Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Carrying Amount of Goodwill

Changes to the carrying amount of goodwill by reporting unit for the nine months ended September 30, 2017, and the year ended December 31, 2016 are provided in the following table.

(Dollars in thousands)	IBERIABANK		Mortgage		LTC		Total
Balance, December 31, 2015	$	696,260	$	23,178	$	5,165	$	724,603
Goodwill adjustments during the year	2,253		—		—		2,253
Balance, December 31, 2016	$	698,513	$	23,178	$	5,165	$	726,856
Goodwill acquired during the year (preliminary allocation)	431,827		—		—		431,827
Balance, September 30, 2017	$	1,130,340	$	23,178	$	5,165	$	1,158,683

Schedule of Mortgage Servicing Rights

Mortgage Servicing Rights

Mortgage servicing rights are recorded at the lower of cost or market value in “other assets” on the Company's consolidated balance sheets and amortized over the remaining servicing life of the loans, with consideration given to prepayment assumptions. Mortgage servicing rights had the following carrying values as of the periods indicated:

	September 30, 2017							December 31, 2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
(Dollars in thousands)
Mortgage servicing rights	$	8,985	$	(3,747	)	$	5,238	$	7,202	$	(3,144	)	$	4,058

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 the periods indicated:

	September 30, 2017							December 31, 2016
(Dollars in thousands)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Core deposit intangible assets	$	157,964	$	(47,355	)	$	110,609	$	74,001	$	(52,165	)	$	21,836
Customer relationship intangible asset	1,143		(970		)	173		1,348		(1,064		)	284
Non-compete agreement	63		(35		)	28		63		(22		)	41
Total	$	159,170	$	(48,360	)	$	110,810	$	75,412	$	(53,251	)	$	22,161

Schedule of Amortization Expense of Intangible Assets

The estimated amortization expense of other intangible assets for the remainder of 2017 and the next five years is as follows:

(Dollars in thousands)	Amortization Expense
2017	$	5,969
2018	21,568
2019	18,105
2020	15,065
2021	11,256
2022	9,087