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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Held to maturity |  |
Amortized Cost | $ 114,600 | $ 69,102
Gross Unrealized Gains | 1,170 | 1,251
Gross Unrealized Losses | (571) | (244)
Estimated Fair Value | 115,199 | 70,109
Available for sale |  |
Total | 56,481 |
Estimated Fair Value | 57,498 | 64,131
Mortgage-backed Securities, U.S. government agencies |  |
Held to maturity |  |
Amortized Cost | 23,550 | 25,913
Gross Unrealized Gains | 781 | 936
Gross Unrealized Losses | (192) | (122)
Estimated Fair Value | 24,139 | 26,727
Available for sale |  |
Total | 56,481 | 63,080
Gross Unrealized Gains | 180 | 210
Gross Unrealized Losses | (109) | (114)
Estimated Fair Value | 56,552 | 63,176
Mortgage-backed Securities, Private label residential |  |
Held to maturity |  |
Amortized Cost | 23,355 | 13,929
Gross Unrealized Gains | 292 | 302
Gross Unrealized Losses | (94) | (23)
Estimated Fair Value | 23,553 | 14,208
Private label residential |  |
Held to maturity |  |
Amortized Cost | 67,195 | 28,760
Gross Unrealized Gains | 95 | 8
Gross Unrealized Losses | (285) | (99)
Estimated Fair Value | 67,005 | 28,669
Bank issued trust preferred securities |  |
Held to maturity |  |
Amortized Cost | 500 | 500
Gross Unrealized Gains | 2 | 5
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 502 | $ 505

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