Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

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 years ended December 31, 2016 and 2015:

(dollars in thousands)	2016			2015
Balance at January 1,	$	584,634		$	530,845
Acquisitions		111,347			57,619
Divestitures		(40,963	)		(3,830	)
Balance at December 31,	$	655,018		$	584,634

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

The gross carrying amounts and accumulated amortization of other intangible assets at December 31, 2016 and 2015 was as follows:

(dollars in thousands)	Gross Carrying Amount		Accumulated Amortization and Impairment			Net Carrying Amount
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
2015
Amortized intangible assets:
Core deposit	$	60,103	$	(43,982	)	$	16,121
Customer business relationships		30,787		(23,341	)		7,446
Customer trust relationships		16,547		(5,286	)		11,261
Customer loan relationships		4,413		(3,933	)		480
Total intangible assets	$	111,850	$	(76,542	)	$	35,308

Schedule of Estimated Amortization Expense for Future Years

Estimated amortization expense for future years is as follows:

(dollars in thousands)
2017	$	11,015
2018		8,687
2019		6,737
2020		4,883
2021		3,111
Thereafter		3,244
Total	$	37,677