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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill and Other Intangible Assets [Abstract]  
Summary of the gross carrying amount and accumulated amortization of amortizable intangible assets and the carrying amount of unamortized intangible assets

The following is a summary of the gross carrying amount and accumulated amortization of amortized intangible assets as of December 31, 2017 and December 31, 2016 and the carrying amount of unamortized intangible assets as of those same dates.

 

   December 31, 2017   December 31, 2016 
($ in thousands)  Gross Carrying
Amount		   Accumulated
Amortization		   Gross Carrying
Amount		   Accumulated
Amortization		 
Amortized intangible assets:                    
   Customer lists  $6,013    1,090    2,369    746 
   Core deposit intangibles   28,280    11,475    9,730    8,143 
   SBA servicing asset  2,194    207    415    — 
   Other   1,303    581    1,032    224 
        Total  $37,790    13,353    13,546    9,113 
                     
Unamortized intangible assets:                    
   Goodwill  $233,070         75,042      

 

Activity related to transactions since January 1, 2016 includes the following:

 

(1)In connection with the January 1, 2016 acquisition of Bankingport, Inc., an insurance agency located in Sanford, North Carolina, the Company recorded $1,693,000 in goodwill, $591,000 in a customer list intangible, and $92,000 in other amortizable intangible assets.
(2)In connection with the May 5, 2016 acquisition of SBA Complete, Inc., the Company recorded $4,333,000 in goodwill, $1,100,000 in a customer list intangible, and $940,000 in other amortizable intangible assets.
(3)In connection with the branch exchange transaction with First Community Bank on July 15, 2016, the Company recorded a net increase of $1,961,000 in goodwill and $1,170,000 in a core deposit intangible.
(4)In connection with the Carolina Bank acquisition on March 3, 2017, the Company recorded a net increase of $65,516,000 in goodwill and $8,790,000 in core deposit premiums.
(5)In connection with the September 1, 2017 acquisition of Bear Insurance Service, the Company recorded $5,330,000 in goodwill, $3,644,000 in a customer list intangible, and $271,000 in other amortizable intangible assets.
(6)In connection with the Asheville Savings Bank acquisition on October 1, 2017, the Company recorded a net increase of $88,400,000 in goodwill and $9,760,000 in a core deposit intangible.

 
Schedule of the estimated amortization expense for the five succeeding fiscal years

The following table presents the estimated amortization expense related to amortizable intangible assets, excluding SBA servicing assets, for each of the five calendar years ending December 31, 2022 and the estimated amount amortizable thereafter. These estimates are subject to change in future periods to the extent management determines it is necessary to make adjustments to the carrying value or estimated useful lives of amortized intangible assets.

 

($ in thousands)

 		  Estimated
Amortization Expense		 
2018  $5,917 
2019   4,858 
2020   3,841 
2021   2,927 
2022   2,022 
Thereafter   2,885 
         Total  $22,450