Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2018

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,
	2018			2017			2018			2017
	(in thousands)
Goodwill
Total goodwill (1)	$	765,842		$	382,762		$	765,842		$	382,762
Other intangible assets, net
Core deposit intangible:
Gross core deposit intangible balance at beginning of period	105,473			58,598			105,473			58,598
Accumulated amortization at beginning of period	(54,495		)	(44,484		)	(48,219		)	(41,886		)
Core deposit intangible, net at beginning of period	50,978			14,114			57,254			16,712
CDI current period amortization	(3,070		)	(1,188		)	(9,346		)	(3,786		)
Total core deposit intangible, net at end of period	47,908			12,926			47,908			12,926
Intangible assets not subject to amortization	919			919			919			919
Other intangible assets, net at end of period	48,827			13,845			48,827			13,845
Total goodwill and other intangible assets at end of period	$	814,669		$	396,607		$	814,669		$	396,607

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(1) See Note 3, “Business Combinations,” for additional information regarding goodwill and intangible assets recorded related to the acquisition of Pacific Continental on November 1, 2017.

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, 2018 and the succeeding four years:

	Amount
	(in thousands)
Year ending December 31,
2018	$	2,890
2019	10,479
2020	8,724
2021	7,264
2022	5,880