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GOODWILL (Tables)
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill
(Dollars in thousands)
June 30,
2019
 
December 31,
2018
Balance at beginning of year
$
880,251

 
$
204,084

Goodwill resulting from business combinations
(524
)
 
676,167

Balance at end of period
$
879,727

 
$
880,251