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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Held to Maturity |  |
Amortized Cost | $ 27,890 | $ 31,102
Gross Unrealized Gains | 1,942 | 1,489
Gross Unrealized Losses | (5) | (11)
Estimated Fair Value | 29,827 | 32,580
Available for Sale |  |
Amortized Cost |  | 22,418
Gross Unrealized Gains |  | 114
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 22,532
Mortgage-backed Securities, U.S. government agencies |  |
Held to Maturity |  |
Amortized Cost | 27,161 | 27,786
Gross Unrealized Gains | 1,635 | 999
Gross Unrealized Losses | (3) | (2)
Estimated Fair Value | 28,793 | 28,783
Available for Sale |  |
Amortized Cost | 57,797 | 22,418
Gross Unrealized Gains | 178 | 114
Gross Unrealized Losses | (68) | 0
Estimated Fair Value | 57,907 | 22,532
Mortgage-backed Securities, Private label residential |  |
Held to Maturity |  |
Amortized Cost | 229 | 317
Gross Unrealized Gains | 307 | 490
Gross Unrealized Losses | (1) | (1)
Estimated Fair Value | 535 | 806
U.S. agency securities |  |
Held to Maturity |  |
Amortized Cost |  | 2,999
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (8)
Estimated Fair Value |  | $ 2,991
Bank issued trust preferred securities |  |
Held to Maturity |  |
Amortized Cost | 500 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (1) |
Estimated Fair Value | $ 499 |

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