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Intangible Assets
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets
Intangible assets at December 31, 2017 and 2016 are summarized as follows (in thousands):
 
2017
 
2016
Goodwill
$
411,600

 
411,600

Core deposit premiums
3,470

 
4,546

Customer relationship and other intangibles
4,483

 
5,957

Mortgage servicing rights
737

 
834

Total intangible assets
$
420,290

 
422,937



Amortization expense of intangible assets for the years ended December 31, 2017, 2016 and 2015 is as follows (in thousands):
 
2017
 
2016
 
2015
Core deposit premiums
$
1,076

 
1,300

 
1,757

Customer relationship and other intangibles
1,474

 
1,909

 
2,136

Mortgage servicing rights
120

 
182

 
173

Total amortization expense of intangible assets
$
2,670

 
3,391

 
4,066



Scheduled amortization of core deposit and customer relationship intangibles for each of the next five years is as follows (in thousands): 
Year ended December 31,
 
Scheduled Amortization
2018
 
$
2,004

2019
 
1,709

2020
 
1,415

2021
 
1,120

2022
 
825