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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Held to Maturity |  |
Amortized Cost | $ 31,102 | $ 12,810
Gross Unrealized Gains | 1,489 | 560
Gross Unrealized Losses | (11) | (106)
Estimated Fair Value | 32,580 | 13,264
Available for Sale |  |
Amortized Cost |  | 1,231
Gross Unrealized Gains |  | 7
Gross Unrealized Losses |  | (84)
Estimated Fair Value |  | 1,154
Mortgage-backed Securities, U.S. government agencies |  |
Held to Maturity |  |
Amortized Cost | 27,786 | 1,385
Gross Unrealized Gains | 999 | 8
Gross Unrealized Losses | (2) | (21)
Estimated Fair Value | 28,783 | 1,372
Available for Sale |  |
Amortized Cost | 22,418 | 231
Gross Unrealized Gains | 114 | 7
Gross Unrealized Losses | 0 | (1)
Estimated Fair Value | 22,532 | 237
Mutual funds |  |
Available for Sale |  |
Amortized Cost |  | 1,000
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (83)
Estimated Fair Value |  | 917
Mortgage-backed Securities, Private label residential |  |
Held to Maturity |  |
Amortized Cost | 317 | 460
Gross Unrealized Gains | 490 | 552
Gross Unrealized Losses | (1) | (2)
Estimated Fair Value | 806 | 1,010
U.S. agency securities |  |
Held to Maturity |  |
Amortized Cost | 2,999 | 10,965
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (8) | (83)
Estimated Fair Value | $ 2,991 | $ 10,882

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