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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Held to maturity |  |
Amortized Cost | $ 7,618 | $ 7,913
Gross Unrealized Gains | 920 | 994
Gross Unrealized Losses | (3) | (13)
Estimated Fair Value | 8,535 | 8,894
Available for sale |  |
Amortized Cost | 1,352 | 1,387
Gross Unrealized Gains | 31 | 34
Gross Unrealized Losses | (20) | (29)
Estimated Fair Value | 1,363 | 1,392
Mortgage-backed Securities, U.S. government agencies |  |
Held to maturity |  |
Amortized Cost | 711 | 828
Gross Unrealized Gains | 20 | 23
Gross Unrealized Losses | (1) | (1)
Estimated Fair Value | 730 | 850
Available for sale |  |
Amortized Cost | 352 | 387
Gross Unrealized Gains | 31 | 34
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 383 | 421
Mortgage-backed Securities, Private label residential |  |
Held to maturity |  |
Amortized Cost | 901 | 1,081
Gross Unrealized Gains | 787 | 894
Gross Unrealized Losses | (2) | (12)
Estimated Fair Value | 1,686 | 1,963
U.S. Treasury and U.S government agency securities |  |
Held to maturity |  |
Amortized Cost | 6,006 | 6,004
Gross Unrealized Gains | 113 | 77
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 6,119 | 6,081
Mutual funds |  |
Available for sale |  |
Amortized Cost | 1,000 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (20) | (29)
Estimated Fair Value | $ 980 | $ 971

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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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