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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 USD ($) security | Sep. 30, 2016 USD ($) security
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 2,984 | $ 10
Estimated Fair Value - 12 Months or Longer | 199 | 208
Total Estimated Fair Value | 3,183 | 218
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (9) | 0
Gross Unrealized Losses - 12 Months or Longer | (3) | (3)
Total Gross Unrealized Losses | $ (12) | $ (3)
Held-to-maturity, Qty, Less Than 12 Months | security | 1 | 2
Held-to-maturity, Qty, 12 Months or Longer | security | 16 | 15
Available-for-sale Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 0 | $ 0
Estimated Fair Value - 12 Months or Longer | 952 | 976
Total Estimated Fair Value | 952 | 976
Available-for-sale Securities, Gross Unrealized Losses: |  |
Gross Unrealized Losses - Less Than 12 Months | 0 | 0
Gross Unrealized Losses - 12 Months or Longer | (48) | (24)
Total Gross Unrealized Losses | $ (48) | $ (24)
Available-for-sale, Qty, Less than 12 Months | security | 0 | 0
Available-for-sale, Qty, 12 Months or Longer | security | 1 | 1
Mortgage-backed Securities, U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 0 | $ 9
Estimated Fair Value - 12 Months or Longer | 114 | 96
Total Estimated Fair Value | 114 | 105
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 | 0 | 1
Held-to-maturity, Qty, 12 Months or Longer | security | 6 | 5
Mortgage-backed Securities, Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 0 | $ 1
Estimated Fair Value - 12 Months or Longer | 85 | 112
Total Estimated Fair Value | 85 | 113
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | 0 | 0
Gross Unrealized Losses - 12 Months or Longer | (2) | (2)
Total Gross Unrealized Losses | $ (2) | $ (2)
Held-to-maturity, Qty, Less Than 12 Months | security | 0 | 1
Held-to-maturity, Qty, 12 Months or Longer | security | 10 | 10
US Government Agencies Debt Securities |  |
Held-to-maturity Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 2,984 |
Estimated Fair Value - 12 Months or Longer | 0 |
Total Estimated Fair Value | 2,984 |
Held-to-maturity Securities, Gross Unrealized Losses |  |
Gross Unrealized Losses - Less Than 12 Months | (9) |
Gross Unrealized Losses - 12 Months or Longer | 0 |
Total Gross Unrealized Losses | $ (9) |
Held-to-maturity, Qty, Less Than 12 Months | security | 1 |
Held-to-maturity, Qty, 12 Months or Longer | security | 0 |
Mutual funds |  |
Available-for-sale Securities, Fair Value: |  |
Estimated Fair Value - Less Than 12 Months | $ 0 | $ 0
Estimated Fair Value - 12 Months or Longer | 952 | 976
Total Estimated Fair Value | 952 | 976
Available-for-sale Securities, Gross Unrealized Losses: |  |
Gross Unrealized Losses - Less Than 12 Months | 0 | 0
Gross Unrealized Losses - 12 Months or Longer | (48) | (24)
Total Gross Unrealized Losses | $ (48) | $ (24)
Available-for-sale, Qty, Less than 12 Months | security | 0 | 0
Available-for-sale, Qty, 12 Months or Longer | security | 1 | 1

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