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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Carrying Amount of Goodwill
Changes to the carrying amount of goodwill by reporting unit for the six months ended June 30, 2018, and the year ended December 31, 2017 are provided in the following table.
(Dollars in thousands)
IBERIABANK
 
Mortgage
 
LTC
 
Total
Balance, December 31, 2016
$
698,513

 
$
23,178

 
$
5,165

 
$
726,856

Goodwill acquired during the year (preliminary allocation)
462,046

 
—

 
—

 
462,046

Balance, December 31, 2017
$
1,160,559

 
$
23,178

 
$
5,165

 
$
1,188,902

Goodwill acquired during the year (preliminary allocation) and adjustments
31,490

 
—

 
3,380

 
34,870

Balance, June 30, 2018
$
1,192,049

 
$
23,178

 
$
8,545

 
$
1,223,772
Schedule of Mortgage Servicing Rights
Mortgage Servicing Rights
Mortgage servicing rights are recorded at the lower of cost or market value in “other intangible 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:
 
June 30, 2018
 
December 31, 2017
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
(Dollars in thousands)
 
 
 
 
 
Mortgage servicing rights
$
10,822

 
$
(4,323
)
 
$
6,499

 
$
9,588

 
$
(3,931
)
 
$
5,657
Schedule of Definite-Lived Intangible Assets
Definite-lived intangible assets had the following carrying values included in “other intangible assets” on the Company’s consolidated balance sheets as of the periods indicated:
 
June 30, 2018
 
December 31, 2017
(Dollars in thousands)
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Core deposit intangible assets
$
136,183

 
$
(52,812
)
 
$
83,371

 
$
127,957

 
$
(51,971
)
 
$
75,986

Customer relationship intangible asset
1,385

 
(1,284
)
 
101

 
1,143

 
(996
)
 
147

Non-compete agreement
206

 
(48
)
 
158

 
63

 
(39
)
 
24

Total
$
137,774

 
$
(54,144
)
 
$
83,630

 
$
129,163

 
$
(53,006
)
 
$
76,157