Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2016

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,
	2016			2015			2016			2015
	(in thousands)
Goodwill
Goodwill at beginning of period	$	382,762		$	382,537		$	382,762		$	382,537
Provisional period adjustments	—			225			—			225
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	(39,006		)	(32,593		)	(35,940		)	(29,058		)
Core deposit intangible, net at beginning of period	19,592			26,005			22,658			29,540
CDI current period amortization	(1,460		)	(1,695		)	(4,526		)	(5,230		)
Total core deposit intangible, net at end of period	18,132			24,310			18,132			24,310
Intangible assets not subject to amortization	919			919			919			919
Other intangible assets, net at end of period	19,051			25,229			19,051			25,229
Total goodwill and other intangible assets at end of period	$	401,813		$	407,991		$	401,813		$	407,991

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, 2016 and the succeeding four years:

	Amount
	(in thousands)
Year ending December 31,
2016	$	1,419
2017	4,913
2018	3,855
2019	2,951
2020	2,048