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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2018
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, 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

Additions (1)
8,215

 
6,595

 
14,810

Amortization (2)
—

 
(2,206
)
 
(2,206
)
Balance at September 30, 2018
$
301,368

 
$
9,918

 
$
311,286


(1) During 2018, an immaterial correction was recorded related to acquisitions of insurance agency businesses in prior years. The balance sheet classification correction resulted in an increase in goodwill of $7,135,000 and finite-lived intangible assets of $5,106,000 and a corresponding decrease in other assets of $12,241,000.
(2) During 2018, an immaterial correction of $1,500,000 was recorded to amortization expense for intangible assets stemming from acquisitions of insurance agency businesses in prior years.
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)
2019
 
$
2,033

2020
 
1,990

2021
 
1,140

2022
 
804

2023
 
775