Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2022

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,
	2022		2021		2022		2021
	(in thousands)
Goodwill
Total goodwill	$	823,172	$	765,842	$	823,172	$	765,842
Other intangible assets, net
CDI:
Gross CDI balance at beginning of period (1)	88,931		105,473		88,931		105,473
Accumulated amortization at beginning of period	(59,710)		(83,434)		(55,203)		(79,658)
CDI, net at beginning of period	29,221		22,039		33,728		25,815
CDI current period amortization	(2,219)		(1,835)		(6,726)		(5,611)
Total CDI, net at end of period	27,002		20,204		27,002		20,204
Intangible assets not subject to amortization	919		919		919		919
Other intangible assets, net at end of period	27,921		21,123		27,921		21,123
Total goodwill and other intangible assets at end of period	$	851,093	$	786,965	$	851,093	$	786,965

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(1) For the three and nine months ended September 30, 2022, the gross CDI balance, beginning of period excludes fully amortized amounts. Prior period columns have not been adjusted.

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, 2022 and the succeeding four years:

	Total
	(in thousands)
Remainder of 2022	$	1,972
2023	7,082
2024	5,673
2025	4,366
2026	3,225