Goodwill and Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amount of Goodwill

The following table shows the changes in the carrying amount of goodwill for the six months ended June 30, 2017 and 2016:

(dollars in thousands)	2017		2016
Balance at January 1,	$	655,018	$	584,634
Acquisitions		—		111,852
Divestitures		—		(40,963	)
Balance at June 30,	$	655,018	$	655,523

Schedule of Gross Carrying Amounts and Accumulated Amortization of Other Intangible Assets

The gross carrying amount and accumulated amortization of other intangible assets at June 30, 2017 and December 31, 2016 were as follows:

(dollars in thousands)	Gross Carrying Amount		Accumulated Amortization and Impairment			Net Carrying Amount
June 30, 2017
Amortized intangible assets:
Core deposit	$	81,663	$	(57,906	)	$	23,757
Customer trust relationships		16,547		(8,662	)		7,885
Customer loan relationships		4,413		(4,179	)		234
Total intangible assets	$	102,623	$	(70,747	)	$	31,876
December 31, 2016
Amortized intangible assets:
Core deposit	$	81,663	$	(53,214	)	$	28,449
Customer trust relationships		16,547		(7,753	)		8,794
Customer loan relationships		4,413		(3,979	)		434
Total intangible assets	$	102,623	$	(64,946	)	$	37,677

Schedule of Estimated Amortization Expense for Future Years

Estimated amortization expense for future years is as follows:

(dollars in thousands)
2017 remaining	$	5,214
2018		8,687
2019		6,737
2020		4,883
2021		3,111
Thereafter		3,244
Total	$	31,876