Business Segments (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

	Year Ended December 31, 2015
(Dollars in thousands)	IBERIABANK			IMC			LTC			Consolidated
Interest and dividend income	$	639,793		$	7,062		$	3		$	646,858
Interest expense	56,222			2,878			—			59,100
Net interest income	583,571			4,184			3			587,758
Provision for loan losses	30,908			—			—			30,908
Mortgage income	1,426			79,696			—			81,122
Title revenue	—			—			22,837			22,837
Other non-interest income	116,443			(2		)	(7		)	116,434
Allocated expenses	(16,253		)	12,036			4,217			—
Non-interest expense	495,158			57,784			17,363			570,305
Income before income tax expense	191,627			14,058			1,253			206,938
Income tax expense	58,006			5,581			507			64,094
Net income	$	133,621		$	8,477		$	746		$	142,844
Total loans and loans held for sale, net of unearned income	$	14,305,663		$	188,012		$	—		$	14,493,675
Total assets	19,220,085			256,888			27,095			19,504,068
Total deposits	16,173,831			4,917			—			16,178,748
Average assets	18,146,216			230,819			25,671			18,402,706

	Year Ended December 31, 2014
(Dollars in thousands)	IBERIABANK			IMC			LTC			Consolidated
Interest and dividend income	$	498,820		$	5,992		$	3		$	504,815
Interest expense	42,983			1,721			—			44,704
Net interest income	455,837			4,271			3			460,111
Provision for loan losses	18,966			94			—			19,060
Mortgage income	71			51,726			—			51,797
Title revenue	—			—			20,492			20,492
Other non-interest income	101,401			(61		)	(1		)	101,339
Allocated expenses	(11,602		)	8,203			3,399			—
Non-interest expense	412,165			44,761			16,688			473,614
Income before income tax expense	137,780			2,878			407			141,065
Income tax expense	34,352			1,148			183			35,683
Net income	$	103,428		$	1,730		$	224		$	105,382
Total loans and loans held for sale, net of unearned income	$	11,415,973		$	165,143		$	—		$	11,581,116
Total assets	15,537,731			194,156			26,017			15,757,904
Total deposits	12,515,329			5,196			—			12,520,525
Average assets	14,430,768			176,003			25,223			14,631,994

	Year Ended December 31, 2013
(Dollars in thousands)	IBERIABANK			IMC			LTC		Consolidated
Interest and dividend income	$	431,418		$	5,747		$	32	$	437,197
Interest expense	45,150			1,803			—		46,953
Net interest income	386,268			3,944			32		390,244
Provision for loan losses	5,123			22			—		5,145
Mortgage income	2			64,195			—		64,197
Title revenue	—			—			20,526		20,526
Other non-interest income	84,243			(10		)	2		84,235
Allocated expenses	(7,453		)	5,417			2,036		—
Non-interest expense	406,380			49,723			16,693		472,796
Income before income tax expense	66,463			12,967			1,831		81,261
Income tax expense	10,299			5,093			741		16,133
Net income	$	56,164		$	7,874		$	1,090	$	65,128
Total loans and loans held for sale, net of unearned income	$	9,472,908		$	147,553		$	—	$	9,620,461
Total assets	13,167,162			173,131			25,257		13,365,550
Total deposits	10,734,030			2,970			—		10,737,000
Average assets	12,794,997			183,513			25,478		13,003,988