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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 124,657	$ 111,000	$ 96,834
Ending Balance	171,067	124,657	111,000
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(129)	(124)	(175)
Other comprehensive income	116	(5)	51
Ending Balance	50	(129)	(124)
ASU 2016-01 | Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income	63
Available-for-sale Securities [Member] | Changes in fair value of available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(58)	(19)	4
Other comprehensive income	85	(39)	(23)
Ending Balance	90	(58)	(19)
Available-for-sale Securities [Member] | ASU 2016-01 | Changes in fair value of available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income	63
Held-to-maturity Securities | Changes in fair value of available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(71)	(105)	(179)
Other comprehensive income	31	34	74
Ending Balance	(40)	$ (71)	$ (105)
Held-to-maturity Securities | ASU 2016-01 | Changes in fair value of available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income	$ 0

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

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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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