Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Interest Income
Interest and fees on LHFS & LHFI	$ 395,969	$ 344,625		$ 299,645
Interest and fees on acquired loans	17,115	24,478		30,144
Interest on securities:
Taxable	66,082	76,192		77,614
Tax exempt	2,236	3,001		3,675
Interest on federal funds sold and securities purchased under reverse repurchase agreements	14	33		14
Other interest income	4,196	1,466		988
Total Interest Income	485,612	449,795		412,080
Interest Expense
Interest on deposits	53,936	22,717		12,748
Interest on federal funds purchased and securities sold under repurchase agreements	4,788	4,152		1,717
Other interest expense	7,468	15,376		10,082
Total Interest Expense	66,192	42,245		24,547
Net Interest Income	419,420	407,550		387,533
Provision for loan losses, LHFI	17,993	15,094		10,957
Provision for loan losses, acquired loans	(1,005)	(7,395)		3,757
Net Interest Income After Provision for Loan Losses	402,432	399,851		372,819
Noninterest Income
Service charges on deposit accounts	43,702	44,003	[1]	45,253	[1]
Bank card and other fees	28,905	28,286	[1]	27,906	[1]
Mortgage banking, net	34,674	29,902	[1]	28,212	[1]
Insurance commissions	40,481	38,168	[1]	36,764	[1]
Wealth management	30,338	30,340	[1]	30,492	[1]
Other, net	6,736	13,949	[1]	5,626	[1]
Securities gains (losses), net	0	15	[1]	(310)	[1]
Total Noninterest Income	184,836	184,663	[1]	173,943	[1]
Noninterest Expense
Salaries and employee benefits	238,033	229,265		229,250
Defined benefit plan termination		17,644
Services and fees	66,382	60,893		58,695
Net occupancy - premises	26,703	25,767		24,982
Equipment expense	24,830	24,453		24,225
Other real estate expense	2,002	3,672		586
FDIC assessment expense	9,429	11,010		11,243
Other expense	48,036	57,465		58,317
Total Noninterest Expense	415,415	430,169		407,298
Income Before Income Taxes	171,853	154,345		139,464
Income taxes	22,269	48,715		31,053
Net Income	$ 149,584	$ 105,630		$ 108,411
Earnings Per Share
Basic	$ 2.22	$ 1.56		$ 1.60
Diluted	$ 2.21	$ 1.56		$ 1.60

[1] Trustmark elected the modified retrospective approach of adoption; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current year presentation.