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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Held to maturity |  |
Amortized Cost | $ 7,077 | $ 7,139
Gross Unrealized Gains | 570 | 617
Gross Unrealized Losses | (38) | (12)
Estimated Fair Value | 7,609 | 7,744
Available for sale |  |
Amortized Cost | 1,260 | 1,271
Gross Unrealized Gains | 15 | 18
Gross Unrealized Losses | (54) | (48)
Estimated Fair Value | 1,221 | 1,241
Mortgage-backed Securities, U.S. government agencies |  |
Held to maturity |  |
Amortized Cost | 502 | 532
Gross Unrealized Gains | 9 | 11
Gross Unrealized Losses | 0 | (1)
Estimated Fair Value | 511 | 542
Available for sale |  |
Amortized Cost | 260 | 271
Gross Unrealized Gains | 15 | 18
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 275 | 289
Mortgage-backed Securities, Private label residential |  |
Held to maturity |  |
Amortized Cost | 580 | 599
Gross Unrealized Gains | 561 | 596
Gross Unrealized Losses | (2) | (2)
Estimated Fair Value | 1,139 | 1,193
U.S. Treasury and U.S government agency securities |  |
Held to maturity |  |
Amortized Cost | 5,995 | 6,008
Gross Unrealized Gains | 0 | 10
Gross Unrealized Losses | (36) | (9)
Estimated Fair Value | 5,959 | 6,009
Mutual funds |  |
Available for sale |  |
Amortized Cost | 1,000 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (54) | (48)
Estimated Fair Value | $ 946 | $ 952

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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