Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net income per consolidated statements of income	$ 150,460	$ 149,584	$ 105,630
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses, net	10,839	16,988	7,699
Depreciation and amortization	39,420	38,940	38,471
Net amortization of securities	7,789	9,181	10,964
Securities (gains) losses, net	0	0	(15)	[1],[2]
Gains on sales of loans, net	(27,301)	(21,615)	(18,933)
Compensation expense, long-term incentive plan	4,787	3,870	4,309
Deferred income tax provision	(3,880)	11,740	26,068
Proceeds from sales of loans held for sale	1,431,003	1,114,020	1,197,821
Purchases and originations of loans held for sale	(1,480,752)	(1,052,339)	(1,179,187)
Originations of mortgage servicing rights	(16,711)	(15,759)	(15,860)
Earnings on bank-owned life insurance	(5,592)	(5,358)	(5,025)
Net change in other assets	(30,729)	(1,891)	23,451
Net change in other liabilities	13,276	(1,277)	9,093
Other operating activities, net	23,838	(6,886)	2,121
Net cash from operating activities	116,447	239,198	206,607
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity	173,385	149,308	174,976
Proceeds from maturities, prepayments and calls of securities available for sale	425,260	423,617	467,194
Proceeds from sales of securities available for sale	0	0	27,682
Purchases of securities held to maturity	0	0	(69,989)
Purchases of securities available for sale	(177,739)	(23,901)	(346,159)
Net proceeds from bank-owned life insurance	4,140	1,824	3,623
Net change in federal funds sold and securities purchased under reverse repurchase agreements	830	(215)	6,785
Net change in member bank stock	262	35,451	4,474
Net change in loans	(480,295)	(140,710)	(608,886)
Purchases of premises and equipment	(17,327)	(14,644)	(13,219)
Proceeds from sales of premises and equipment	3,248	772	8,377
Proceeds from sales of other real estate	11,182	20,502	26,849
Purchases of software	(13,412)	(13,195)	(5,498)
Investments in tax credit and other partnerships	(3,426)	(22)	(5,296)
Purchase of insurance book of business	(347)	0	0
Net cash used in business acquisition	0	0	(19,775)
Net cash from investing activities	(74,239)	438,787	(348,862)
Financing Activities
Net change in deposits	(118,854)	786,899	355,342
Net change in federal funds purchased and securities sold under repurchase agreements	205,549	(419,356)	(69,990)
Net change in short-term borrowings	561	(905,396)	(67,451)
Payments on long-term FHLB advances	(68)	(67)	(65)
Payments under finance lease obligations	(1,964)	0	0
Redemption of junior subordinated debt securities	0	0	(3,000)
Common stock dividends	(59,804)	(62,425)	(62,795)
Repurchase and retirement of common stock	(56,615)	(62,421)	0
Shares withheld to pay taxes, long-term incentive plan	(1,658)	(1,426)	(1,724)
Net cash from financing activities	(32,853)	(664,192)	150,317
Net change in cash and cash equivalents	9,355	13,793	8,062
Cash and cash equivalents at beginning of year	349,561	335,768	327,706
Cash and cash equivalents at end of year	$ 358,916	$ 349,561	$ 335,768

[1] During the first quarter of 2019, Trustmark revised the composition of its operating segments by moving the Private Banking Group from the General Banking Segment to the Wealth Management Segment as a result of a change in supervision of this group for segment reporting purposes.  The prior period amounts presented include reclassifications to conform to the current period presentation.

[2] 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.