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Intangibles (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets
The following table presents Sterling's acquired finite-lived intangible assets at September 30, 2018 and December 31, 2017 (in thousands):
 
 
 
September 30, 2018
 
December 31, 2017
 
Weighted
Average
Life
 
Gross
Carrying
Amount
 

Accumulated
Amortization
 
Gross
Carrying
Amount
 

Accumulated
Amortization
Customer relationships
23 years
 
$
40,823

 
$
(2,707
)
 
$
40,823

 
$
(1,353
)
Trade name
13 years
 
5,307

 
(788
)
 
5,307

 
(394
)
Noncompetition agreements
7 years
 
487

 
(104
)
 
487

 
(52
)
  Total
22 years
 
$
46,617

 
$
(3,599
)
 
$
46,617

 
$
(1,799
)