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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 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 three months ended March 31, 2019, and the year ended December 31, 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, March 31, 2019
$
1,203,810

 
$
23,178

 
$
8,545

 
$
1,235,533
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:
 
March 31, 2019
 
December 31, 2018
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
(in thousands)
 
 
 
 
 
Mortgage servicing rights
$
14,636

 
$
(5,102
)
 
$
9,534

 
$
13,612

 
$
(4,806
)
 
$
8,806
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:
 
March 31, 2019
 
December 31, 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

 
$
(68,189
)
 
$
67,994

 
$
136,183

 
$
(63,213
)
 
$
72,970

Customer relationship intangible asset
1,385

 
(1,340
)
 
45

 
1,385

 
(1,323
)
 
62

Non-compete agreement
206

 
(84
)
 
122

 
206

 
(72
)
 
134

Total
$
137,774

 
$
(69,613
)
 
$
68,161

 
$
137,774

 
$
(64,608
)
 
$
73,166