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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
The following table presents goodwill as of the dates presented:
 
December 31,
(dollars in thousands)
2016
 
2015
Balance at beginning of year
$
291,764

 
$
175,820

Additions
—

 
115,944

Other adjustments
(94
)
 
—

Balance at End of Year
$
291,670

 
$
291,764
Summary of Intangible Assets
The following table shows a summary of intangible assets as of the dates presented:
 
December 31,
(dollars in thousands)
2016
 
2015
Gross carrying amount at beginning of year
$
22,114

 
$
16,401

Additions
—

 
5,713

Accumulated amortization
(17,204
)
 
(15,589
)
Balance at End of Year
$
4,910

 
$
6,525
Summary of Expected Amortization Expense for Finite-Lived Intangibles Assets
The following is a summary of the expected amortization expense for finite-lived intangible assets, assuming no new additions, for each of the five years following December 31, 2016:
(dollars in thousands)
Amount

2017
$
1,311

2018
812

2019
689

2020
588

2021
512

Total
$
3,912