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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying value of goodwill
The following schedule discloses the changes in the carrying value of goodwill:

Three Months endedNine Months ended
(Dollars in thousands)September 30,
2019		September 30,
2018		September 30,
2019		September 30,
2018
Net carrying value at beginning of period$330,887  289,535  289,586  177,811  
Acquisitions125,535  —  166,836  111,724  
Net carrying value at end of period$456,422  289,535  456,422  289,535