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Investment Securities: Unrealized Gain (Loss) on Investments (Details) $ in Thousands | Dec. 31, 2018 USD ($) security | Sep. 30, 2018 USD ($) security
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Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 6,413 | $ 8,900
Held to maturity, 12 Months or Longer, Estimated Fair Value | 6,941 | 3,049
Held to maturity, Total, Estimated Fair Value | 13,354 | 11,949
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (17) | (42)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (78) | (64)
Held to maturity, Total, Gross Unrealized Losses | $ (95) | $ (106)
Held to maturity, Less Than 12 Months, Quantity | security | 8 | 4
Held to maturity, 12 Months or Longer, Quantity | security | 15 | 14
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 2,004 | $ 34
Available for sale, 12 Months or Longer, Estimated Fair Value | 0 | 0
Available for sale, Total, Estimated Fair Value | 2,004 | 34
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (110) | (1)
Available for sale, 12 Months or Longer, Gross Unrealized Losses | 0 | 0
Available for sale, Total, Gross Unrealized Losses | $ (110) | $ (1)
Available-for-sale, Less than 12 Months, Quantity | security | 7 | 1
Available-for-sale, 12 Months or Longer, Quantity | security | 0 | 0
Mortgage-backed Securities, U.S. government agencies |  |
Held-to-maturity Securities, Fair Value: |  |
Held to maturity, Less Than 12 Months, Estimated Fair Value | $ 1,443 | $ 954
Held to maturity, 12 Months or Longer, Estimated Fair Value | 960 | 64
Held to maturity, Total, Estimated Fair Value | 2,403 | 1,018
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (10) | (20)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (15) | (1)
Held to maturity, Total, Gross Unrealized Losses | $ (25) | $ (21)
Held to maturity, Less Than 12 Months, Quantity | security | 7 | 2
Held to maturity, 12 Months or Longer, Quantity | security | 6 | 5
Available-for-sale Securities, Fair Value: |  |
Available for sale, Less Than 12 Months, Estimated Fair Value | $ 2,004 | $ 34
Available for sale, 12 Months or Longer, Estimated Fair Value | 0 | 0
Available for sale, Total, Estimated Fair Value | 2,004 | 34
Available-for-sale Securities, Gross Unrealized Losses: |  |
Available for sale, Less Than 12 Months, Gross Unrealized Losses | (110) | (1)
Available for sale, 12 Months or Longer, Gross Unrealized Losses | 0 | 0
Available for sale, Total, Gross Unrealized Losses | $ (110) | $ (1)
Available-for-sale, Less than 12 Months, Quantity | security | 7 | 1
Available-for-sale, 12 Months or Longer, Quantity | security | 0 | 0
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 | 45 | 50
Held to maturity, Total, Estimated Fair Value | 45 | 50
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 | 7 | 8
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 | $ 4,970 | $ 7,946
Held to maturity, 12 Months or Longer, Estimated Fair Value | 5,936 | 2,935
Held to maturity, Total, Estimated Fair Value | 10,906 | 10,881
Held-to-maturity Securities, Gross Unrealized Losses |  |
Held to maturity, Less Than 12 Months, Gross Unrealized Losses | (7) | (22)
Held to maturity, 12 Months or Longer, Gross Unrealized Losses | (61) | (61)
Held to maturity, Total, Gross Unrealized Losses | $ (68) | $ (83)
Held to maturity, Less Than 12 Months, Quantity | security | 1 | 2
Held to maturity, 12 Months or Longer, Quantity | security | 2 | 1

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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