Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2021		2020
	(in thousands)
Goodwill
Total goodwill	$	765,842	$	765,842
Other intangible assets, net
CDI:
Gross CDI balance at beginning of period	105,473		105,473
Accumulated amortization at beginning of period	(79,658)		(70,934)
CDI, net at beginning of period	25,815		34,539
CDI current period amortization	(1,924)		(2,310)
Total CDI, net at end of period	23,891		32,229
Intangible assets not subject to amortization	919		919
Other intangible assets, net at end of period	24,810		33,148
Total goodwill and other intangible assets at end of period	$	790,652	$	798,990

Estimated Future Amortization Expense of Core Deposit Intangibles

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

	Year ending December 31,
	(in thousands)
2021	$	5,340
2022	5,880
2023	4,552
2024	3,432
2025	2,415