Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill and Intangible Assets

The following table sets forth activity for goodwill and other intangible assets for the periods indicated:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2017			2016			2017			2016
	(in thousands)
Goodwill
Total goodwill	$	382,762		$	382,762		$	382,762		$	382,762
Other intangible assets, net
Core deposit intangible:
Gross core deposit intangible balance at beginning of period	58,598			58,598			58,598			58,598
Accumulated amortization at beginning of period	(44,484		)	(39,006		)	(41,886		)	(35,940		)
Core deposit intangible, net at beginning of period	14,114			19,592			16,712			22,658
CDI current period amortization	(1,188		)	(1,460		)	(3,786		)	(4,526		)
Total core deposit intangible, net at end of period	12,926			18,132			12,926			18,132
Intangible assets not subject to amortization	919			919			919			919
Other intangible assets, net at end of period	13,845			19,051			13,845			19,051
Total goodwill and other intangible assets at end of period	$	396,607		$	401,813		$	396,607		$	401,813

Estimated Future Amortization Expense of Core Deposit Intangibles

The following table provides the estimated future amortization expense of core deposit intangibles for the remaining three months ending December 31, 2017 and the succeeding four years:

	Amount
	(in thousands)
Year ending December 31,
2017	$	1,127
2018	3,855
2019	2,951
2020	2,048
2021	1,440