Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net income per consolidated statements of income		$ 22,218	$ 33,339
Adjustments to reconcile net income to net cash provided by operating activities:
Credit loss expense, net	[1]	27,364	1,689
Depreciation and amortization		8,996	9,337
Net amortization of securities		1,918	2,007
Gains on sales of loans, net		(7,085)	(3,576)
Compensation expense, long-term incentive plan		1,394	1,002
Deferred income tax provision		(11,600)	(1,400)
Proceeds from sales of loans held for sale		324,167	212,508
Purchases and originations of loans held for sale		(416,687)	(235,550)
Originations of mortgage servicing rights		(3,649)	(2,507)
Earnings on bank-owned life insurance		(1,292)	(1,354)
Net change in other assets		(49,822)	(1,576)
Net change in other liabilities		(204)	(9,853)
Other operating activities, net		25,119	10,806
Net cash from operating activities		(79,163)	14,872
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity		34,459	25,361
Proceeds from maturities, prepayments and calls of securities available for sale		86,129	106,990
Purchases of securities available for sale		(278,691)	0
Net proceeds from bank-owned life insurance		280	0
Net change in federal funds sold and securities purchased under reverse repurchase agreements		(2,000)	830
Net change in member bank stock		(107)	(70)
Net change in loans		(162,097)	(148,108)
Purchases of premises and equipment		(4,154)	(4,407)
Proceeds from sales of premises and equipment		0	1,848
Proceeds from sales of other real estate		3,671	1,780
Purchases of software		(1,805)	(3,753)
Investments in tax credit and other partnerships		(141)	(3,426)
Purchase of insurance book of business		(3,097)	(81)
Net cash from investing activities		(327,553)	(23,036)
Financing Activities
Net change in deposits		330,207	170,404
Net change in federal funds purchased and securities sold under repurchase agreements		165,801	(3,604)
Net change in short-term borrowings		(127)	(90)
Payments on long-term FHLB advances		(17)	(17)
Payments under finance lease obligations		(459)	(513)
Common stock dividends		(14,706)	(15,033)
Repurchase and retirement of common stock		(27,538)	(36,893)
Shares withheld to pay taxes, long-term incentive plan		(1,020)	(1,604)
Net cash from financing activities		452,141	112,650
Net change in cash and cash equivalents		45,425	104,486
Cash and cash equivalents at beginning of period		358,916	349,561
Cash and cash equivalents at end of period		$ 404,341	$ 454,047

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.