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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ 111,000	$ 96,834	$ 89,187
Ending Balance		124,657	111,000	96,834
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]	(124)	(175)	(313)
Net change	[1]	(5)	51	138
Ending Balance	[1]	(129)	(124)	(175)
Changes in fair value of available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]	(19)	4	3
Net change	[1]	(39)	(23)	1
Ending Balance	[1]	(58)	(19)	4
Other-than-temporary impairment on held to maturity securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[1]	(105)	(179)	(316)
Net change	[1]	34	74	137
Ending Balance	[1]	$ (71)	$ (105)	$ (179)
[1] All amounts are net of income taxes.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
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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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-Topic 210
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