Summary of Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Schedule of goodwill and intangible assets

The table below provides detail regarding the Company's intangible assets.

	Goodwill		Core Deposit and Other Intangibles			Total
	(In thousands)
Balance at September 30, 2015	$	291,503	$	7,855		$	299,358
Amortization	—		(2,369		)	(2,369		)
Balance at September 30, 2016	291,503		5,486			296,989
Additions	1,650		1,720			3,370
Amortization	—		(1,677		)	(1,677		)
Balance at September 30, 2017	$	293,153	$	5,529		$	298,682

Schedule of future amortization expense

The table below presents the estimated future amortization expense of core deposit and other intangibles for the next five years.

Fiscal Year	Expense
	(In thousands)
2018	$	1,376
2019	1,324
2020	1,295
2021	457
2022	138