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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Jun. 30, 2021 USD ($) security | Sep. 30, 2020 USD ($) security
--- | --- | ---
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 21,446 | $ 5,636
Held to maturity, 12 Months or Longer, Estimated Fair Value | 17 | 50
Held to maturity, Total, Estimated Fair Value | 21,463 | 5,686
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (100) | (3)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 | (2)
Held to maturity, Total, Gross Unrealized Losses | $ (100) | $ (5)
Held to maturity, Less Than 12 Months, Quantity | security | 10 | 6
Held to maturity, 12 Months or Longer, Quantity | security | 4 | 6
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 26,667 | $ 21,464
Available for sale, 12 Months or Longer, Estimated Fair Value | 926 | 0
Available for sale, Total, Estimated Fair Value | 27,593 | 21,464
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (86) | (68)
Available for sale, 12 Months or Longer, Gross Unrealized Losses | 0 | 0
Available for sale, Total, Gross Unrealized Losses | $ (86) | $ (68)
Available-for-sale, Less than 12 Months, Quantity | security | 15 | 11
Available-for-sale, 12 Months or Longer, Quantity | security | 1 | 0
Mortgage-backed Securities, U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 4,269 | $ 5,130
Held to maturity, 12 Months or Longer, Estimated Fair Value | 16 | 39
Held to maturity, Total, Estimated Fair Value | 4,285 | 5,169
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (19) | (2)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 | (1)
Held to maturity, Total, Gross Unrealized Losses | $ (19) | $ (3)
Held to maturity, Less Than 12 Months, Quantity | security | 5 | 4
Held to maturity, 12 Months or Longer, Quantity | security | 3 | 4
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 26,667 | $ 21,464
Available for sale, 12 Months or Longer, Estimated Fair Value | 926 | 0
Available for sale, Total, Estimated Fair Value | 27,593 | 21,464
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (86) | (68)
Available for sale, 12 Months or Longer, Gross Unrealized Losses | 0 | 0
Available for sale, Total, Gross Unrealized Losses | $ (86) | $ (68)
Available-for-sale, Less than 12 Months, Quantity | security | 15 | 11
Available-for-sale, 12 Months or Longer, Quantity | security | 1 | 0
Mortgage-backed Securities, Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 8,223 | $ 7
Held to maturity, 12 Months or Longer, Estimated Fair Value | 1 | 11
Held to maturity, Total, Estimated Fair Value | 8,224 | 18
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (22) | 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 | (1)
Held to maturity, Total, Gross Unrealized Losses | $ (22) | $ (1)
Held to maturity, Less Than 12 Months, Quantity | security | 2 | 1
Held to maturity, 12 Months or Longer, Quantity | security | 1 | 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 | $ 8,954 |
Held to maturity, 12 Months or Longer, Estimated Fair Value | 0 |
Held to maturity, Total, Estimated Fair Value | 8,954 |
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (59) |
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 |
Held to maturity, Total, Gross Unrealized Losses | $ (59) |
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 |  | $ 499
Held to maturity, 12 Months or Longer, Estimated Fair Value |  | 0
Held to maturity, Total, Estimated Fair Value |  | 499
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses |  | (1)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses |  | 0
Held to maturity, Total, Gross Unrealized Losses |  | $ (1)
Held to maturity, Less Than 12 Months, Quantity | security |  | 1
Held to maturity, 12 Months or Longer, Quantity | security |  | 0

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