Goodwill and Other Acquired Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Carrying Amount of Goodwill

Changes to the carrying amount of goodwill by reportable segment for the years ended December 31, 2015 and 2014 are provided in the following table.

(Dollars in thousands)	IBERIABANK		IMC		LTC		Total
Balance, December 31, 2013	$	373,905	$	23,178	$	4,789	$	401,872
Goodwill acquired during the year	115,278		—		376		115,654
Balance, December 31, 2014	$	489,183	$	23,178	$	5,165	$	517,526
Goodwill acquired during the year	207,077		—		—		207,077
Balance, December 31, 2015	$	696,260	$	23,178	$	5,165	$	724,603

Schedule of Definite-Lived Intangible Assets

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

	2015							2014
(Dollars in thousands)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Core deposit intangibles	$	74,001	$	(43,957	)	$	30,044	$	55,949	$	(36,354	)	$	19,595
Customer relationship intangible asset	1,348		(984		)	364		1,348		(822		)	526
Non-compete agreement	100		(79		)	21		163		(82		)	81
Other intangible assets	205		(114		)	91		205		(46		)	159
Total	$	75,654	$	(45,134	)	$	30,520	$	57,665	$	(37,304	)	$	20,361

Schedule of Amortization Expense of Intangible Assets

The related amortization expense of intangible assets is as follows:

(Dollars in thousands)	Amount
Aggregate amortization expense for the years ended December 31:
2013	$	4,720
2014	5,807
2015	7,811

(Dollars in thousands)
Estimated amortization expense for the years ended December 31:
2016	$	8,338
2017	6,775
2018	5,786
2019	5,066
2020	3,613
2021 and thereafter	942