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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
Held to maturity
Amortized Cost	$ 8,070	$ 7,139
Gross Unrealized Gains	577	617
Gross Unrealized Losses	(94)	(12)
Estimated Fair Value	8,553	7,744
Available for sale
Amortized Cost	1,252	1,271
Gross Unrealized Gains	10	18
Gross Unrealized Losses	(69)	(48)
Estimated Fair Value	1,193	1,241
Mortgage-backed Securities, U.S. government agencies
Held to maturity
Amortized Cost	1,547	532
Gross Unrealized Gains	9	11
Gross Unrealized Losses	(18)	(1)
Estimated Fair Value	1,538	542
Available for sale
Amortized Cost	252	271
Gross Unrealized Gains	10	18
Gross Unrealized Losses	0	0
Estimated Fair Value	262	289
Mortgage-backed Securities, Private label residential
Held to maturity
Amortized Cost	527	599
Gross Unrealized Gains	568	596
Gross Unrealized Losses	(2)	(2)
Estimated Fair Value	1,093	1,193
U.S. Treasury and U.S government agency securities
Held to maturity
Amortized Cost	5,996	6,008
Gross Unrealized Gains	0	10
Gross Unrealized Losses	(74)	(9)
Estimated Fair Value	5,922	6,009
Mutual funds
Available for sale
Amortized Cost	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(69)	(48)
Estimated Fair Value	$ 931	$ 952

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