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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Dec. 31, 2017 USD ($) security | Sep. 30, 2017 USD ($) security
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Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 5,967 | $ 2,984
Held to maturity, 12 Months or Longer, Estimated Fair Value | 155 | 199
Held to maturity, Total, Estimated Fair Value | 6,122 | 3,183
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (36) | (9)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (2) | (3)
Held to maturity, Total, Gross Unrealized Losses | $ (38) | $ (12)
Held to maturity, Less Than 12 Months, Quantity | security | 4 | 1
Held to maturity, 12 Months or Longer, Quantity | security | 15 | 16
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 | 946 | 952
Available for sale, Total, Estimated Fair Value | 946 | 952
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 | (54) | (48)
Available for sale, Total, Gross Unrealized Losses | $ (54) | $ (48)
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 | $ 8 | $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value | 74 | 114
Held to maturity, Total, Estimated Fair Value | 82 | 114
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 | 0 | (1)
Held to maturity, Total, Gross Unrealized Losses | $ 0 | $ (1)
Held to maturity, Less Than 12 Months, Quantity | security | 2 | 0
Held to maturity, 12 Months or Longer, Quantity | security | 5 | 6
Mortgage-backed Securities, Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 0 | $ 0
Held to maturity, 12 Months or Longer, Estimated Fair Value | 81 | 85
Held to maturity, Total, Estimated Fair Value | 81 | 85
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 | (2) | (2)
Held to maturity, Total, Gross Unrealized Losses | $ (2) | $ (2)
Held to maturity, Less Than 12 Months, Quantity | security | 0 | 0
Held to maturity, 12 Months or Longer, Quantity | security | 10 | 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 | $ 5,959 | $ 2,984
Held to maturity, 12 Months or Longer, Estimated Fair Value | 0 | 0
Held to maturity, Total, Estimated Fair Value | 5,959 | 2,984
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (36) | (9)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | 0 | 0
Held to maturity, Total, Gross Unrealized Losses | $ (36) | $ (9)
Held to maturity, Less Than 12 Months, Quantity | security | 2 | 1
Held to maturity, 12 Months or Longer, Quantity | security | 0 | 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 | 946 | 952
Available for sale, Total, Estimated Fair Value | 946 | 952
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 | (54) | (48)
Available for sale, Total, Gross Unrealized Losses | $ (54) | $ (48)
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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