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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Sep. 30, 2019
--- | --- | ---
Held to maturity |  |
Amortized Cost | $ 30,660 | $ 31,102
Gross Unrealized Gains | 1,959 | 1,489
Gross Unrealized Losses | (13) | (11)
Estimated Fair Value | 32,606 | 32,580
Available for sale |  |
Estimated Fair Value | 42,891 | 23,490
Mortgage-backed Securities, U.S. government agencies |  |
Held to maturity |  |
Amortized Cost | 30,413 | 27,786
Gross Unrealized Gains | 1,657 | 999
Gross Unrealized Losses | (12) | (2)
Estimated Fair Value | 32,058 | 28,783
Available for sale |  |
Amortized Cost | 41,910 | 22,418
Gross Unrealized Gains | 33 | 114
Gross Unrealized Losses | (29) | 0
Estimated Fair Value | 41,914 | 22,532
Mortgage-backed Securities, Private label residential |  |
Held to maturity |  |
Amortized Cost | 247 | 317
Gross Unrealized Gains | 302 | 490
Gross Unrealized Losses | (1) | (1)
Estimated Fair Value | $ 548 | 806
U.S. Treasury and U.S government agency securities |  |
Held to maturity |  |
Amortized Cost |  | 2,999
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (8)
Estimated Fair Value |  | $ 2,991

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