Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2020

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, 2020 were as follows:

	Community Banks		Insurance		Total
Balance at January 1, 2020	$	936,916	$	2,767	$	939,683
Addition to goodwill from acquisition	—		—		—
Balance at September 30, 2020	$	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, 2020
Core deposit intangibles	$	82,492	$	(51,925)	$	30,567
Customer relationship intangible	2,470		(1,239)		1,231
Total finite-lived intangible assets	$	84,962	$	(53,164)	$	31,798
December 31, 2019
Core deposit intangibles	$	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

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,
	2020		2019		2020		2019
Amortization expense for:
Core deposit intangibles	$	1,688	$	1,963	$	5,326	$	6,060
Customer relationship intangible	45		33		136		99
Total intangible amortization	$	1,733	$	1,996	$	5,462	$	6,159

Estimated amortization expense of finite-lived intangible assets

The estimated amortization expense of finite-lived intangible assets for the year ending December 31, 2020 and the succeeding four years is summarized as follows:

	Core Deposit Intangibles		Customer Relationship Intangible		Total
2020	$	6,939	$	181	$	7,120
2021	5,860		181		6,041
2022	4,940		181		5,121
2023	4,044		181		4,225
2024	3,498		181		3,679