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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Held to maturity |  |
Amortized Cost | $ 37,645 | $ 12,810
Gross Unrealized Gains | 1,465 | 560
Gross Unrealized Losses | (19) | (106)
Estimated Fair Value | 39,091 | 13,264
Available for sale |  |
Amortized Cost |  | 1,231
Gross Unrealized Gains |  | 7
Gross Unrealized Losses |  | (84)
Estimated Fair Value | 2,979 | 1,154
Mortgage-backed Securities, U.S. government agencies |  |
Held to maturity |  |
Amortized Cost | 29,305 | 1,385
Gross Unrealized Gains | 966 | 8
Gross Unrealized Losses | (2) | (21)
Estimated Fair Value | 30,269 | 1,372
Available for sale |  |
Amortized Cost | 2,013 | 231
Gross Unrealized Gains | 22 | 7
Gross Unrealized Losses | (7) | (1)
Estimated Fair Value | 2,028 | 237
Mortgage-backed Securities, Private label residential |  |
Held to maturity |  |
Amortized Cost | 345 | 460
Gross Unrealized Gains | 499 | 552
Gross Unrealized Losses | (2) | (2)
Estimated Fair Value | 842 | 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 | 7,995 | 10,965
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (15) | (83)
Estimated Fair Value | $ 7,980 | $ 10,882

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