Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2021

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 June 30,				Six Months Ended June 30,
	2021		2020		2021		2020
	(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	(81,582)		(73,244)		(79,658)		(70,934)
CDI, net at beginning of period	23,891		32,229		25,815		34,539
CDI current period amortization	(1,852)		(2,210)		(3,776)		(4,520)
Total CDI, net at end of period	22,039		30,019		22,039		30,019
Intangible assets not subject to amortization	919		919		919		919
Other intangible assets, net at end of period	22,958		30,938		22,958		30,938
Total goodwill and other intangible assets at end of period	$	788,800	$	796,780	$	788,800	$	796,780

Estimated Future Amortization Expense of Core Deposit Intangibles

The following table provides the estimated future amortization expense of our CDI for the remaining six months ending December 31, 2021 and the succeeding four years:

	Year ending December 31,
	(in thousands)
2021	$	3,488
2022	5,880
2023	4,552
2024	3,432
2025	2,415