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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill

The following table presents the changes in the carrying amount of goodwill for the periods presented.

 

    As of and for the Year Ended December 31,  
    2017     2016  
    (Dollars in thousands)  

Balance, beginning of period

     $ 89,533          $ 74,244     

Additions due to acquisitions

     27,031          15,289     
 

 

 

    

 

 

  

Balance, end of period

     $                 116,564          $                   89,533     
 

 

 

    

 

 

  
Summary of Amortizable Intangible Assets

The following summarizes activity of amortizable core deposit intangible (“CDI”) assets for the periods presented.

 

    As of and For the Year Ended December 31,  
    2017     2016  
    Gross CDI     Accumulated     Net CDI     Gross CDI     Accumulated     Net CDI  
    Amount     Amortization     Amount     Amount     Amortization     Amount  
    (Dollars in thousands)  

Balance of intangible assets, beginning of period

     $ 37,940          $     (32,930)         $ 5,010          $ 34,089          $     (31,824)       $     2,265     

Additions due to acquisitions

     3,157              3,851         
 

 

 

        

 

 

      

Balance of intangible assets, end of period

     $     41,097          $ (34,259)         $         6,838          $     37,940          $ (32,930)       $ 5,010     
 

 

 

        

 

 

      

Aggregate amortization expense:

            

For year ended December 31,

     $ 1,329              $ 1,106         

Estimated Amortization Expense:

            

For the year ending December 31, 2018

     1,304               

For the year ending December 31, 2019

     1,067               

For the year ending December 31, 2020

     718               

For the year ending December 31, 2021

     703               

Thereafter

     3,046