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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
Held to maturity
Amortized Cost	$ 41,361	$ 12,810
Gross Unrealized Gains	886	560
Gross Unrealized Losses	(57)	(106)
Estimated Fair Value	42,190	13,264
Available for sale
Amortized Cost		1,231
Gross Unrealized Gains		7
Gross Unrealized Losses		(84)
Estimated Fair Value	3,078	1,154
Mortgage-backed Securities, U.S. government agencies
Held to maturity
Amortized Cost	30,001	1,385
Gross Unrealized Gains	386	8
Gross Unrealized Losses	(16)	(21)
Estimated Fair Value	30,371	1,372
Available for sale
Amortized Cost	2,138	231
Gross Unrealized Gains	13	7
Gross Unrealized Losses	(10)	(1)
Estimated Fair Value	2,141	237
Mortgage-backed Securities, Private label residential
Held to maturity
Amortized Cost	375	460
Gross Unrealized Gains	500	552
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value	874	1,010
Mutual funds
Available for sale
Amortized Cost		1,000
Gross Unrealized Gains		0
Gross Unrealized Losses		(83)
Estimated Fair Value		917
U.S. Treasury and U.S government agency securities
Held to maturity
Amortized Cost	10,985	10,965
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(40)	(83)
Estimated Fair Value	$ 10,945	$ 10,882

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