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Goodwill and Core Deposit Intangibles (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table presents changes in the carrying value of goodwill for the periods indicated:
 
2016
 
2015
 
(dollars in thousands)
Balance, beginning of year
$
50,832

 
$
22,950

Goodwill acquired during the year
51,658

 
27,882

Impairment losses
—

 
—

Balance, end of year
$
102,490

 
$
50,832

Accumulated impairment losses at end of year
—

 
—
Schedule of Finite-Lived Intangible Assets
The Company's change in the gross amount of core deposit intangibles and the related accumulated amortization consisted of the following at December 31:

 
2016
 
2015
 
2014
 
(dollars in thousands)
Gross amount of CDI:
 
 
 
 
 
Balance, beginning of year
$
10,782

 
$
7,876

 
$
7,876

Additions due to acquisitions
4,320

 
2,906

 
—

Balance, end of year
15,102

 
10,782

 
7,876

Accumulated amortization
 
 
 
 
 
Balance, beginning of year
(3,612
)
 
(2,262
)
 
(1,248
)
Amortization
(2,039
)
 
(1,350
)
 
(1,014
)
Balance, end of year
(5,651
)
 
(3,612
)
 
(2,262
)
Net CDI, end of year
$
9,451

 
$
7,170

 
$
5,614