Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019
Operating Activities
Net income per consolidated statements of income		$ 54,368	$ 75,479
Adjustments to reconcile net income to net cash provided by operating activities:
Credit loss expense, net	[1]	51,791	4,281
Depreciation and amortization		19,656	19,123
Net amortization of securities		4,666	3,918
Gains on sales of loans, net		(30,361)	(9,098)
Compensation expense, long-term incentive plan		2,668	2,281
Deferred income tax provision		(19,500)	(4,400)
Proceeds from sales of loans held for sale		1,133,259	497,187
Purchases and originations of loans held for sale		(1,167,299)	(586,444)
Originations of mortgage servicing rights		(12,396)	(6,075)
Earnings on bank-owned life insurance		(2,544)	(2,715)
Net change in other assets		(45,712)	(14,988)
Net change in other liabilities		(1,491)	(417)
Other operating activities, net		28,447	18,498
Net cash from operating activities		15,552	(3,370)
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity		79,114	85,007
Proceeds from maturities, prepayments and calls of securities available for sale		249,383	213,479
Purchases of securities available for sale		(492,067)	(9,303)
Net proceeds from bank-owned life insurance		592	2,013
Net change in federal funds sold and securities purchased under reverse repurchase agreements		0	(74,669)
Net change in member bank stock		361	(173)
Net change in LHFI and PPP loans		(1,193,397)	(266,949)
Purchases of premises and equipment		(8,638)	(8,372)
Proceeds from sales of premises and equipment		3	2,373
Proceeds from sales of other real estate		10,279	4,105
Purchases of software		(3,179)	(6,861)
Investments in tax credit and other partnerships		(1,612)	(3,426)
Purchase of insurance book of business		(3,097)	(81)
Net cash used in business acquisition		(4,834)	0
Net cash from investing activities		(1,367,092)	(62,857)
Financing Activities
Net change in deposits		2,259,916	202,218
Net change in federal funds purchased and securities sold under repurchase agreements		(185,765)	1,329
Net change in short-term borrowings		4,062	127
Payments on long-term FHLB advances		(34)	(34)
Payments under finance lease obligations		(905)	(1,035)
Common stock dividends		(29,393)	(30,020)
Repurchase and retirement of common stock		(27,538)	(49,901)
Shares withheld to pay taxes, long-term incentive plan		(1,079)	(1,605)
Net cash from financing activities		2,019,264	121,079
Net change in cash and cash equivalents		667,724	54,852
Cash and cash equivalents at beginning of period		358,916	349,561
Cash and cash equivalents at end of period		$ 1,026,640	$ 404,413

[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.