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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Held to maturity |  |
Amortized Cost | $ 189,405 | $ 69,102
Gross Unrealized Gains | 512 | 1,251
Gross Unrealized Losses | (5,210) | (244)
Estimated Fair Value | 184,707 | 70,109
Available for sale |  |
Total | 50,745 |
Estimated Fair Value | 51,526 | 64,131
Mortgage-backed Securities, U.S. government agencies |  |
Held to maturity |  |
Amortized Cost | 21,858 | 25,913
Gross Unrealized Gains | 215 | 936
Gross Unrealized Losses | (508) | (122)
Estimated Fair Value | 21,565 | 26,727
Available for sale |  |
Total | 50,745 | 63,080
Gross Unrealized Gains | 105 | 210
Gross Unrealized Losses | (226) | (114)
Estimated Fair Value | 50,624 | 63,176
Mortgage-backed Securities, Private label residential |  |
Held to maturity |  |
Amortized Cost | 25,120 | 13,929
Gross Unrealized Gains | 273 | 302
Gross Unrealized Losses | (542) | (23)
Estimated Fair Value | 24,851 | 14,208
Private label residential |  |
Held to maturity |  |
Amortized Cost | 141,927 | 28,760
Gross Unrealized Gains | 24 | 8
Gross Unrealized Losses | (4,150) | (99)
Estimated Fair Value | 137,801 | 28,669
Bank issued trust preferred securities |  |
Held to maturity |  |
Amortized Cost | 500 | 500
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | (10) | 0
Estimated Fair Value | $ 490 | $ 505

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