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Goodwill and Other Intangible Assets
12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets
(In Thousands)
Changes in the carrying amount of goodwill during the years ended December 31, 2016 and 2015 were as follows:
 
Community Banks
 
Insurance
 
Total
Balance at December 31, 2014
$
271,939

 
$
2,767

 
$
274,706

Addition to goodwill from Heritage acquisition
171,182

 

 
171,182

Adjustment to previously recorded goodwill
(17
)
 

 
(17
)
Balance at December 31, 2015
$
443,104

 
$
2,767

 
$
445,871

Addition to goodwill from KeyWorth acquisition
20,633

 

 
20,633

Adjustment to previously recorded goodwill
4,030

 

 
4,030

Balance at December 31, 2016
$
467,767

 
$
2,767

 
$
470,534



The addition to goodwill in 2016 from the KeyWorth acquisition and in 2015 from the Heritage acquisition represents the excess of the purchase price over the fair value of assets acquired and liabilities assumed in the transaction. The Company is finalizing the fair values of property and equipment related to the KeyWorth acquisition; as such, the recorded balance of goodwill is subject to change. The adjustment to previously recorded goodwill is due to valuation adjustments on property and equipment as well as certain loans acquired from Heritage. The adjustment to previously recorded goodwill in 2015 reflects tax benefits associated with the exercise of stock options assumed in connection with prior acquisitions.
The following table provides a summary of finite-lived intangible assets as of the dates presented:
 
Gross  Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying
Amount
December 31, 2016
 
 
 
 
 
Core deposit intangible
$
47,992

 
$
(25,188
)
 
$
22,804

Customer relationship intangible
1,970

 
(700
)
 
1,270

Total finite-lived intangible assets
$
49,962

 
$
(25,888
)
 
$
24,074

December 31, 2015
 
 
 
 
 
Core deposit intangible
$
45,982

 
$
(18,572
)
 
$
27,410

Customer relationship intangible
1,970

 
(569
)
 
1,401

Total finite-lived intangible assets
$
47,952

 
$
(19,141
)
 
$
28,811



Core deposit intangible amortization expense for the years ended December 31, 2016, 2015 and 2014 was $6,616, $5,938 and $5,475, respectively. Customer relationship intangible amortization expense for the years ended December 31, 2016, 2015 and 2014 was $131 each year. The estimated amortization expense of finite-lived intangible assets for the five succeeding fiscal years is summarized as follows:
 
Core Deposit Intangibles
 
Customer Relationship Intangible
 
Total
2017
$
5,723

 
$
131

 
$
5,854

2018
4,881

 
131

 
5,012

2019
4,101

 
131

 
4,232

2020
3,213

 
131

 
3,344

2021
2,273

 
131

 
2,404