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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill
The following schedule discloses the changes in the carrying value of goodwill:
Three Months endedNine Months ended
(Dollars in thousands)September 30,
2021		September 30,
2020		September 30,
2021		September 30,
2020
Net carrying value at beginning of period$514,013 513,355 514,013 456,418 
Acquisitions and adjustments— 658 — 57,595 
Net carrying value at end of period$514,013 514,013 514,013 514,013