Nature of Operations and Summary of Significant Policies - Schedule of Amortization Methods Used and Useful Lives (Details)	3 Months Ended
	Dec. 31, 2016
Core deposit | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	5 years
Core deposit | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	10 years
Brand intangible
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	15 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	8 years 6 months
Other Intangible | Minimum
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	1 year 3 months
Other Intangible | Maximum
Finite-Lived Intangible Assets [Line Items]
Intangible asset, useful life	9 years 4 months