Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016, 2015, and 2014.

Changes in the Carrying Amount of Goodwill

(Dollar amounts in thousands)

	Years Ended December 31,
	2016		2015		2014
Beginning balance	$	319,007	$	310,589	$	264,062
Acquisitions	21,872		8,418		46,527
Ending balance	$	340,879	$	319,007	$	310,589

Schedule of Finite-Lived Intangible Assets

Other Intangible Assets

(Dollar amounts in thousands)

	Years Ended December 31,
	2016							2015							2014
	Gross		Accumulated Amortization		Net			Gross		Accumulated Amortization		Net			Gross		Accumulated Amortization		Net
Beginning balance	$	48,550	$	28,280	$	20,270		$	47,970	$	24,360	$	23,610		$	33,775	$	21,471	$	12,304
Additions	10,409		—		10,409			580		—		580			14,195		—		14,195
Amortization expense	—		4,682		(4,682		)	—		3,920		(3,920		)	—		2,889		(2,889		)
Ending balance	$	58,959	$	32,962	$	25,997		$	48,550	$	28,280	$	20,270		$	47,970	$	24,360	$	23,610
Weighted-average remaining life (in years)					7.6							7.4							8.0
Estimated remaining useful lives (in years)					0.6 to 9.3							0.8 to 10.0							0.3 to 10.3

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Scheduled Amortization of Other Intangible Assets

(Dollar amounts in thousands)

	Total
Year Ending December 31,
2017	$	4,161
2018	3,237
2019	3,172
2020	3,121
2021	3,045
2022 and thereafter	9,261
Total	$	25,997