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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Sep. 30, 2020 USD ($) security | Sep. 30, 2019 USD ($) security
--- | --- | ---
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 5,636 | $ 291
Estimated Fair Value - 12 Months or Longer | 50 | 3,090
Total Estimated Fair Value | 5,686 | 3,381
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (3) | (1)
Gross Unrealized Losses - 12 Months or Longer | (2) | (10)
Total Gross Unrealized Losses | $ (5) | $ (11)
Held-to-maturity, Qty, Less Than 12 Months | security | 6 | 2
Held-to-maturity, Qty, 12 Months or Longer | security | 6 | 12
Available-for-sale Securities, Gross Unrealized Losses: |  |
Estimated Fair Value - Less Than 12 Months | $ 21,464 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (68) |
Estimated Fair Value - 12 Months or Longer | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Total Estimated Fair Value | 21,464 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (68) |
Available-for-sale, Qty, Less than 12 Months | security | 11 |
Available-for-sale, Qty, 12 Months or Longer | security | 0 |
US Government Agencies Debt Securities |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 5,130 | $ 291
Estimated Fair Value - 12 Months or Longer | 39 | 76
Total Estimated Fair Value | 5,169 | 367
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (2) | (1)
Gross Unrealized Losses - 12 Months or Longer | (1) | (1)
Total Gross Unrealized Losses | $ (3) | $ (2)
Held-to-maturity, Qty, Less Than 12 Months | security | 4 | 2
Held-to-maturity, Qty, 12 Months or Longer | security | 4 | 6
Mortgage-backed Securities, Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 7 | $ 0
Estimated Fair Value - 12 Months or Longer | 11 | 23
Total Estimated Fair Value | 18 | 23
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | 0 | 0
Gross Unrealized Losses - 12 Months or Longer | (1) | (1)
Total Gross Unrealized Losses | $ (1) | $ (1)
Held-to-maturity, Qty, Less Than 12 Months | security | 1 | 0
Held-to-maturity, Qty, 12 Months or Longer | security | 2 | 5
Mortgage-backed Securities, U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 499 | $ 0
Estimated Fair Value - 12 Months or Longer | 0 | 2,991
Total Estimated Fair Value | 499 | 2,991
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (1) | 0
Gross Unrealized Losses - 12 Months or Longer | 0 | (8)
Total Gross Unrealized Losses | $ (1) | $ (8)
Held-to-maturity, Qty, Less Than 12 Months | security | 1 | 0
Held-to-maturity, Qty, 12 Months or Longer | security | 0 | 1
Available-for-sale Securities, Gross Unrealized Losses: |  |
Estimated Fair Value - Less Than 12 Months | $ 21,464 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | (68) |
Estimated Fair Value - 12 Months or Longer | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Total Estimated Fair Value | 21,464 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (68) |
Available-for-sale, Qty, Less than 12 Months | security | 11 |
Available-for-sale, Qty, 12 Months or Longer | security | 0 |

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