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GOODWILL (Tables)
9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill
(Dollars in thousands)
September 30,
2018
 
December 31,
2017
Balance at beginning of year
$
204,084

 
$
204,084

Goodwill resulting from business combinations
676,949

 
0

Balance at end of period
$
881,033

 
$
204,084