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Goodwill and Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill and Intangible Assets
The following table sets forth activity for goodwill and other intangible assets for the period:
 
 
Years Ended December 31,
 
 
2014
 
2013
 
2012
 
 
(in thousands)
Total goodwill, beginning of period
 
$
343,952

 
$
115,554

 
$
115,554

Established through acquisitions
 
38,585

 
228,398

 

Total goodwill, end of period
 
382,537

 
343,952

 
115,554

Other intangible assets, net
 
 
 
 
 
 
Core deposit intangible:
 
 
 
 
 
 
Gross core deposit intangible balance, beginning of period
 
47,698

 
32,441

 
32,441

Accumulated amortization, beginning of period
 
(22,765
)
 
(16,720
)
 
(12,275
)
Core deposit intangible, net, beginning of period
 
24,933

 
15,721

 
20,166

Established through acquisitions
 
10,900

 
15,257

 

CDI current period amortization
 
(6,293
)
 
(6,045
)
 
(4,445
)
Total core deposit intangible, end of period
 
29,540

 
24,933

 
15,721

Intangible assets not subject to amortization
 
919

 
919

 

Other intangible assets, net at end of period
 
30,459

 
25,852

 
15,721

Total goodwill and intangible assets, end of period
 
$
412,996

 
$
369,804

 
$
131,275

Estimated Future Amortization Expense of Core Deposit Intangibles
The following table provides the estimated future amortization expense of core deposit intangibles for the succeeding five years:
 
Years Ending December 31,
 
(in thousands)
2015
 
$
6,882

2016
 
5,945

2017
 
4,913

2018
 
3,855

2019
 
2,951