Goodwill and Other Intangible Assets

(In Thousands)

Changes in the carrying amount of goodwill during the years ended December 31, 2018 and 2017 were as follows:



	Community Banks		Insurance		Total
Balance at December 31, 2016	$	467,767	$	2,767	$	470,534
Addition to goodwill from Metropolitan acquisition	140,512		—		140,512
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

The additions to goodwill in 2018 from the Brand acquisition and in 2017 from the Metropolitan acquisition represent the excess of the purchase price over the fair value of assets acquired and liabilities assumed in the relevant transaction. The Company is in the process of completing Brand's final tax return and finalizing the fair values of loans and property and equipment related to the Brand acquisition; as a result, the recorded balance of goodwill attributable to the Brand acquisition is subject to change in future periods.

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, 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
December 31, 2017
Core deposit intangible	$	54,958	$	(31,586	)	$	23,372
Customer relationship intangible	1,970		(832		)	1,138
Total finite-lived intangible assets	$	56,928	$	(32,418	)	$	24,510

Core deposit intangible amortization expense for the years ended December 31, 2018, 2017 and 2016 was $7,048, $6,399 and $6,616, respectively. Customer relationship intangible amortization expense for the years ended December 31, 2018, 2017 and 2016 was $131 each year. The estimated amortization expense of finite-lived intangible assets for the five succeeding fiscal years is summarized as follows:



	Core Deposit Intangibles		Customer Relationship Intangible		Total
2019	$	7,965	$	131	$	8,096
2020	6,939		131		7,070
2021	5,860		131		5,991
2022	4,940		131		5,071
2023	4,044		131		4,175