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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Held to maturity
Amortized Cost	$ 31,950	$ 12,810
Gross Unrealized Gains	617	560
Gross Unrealized Losses	(95)	(106)
Estimated Fair Value	32,472	13,264
Available for sale
Estimated Fair Value	3,122	1,154
Mortgage-backed Securities, U.S. government agencies
Held to maturity
Amortized Cost	20,551	1,385
Gross Unrealized Gains	90	8
Gross Unrealized Losses	(25)	(21)
Estimated Fair Value	20,616	1,372
Available for sale
Amortized Cost	2,299	231
Gross Unrealized Gains	8	7
Gross Unrealized Losses	(110)	(1)
Estimated Fair Value	2,197	237
Mortgage-backed Securities, Private label residential
Held to maturity
Amortized Cost	424	460
Gross Unrealized Gains	527	552
Gross Unrealized Losses	(2)	(2)
Estimated Fair Value	949	1,010
U.S. Treasury and U.S government agency securities
Held to maturity
Amortized Cost	10,975	10,965
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(68)	(83)
Estimated Fair Value	$ 10,907	$ 10,882

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