Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

(In Thousands)

Changes in the carrying amount of goodwill during the years ended December 31, 2019 and 2018 were as follows:



	Community Banks		Insurance		Total
Balance at December 31, 2017	$	608,279	$	2,767	$	611,046
Addition to goodwill from Brand acquisition	321,882		—		321,882
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

The 2018 addition to goodwill from the Brand acquisition represents the excess of the purchase price over the initial fair value of the assets acquired and liabilities assumed in the transaction. The addition to goodwill in 2019 resulted from measurement period adjustments from the Brand acquisition 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.

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, 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
December 31, 2018
Core deposit intangible	$	82,492	$	(38,634	)	$	43,858
Customer relationship intangible	1,970		(963		)	1,007
Total finite-lived intangible assets	$	84,462	$	(39,597	)	$	44,865

Core deposit intangible amortization expense for the years ended December 31, 2019, 2018 and 2017 was $7,965, $7,048 and $6,399, respectively. Customer relationship intangible amortization expense for the year ended December 31, 2019 was $140, whereas the expense for the same time period in each of 2018 and 2017 was $131. 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
2020	$	6,940	$	181	$	7,121
2021	5,860		181		6,041
2022	4,940		181		5,121
2023	4,042		181		4,223
2024	3,498		181		3,679