Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

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, 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

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, 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

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 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