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Goodwill and Other Acquired Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 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 three months ended March 31, 2017, and the year ended December 31, 2016 are provided in the following table.
(Dollars in thousands)
IBERIABANK
 
IMC
 
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 adjustments during the year
—

 
—

 
—

 
—

Balance, March 31, 2017
$
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:
 
March 31, 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 intangibles
$
74,001

 
$
(53,887
)
 
$
20,114

 
$
74,001

 
$
(52,165
)
 
$
21,836

Customer relationship intangible asset
1,273

 
(1,036
)
 
237

 
1,348

 
(1,064
)
 
284

Non-compete agreement
63

 
(27
)
 
36

 
63

 
(22
)
 
41

Total
$
75,337

 
$
(54,950
)
 
$
20,387

 
$
75,412

 
$
(53,251
)
 
$
22,161
Schedule of Amortization Expense of 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:
 
March 31, 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 intangibles
$
74,001

 
$
(53,887
)
 
$
20,114

 
$
74,001

 
$
(52,165
)
 
$
21,836

Customer relationship intangible asset
1,273

 
(1,036
)
 
237

 
1,348

 
(1,064
)
 
284

Non-compete agreement
63

 
(27
)
 
36

 
63

 
(22
)
 
41

Total
$
75,337

 
$
(54,950
)
 
$
20,387

 
$
75,412

 
$
(53,251
)
 
$
22,161
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:
 
March 31, 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
$
7,695

 
$
(3,346
)
 
$
4,349

 
$
7,202

 
$
(3,144
)
 
$
4,058