Goodwill and Other Acquired Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Carrying Amount of Goodwill

Changes to the carrying amount of goodwill by reporting unit for the years ended December 31, 2019 and 2018 are provided in the following table:

(in thousands)	IBERIABANK		Mortgage		LTC		Total
Balance, December 31, 2017	$	1,160,559	$	23,178	$	5,165	$	1,188,902
Goodwill acquired and adjustments during the year	43,251		—		3,380		46,631
Balance, December 31, 2018	$	1,203,810	$	23,178	$	8,545	$	1,235,533
Goodwill acquired and adjustments during the year	—		—		—		—
Balance, December 31, 2019	$	1,203,810	$	23,178	$	8,545	$	1,235,533

Schedule of Definite-Lived Intangible Assets

Definite-lived intangible assets included in other intangible assets on the Company’s consolidated balance sheets had the following carrying values as of December 31:

	2019							2018
(in thousands)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Core deposit intangible assets	$	136,183	$	(81,493	)	$	54,690	$	136,183	$	(63,213	)	$	72,970
Customer relationship intangible asset	1,385		(1,371		)	14		1,385		(1,323		)	62
Non-compete agreement	206		(110		)	96		206		(72		)	134
Total	$	137,774	$	(82,974	)	$	54,800	$	137,774	$	(64,608	)	$	73,166

Schedule of Amortization Expense of Intangible Assets

The related amortization expense of intangible assets was as follows:

(in thousands)	Amount
Aggregate amortization expense for the years ended December 31:
2017	$	12,590
2018	21,678
2019	18,464

(in thousands)
Estimated amortization expense for the years ended December 31:
2020	$	14,504
2021	10,211
2022	7,715
2023	6,396
2024	5,333
2025 and thereafter	10,641