Business Segments (Tables)

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Schedule of Segment Reporting Information

	Three Months Ended September 30, 2016
(Dollars in thousands)	IBERIABANK			IMC		LTC		Consolidated
Interest and dividend income	$	178,521		$	1,982	$	1	$	180,504
Interest expense	15,944			1,143		—		17,087
Net interest income	162,577			839		1		163,417
Provision for loan losses	12,443			41		—		12,484
Mortgage income	850			20,957		—		21,807
Service charges on deposit accounts	11,066			—		—		11,066
Title revenue	—			—		6,001		6,001
Other non-interest income	20,946			1		—		20,947
Allocated expenses	(3,914		)	3,010		904		—
Non-interest expense	127,690			5,891		4,558		138,139
Income before income tax expense	59,220			12,855		540		72,615
Income tax expense	19,282			5,048		217		24,547
Net income	$	39,938		$	7,807	$	323	$	48,068
Total loans and loans held for sale, net of unearned income	$	14,957,337		$	178,028	$	—	$	15,135,365
Total assets	20,537,304			226,906		24,356		20,788,566
Total deposits	16,513,867			8,650		—		16,522,517
Average assets	20,061,071			305,996		25,761		20,392,828

	Three Months Ended September 30, 2015
(Dollars in thousands)	IBERIABANK			IMC		LTC		Consolidated
Interest and dividend income	$	169,005		$	2,071	$	1	$	171,077
Interest expense	15,109			851		—		15,960
Net interest income	153,896			1,220		1		155,117
Provision for loan losses	5,062			—		—		5,062
Mortgage income	263			20,365		—		20,628
Service charges on deposit accounts	11,342			—		—		11,342
Title revenue	—			—		6,627		6,627
Other non-interest income	18,880			1		—		18,881
Allocated expenses	(3,518		)	2,693		825		—
Non-interest expense	124,909			15,605		4,454		144,968
Income before income tax expense	57,928			3,288		1,349		62,565
Income tax expense	18,253			1,306		531		20,090
Net income	$	39,675		$	1,982	$	818	$	42,475
Total loans and loans held for sale, net of unearned income	$	14,094,936		$	224,251	$	—	$	14,319,187
Total assets	19,242,690			264,914		26,621		19,534,225
Total deposits	16,293,681			9,384		—		16,303,065
Average assets	19,321,164			256,897		26,009		19,604,070

	Nine Months Ended September 30, 2016
(Dollars in thousands)	IBERIABANK			IMC		LTC		Consolidated
Interest and dividend income	$	530,409		$	5,723	$	2	$	536,134
Interest expense	45,380			3,181		—		48,561
Net interest income	485,029			2,542		2		487,573
Provision for loan losses	39,214			41		—		39,255
Mortgage income	856			66,882		—		67,738
Service charges on deposit accounts	32,957			—		—		32,957
Title revenue	—			—		16,881		16,881
Other non-interest income	62,999			8		—		63,007
Allocated expenses	(10,468		)	8,007		2,461		—
Non-interest expense	367,985			33,909		13,201		415,095
Income before income tax expense	185,110			27,475		1,221		213,806
Income tax expense	60,841			10,826		492		72,159
Net income	$	124,269		$	16,649	$	729	$	141,647
Total loans and loans held for sale, net of unearned income	$	14,957,337		$	178,028	$	—	$	15,135,365
Total assets	20,537,304			226,906		24,356		20,788,566
Total deposits	16,513,867			8,650		—		16,522,517
Average assets	19,705,052			289,037		26,626		20,020,715

	Nine Months Ended September 30, 2015
(Dollars in thousands)	IBERIABANK			IMC			LTC			Consolidated
Interest and dividend income	$	464,775		$	5,430		$	2		$	470,207
Interest expense	41,410			2,199			—			43,609
Net interest income	423,365			3,231			2			426,598
Provision for loan losses	19,197			—			—			19,197
Mortgage income	830			63,067			—			63,897
Service charges on deposit accounts	30,766			—			—			30,766
Title revenue	—			—			17,402			17,402
Other non-interest income	55,834			(2		)	(7		)	55,825
Allocated expenses	(11,603		)	8,685			2,918			—
Non-interest expense	373,948			44,259			13,123			431,330
Income before income tax expense	129,253			13,352			1,356			143,961
Income tax expense	39,695			5,286			543			45,524
Net income	$	89,558		$	8,066		$	813		$	98,437
Total loans and loans held for sale, net of unearned income	$	14,094,936		$	224,251		$	—		$	14,319,187
Total assets	19,242,690			264,914			26,621			19,534,225
Total deposits	16,293,681			9,384			—			16,303,065
Average assets	17,760,033			230,379			25,268			18,015,680