Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2019

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,
	2019			2018			2019			2018
	(in thousands)
Goodwill
Total goodwill	$	765,842		$	765,842		$	765,842		$	765,842
Other intangible assets, net
CDI:
Gross CDI balance at beginning of period	105,473			105,473			105,473			105,473
Accumulated amortization at beginning of period	(65,852		)	(54,495		)	(60,455		)	(48,219		)
CDI, net at beginning of period	39,621			50,978			45,018			57,254
CDI current period amortization	(2,632		)	(3,070		)	(8,029		)	(9,346		)
Total CDI, net at end of period	36,989			47,908			36,989			47,908
Intangible assets not subject to amortization	919			919			919			919
Other intangible assets, net at end of period	37,908			48,827			37,908			48,827
Total goodwill and other intangible assets at end of period	$	803,750		$	814,669		$	803,750		$	814,669

Estimated Future Amortization Expense of Core Deposit Intangibles

The following table provides the estimated future amortization expense of our CDI for the remaining three months ending December 31, 2019 and the succeeding four years:

	Year ending December 31,
	(in thousands)
2019	$	2,451
2020	8,724
2021	7,264
2022	5,880
2023	4,552