second mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Consumer loans, other
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
60 to 89 Days Past Due | Commercial business loans
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	2
Past Due 90 Days or More and Still Accruing
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, one-to-four family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, multi-family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, commercial
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - custom and owner/builder
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - speculative one-to-four family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction – commercial
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - Multi-family
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, construction - Land development
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Mortgage loans, land
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Consumer loans, home equity and second mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Consumer loans, other
Financing Receivable, Past Due [Line Items]
Loans receivable, Total Past Due		0	0
Past Due 90 Days or More and Still Accruing | Commercial business loans
Financing Receivable, 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.

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