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Goodwill and Intangibles
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangibles
Goodwill and Core Deposit Intangibles

Management analyzes its goodwill for impairment on an annual basis and between annual tests in certain circumstances, such as upon material adverse changes in legal, business, regulatory and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value. The Company performed an impairment assessment as of July 1, 2017 and 2016 and concluded that there was no impairment to goodwill.
Goodwill
 
 
As of March 31,
 
 
 
2018
 
2017
 
Net carrying value at beginning of period
 
$
444.7

 
$
212.8

 
Addition to goodwill from acquisition
 

 

 
Measurement period adjustment to previously recorded goodwill
 
0.9

 

 
Net carrying value at end of period
 
$
445.6

 
$
212.8

 


Core deposit intangibles (“CDI”)
 
 
Three Months Ended March 31,
 
 
 
2018
 
2017
 
CDI, net, beginning of period
 
$
49.1

 
$
9.7

 
CDI current period amortization
 
(1.8
)
 
(0.6
)
 
Total CDI, net, end of period
 
$
47.3

 
$
9.1

 


Core deposit intangibles are evaluated for impairment if events and circumstances indicate a possible impairment. The CDI are amortized using an accelerated method based on the estimated weighted average useful lives of the related deposits, which is generally ten years.

The following table provides the estimated future CDI amortization expense:
Years Ending December 31,
 
 
 
 
2018 remaining
 
 
$
5.2

 
2019
 
 
6.6

 
2020
 
 
6.2

 
2021
 
 
5.7

 
2022
 
 
5.3

 
Thereafter
 
 
18.3

 
Total
 
 
$
47.3