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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 171,067	$ 124,657	$ 111,000
Ending Balance	187,630	171,067	124,657
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	50	(129)	(124)
Other comprehensive income (loss)	11	116	(5)
Ending Balance	61	50	(129)
ASU 2016-01 | Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss)		63
Available-for-sale Securities [Member] | Changes in fair value of available for sale securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	90	(58)	(19)
Other comprehensive income (loss)	(3)	85	(39)
Ending Balance	87	90	(58)
Available-for-sale Securities [Member] | ASU 2016-01 | Changes in fair value of available for sale securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss)		63
Held-to-maturity Securities | Changes in fair value of available for sale securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(40)	(71)	(105)
Other comprehensive income (loss)	14	31	34
Ending Balance	$ (26)	(40)	$ (71)
Held-to-maturity Securities | ASU 2016-01 | Changes in fair value of available for sale securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss)		$ 0

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount after tax of other comprehensive income (loss) attributable to parent entity.

+ References

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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