Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

(In Thousands)

Changes in the carrying amount of goodwill during the years ended December 31, 2020 were as follows:


	Community Banks		Insurance		Total
Balance at December 31, 2018	$	930,161	$	2,767	$	932,928

Measurement period adjustments to goodwill from Brand acquisition	6,755		—		6,755
Balance at December 31, 2019	$	936,916	$	2,767	$	939,683

Additions to goodwill and other adjustments	—		—		—
Balance at December 31, 2020	$	936,916	$	2,767	$	939,683

The 2019 addition to goodwill resulted from measurement period adjustments from the Brand Group Holdings, Inc. (“Brand”) acquisition in September 2018 and is primarily related to adjustments on the fair value of loans, debt and other assets. The purchase accounting related to the Brand acquisition is now final. There were no changes to goodwill during the year ended December 31, 2020.

The following table provides a summary of finite-lived intangible assets as of the dates presented:


	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
December 31, 2020
Core deposit intangible	$	82,492	$	(53,539)	$	28,953
Customer relationship intangible	2,470		(1,284)		1,186
Total finite-lived intangible assets	$	84,962	$	(54,823)	$	30,139
December 31, 2019
Core deposit intangible	$	82,492	$	(46,599)	$	35,893
Customer relationship intangible	2,470		(1,103)		1,367
Total finite-lived intangible assets	$	84,962	$	(47,702)	$	37,260

Core deposit intangible amortization expense for the years ended December 31, 2020, 2019 and 2018 was $6,940, $7,965 and $7,048, respectively. Customer relationship intangible amortization expense for the year ended December 31, 2020, 2019, and 2018 was $181, $140, and $131, respectively.

The estimated amortization expense of finite-lived intangible assets for the five succeeding fiscal years is summarized as follows:


	Core Deposit Intangible		Customer Relationship Intangible		Total
2021	$	5,860	$	181	$	6,041
2022	4,940		181		5,121
2023	4,042		181		4,223
2024	3,498		181		3,679
2025	3,102		181		3,283