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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Jun. 30, 2020 USD ($) security | Sep. 30, 2019 USD ($) security
--- | --- | ---
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 7,021 | $ 291
Held to maturity, 12 Months or Longer, Estimated Fair Value | 52 | 3,090
Held to maturity, Total, Estimated Fair Value | 7,073 | 3,381
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (11) | (1)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (2) | (10)
Held to maturity, Total, Gross Unrealized Losses | $ (13) | $ (11)
Held to maturity, Less Than 12 Months, Quantity | security | 6 | 2
Held to maturity, 12 Months or Longer, Quantity | security | 6 | 12
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 35,709 |
Available for sale, 12 Months or Longer, Estimated Fair Value | 0 |
Available for sale, Total, Estimated Fair Value | 35,709 |
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (29) |
Available for sale, 12 Months or Longer, Gross Unrealized Losses | 0 |
Available for sale, Total, Gross Unrealized Losses | $ (29) |
Available-for-sale, Less than 12 Months, Quantity | security | 9 |
Available-for-sale, 12 Months or Longer, Quantity | security | 0 |
Mortgage-backed Securities, U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 7,014 | $ 291
Held to maturity, 12 Months or Longer, Estimated Fair Value | 41 | 76
Held to maturity, Total, Estimated Fair Value | 7,055 | 367
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (11) | (1)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (1) | (1)
Held to maturity, Total, Gross Unrealized Losses | $ (12) | $ (2)
Held to maturity, Less Than 12 Months, Quantity | security | 5 | 2
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 | $ 35,709 |
Available for sale, 12 Months or Longer, Estimated Fair Value | 0 |
Available for sale, Total, Estimated Fair Value | 35,709 |
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (29) |
Available for sale, 12 Months or Longer, Gross Unrealized Losses | 0 |
Available for sale, Total, Gross Unrealized Losses | $ (29) |
Available-for-sale, Less than 12 Months, Quantity | security | 9 |
Available-for-sale, 12 Months or Longer, Quantity | security | 0 |
Mortgage-backed Securities, Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 7 | $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value | 11 | 23
Held to maturity, Total, Estimated Fair Value | 18 | 23
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | 0 | 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (1) | (1)
Held to maturity, Total, Gross Unrealized Losses | $ (1) | $ (1)
Held to maturity, Less Than 12 Months, Quantity | security | 1 | 0
Held to maturity, 12 Months or Longer, Quantity | security | 2 | 5
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 |  | $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value |  | 2,991
Held to maturity, Total, Estimated Fair Value |  | 2,991
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses |  | 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses |  | (8)
Held to maturity, Total, Gross Unrealized Losses |  | $ (8)
Held to maturity, Less Than 12 Months, Quantity | security |  | 0
Held to maturity, 12 Months or Longer, Quantity | security |  | 1

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