Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table presents changes in the carrying amount of goodwill for the years ended December 31, 2019, 2018, and 2017.

Changes in the Carrying Amount of Goodwill

(Dollar amounts in thousands)

	Years Ended December 31,
	2019		2018		2017
Beginning balance	$	728,809	$	697,608	$	340,879
Acquisitions	67,947		31,201		356,729
Ending balance	$	796,756	$	728,809	$	697,608

Schedule of Finite-Lived Intangible Assets

Other Intangible Assets

(Dollar amounts in thousands)

	Years Ended December 31,
	2019						2018						2017
	Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net		Gross		Accumulated Amortization		Net
Beginning balance	$	110,206	$	48,271	$	61,935	$	97,976	$	40,827	$	57,149	$	58,959	$	32,962	$	25,997
Additions	27,052		—		27,052		12,230		—		12,230		39,017		—		39,017
Amortization expense	—		10,481		(10,481)		—		7,444		(7,444)		—		7,865		(7,865)
Ending balance	$	137,258	$	58,752	$	78,506	$	110,206	$	48,271	$	61,935	$	97,976	$	40,827	$	57,149
Weighted-average remaining life (in years)					7.5						7.8						8.3
Estimated remaining useful lives (in years)					0.5 to 9.3						0.7 to 9.8						0.2 to 9.3

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Scheduled Amortization of Other Intangible Assets

(Dollar amounts in thousands)

	Total
Year Ending December 31,
2020	$	10,951
2021	10,875
2022	10,796
2023	10,418
2024	10,172
2025 and thereafter	25,294
Total	$	78,506