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Goodwill (Tables)
 6 Months Ended
Jun. 30, 2020
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 endedSix Months ended
(Dollars in thousands)June 30,
2020		June 30,
2019		June 30,
2020		June 30,
2019
Net carrying value at beginning of period$513,355  289,586  456,418  289,586  
Acquisitions and adjustments—  41,301  56,937  41,301  
Net carrying value at end of period$513,355  330,887  513,355  330,887