Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Carrying amounts of goodwill by operating segments

The carrying amounts of goodwill by operating segments for the nine months ended September 30, 2019 were as follows:

	Community Banks		Insurance		Total
Balance at January 1, 2019	$	930,161	$	2,767	$	932,928
Measurement period adjustment to goodwill from Brand acquisition	6,755		—		6,755
Balance at September 30, 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
September 30, 2019
Core deposit intangibles	$	82,492	$	(44,694	)	$	37,798
Customer relationship intangible	1,970		(1,061		)	909
Total finite-lived intangible assets	$	84,462	$	(45,755	)	$	38,707
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				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Amortization expense for:
Core deposit intangibles	$	1,963	$	1,732	$	6,060	$	4,911
Customer relationship intangible	33		33		99		99
Total intangible amortization	$	1,996	$	1,765	$	6,159	$	5,010

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