Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2020

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:

	Years Ended December 31,
	2020		2019		2018
	(in thousands)
Total goodwill, end of period	$	765,842	$	765,842	$	765,842
Other intangible assets, net
CDI:
Gross CDI balance, beginning of period	105,473		105,473		105,473
Accumulated amortization, beginning of period	(70,934)		(60,455)		(48,219)
CDI, net, beginning of period	34,539		45,018		57,254
CDI current period amortization	(8,724)		(10,479)		(12,236)
Total CDI, end of period	25,815		34,539		45,018
Intangible assets not subject to amortization	919		919		919
Other intangible assets, net at end of period	26,734		35,458		45,937
Total goodwill and intangible assets, end of period	$	792,576	$	801,300	$	811,779

Estimated Future Amortization Expense of Core Deposit Intangibles

The following table provides the estimated future amortization expense of CDI for the succeeding five years:

	Years Ending December 31,
	(in thousands)
2021	$	7,264
2022	5,880
2023	4,552
2024	3,432
2025	2,415