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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Mar. 31, 2021 USD ($) security | Sep. 30, 2020 USD ($) security
--- | --- | ---
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 16,384 | $ 5,636
Held to maturity, 12 Months or Longer, Estimated Fair Value | 36 | 50
Held to maturity, Total, Estimated Fair Value | 16,420 | 5,686
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (102) | (3)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (1) | (2)
Held to maturity, Total, Gross Unrealized Losses | $ (103) | $ (5)
Held to maturity, Less Than 12 Months, Quantity | security | 8 | 6
Held to maturity, 12 Months or Longer, Quantity | security | 6 | 6
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 22,873 | $ 21,464
Available for sale, 12 Months or Longer, Estimated Fair Value | 0 | 0
Available for sale, Total, Estimated Fair Value | 22,873 | 21,464
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (99) | (68)
Available for sale, 12 Months or Longer, Gross Unrealized Losses | 0 | 0
Available for sale, Total, Gross Unrealized Losses | $ (99) | $ (68)
Available-for-sale, Less than 12 Months, Quantity | security | 12 | 11
Available-for-sale, 12 Months or Longer, Quantity | security | 0 | 0
Mortgage-backed Securities, U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 2,098 | $ 5,130
Held to maturity, 12 Months or Longer, Estimated Fair Value | 34 | 39
Held to maturity, Total, Estimated Fair Value | 2,132 | 5,169
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (8) | (2)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (1) | (1)
Held to maturity, Total, Gross Unrealized Losses | $ (9) | $ (3)
Held to maturity, Less Than 12 Months, Quantity | security | 3 | 4
Held to maturity, 12 Months or Longer, Quantity | security | 4 | 4
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 22,873 | $ 21,464
Available for sale, 12 Months or Longer, Estimated Fair Value | 0 | 0
Available for sale, Total, Estimated Fair Value | 22,873 | 21,464
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (99) | (68)
Available for sale, 12 Months or Longer, Gross Unrealized Losses | 0 | 0
Available for sale, Total, Gross Unrealized Losses | $ (99) | $ (68)
Available-for-sale, Less than 12 Months, Quantity | security | 12 | 11
Available-for-sale, 12 Months or Longer, Quantity | security | 0 | 0
Mortgage-backed Securities, Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 4,836 | $ 7
Held to maturity, 12 Months or Longer, Estimated Fair Value | 2 | 11
Held to maturity, Total, Estimated Fair Value | 4,838 | 18
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (23) | 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 | (1)
Held to maturity, Total, Gross Unrealized Losses | $ (23) | $ (1)
Held to maturity, Less Than 12 Months, Quantity | security | 1 | 1
Held to maturity, 12 Months or Longer, Quantity | security | 2 | 2
U.S. Treasury and U.S. government agency securities |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 8,953 |
Held to maturity, 12 Months or Longer, Estimated Fair Value | 0 |
Held to maturity, Total, Estimated Fair Value | 8,953 |
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (68) |
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 |
Held to maturity, Total, Gross Unrealized Losses | $ (68) |
Held to maturity, Less Than 12 Months, Quantity | security | 3 |
Held to maturity, 12 Months or Longer, Quantity | security | 0 |
Bank issued trust preferred securities |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 497 | $ 499
Held to maturity, 12 Months or Longer, Estimated Fair Value | 0 | 0
Held to maturity, Total, Estimated Fair Value | 497 | 499
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (3) | (1)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 | 0
Held to maturity, Total, Gross Unrealized Losses | $ (3) | $ (1)
Held to maturity, Less Than 12 Months, Quantity | security | 1 | 1
Held to maturity, 12 Months or Longer, Quantity | security | 0 | 0

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