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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | ---
Held to maturity |  |
Amortized Cost | $ 36,465 | $ 27,890
Gross Unrealized Gains | 1,476 | 1,942
Gross Unrealized Losses | (103) | (5)
Estimated Fair Value | 37,838 | 29,827
Available for sale |  |
Estimated Fair Value | 70,141 | 58,884
Mortgage-backed Securities, U.S. government agencies |  |
Held to maturity |  |
Amortized Cost | 21,888 | 27,161
Gross Unrealized Gains | 1,164 | 1,635
Gross Unrealized Losses | (9) | (3)
Estimated Fair Value | 23,043 | 28,793
Available for sale |  |
Amortized Cost | 69,001 | 57,797
Gross Unrealized Gains | 282 | 178
Gross Unrealized Losses | (99) | (68)
Estimated Fair Value | 69,184 | 57,907
Mortgage-backed Securities, Private label residential |  |
Held to maturity |  |
Amortized Cost | 5,056 | 229
Gross Unrealized Gains | 312 | 307
Gross Unrealized Losses | (23) | (1)
Estimated Fair Value | 5,345 | 535
U.S. Treasury and U.S. government agency securities |  |
Held to maturity |  |
Amortized Cost | 9,021 | 500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (68) | (1)
Estimated Fair Value | 8,953 | $ 499
Bank issued trust preferred securities |  |
Held to maturity |  |
Amortized Cost | 500 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (3) |
Estimated Fair Value | $ 497 |

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