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Debt Securities - Narrative (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) security | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) security
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated Fair Value | $ 165,714,000 |  |  | $ 121,786,000
Proceeds from sale of securities available for sale | 0 | $ 0 |  |
Gross realized gain (loss) | 0 | $ 0 |  |
Securities available for sale pledged as collateral market value | $ 94,208,000 |  |  | $ 94,876,000
Number of securities with unrealized losses | security | 91 |  |  | 100
Other than temporary impairment losses | $ 0 |  | $ 0 |
Collateral Pledged |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Estimated Fair Value | $ 93,499,000 |  |  | $ 94,337,000

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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