Significant Accounting Policies (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2017
Acquired Indefinite-lived Intangible Assets [Line Items]
Goodwill	$ 25,989,000		$ 25,989,000		$ 25,989,000
Goodwill impairment					0
Uncertain tax positions	0		0		$ 0
Income tax interest expense	0	$ 0
Income tax penalties expense			0	$ 0
Cash, FDIC insured amount	$ 250,000,000		$ 250,000,000
Employee Stock Option
Acquired Indefinite-lived Intangible Assets [Line Items]
Number of awards authorized for issuance (in shares)	0		0
Expiration term of share-based compensation plan			10 years
Employee Stock Option | Long Term Incentive Plan 2006 [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Number of awards authorized for issuance (in shares)	0		0
Expiration term of share-based compensation plan			10 years
Minimum
Acquired Indefinite-lived Intangible Assets [Line Items]
Estimated useful of long-lived assets			3 years
Maximum
Acquired Indefinite-lived Intangible Assets [Line Items]
Estimated useful of long-lived assets			7 years