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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Held to Maturity
Amortized Cost	$ 12,810	$ 7,139
Gross Unrealized Gains	560	617
Gross Unrealized Losses	(106)	(12)
Estimated Fair Value	13,264	7,744
Available for Sale
Amortized Cost	1,231	1,271
Gross Unrealized Gains	7	18
Gross Unrealized Losses	(84)	(48)
Estimated Fair Value	1,154	1,241
Mortgage-backed Securities, U.S. government agencies
Held to Maturity
Amortized Cost	1,385	532
Gross Unrealized Gains	8	11
Gross Unrealized Losses	(21)	(1)
Estimated Fair Value	1,372	542
Available for Sale
Amortized Cost	231	271
Gross Unrealized Gains	7	18
Gross Unrealized Losses	(1)	0
Estimated Fair Value	237	289
Mortgage-backed Securities, Private label residential
Held to Maturity
Amortized Cost	460	599
Gross Unrealized Gains	552	596
Gross Unrealized Losses	(2)	(2)
Estimated Fair Value	1,010	1,193
U.S. agency securities
Held to Maturity
Amortized Cost	10,965	6,008
Gross Unrealized Gains	0	10
Gross Unrealized Losses	(83)	(9)
Estimated Fair Value	10,882	6,009
Mutual funds
Available for Sale
Amortized Cost	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(83)	(48)
Estimated Fair Value	$ 917	$ 952

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