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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
Held to maturity
Amortized Cost	$ 7,077	$ 7,139
Gross Unrealized Gains	570	617
Gross Unrealized Losses	(38)	(12)
Estimated Fair Value	7,609	7,744
Available for sale
Amortized Cost	1,260	1,271
Gross Unrealized Gains	15	18
Gross Unrealized Losses	(54)	(48)
Estimated Fair Value	1,221	1,241
Mortgage-backed Securities, U.S. government agencies
Held to maturity
Amortized Cost	502	532
Gross Unrealized Gains	9	11
Gross Unrealized Losses	0	(1)
Estimated Fair Value	511	542
Available for sale
Amortized Cost	260	271
Gross Unrealized Gains	15	18
Gross Unrealized Losses	0	0
Estimated Fair Value	275	289
Mortgage-backed Securities, Private label residential
Held to maturity
Amortized Cost	580	599
Gross Unrealized Gains	561	596
Gross Unrealized Losses	(2)	(2)
Estimated Fair Value	1,139	1,193
U.S. Treasury and U.S government agency securities
Held to maturity
Amortized Cost	5,995	6,008
Gross Unrealized Gains	0	10
Gross Unrealized Losses	(36)	(9)
Estimated Fair Value	5,959	6,009
Mutual funds
Available for sale
Amortized Cost	1,000	1,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(54)	(48)
Estimated Fair Value	$ 946	$ 952

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