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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Held to maturity |  |
Amortized Cost | $ 52,314 | $ 27,890
Gross Unrealized Gains | 1,382 | 1,942
Gross Unrealized Losses | (100) | (5)
Estimated Fair Value | 53,596 | 29,827
Available for sale |  |
Estimated Fair Value | 68,451 | 58,884
Mortgage-backed Securities, U.S. government agencies |  |
Held to maturity |  |
Amortized Cost | 24,508 | 27,161
Gross Unrealized Gains | 1,074 | 1,635
Gross Unrealized Losses | (19) | (3)
Estimated Fair Value | 25,563 | 28,793
Available for sale |  |
Amortized Cost | 67,306 | 57,797
Gross Unrealized Gains | 271 | 178
Gross Unrealized Losses | (86) | (68)
Estimated Fair Value | 67,491 | 57,907
Mortgage-backed Securities, Private label residential |  |
Held to maturity |  |
Amortized Cost | 8,432 | 229
Gross Unrealized Gains | 300 | 307
Gross Unrealized Losses | (22) | (1)
Estimated Fair Value | 8,710 | 535
U.S. Treasury and U.S. government agency securities |  |
Held to maturity |  |
Amortized Cost | 18,874 | 500
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (59) | (1)
Estimated Fair Value | 18,816 | $ 499
Bank issued trust preferred securities |  |
Held to maturity |  |
Amortized Cost | 500 |
Gross Unrealized Gains | 7 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | $ 507 |

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