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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Held to Maturity |  |
Amortized Cost | $ 7,139 | $ 7,511
Gross Unrealized Gains | 617 | 887
Gross Unrealized Losses | (12) | (3)
Estimated Fair Value | 7,744 | 8,395
Available for Sale |  |
Amortized Cost | 1,271 | 1,336
Gross Unrealized Gains | 18 | 30
Gross Unrealized Losses | (48) | (24)
Estimated Fair Value | 1,241 | 1,342
Mortgage-backed Securities, U.S. government agencies |  |
Held to Maturity |  |
Amortized Cost | 532 | 670
Gross Unrealized Gains | 11 | 18
Gross Unrealized Losses | (1) | (1)
Estimated Fair Value | 542 | 687
Available for Sale |  |
Amortized Cost | 271 | 336
Gross Unrealized Gains | 18 | 30
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 289 | 366
Mortgage-backed Securities, Private label residential |  |
Held to Maturity |  |
Amortized Cost | 599 | 835
Gross Unrealized Gains | 596 | 762
Gross Unrealized Losses | (2) | (2)
Estimated Fair Value | 1,193 | 1,595
U.S. agency securities |  |
Held to Maturity |  |
Amortized Cost | 6,008 | 6,006
Gross Unrealized Gains | 10 | 107
Gross Unrealized Losses | (9) | 0
Estimated Fair Value | 6,009 | 6,113
Mutual funds |  |
Available for Sale |  |
Amortized Cost | 1,000 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (48) | (24)
Estimated Fair Value | $ 952 | $ 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=82897076&loc=d3e27161-111563 + Details
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