Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2018			2017
	(in thousands)
Goodwill
Total goodwill (1)	$	765,842		$	382,762
Other intangible assets, net
Core deposit intangible:
Gross core deposit intangible balance at beginning of period	105,473			58,598
Accumulated amortization at beginning of period	(48,219		)	(41,886		)
Core deposit intangible, net at beginning of period	57,254			16,712
CDI current period amortization	(3,188		)	(1,349		)
Total core deposit intangible, net at end of period	54,066			15,363
Intangible assets not subject to amortization	919			919
Other intangible assets, net at end of period	54,985			16,282
Total goodwill and other intangible assets at end of period	$	820,827		$	399,044

Estimated Future Amortization Expense of Core Deposit Intangibles

The following table provides the estimated future amortization expense of core deposit intangibles for the remaining nine months ending December 31, 2018 and the succeeding four years:

	Amount
	(in thousands)
Year ending December 31,
2018	$	9,048
2019	10,479
2020	8,724
2021	7,264
2022	5,880