Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Operating Activities
Net income per consolidated statements of income	$ 112,896	$ 89,862
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses, net	15,043	3,533
Depreciation and amortization	29,512	28,781
Net amortization of securities	7,197	8,084
Securities (gains) losses, net	0	(15)	[1]
Gains on sales of loans, net	(16,409)	(13,633)
Deferred income tax provision	5,612	4,800
Proceeds from sales of loans held for sale	836,971	885,520
Purchases and originations of loans held for sale	(823,134)	(895,992)
Originations of mortgage servicing rights	(12,248)	(11,630)
Earnings on bank-owned life insurance	(3,994)	(3,753)
Net change in other assets	521	29,599
Net change in other liabilities	14	4,205
Other operating activities, net	(10,268)	6,280
Net cash provided by operating activities	141,713	135,641
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity	114,531	128,515
Proceeds from maturities, prepayments and calls of securities available for sale	334,852	351,817
Proceeds from sales of securities available for sale	0	27,682
Purchases of securities held to maturity	0	(69,989)
Purchases of securities available for sale	(14,040)	(338,532)
Net proceeds from bank-owned life insurance	1,843	3,630
Net change in federal funds sold and securities purchased under reverse repurchase agreements	(385)	4,185
Net change in member bank stock	26,970	739
Net change in loans	(63,796)	(457,292)
Purchases of premises and equipment	(10,870)	(10,963)
Proceeds from sales of premises and equipment	651	7,792
Proceeds from sales of other real estate	16,490	20,301
Purchases of software	(10,701)	(3,492)
Investments in tax credit and other partnerships	(17)	(5,213)
Net cash used in business acquisition	0	(19,775)
Net cash provided by (used in) investing activities	395,528	(360,595)
Financing Activities
Net change in deposits	379,398	9,572
Net change in federal funds purchased and securities sold under repurchase agreements	17,038	5,786
Net change in short-term borrowings	(780,606)	283,820
Payments on long-term FHLB advances	(50)	(49)
Redemption of junior subordinated debt securities	0	(3,000)
Common stock dividends	(47,014)	(47,099)
Repurchase and retirement of common stock	(7,877)	0
Shares withheld to pay taxes, long-term incentive plan	(1,427)	(1,659)
Net cash provided by (used in) financing activities	(440,538)	247,371
Net change in cash and cash equivalents	96,703	22,417
Cash and cash equivalents at beginning of period	335,768	327,706
Cash and cash equivalents at end of period	$ 432,471	$ 350,123

[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.