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Goodwill and Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The change in goodwill during the years ended December 31, 2017, 2016, and 2015 is as follows (in thousands):
 
2017
 
2016
 
2015
Balance, beginning of year
$
40,231

 
$
29,917

 
$
29,917

Acquired goodwill
13,546

 
10,314

 

Impairment

 

 

Balance, end of year
$
53,777

 
$
40,231

 
$
29,917

Schedule of Expected Amortization Expense
The following table summarizes the Company’s estimated core deposit intangible amortization expense for each of the next five years (in thousands):
Years Ending December 31,
 
Estimated Core Deposit Intangible Amortization
2018
 
$
376

2019
 
376

2020
 
376

2021
 
376

2022
 
376

Thereafter
 
1,147

Total
 
$
3,027