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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Jun. 30, 2017 USD ($) security | Sep. 30, 2016 USD ($) security
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Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 3,054 | $ 10
Held to maturity, 12 Months or Longer, Estimated Fair Value | 173 | 208
Held to maturity, Total, Estimated Fair Value | 3,227 | 218
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (8) | 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (3) | (3)
Held to maturity, Total, Gross Unrealized Losses | $ (11) | $ (3)
Held to maturity, Less Than 12 Months, Quantity | security | 5 | 2
Held to maturity, 12 Months or Longer, Quantity | security | 16 | 15
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 0 | $ 0
Available for sale, 12 Months or Longer, Estimated Fair Value | 951 | 976
Available for sale, Total, Estimated Fair Value | 951 | 976
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | 0 | 0
Available for sale, 12 Months or Longer, Gross Unrealized Losses | (49) | (24)
Available for sale, Total, Gross Unrealized Losses | $ (49) | $ (24)
Available-for-sale, Less than 12 Months, Quantity | security | 0 | 0
Available-for-sale, 12 Months or Longer, Quantity | security | 1 | 1
Mortgage-backed Securities, U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 46 | $ 9
Held to maturity, 12 Months or Longer, Estimated Fair Value | 81 | 96
Held to maturity, Total, Estimated Fair Value | 127 | 105
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (1) | 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 | (1)
Held to maturity, Total, Gross Unrealized Losses | $ (1) | $ (1)
Held to maturity, Less Than 12 Months, Quantity | security | 2 | 1
Held to maturity, 12 Months or Longer, Quantity | security | 5 | 5
Mortgage-backed Securities, Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 21 | $ 1
Held to maturity, 12 Months or Longer, Estimated Fair Value | 92 | 112
Held to maturity, Total, Estimated Fair Value | 113 | 113
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (1) | 0
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (3) | (2)
Held to maturity, Total, Gross Unrealized Losses | $ (4) | $ (2)
Held to maturity, Less Than 12 Months, Quantity | security | 2 | 1
Held to maturity, 12 Months or Longer, Quantity | security | 11 | 10
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 | $ 2,987 |
Held to maturity, 12 Months or Longer, Estimated Fair Value | 0 |
Held to maturity, Total, Estimated Fair Value | 2,987 |
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (6) |
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 |
Held to maturity, Total, Gross Unrealized Losses | $ (6) |
Held to maturity, Less Than 12 Months, Quantity | security | 1 |
Held to maturity, 12 Months or Longer, Quantity | security | 0 |
Mutual funds |  |
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 0 | $ 0
Available for sale, 12 Months or Longer, Estimated Fair Value | 951 | 976
Available for sale, Total, Estimated Fair Value | 951 | 976
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | 0 | 0
Available for sale, 12 Months or Longer, Gross Unrealized Losses | (49) | (24)
Available for sale, Total, Gross Unrealized Losses | $ (49) | $ (24)
Available-for-sale, Less than 12 Months, Quantity | security | 0 | 0
Available-for-sale, 12 Months or Longer, Quantity | security | 1 | 1

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