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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Mar. 31, 2022 USD ($) security | Sep. 30, 2021 USD ($) security
--- | --- | ---
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 157,753 | $ 36,598
Held to maturity, 12 Months or Longer, Estimated Fair Value | 3,772 | 16
Held to maturity, Total, Estimated Fair Value | 161,525 | 36,614
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (5,172) | (244)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (38) | 0
Held to maturity, Total, Gross Unrealized Losses | $ (5,210) | $ (244)
Held to maturity, Less Than 12 Months, Quantity | security | 49 | 14
Held to maturity, 12 Months or Longer, Quantity | security | 6 | 4
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 12,072 | $ 20,146
Available for sale, 12 Months or Longer, Estimated Fair Value | 17,391 | 5,491
Available for sale, Total, Estimated Fair Value | 29,463 | 25,637
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (27) | (103)
Available for sale, 12 Months or Longer, Gross Unrealized Losses | (199) | (11)
Available for sale, Total, Gross Unrealized Losses | $ (226) | $ (114)
Available-for-sale, Less than 12 Months, Quantity | security | 10 | 13
Available-for-sale, 12 Months or Longer, Quantity | security | 10 | 3
Mortgage-backed Securities, U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 8,405 | $ 18,795
Held to maturity, 12 Months or Longer, Estimated Fair Value | 416 | 0
Held to maturity, Total, Estimated Fair Value | 8,821 | 18,795
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (507) | (99)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (1) | 0
Held to maturity, Total, Gross Unrealized Losses | $ (508) | $ (99)
Held to maturity, Less Than 12 Months, Quantity | security | 10 | 5
Held to maturity, 12 Months or Longer, Quantity | security | 4 | 0
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 12,072 | $ 20,146
Available for sale, 12 Months or Longer, Estimated Fair Value | 17,391 | 5,491
Available for sale, Total, Estimated Fair Value | 29,463 | 25,637
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (27) | (103)
Available for sale, 12 Months or Longer, Gross Unrealized Losses | (199) | (11)
Available for sale, Total, Gross Unrealized Losses | $ (226) | $ (114)
Available-for-sale, Less than 12 Months, Quantity | security | 10 | 13
Available-for-sale, 12 Months or Longer, Quantity | security | 10 | 3
Mortgage-backed Securities, Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 21,091 | $ 8,091
Held to maturity, 12 Months or Longer, Estimated Fair Value | 3,356 | 15
Held to maturity, Total, Estimated Fair Value | 24,447 | 8,106
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (505) | (122)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (37) | 0
Held to maturity, Total, Gross Unrealized Losses | $ (542) | $ (122)
Held to maturity, Less Than 12 Months, Quantity | security | 15 | 5
Held to maturity, 12 Months or Longer, Quantity | security | 1 | 3
Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 127,757 |
Held to maturity, 12 Months or Longer, Estimated Fair Value | 0 |
Held to maturity, Total, Estimated Fair Value | 127,757 |
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (4,150) |
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 |
Held to maturity, Total, Gross Unrealized Losses | $ (4,150) |
Held to maturity, Less Than 12 Months, Quantity | security | 23 |
Held to maturity, 12 Months or Longer, Quantity | security | 1 |
Bank issued trust preferred securities |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 500 | $ 9,712
Held to maturity, 12 Months or Longer, Estimated Fair Value | 0 | 1
Held to maturity, Total, Estimated Fair Value | 500 | 9,713
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (10) | (23)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 | 0
Held to maturity, Total, Gross Unrealized Losses | $ (10) | $ (23)
Held to maturity, Less Than 12 Months, Quantity | security | 1 | 4
Held to maturity, 12 Months or Longer, Quantity | security | 0 | 1

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