Loan Servicing Rights - Schedule of Loan Servicing Rights Activity and Valuation Allowance (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016
Loan servicing rights
Beginning of period	$ 5,794	$ 0
Additions	0	0
Amortization	(508)	0
End of period	5,286	0
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Beginning of period	(13)	0
Additions / (reductions)	5	0
End of period	(8)	0
Loan servicing rights, net	5,278	0	$ 5,781
Servicing fees received	548	0
Balance of loans serviced at:
Beginning of period	868,865	0
End of period	$ 823,375	$ 0