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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Held to maturity
Amortized Cost	$ 7,244	$ 7,511
Gross Unrealized Gains	679	887
Gross Unrealized Losses	(11)	(3)
Estimated Fair Value	7,912	8,395
Available for sale
Amortized Cost	1,288	1,336
Gross Unrealized Gains	21	30
Gross Unrealized Losses	(49)	(24)
Estimated Fair Value	1,260	1,342
Mortgage-backed Securities, U.S. government agencies
Held to maturity
Amortized Cost	565	670
Gross Unrealized Gains	12	18
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value	576	687
Available for sale
Amortized Cost	288	336
Gross Unrealized Gains	21	30
Gross Unrealized Losses	0	0
Estimated Fair Value	309	366
Mortgage-backed Securities, Private label residential
Held to maturity
Amortized Cost	671	835
Gross Unrealized Gains	651	762
Gross Unrealized Losses	(4)	(2)
Estimated Fair Value	1,318	1,595
U.S. Treasury and U.S government agency securities
Held to maturity
Amortized Cost	6,008	6,006
Gross Unrealized Gains	16	107
Gross Unrealized Losses	(6)	0
Estimated Fair Value	6,018	6,113
Mutual funds
Available for sale
Amortized Cost	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(49)	(24)
Estimated Fair Value	$ 951	$ 976

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