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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | ---
Held to maturity |  |
Amortized Cost | $ 31,950 | $ 12,810
Gross Unrealized Gains | 617 | 560
Gross Unrealized Losses | (95) | (106)
Estimated Fair Value | 32,472 | 13,264
Available for sale |  |
Estimated Fair Value | 3,122 | 1,154
Mortgage-backed Securities, U.S. government agencies |  |
Held to maturity |  |
Amortized Cost | 20,551 | 1,385
Gross Unrealized Gains | 90 | 8
Gross Unrealized Losses | (25) | (21)
Estimated Fair Value | 20,616 | 1,372
Available for sale |  |
Amortized Cost | 2,299 | 231
Gross Unrealized Gains | 8 | 7
Gross Unrealized Losses | (110) | (1)
Estimated Fair Value | 2,197 | 237
Mortgage-backed Securities, Private label residential |  |
Held to maturity |  |
Amortized Cost | 424 | 460
Gross Unrealized Gains | 527 | 552
Gross Unrealized Losses | (2) | (2)
Estimated Fair Value | 949 | 1,010
U.S. Treasury and U.S government agency securities |  |
Held to maturity |  |
Amortized Cost | 10,975 | 10,965
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (68) | (83)
Estimated Fair Value | $ 10,907 | $ 10,882

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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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