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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Held to Maturity
Amortized Cost	$ 7,139	$ 7,511
Gross Unrealized Gains	617	887
Gross Unrealized Losses	(12)	(3)
Estimated Fair Value	7,744	8,395
Available for Sale
Amortized Cost	1,271	1,336
Gross Unrealized Gains	18	30
Gross Unrealized Losses	(48)	(24)
Estimated Fair Value	1,241	1,342
Mortgage-backed Securities, U.S. government agencies
Held to Maturity
Amortized Cost	532	670
Gross Unrealized Gains	11	18
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value	542	687
Available for Sale
Amortized Cost	271	336
Gross Unrealized Gains	18	30
Gross Unrealized Losses	0	0
Estimated Fair Value	289	366
Mortgage-backed Securities, Private label residential
Held to Maturity
Amortized Cost	599	835
Gross Unrealized Gains	596	762
Gross Unrealized Losses	(2)	(2)
Estimated Fair Value	1,193	1,595
U.S. agency securities
Held to Maturity
Amortized Cost	6,008	6,006
Gross Unrealized Gains	10	107
Gross Unrealized Losses	(9)	0
Estimated Fair Value	6,009	6,113
Mutual funds
Available for Sale
Amortized Cost	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(48)	(24)
Estimated Fair Value	$ 952	$ 976

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