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GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND IDENTIFIABLE INTANGIBLE ASSETS
GOODWILL AND OTHER INTANGIBLE ASSETS     
The following table sets forth the carrying value of goodwill and other intangible assets, net of accumulated amortization, at December 31:
 
2017
 
2016
 
(Dollars in thousands)
Balances not subject to amortization
 
 
 
Goodwill
$
231,806

 
$
221,526

Balances subject to amortization
 
 
 
Core deposit intangibles
8,636

 
8,527

Other intangible assets
705

 
1,321

Total other intangible assets
9,341

 
9,848

Total goodwill and other intangible assets
$
241,147

 
$
231,374

 
The changes in the carrying value of goodwill for the periods indicated were as follows:
 
2017
 
2016
 
(Dollars in thousands)
Balance at beginning of year
$
221,526

 
$
201,083

Acquisitions
10,280

 
20,443

Balance at end of year
$
231,806

 
$
221,526


The gross carrying amount and accumulated amortization of other intangible assets were as follows at the dates indicated:
 
December 31
 
2017
 
2016
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
 
(Dollars in thousands)
Core deposit intangibles
$
26,736

 
$
(18,100
)
 
$
8,636

 
$
23,917

 
$
(15,390
)
 
$
8,527

Other intangible assets
3,165

 
(2,460
)
 
705

 
3,020

 
(1,699
)
 
1,321

Total
$
29,901

 
$
(20,560
)
 
$
9,341

 
$
26,937

 
$
(17,089
)
 
$
9,848

 
Amortization of intangible assets was $3.5 million for 2017 and $2.8 million for both 2016 and 2015.
The following table sets forth the estimated annual amortization expense of intangible assets for each of the next five years:
Year
Amount
 
(Dollars in thousands)
2018
$
2,394

2019
$
1,687

2020
$
1,414

2021
$
1,245

2022
$
948


The original weighted average amortization period for intangible assets is 9.8 years.