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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | ---
Held to maturity |  |
Amortized Cost | $ 7,418 | $ 7,511
Gross Unrealized Gains | 743 | 887
Gross Unrealized Losses | (27) | (3)
Estimated Fair Value | 8,134 | 8,395
Available for sale |  |
Amortized Cost | 1,323 | 1,336
Gross Unrealized Gains | 22 | 30
Gross Unrealized Losses | (57) | (24)
Estimated Fair Value | 1,288 | 1,342
Mortgage-backed Securities, U.S. government agencies |  |
Held to maturity |  |
Amortized Cost | 636 | 670
Gross Unrealized Gains | 15 | 18
Gross Unrealized Losses | (1) | (1)
Estimated Fair Value | 650 | 687
Available for sale |  |
Amortized Cost | 323 | 336
Gross Unrealized Gains | 22 | 30
Gross Unrealized Losses | (1) | 0
Estimated Fair Value | 344 | 366
Mortgage-backed Securities, Private label residential |  |
Held to maturity |  |
Amortized Cost | 775 | 835
Gross Unrealized Gains | 709 | 762
Gross Unrealized Losses | (5) | (2)
Estimated Fair Value | 1,479 | 1,595
U.S. Treasury and U.S government agency securities |  |
Held to maturity |  |
Amortized Cost | 6,007 | 6,006
Gross Unrealized Gains | 19 | 107
Gross Unrealized Losses | (21) | 0
Estimated Fair Value | 6,005 | 6,113
Mutual funds |  |
Available for sale |  |
Amortized Cost | 1,000 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (56) | (24)
Estimated Fair Value | $ 944 | $ 976

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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=73527792&loc=d3e27161-111563 + Details
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