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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2016
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, 2016, and the year ended December 31, 2015 are provided in the following table.
(Dollars in thousands)
IBERIABANK
 
IMC
 
LTC
 
Total
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

Goodwill adjustments during the period
2,253

 
—

 
—

 
2,253

Balance, September 30, 2016
$
698,513

 
$
23,178

 
$
5,165

 
$
726,856
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, 2016
 
December 31, 2015
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
(Dollars in thousands)
 
 
 
 
 
Core deposit intangibles
$
74,001

 
$
(50,128
)
 
$
23,873

 
$
74,001

 
$
(43,957
)
 
$
30,044

Customer relationship intangible asset
1,348

 
(1,013
)
 
335

 
1,348

 
(984
)
 
364

Non-compete agreement
62

 
(18
)
 
44

 
100

 
(79
)
 
21

Other intangible assets
—

 
—

 
—

 
205

 
(114
)
 
91

Total
$
75,411

 
$
(51,159
)
 
$
24,252

 
$
75,654

 
$
(45,134
)
 
$
30,520

Mortgage servicing rights had the following carrying values as of the periods indicated:
 
September 30, 2016
 
December 31, 2015
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
(Dollars in thousands)
 
 
 
 
 
Mortgage servicing rights
$
6,295

 
$
(2,945
)
 
$
3,350

 
$
6,104

 
$
(2,320
)
 
$
3,784