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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016
Held to maturity
Amortized Cost	$ 7,418	$ 7,511
Gross Unrealized Gains	743	887
Gross Unrealized Losses	(27)	(3)
Estimated Fair Value	8,134	8,395
Available for sale
Amortized Cost	1,323	1,336
Gross Unrealized Gains	22	30
Gross Unrealized Losses	(57)	(24)
Estimated Fair Value	1,288	1,342
Mortgage-backed Securities, U.S. government agencies
Held to maturity
Amortized Cost	636	670
Gross Unrealized Gains	15	18
Gross Unrealized Losses	(1)	(1)
Estimated Fair Value	650	687
Available for sale
Amortized Cost	323	336
Gross Unrealized Gains	22	30
Gross Unrealized Losses	(1)	0
Estimated Fair Value	344	366
Mortgage-backed Securities, Private label residential
Held to maturity
Amortized Cost	775	835
Gross Unrealized Gains	709	762
Gross Unrealized Losses	(5)	(2)
Estimated Fair Value	1,479	1,595
U.S. Treasury and U.S government agency securities
Held to maturity
Amortized Cost	6,007	6,006
Gross Unrealized Gains	19	107
Gross Unrealized Losses	(21)	0
Estimated Fair Value	6,005	6,113
Mutual funds
Available for sale
Amortized Cost	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(56)	(24)
Estimated Fair Value	$ 944	$ 976

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