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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2015
Accounting Policies [Abstract]  
Schedule of goodwill and intangible assets
The balance of the Company's intangible assets was as follows:
 
Goodwill
 
Core Deposit Intangible
 
Total
 
(In thousands)
Balance at September 30, 2013
$
260,277

 
$
4,041

 
$
264,318

Additions
31,226

 
11,040

 
42,266

Amortization
—

 
(3,675
)
 
(3,675
)
Balance at September 30, 2014
291,503

 
11,406

 
302,909

Additions
—

 
—

 
—

Amortization
—

 
(3,551
)
 
(3,551
)
Balance at September 30, 2015
$
291,503

 
$
7,855

 
$
299,358
Schedule of future amortization expense
The table below presents the estimated core deposit intangible asset amortization expense for the next five years:
Year End
 
Expense
 
 
(In thousands)
2016
 
$
2,314

2017
 
1,607

2018
 
1,208

2019
 
1,254

2020
 
1,254