Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill

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

Summary of finite-lived intangible assets

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

Estimated amortization expense of finite-lived intangible assets for future periods

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