Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 2017 and 2016:

(dollars in thousands)	2017		2016
Balance at January 1,	$	655,018	$	584,634
Acquisitions		—		—
Balance at March 31,	$	655,018	$	584,634

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

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

	Gross		Accumulated			Net
	Carrying		Amortization			Carrying
(dollars in thousands)	Amount		and Impairment			Amount
March 31, 2017
Amortized intangible assets:
Core deposit	$	81,663	$	(55,671	)	$	25,992
Customer trust relationships		16,547		(8,216	)		8,331
Customer loan relationships		4,413		(4,079	)		334
Total intangible assets	$	102,623	$	(67,966	)	$	34,657
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	$	7,995
2018		8,687
2019		6,737
2020		4,883
2021		3,111
Thereafter		3,244
Total	$	34,657