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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Jun. 30, 2016 USD ($) security | Sep. 30, 2015 USD ($) security
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Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 88 | $ 50
Held to maturity, 12 Months or Longer, Estimated Fair Value | 196 | 220
Held to maturity, Total, Estimated Fair Value | 284 | 270
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 | (3) | (13)
Held to maturity, Total, Gross Unrealized Losses | $ (3) | $ (13)
Held to maturity, Less Than 12 Months, Quantity | security | 3 | 5
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 | $ 1
Available for sale, 12 Months or Longer, Estimated Fair Value | 980 | 1,019
Available for sale, Total, Estimated Fair Value | 980 | 1,020
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 | (20) | (29)
Available for sale, Total, Gross Unrealized Losses | $ (20) | $ (29)
Available-for-sale, Less than 12 Months, Quantity | security | 0 | 1
Available-for-sale, 12 Months or Longer, Quantity | security | 1 | 3
Mortgage-backed Securities, U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 87 | $ 49
Held to maturity, 12 Months or Longer, Estimated Fair Value | 57 | 63
Held to maturity, Total, Estimated Fair Value | 144 | 112
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 | 2 | 4
Held to maturity, 12 Months or Longer, Quantity | security | 4 | 5
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value |  | $ 1
Available for sale, 12 Months or Longer, Estimated Fair Value |  | 48
Available for sale, Total, Estimated Fair Value |  | 49
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses |  | 0
Available for sale, 12 Months or Longer, Gross Unrealized Losses |  | 0
Available for sale, Total, Gross Unrealized Losses |  | $ 0
Available-for-sale, Less than 12 Months, Quantity | security |  | 1
Available-for-sale, 12 Months or Longer, Quantity | security |  | 2
Mortgage-backed Securities, Private label residential |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 1 | $ 1
Held to maturity, 12 Months or Longer, Estimated Fair Value | 139 | 157
Held to maturity, Total, Estimated Fair Value | 140 | 158
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) | (12)
Held to maturity, Total, Gross Unrealized Losses | $ (2) | $ (12)
Held to maturity, Less Than 12 Months, Quantity | security | 1 | 1
Held to maturity, 12 Months or Longer, Quantity | security | 11 | 11
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 | 980 | 971
Available for sale, Total, Estimated Fair Value | 980 | 971
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 | (20) | (29)
Available for sale, Total, Gross Unrealized Losses | $ (20) | $ (29)
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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