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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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The market value of available-for-sale securities that serve as collateral for borrowings.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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