Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying amounts of goodwill by operating segments

The carrying amounts of goodwill by operating segments for the three months endedMarch 31, 2019 were as follows:

	Community Banks		Insurance		Total
Balance at January 1, 2019	$	930,161	$	2,767	$	932,928
Addition to goodwill from acquisition	43		—		43
Balance at March 31, 2019	$	930,204	$	2,767	$	932,971

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
March 31, 2019
Core deposit intangibles	$	82,492	$	(40,711	)	$	41,781
Customer relationship intangible	1,970		(996		)	974
Total finite-lived intangible assets	$	84,462	$	(41,707	)	$	42,755
December 31, 2018
Core deposit intangibles	$	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

Current year amortization expense for finite-lived intangible assets

Current year amortization expense for finite-lived intangible assets is presented in the table below.

	Three Months Ended
	March 31,
	2019		2018
Amortization expense for:
Core deposit intangibles	$	2,077	$	1,618
Customer relationship intangible	33		33
Total intangible amortization	$	2,110	$	1,651

Estimated amortization expense of finite-lived intangible assets

The estimated amortization expense of finite-lived intangible assets for the year ending December 31, 2019 and the succeeding four 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