Trustmark (TRMK) 10-Q 5 Aug 21 2021 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2021	Jul. 30, 2021
Cover [Abstract]
Entity Registrant Name	Trustmark Corp
Entity Central Index Key	0000036146
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		62,454,967
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2021
Trading Symbol	TRMK
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock, no par value
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity File Number	000-03683
Entity Incorporation, State or Country Code	MS
Entity Tax Identification Number	64-0471500
Entity Address, Address Line One	248 East Capitol Street
Entity Address, City or Town	Jackson
Entity Address, State or Province	MS
Entity Address, Postal Zip Code	39201
City Area Code	601
Local Phone Number	208-5111
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 2,267,224	$ 1,952,504
Federal funds sold and securities purchased under reverse repurchase agreements		50
Securities available for sale, at fair value (amortized cost: $2,531,885 - 2021 $1,959,773 - 2020; allowance for credit losses: $0)	2,548,739	1,991,815
Securities held to maturity, net of allowance for credit losses of $0 (fair value: $452,288 - 2021; $563,115 - 2020)	433,012	538,072
Paycheck Protection Program (PPP) loans	166,119	610,134
Loans held for sale (LHFS)	332,132	446,951
Loans held for investment (LHFI)	10,152,869	9,824,524
Less allowance for credit losses (ACL), LHFI	104,032	117,306
Net LHFI	10,048,837	9,707,218
Premises and equipment, net	200,970	194,278
Mortgage servicing rights	80,764	66,464
Goodwill	384,237	385,270
Identifiable intangible assets, net	6,170	7,390
Other real estate, net	9,439	11,651
Operating lease right-of-use assets	33,201	30,901
Other assets	587,288	609,142
Total Assets	17,098,132	16,551,840
Deposits:
Noninterest-bearing	4,446,991	4,349,010
Interest-bearing	10,185,093	9,699,754
Total deposits	14,632,084	14,048,764
Federal funds purchased and securities sold under repurchase agreements	157,176	164,519
Other borrowings	117,223	168,252
Subordinated notes	122,932	122,921
Junior subordinated debt securities	61,856	61,856
ACL on off-balance sheet credit exposures	33,733	38,572
Operating lease liabilities	34,959	32,290
Other liabilities	158,860	173,549
Total Liabilities	15,318,823	14,810,723
Shareholders' Equity
Common stock, no par value: Authorized: 250,000,000 shares Issued and outstanding: 62,773,226 shares - 2021; 63,424,526 shares - 2020	13,079	13,215
Capital surplus	210,420	233,120
Retained earnings	1,566,451	1,495,833
Accumulated other comprehensive income (loss), net of tax	(10,641)	(1,051)
Total Shareholders' Equity	1,779,309	1,741,117
Total Liabilities and Shareholders' Equity	$ 17,098,132	$ 16,551,840

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Assets
Securities available-for-sale, amortized cost	$ 2,531,885,000	$ 1,959,773,000
Securities available-for-sale, allowance for credit Losses	0	0
Securities held to maturity, net of allowance for credit losses	0	0
Securities held to maturity, fair value	$ 452,288,000	$ 563,115,000
Shareholders' Equity
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, authorized (in shares)	250,000,000	250,000,000
Common stock, issued (in shares)	62,773,226	63,424,526
Common stock, outstanding (in shares)	62,773,226	63,424,526

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest Income
Interest and fees on LHFS & LHFI		$ 90,772	$ 96,359	$ 181,333	$ 202,704
Interest and fees on PPP loans		25,555	5,044	34,796	5,044
Interest on securities:
Taxable		8,991	12,762	17,929	25,710
Tax exempt		118	249	347	610
Other interest income		489	239	992	979
Total Interest Income		125,925	114,653	235,397	235,047
Interest Expense
Interest on deposits		4,630	8,730	9,853	23,687
Interest on federal funds purchased and securities sold under repurchase agreements		59	42	115	667
Other interest expense		1,813	881	3,670	1,741
Total Interest Expense		6,502	9,653	13,638	26,095
Net Interest Income		119,423	105,000	221,759	208,952
Provision for credit losses, LHFI (PCL)		(3,991)	18,185	(14,492)	38,766
PCL, off-balance sheet credit exposures	[1]	4,528	6,242	(4,839)	13,025
Net Interest Income After PCL		118,886	80,573	241,090	157,161
Noninterest Income
Service charges on deposit accounts		7,613	6,397	14,969	16,429
Bank card and other fees		8,301	7,717	17,773	13,072
Mortgage banking, net		17,333	33,745	38,137	61,228
Insurance commissions		12,217	11,868	24,662	23,418
Wealth management		8,946	7,571	17,362	16,108
Other, net		2,001	2,213	4,091	4,520
Total Noninterest Income		56,411	69,511	116,994	134,775
Noninterest Expense
Salaries and employee benefits		70,115	66,107	141,277	135,255
Services and fees		21,769	20,567	44,253	40,497
Net occupancy - premises		6,578	6,587	13,373	12,873
Equipment expense		5,567	5,620	11,811	11,236
Other real estate expense, net		1,511	271	1,835	1,565
Other expense		13,139	13,265	27,678	28,018
Total Noninterest Expense	[2]	118,679	112,417	240,227	229,444
Income Before Income Taxes		56,618	37,667	117,857	62,492
Income taxes		8,637	5,517	17,914	8,124
Net Income		$ 47,981	$ 32,150	$ 99,943	$ 54,368
Earnings Per Share
Basic		$ 0.76	$ 0.51	$ 1.58	$ 0.86
Diluted		$ 0.76	$ 0.51	$ 1.57	$ 0.85
[1]	During the second quarter of 2021, Trustmark reclassified its credit loss expense related to off-balance sheet credit exposures from noninterest expense to provision for credit losses, off-balance sheet credit exposures. Prior periods have been reclassified accordingly.
[2]	During the second quarter of 2021, Trustmark reclassified its credit loss expense related to off-balance sheet credit exposures from noninterest expense to provision for credit losses, off-balance sheet credit exposures. Prior periods have been reclassified accordingly

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income per consolidated statements of income	$ 47,981	$ 32,150	$ 99,943	$ 54,368
Net unrealized gains (losses) on available for sale securities and transferred securities:
Net unrealized holding gains (losses) arising during the period	4,959	1,986	(11,391)	32,366
Change in net unrealized holding loss on securities transferred to held to maturity	552	583	1,085	1,229
Reclassification adjustments for changes realized in net income:
Net change in prior service costs	21	28	42	56
Recognized net loss due to lump sum settlement	0	30	0	30
Change in net actuarial loss	333	240	674	484
Other comprehensive income (loss), net of tax	5,865	2,867	(9,590)	34,165
Comprehensive income	$ 53,846	$ 35,017	$ 90,353	$ 88,533

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Cumulative Effect Period Of Adoption Adjustment [Member]	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Retained Earnings [Member]Cumulative Effect Period Of Adoption Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2019	$ 1,660,702	$ (19,949)	$ 13,376	$ 256,400	$ 1,414,526	$ (19,949)	$ (23,600)
Balance (in shares) at Dec. 31, 2019			64,200,111
Accounting standards update [Extensible List]	ASU 2016-13 [Member]
Net income per consolidated statements of income	$ 22,218				22,218
Other comprehensive income (loss), net of tax	31,298						31,298
Common stock dividends paid ($0.23 per share)	(14,706)				(14,706)
Shares withheld to pay taxes, long-term incentive plan	(1,020)		$ 17	(1,037)
Shares withheld to pay taxes, long-term incentive plan (in shares)			83,759
Repurchase and retirement of common stock	(27,538)		$ (184)	(27,354)
Repurchase and retirement of common stock (in shares)			(886,958)
Compensation expense, long-term incentive plan	1,394			1,394
Balance at Mar. 31, 2020	1,652,399		$ 13,209	229,403	1,402,089		7,698
Balance (in shares) at Mar. 31, 2020			63,396,912
Balance at Dec. 31, 2019	1,660,702	$ (19,949)	$ 13,376	256,400	1,414,526	$ (19,949)	(23,600)
Balance (in shares) at Dec. 31, 2019			64,200,111
Net income per consolidated statements of income	54,368
Other comprehensive income (loss), net of tax	34,165
Balance at Jun. 30, 2020	1,673,944		$ 13,214	230,613	1,419,552		10,565
Balance (in shares) at Jun. 30, 2020			63,422,439
Balance at Mar. 31, 2020	1,652,399		$ 13,209	229,403	1,402,089		7,698
Balance (in shares) at Mar. 31, 2020			63,396,912
Net income per consolidated statements of income	32,150				32,150
Other comprehensive income (loss), net of tax	2,867						2,867
Common stock dividends paid ($0.23 per share)	(14,687)				(14,687)
Shares withheld to pay taxes, long-term incentive plan	(59)		$ 5	(64)
Shares withheld to pay taxes, long-term incentive plan (in shares)			25,527
Compensation expense, long-term incentive plan	1,274			1,274
Balance at Jun. 30, 2020	1,673,944		$ 13,214	230,613	1,419,552		10,565
Balance (in shares) at Jun. 30, 2020			63,422,439
Balance at Dec. 31, 2020	$ 1,741,117		$ 13,215	233,120	1,495,833		(1,051)
Balance (in shares) at Dec. 31, 2020	63,424,526		63,424,526
Net income per consolidated statements of income	$ 51,962				51,962
Other comprehensive income (loss), net of tax	(15,455)						(15,455)
Common stock dividends paid ($0.23 per share)	(14,685)				(14,685)
Shares withheld to pay taxes, long-term incentive plan	(1,230)		$ 24	(1,254)
Shares withheld to pay taxes, long-term incentive plan (in shares)			114,977
Repurchase and retirement of common stock	(4,185)		$ (30)	(4,155)
Repurchase and retirement of common stock (in shares)			(144,981)
Compensation expense, long-term incentive plan	2,181			2,181
Balance at Mar. 31, 2021	1,759,705		$ 13,209	229,892	1,533,110		(16,506)
Balance (in shares) at Mar. 31, 2021			63,394,522
Balance at Dec. 31, 2020	$ 1,741,117		$ 13,215	233,120	1,495,833		(1,051)
Balance (in shares) at Dec. 31, 2020	63,424,526		63,424,526
Net income per consolidated statements of income	$ 99,943
Other comprehensive income (loss), net of tax	(9,590)
Balance at Jun. 30, 2021	$ 1,779,309		$ 13,079	210,420	1,566,451		(10,641)
Balance (in shares) at Jun. 30, 2021	62,773,226		62,773,226
Balance at Mar. 31, 2021	$ 1,759,705		$ 13,209	229,892	1,533,110		(16,506)
Balance (in shares) at Mar. 31, 2021			63,394,522
Net income per consolidated statements of income	47,981				47,981
Other comprehensive income (loss), net of tax	5,865						5,865
Common stock dividends paid ($0.23 per share)	(14,640)				(14,640)
Shares withheld to pay taxes, long-term incentive plan	(11)		$ 2	(13)
Shares withheld to pay taxes, long-term incentive plan (in shares)			8,524
Repurchase and retirement of common stock	(20,805)		$ (132)	(20,673)
Repurchase and retirement of common stock (in shares)			(629,820)
Compensation expense, long-term incentive plan	1,214			1,214
Balance at Jun. 30, 2021	$ 1,779,309		$ 13,079	$ 210,420	$ 1,566,451		$ (10,641)
Balance (in shares) at Jun. 30, 2021	62,773,226		62,773,226

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Statement Of Stockholders Equity [Abstract]
Cash dividends paid on common stock (in dollars per share)	$ 0.23	$ 0.23	$ 0.23	$ 0.23

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating Activities
Net income per consolidated statements of income	$ 99,943	$ 54,368
Adjustments to reconcile net income to net cash provided by operating activities:
Credit loss expense, net	(19,331)	51,791
Depreciation and amortization	22,428	19,656
Net amortization of securities	10,780	4,666
Gains on sales of loans, net	(45,625)	(30,361)
Compensation expense, long-term incentive plan	3,395	2,668
Deferred income tax provision	12,500	(19,500)
Proceeds from sales of loans held for sale	1,334,752	1,133,259
Purchases and originations of loans held for sale	(1,220,055)	(1,167,299)
Originations of mortgage servicing rights	(15,201)	(12,396)
Earnings on bank-owned life insurance	(2,418)	(2,544)
Net change in other assets	23,623	(45,712)
Net change in other liabilities	(9,802)	(1,491)
Other operating activities, net	(6,871)	28,447
Net cash from operating activities	188,118	15,552
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity	105,814	79,114
Proceeds from maturities, prepayments and calls of securities available for sale	442,450	249,383
Purchases of securities available for sale	(1,024,649)	(492,067)
Net proceeds from bank-owned life insurance	1,791	592
Net change in federal funds sold and securities purchased under reverse repurchase agreements	50	0
Net change in member bank stock	(1,037)	361
Net change in LHFI and PPP loans	(237,666)	(1,193,397)
Proceeds from sales of PPP loans	353,287	0
Purchases of premises and equipment	(13,920)	(8,638)
Proceeds from sales of premises and equipment	0	3
Proceeds from sales of other real estate	1,167	10,279
Purchases of software	(2,336)	(3,179)
Investments in tax credit and other partnerships	(13,396)	(1,612)
Purchase of insurance book of business	0	(3,097)
Net cash used in business acquisition	0	(4,834)
Net cash from investing activities	(388,445)	(1,367,092)
Financing Activities
Net change in deposits	583,320	2,259,916
Net change in federal funds purchased and securities sold under repurchase agreements	(7,343)	(185,765)
Net change in short-term borrowings	(4,653)	4,062
Payments on long-term FHLB advances	(9)	(34)
Payments under finance lease obligations	(712)	(905)
Common stock dividends	(29,325)	(29,393)
Repurchase and retirement of common stock	(24,990)	(27,538)
Shares withheld to pay taxes, long-term incentive plan	(1,241)	(1,079)
Net cash from financing activities	515,047	2,019,264
Net change in cash and cash equivalents	314,720	667,724
Cash and cash equivalents at beginning of period	1,952,504	358,916
Cash and cash equivalents at end of period	$ 2,267,224	$ 1,026,640

Business, Basis of Financial St

Business, Basis of Financial Statement Presentation and Principles of Consolidation	6 Months Ended
	Jun. 30, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Business, Basis of Financial Statement Presentation and Principles of Consolidation	Note 1 – Business, Basis of Financial Statement Presentation and Principles of Consolidation Trustmark Corporation (Trustmark) is a bank holding company headquartered in Jackson, Mississippi. Through its subsidiaries, Trustmark operates as a financial services organization providing banking and financial solutions to corporate institutions and individual customers through 180 offices at June 30, 2021 in Alabama, Florida, Mississippi, Tennessee and Texas. The consolidated financial statements include the accounts of Trustmark and all other entities in which Trustmark has a controlling financial interest. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain reclassifications have been made to prior period amounts to conform to the current period presentation. The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements, and notes thereto, included in Trustmark’s Annual Report on Form 10-K for its fiscal year ended December 31, 2020 (2020 Annual Report). Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period. In the opinion of Management, all adjustments (consisting of normal recurring accruals) considered necessary for the fair presentation of these consolidated financial statements have been included. The preparation of financial statements in conformity with these accounting principles requires Management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and income and expense during the reporting periods and the related disclosures. Although Management’s estimates contemplate current conditions and how they are expected to change in the future, it is reasonably possible that in 2021 actual conditions could vary from those anticipated, which could affect Trustmark’s financial condition and results of operations. Actual results could differ from those estimates. Coronavirus 2019 (COVID-19) Pandemic On March 11, 2020, the World Health Organization declared COVID-19, the disease caused by the novel coronavirus, a pandemic as a result of the global spread of the coronavirus illness. The COVID-19 pandemic has adversely affected, and may continue to adversely affect economic activity globally, nationally and locally. In response to the pandemic, federal and state authorities in the United States introduced various measures to try to limit or slow the spread of the virus, including travel restrictions, nonessential business closures, stay-at-home orders, and strict social distancing. The full impact of the COVID-19 pandemic is unknown and rapidly evolving. It has caused substantial disruption in international and U.S. economies, markets, and employment. The COVID-19 pandemic may continue to have a significant adverse impact on certain industries Trustmark serves, including restaurants and food services, hotels, retail and energy. Because of the significant uncertainties related to the ultimate duration of the COVID-19 pandemic and its potential effects on customers and prospects, and on the national and local economy as a whole, there can be no assurances as to how the crisis may ultimately affect Trustmark’s loan portfolio. It is unknown how long the adverse conditions associated with the COVID-19 pandemic will last and what the complete financial effect will be to Trustmark. It is reasonably possible that estimates made in the financial statements could be materially and adversely impacted in the near term as a result of these conditions, including expected credit losses on loans and off-balance sheet credit exposures. See Note 3 – LHFI and Allowance for Credit Losses, LHFI for information regarding the impact of COVID-19 on Trustmark’s loan portfolio. Paycheck Protection Program (PPP) Loans On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act), a stimulus package intended to provide relief to businesses and consumers in the United States struggling as a result of the pandemic, was signed into law. A provision in the CARES Act included an initial $349 billion fund for the creation of the PPP through the Small Business Administration (SBA) and Treasury Department. The PPP is intended to provide loans to small businesses, sole proprietorships, independent contractors and self-employed individuals to pay their employees, rent, mortgage interest and utilities. PPP loans are forgivable, in whole or in part, if the proceeds are used for payroll and other permitted purposes in accordance with the requirements of the PPP. If not forgiven, in whole or in part, these loans carry a fixed rate of 1.00% per annum with payments deferred until the date the SBA remits the borrower’s loan forgiveness amount to the lender (or, if the borrower does not apply for loan forgiveness, ten months after the end of the borrower’s loan forgiveness covered period). Originally, the loans carried a term of two years under SBA rules implement ing the CARES Act, but a June 5, 2020 amendment to the CARES Act provided for a five-year minimum loan term for loans made beginning as of such date, and permitted lenders and borrowers to mutually agree to amend existing two-year loans to have terms of five years . The loans are 100% guaranteed by the SBA. Subsequent legislation, including as noted below, has allocated additional funding to the PPP. The SBA pays the originating bank a processing fee ranging from 1.0% to 5.0% , based on the size of the loan. From April to August 2020, Trustmark accepted PPP applications and originated loans to qualified small businesses and other borrowers under this program. The SBA stopped accepting applications for PPP loans on August 8, 2020. The Consolidated Appropriations Act, 2021, enacted on December 27, 2020, extended some of the relief provisions in certain respects of the CARES Act, appropriated additional funding to the PPP and permitted certain PPP borrowers to make “second draw” loans. The American Rescue Plan Act of 2021, enacted on March 11, 2021, expanded the eligibility criteria for both first and second draw PPP loans and revised the exclusions from payroll costs for purposes of loan forgiveness. The PPP Extension Act of 2021, enacted on March 30, 2021, extended the PPP through May 31, 2021. In January 2021, Trustmark resumed submitting applications to the SBA on behalf of and originating loans to qualified small businesses and other borrowers under the CARES Act, as amended by the Consolidated Appropriations Act, 2021. During the first six months of 2021, Trustmark originated 5,727 PPP loans totaling $354.5 million (net of $21.7 million of deferred fees and costs). On June 30, 2021, Trustmark announced the sale of substantially all PPP loans originated in 2021 by its wholly owned subsidiary, Trustmark National Bank (TNB), to The Loan Source, Inc. (Loan Source), a firm with significant expertise in PPP loans. As a result of this transaction, Loan Source will assume responsibility for the servicing and forgiveness process for the loans it has acquired from Trustmark. This transaction will allow Trustmark to focus on more traditional lending efforts and increase its ability to provide customers with financial services in an improving economic environment. Trustmark accelerated the recognition of unamortized PPP loan origination fees, net of cost, of approximately $18.6 million, in the second quarter of 2021 due to the sale of approximately $354.2 million in PPP loans. This revenue is substantially the same as Trustmark would expect to recognize upon the maturity or forgiveness of the PPP loans being sold in this transaction, and thus this transaction serves to accelerate revenue anticipated in future periods into the second quarter. At June 30, 2021, Trustmark had 843 PPP loans outstanding that totaled $166.1 million (net of $2.1 million of deferred fees and costs). Due to the amount and nature of the PPP loans, these loans are not included in the LHFI portfolio and are presented separately in the accompanying consolidated balance sheet. The PPP loans are fully guaranteed by the SBA; therefore, no ACL was estimated for these loans.

Securities Available for Sale a

Securities Available for Sale and Held to Maturity	6 Months Ended
	Jun. 30, 2021
Investments Debt And Equity Securities [Abstract]
Securities Available for Sale and Held to Maturity	Note 2 – Securities Available for Sale and Held to Maturity The following tables are a summary of the amortized cost and estimated fair value of securities available for sale and held to maturity at June 30, 2021 and December 31, 2020 ($ in thousands): Securities Available for Sale Securities Held to Maturity June 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. Treasury securities $ 29,988 $ 37 $ — $ 30,025 $ — $ — $ — $ — U.S. Government agency obligations 16,289 121 (387 ) 16,023 — — — — Obligations of states and political subdivisions 5,167 640 — 5,807 12,994 117 (5 ) 13,106 Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 47,365 1,091 (11 ) 48,445 6,249 289 — 6,538 Issued by FNMA and FHLMC 1,975,328 15,621 (7,166 ) 1,983,783 53,406 1,773 — 55,179 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 277,411 6,620 (43 ) 283,988 291,477 15,470 (38 ) 306,909 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 180,337 861 (530 ) 180,668 68,886 1,670 — 70,556 Total $ 2,531,885 $ 24,991 $ (8,137 ) $ 2,548,739 $ 433,012 $ 19,319 $ (43 ) $ 452,288 December 31, 2020 U.S. Government agency obligations $ 18,378 $ 144 $ (481 ) $ 18,041 $ — $ — $ — $ — Obligations of states and political subdivisions 5,198 637 — 5,835 26,584 258 (3 ) 26,839 Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 55,193 1,672 (3 ) 56,862 7,598 382 — 7,980 Issued by FNMA and FHLMC 1,421,861 20,768 (1,308 ) 1,441,321 67,944 2,397 — 70,341 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 409,883 9,600 (46 ) 419,437 360,361 19,678 (55 ) 379,984 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 49,260 1,068 (9 ) 50,319 75,585 2,386 — 77,971 Total $ 1,959,773 $ 33,889 $ (1,847 ) $ 1,991,815 $ 538,072 $ 25,101 $ (58 ) $ 563,115 During 2013, Trustmark reclassified approximately $1.099 billion of securities available for sale to securities held to maturity. The securities were transferred at fair value, which became the cost basis for the securities held to maturity. At the date of transfer, the net unrealized holding loss on the available for sale securities totaled approximately $46.6 million ($28.8 million, net of tax). The net unrealized holding loss is amortized over the remaining life of the securities as a yield adjustment in a manner consistent with the amortization or accretion of the original purchase premium or discount on the associated security. There were no gains or losses recognized as a result of the transfer. At June 30, 2021, the net unamortized, unrealized loss on the transferred securities included in accumulated other comprehensive income (loss) in the accompanying balance sheet totaled approximately $7.5 million ($5.6 million, net of tax) compared to approximately $8.9 million ($6.7 million, net of tax) at December 31, 2020. ACL on Securities Securities Available for Sale Quarterly, Trustmark evaluates if any security has a fair value less than its amortized cost. Once these securities are identified, in order to determine whether a decline in fair value resulted from a credit loss or other factors, Trustmark performs further analysis. If Trustmark determines that a credit loss exists, the credit portion of the allowance is measured using a discounted cash flow (DCF) analysis using the effective interest rate as of the security’s purchase date. The amount of credit loss Trustmark records will be limited to the amount by which the amortized cost exceeds the fair value. The DCF analysis utilizes contractual maturities, as well as third-party credit ratings and cumulative default rates published annually by Moody’s Investor Service (Moody’s). At both June 30, 2021 and December 31, 2020, the results of the analysis did not identify any securities that violate the credit loss triggers; therefore, no DCF analysis was performed and no credit loss was recognized on any of the securities available for sale. Accrued interest receivable is excluded from the estimate of credit losses for securities available for sale. At June 30, 2021, accrued interest receivable totaled $4.2 million for securities available for sale compared to $4.0 million at December 31, 2020 and was reported in other assets on the accompanying consolidated balance sheets. Securities Held to Maturity At June 30, 2021, the potential credit loss exposure was $13.0 million compared to $26.6 million at December 31, 2020 and consisted of municipal securities. After applying appropriate probability of default (PD) and loss given default (LGD) assumptions, the total amount of current expected credit losses was deemed immaterial. Therefore, no reserve was recorded at June 30, 2021 and December 31, 2020. Accrued interest receivable is excluded from the estimate of credit losses for securities held to maturity. At June 30, 2021 and accrued interest receivable totaled $888 thousand for securities held to maturity compared to $1.2 million at December 31, 2020 and was reported in other assets on the accompanying consolidated balance sheets. At both June 30, 2021 and December 31, 2020, Trustmark had no securities held to maturity that were past due 30 days or more as to principal or interest payments. Trustmark had no securities held to maturity classified as nonaccrual at June 30, 2021 and December 31, 2020. Trustmark monitors the credit quality of securities held to maturity on a monthly basis through credit ratings. The following table presents the amortized cost of Trustmark’s securities held to maturity by credit rating, as determined by Moody’s, at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 December 31, 2020 Aaa $ 420,018 $ 511,488 Aa1 to Aa3 8,944 22,528 Not Rated (1) 4,050 4,056 Total $ 433,012 $ 538,072 (1) Not rated securities primarily consist of Mississippi municipal general obligations. The tables below include securities with gross unrealized losses for which an allowance for credit losses has not been recorded and segregated by length of impairment at June 30, 2021 and December 31, 2020 ($ in thousands): Less than 12 Months 12 Months or More Total June 30, 2021 Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses U.S. Government agency obligations $ — $ — $ 10,003 $ (387 ) $ 10,003 $ (387 ) Obligations of states and political subdivisions 3,206 (3 ) 667 (2 ) 3,873 (5 ) Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 1,143 (11 ) — — 1,143 (11 ) Issued by FNMA and FHLMC 924,404 (7,166 ) — — 924,404 (7,166 ) Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 19,828 (81 ) — — 19,828 (81 ) Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 89,050 (521 ) 649 (9 ) 89,699 (530 ) Total $ 1,037,631 $ (7,782 ) $ 11,319 $ (398 ) $ 1,048,950 $ (8,180 ) December 31, 2020 U.S. Government agency obligations $ — $ — $ 11,167 $ (481 ) $ 11,167 $ (481 ) Obligations of states and political subdivisions — — 667 (3 ) 667 (3 ) Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 1,636 (3 ) — — 1,636 (3 ) Issued by FNMA and FHLMC 324,905 (1,308 ) — — 324,905 (1,308 ) Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 29,398 (101 ) — — 29,398 (101 ) Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA — — 659 (9 ) 659 (9 ) Total $ 355,939 $ (1,412 ) $ 12,493 $ (493 ) $ 368,432 $ (1,905 ) The unrealized losses shown above are due to increases in market rates over the yields available at the time of purchase of the underlying securities and not credit quality. Trustmark does not intend to sell these securities and it is more likely than not that Trustmark will not be required to sell the investments before recovery of their amortized cost bases, which may be at maturity. Security Gains and Losses During the six months ended June 30, 2021 and 2020, there were no gross realized gains or losses as a result of calls and dispositions of securities. Realized gains and losses are determined using the specific identification method and are included in noninterest income as security gains (losses), net. Securities Pledged Securities with a carrying value of $2.163 billion and $1.964 billion at June 30, 2021 and December 31, 2020, respectively, were pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law. At both June 30, 2021 and December 31, 2020, none of these securities were pledged under the Federal Reserve Discount Window program to provide additional contingency funding capacity. Contractual Maturities The amortized cost and estimated fair value of securities available for sale and held to maturity at June 30, 2021, by contractual maturity, are shown below ($ in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities Available for Sale Securities Held to Maturity Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 1,354 $ 1,376 $ 7,660 $ 7,687 Due after one year through five years 16,721 16,784 5,334 5,419 Due after five years through ten years 16,191 16,189 — — Due after ten years 17,178 17,506 — — 51,444 51,855 12,994 13,106 Mortgage-backed securities 2,480,441 2,496,884 420,018 439,182 Total $ 2,531,885 $ 2,548,739 $ 433,012 $ 452,288

Loans Held for Investment (LHFI

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI	6 Months Ended
	Jun. 30, 2021
Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]
Loans Held for Investment (LHFI) and Allowance for Credit Losses, LHFI	Note 3 – LHFI and Allowance for Credit Losses, LHFI At June 30, 2021 and December 31, 2020, LHFI consisted of the following ($ in thousands): June 30, 2021 December 31, 2020 Loans secured by real estate: Construction, land development and other land $ 532,637 $ 514,056 Other secured by 1-4 family residential properties 507,733 524,732 Secured by nonfarm, nonresidential properties 2,819,662 2,709,026 Other real estate secured 1,078,622 1,065,964 Other loans secured by real estate: Other construction 827,665 794,983 Secured by 1-4 family residential properties 1,302,663 1,216,400 Commercial and industrial loans 1,326,605 1,309,078 Consumer loans 156,075 164,386 State and other political subdivision loans 1,136,764 1,000,776 Other commercial loans 464,443 525,123 LHFI 10,152,869 9,824,524 Less ACL 104,032 117,306 Net LHFI $ 10,048,837 $ 9,707,218 Accrued interest receivable is not included in the amortized cost basis of Trustmark’s LHFI. At June 30, 2021 and December 31, 2020, accrued interest receivable for LHFI totaled $29.7 million and $33.0 million, respectively, with no related ACL and was reported in other assets on the accompanying consolidated balance sheet. Loan Concentrations Trustmark does not have any loan concentrations other than those reflected in the preceding table, which exceed 10% of total LHFI. At June 30, 2021, Trustmark’s geographic loan distribution was concentrated primarily in its five key market regions: Alabama, Florida, Mississippi, Tennessee and Texas. Accordingly, the ultimate collectability of a substantial portion of these loans is susceptible to changes in market conditions in these areas. Nonaccrual and Past Due LHFI No material interest income was recognized in the income statement on nonaccrual LHFI for each of the periods ended June 30, 2021 and 2020. The following tables provide the amortized cost basis of loans on nonaccrual status and loans past due 90 days or more still accruing interest at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 Nonaccrual With No ACL Total Nonaccrual Loans Past Due 90 Days or More Still Accruing Loans secured by real estate: Construction, land development and other land $ 5,903 $ 6,165 $ — Other secured by 1-4 family residential properties 1,376 3,731 52 Secured by nonfarm, nonresidential properties 11,532 13,563 — Other real estate secured 57 175 — Other loans secured by real estate: Other construction — — — Secured by 1-4 family residential properties — 12,222 255 Commercial and industrial loans 3,078 6,042 — Consumer loans — 53 116 State and other political subdivision loans — 3,854 — Other commercial loans 77 5,643 — Total $ 22,023 $ 51,448 $ 423 December 31, 2020 Nonaccrual With No ACL Total Nonaccrual Loans Past Due 90 Days or More Still Accruing Loans secured by real estate: Construction, land development and other land $ 5,756 $ 5,985 $ — Other secured by 1-4 family residential properties 1,895 4,487 79 Secured by nonfarm, nonresidential properties 12,037 15,197 — Other real estate secured 60 185 — Other loans secured by real estate: Other construction — — — Secured by 1-4 family residential properties — 11,807 1,257 Commercial and industrial loans 12,665 15,618 — Consumer loans — 86 240 State and other political subdivision loans — 3,970 — Other commercial loans — 5,793 — Total $ 32,413 $ 63,128 $ 1,576 The following tables provide an aging analysis of the amortized cost basis of past due LHFI at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 Past Due 30-59 Days 60-89 Days 90 Days or More Total Past Due Current Loans Total LHFI Loans secured by real estate: Construction, land development and other land $ 352 $ 5,583 $ 196 $ 6,131 $ 526,506 $ 532,637 Other secured by 1-4 family residential properties 1,160 538 803 2,501 505,232 507,733 Secured by nonfarm, nonresidential properties 422 23 693 1,138 2,818,524 2,819,662 Other real estate secured 63 — 107 170 1,078,452 1,078,622 Other loans secured by real estate: Other construction — — — — 827,665 827,665 Secured by 1-4 family residential properties 2,230 1,061 5,816 9,107 1,293,556 1,302,663 Commercial and industrial loans 291 65 3,797 4,153 1,322,452 1,326,605 Consumer loans 767 87 116 970 155,105 156,075 State and other political subdivision loans — — 177 177 1,136,587 1,136,764 Other commercial loans 400 73 5,086 5,559 458,884 464,443 Total $ 5,685 $ 7,430 $ 16,791 $ 29,906 $ 10,122,963 $ 10,152,869 December 31, 2020 Past Due 30-59 Days 60-89 Days 90 Days or Total Past Due Current Loans Total LHFI Loans secured by real estate: Construction, land development and other land $ 339 $ 34 $ 161 $ 534 $ 513,522 $ 514,056 Other secured by 1-4 family residential properties 1,505 523 896 2,924 521,808 524,732 Secured by nonfarm, nonresidential properties 920 — 972 1,892 2,707,134 2,709,026 Other real estate secured 103 101 107 311 1,065,653 1,065,964 Other loans secured by real estate: Other construction — — — — 794,983 794,983 Secured by 1-4 family residential properties 3,291 1,289 5,110 9,690 1,206,710 1,216,400 Commercial and industrial loans 271 196 1,543 2,010 1,307,068 1,309,078 Consumer loans 926 190 240 1,356 163,030 164,386 State and other political subdivision loans 117 — 177 294 1,000,482 1,000,776 Other commercial loans 2,143 2,971 346 5,460 519,663 525,123 Total $ 9,615 $ 5,304 $ 9,552 $ 24,471 $ 9,800,053 $ 9,824,524 Troubled Debt Restructurings (TDR) A TDR occurs when a borrower is experiencing financial difficulties, and for related economic or legal reasons, a concession is granted to the borrower that Trustmark would not otherwise consider. Whatever the form of concession that might be granted by Trustmark, Management’s objective is to enhance collectability by obtaining more cash or other value from the borrower or by increasing the probability of receipt by granting the concession than by not granting it. Other concessions may arise from court proceedings or may be imposed by law. In addition, TDRs also include those credits that are extended or renewed to a borrower who is not able to obtain funds from sources other than Trustmark at a market interest rate for new debt with similar risk. At June 30, 2021 and 2020, LHFI classified as TDRs totaled $25.1 million and $26.9 million, respectively. At June 30, 2021, TDRs were primarily comprised of payment concessions, credits with interest-only payments for an extended period of time and credits renewed at a rate that was not commensurate with that of new debt with similar risk which totaled $16.4 million. At June 30, 2020, TDRs were primarily comprised of credits with interest-only payments for an extended period of time and credits renewed at a rate that was not commensurate with that of new debt with similar risk which totaled $14.6 million. The remaining TDRs at June 30, 2021 and 2020 resulted from bankruptcies or from payment or maturity extensions. Trustmark had $2.0 million of unused commitments on TDRs at June 30, 2021 compared to $5.6 million at June 30, 2020. At June 30, 2021, TDRs had a related ACL of $3.9 million, compared to $2.0 million at June 30, 2020. Trustmark had $3.7 million in charge-offs on TDRs for the six months ended June 30, 2021, compared to $2.2 million for the six months ended June 30, 2020. The following table illustrates the impact of modifications classified as TDRs for the periods presented ($ in thousands): Three Months Ended June 30, 2021 2020 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Loans secured by real estate: Construction, land development and other land 5 $ 5,582 $ 5,582 — $ — $ — Other secured by 1-4 family residential properties 3 37 37 3 206 210 Secured by nonfarm, nonresidential properties 1 377 377 1 139 139 Other loans secured by real estate: Secured by 1-4 family residential properties 1 123 123 — — — Commercial and industrial loans 1 1,000 1,000 — — — Consumer loans — — — 2 6 6 State and other political subdivision loans — — — 2 3,902 3,872 Other commercial loans 2 4,929 4,929 — — — Total 13 $ 12,048 $ 12,048 8 $ 4,253 $ 4,227 Six Months Ended June 30, 2021 2020 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Loans secured by real estate: Construction, land development and other land 5 5,582 5,582 — $ — $ — Other secured by 1-4 family residential properties 3 37 37 8 707 711 Secured by nonfarm, nonresidential properties 1 377 377 1 139 139 Other loans secured by real estate: Secured by 1-4 family residential properties 3 249 249 — — — Commercial and industrial loans 2 1,014 1,014 2 1,582 1,582 Consumer loans — — — 6 26 26 State and other political subdivision loans — — — 2 3,902 3,872 Other commercial loans 2 4,929 4,929 — — — Total 16 $ 12,188 $ 12,188 19 $ 6,356 $ 6,330 The table below includes the balances at default for TDRs modified within the last 12 months for which there was a payment default during the periods presented ($ in thousands): Six Months Ended June 30, 2021 2020 Number of Contracts Recorded Investment Number of Contracts Recorded Investment Loans secured by real estate: Other secured by 1-4 family residential properties — $ — 3 $ 420 Secured by nonfarm, nonresidential properties — — 1 139 Other loans secured by real estate: Secured by 1-4 family residential properties 1 78 — — Commercial and industrial loans — — 1 82 Other commercial loans 2 4,929 — — Total 3 $ 5,007 5 $ 641 Trustmark’s TDRs have resulted primarily from allowing the borrower to pay interest-only for an extended period of time and credits renewed at a rate that was not commensurate with that of new debt with similar risk rather than from forgiveness. Accordingly, as shown above, these TDRs have a similar recorded investment for both the pre-modification and post-modification disclosure. Trustmark has utilized loans 90 days or more past due to define payment default in determining TDRs that have subsequently defaulted. The following tables detail LHFI classified as TDRs by loan class at June 30, 2021 and 2020 ($ in thousands): June 30, 2021 Accruing Nonaccrual Total Loans secured by real estate: Construction, land development and other land $ — $ 5,593 $ 5,593 Other secured by 1-4 family residential properties — 1,160 1,160 Secured by nonfarm, nonresidential properties — 3,090 3,090 Other loans secured by real estate: Secured by 1-4 family residential properties 52 2,414 2,466 Commercial and industrial loans 2,500 1,608 4,108 Consumer loans — 12 12 State and other political subdivision loans — 3,677 3,677 Other commercial loans — 5,009 5,009 Total TDRs $ 2,552 $ 22,563 $ 25,115 June 30, 2020 Accruing Nonaccrual Total Loans secured by real estate: Construction, land development and other land $ — $ 14 $ 14 Other secured by 1-4 family residential properties 71 3,761 3,832 Secured by nonfarm, nonresidential properties — 3,010 3,010 Commercial and industrial loans 1,500 14,487 15,987 Consumer loans 18 21 39 State and other political subdivision loans — 3,872 3,872 Other commercial loans — 125 125 Total TDRs $ 1,589 $ 25,290 $ 26,879 The CARES Act, as amended by subsequent legislation, specified that COVID-19 related modifications executed between March 1, 2020 and the earlier of either (i) 60 days after the date of termination of the national emergency declared by the President or (ii) January 1, 2022, on loans that were current as of December 31, 2019 were not TDRs. Additionally, under guidance from the federal banking agencies, other short-term modifications made on a good faith basis in response to COVID-19 to borrowers that were current prior to any relief are not TDRs under the Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Subtopic 310-40, “Troubled Debt Restructuring by Creditors.” These modifications include short-term (e.g., up to six months) modifications such as payment deferrals, fee waivers, extensions of repayment terms, or delays in payment that are insignificant. Borrowers considered current are those that are less than 30 days past due on their contractual payments at the time a modification program is implemented. Commercial concessions were primarily either interest only for 90 days or full payment deferrals for 90 days . Consumer concessions were 90-day full payment deferrals. At June 30, 2021 , the balance of loans remaining under some type of COVID-19 related concession totaled $ 19.0 million compared to $ 34.2 million at December 31, 202 0 . Collateral-Dependent Loans The following table presents the amortized cost basis of collateral-dependent loans by class of loans and collateral type as of June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 Real Estate Equipment and Machinery Inventory and Receivables Vehicles Miscellaneous Total Loans secured by real estate: Construction, land development and other land $ 5,903 $ — $ — $ — $ — $ 5,903 Other secured by 1-4 family residential properties — — — — — — Secured by nonfarm, nonresidential properties 11,763 — — — — 11,763 Other real estate secured 57 — — — — 57 Other loans secured by real estate: Other construction — — — — — — Secured by 1-4 family residential properties 1,376 — — — — 1,376 Commercial and industrial loans 43 72 4,285 74 — 4,474 Consumer loans — — — — — — State and other political subdivision loans 3,854 — — — — 3,854 Other commercial loans 365 — 2,031 4 3,051 5,451 Total $ 23,361 $ 72 $ 6,316 $ 78 $ 3,051 $ 32,878 December 31, 2020 Real Estate Equipment and Machinery Inventory and Receivables Vehicles Miscellaneous Total Loans secured by real estate: Construction, land development and other land $ 5,756 $ — $ — $ — $ — $ 5,756 Other secured by 1-4 family residential properties 454 — — — — 454 Secured by nonfarm, nonresidential properties 12,037 — — — — 12,037 Other real estate secured 60 — — — — 60 Other loans secured by real estate: Other construction — — — — — — Secured by 1-4 family residential properties 1,441 — — — — 1,441 Commercial and industrial loans 86 425 4,899 135 8,531 14,076 Consumer loans — — — — — — State and other political subdivision loans 3,970 — — — — 3,970 Other commercial loans 606 — 1,958 — 3,051 5,615 Total $ 24,410 $ 425 $ 6,857 $ 135 $ 11,582 $ 43,409 A loan is collateral dependent when the borrower is experiencing financial difficulty and repayment of the loan is expected to be provided substantially through the sale of the collateral. The following provides a qualitative description by class of loan of the collateral that secures Trustmark’s collateral-dependent LHFI: • Loans secured by real estate – Loans within these loan classes are secured by liens on real estate properties. There have been no significant changes to the collateral that secures these financial assets during the period. • Other loans secured by real estate – Loans within these loan classes are secured by liens on real estate properties. There have been no significant changes to the collateral that secures these financial assets during the period. • Commercial and industrial loans – Loans within this loan class are primarily secured by inventory, accounts receivables, equipment and other non-real estate collateral. During the second quarter of 2021, a relationship previously reserved for was charged down to fair value. There have been no other significant changes to the collateral that secures these financial assets during the period. • State and other political subdivision loans – Loans within this loan class are secured by liens on real estate properties. There have been no significant changes to the collateral that secures these financial assets during the period. • Other commercial loans – Loans within this loan class are secured by liens on real estate properties or priority status of a Uniform Commercial Code agreement for non-real estate collateral. There have been no significant changes to the collateral that secures these financial assets during the period. Credit Quality Indicators Trustmark’s LHFI portfolio credit quality indicators focus on six key quality ratios that are compared against bank tolerances. The loan indicators are total classified outstanding, total criticized outstanding, nonperforming loans, nonperforming assets, delinquencies and net loan losses. Due to the homogenous nature of consumer loans, Trustmark does not assign a formal internal risk rating to each credit and therefore the criticized and classified measures are primarily composed of commercial loans. In addition to monitoring portfolio credit quality indicators, Trustmark also measures how effectively the lending process is being managed and risks are being identified. As part of an ongoing monitoring process, Trustmark grades the commercial portfolio segment as it relates to credit file completion and financial statement exceptions, underwriting, collateral documentation and compliance with law as shown below: • Credit File Completeness and Financial Statement Exceptions – evaluates the quality and condition of credit files in terms of content and completeness and focuses on efforts to obtain and document sufficient information to determine the quality and status of credits. Also included is an evaluation of the systems/procedures used to ensure compliance with policy. • Underwriting – evaluates whether credits are adequately analyzed, appropriately structured and properly approved within loan policy requirements. A properly approved credit is approved by adequate authority in a timely manner with all conditions of approval fulfilled. Total policy exceptions measure the level of underwriting and other policy exceptions within a portfolio segment. • Collateral Documentation – focuses on the adequacy of documentation to perfect Trustmark’s collateral position and substantiate collateral value. Collateral exceptions measure the level of documentation exceptions within a portfolio segment. Collateral exceptions occur when certain collateral documentation is either not present or not current. • Compliance with Law – focuses on underwriting, documentation, approval and reporting in compliance with banking laws and regulations. Primary emphasis is directed to the Financial Institutions Reform, Recovery and Enforcement Act of 1989 (FIRREA), Regulation O requirements and regulations governing appraisals. Commercial Credits Trustmark has established a loan grading system that consists of ten individual credit risk grades (risk ratings) that encompass a range from loans where the expectation of loss is negligible to loans where loss has been established. The model is based on the risk of default for an individual credit and establishes certain criteria to delineate the level of risk across the ten unique credit risk grades. Credit risk grade definitions are as follows: • Risk Rate (RR) 1 through RR 6 – Grades one through six represent groups of loans that are not subject to criticism as defined in regulatory guidance. Loans in these groups exhibit characteristics that represent low to moderate risk measured by using a variety of credit risk criteria such as cash flow coverage, debt service coverage, balance sheet leverage, liquidity, management experience, industry position, prevailing economic conditions, support from secondary sources of repayment and other credit factors that may be relevant to a specific loan. In general, these loans are supported by properly margined collateral and guarantees of principal parties. • Other Assets Especially Mentioned (Special Mention) (RR 7) – a loan that has a potential weakness that if not corrected will lead to a more severe rating. This rating is for credits that are currently protected but potentially weak because of an adverse feature or condition that if not corrected will lead to a further downgrade. • Substandard (RR 8) – a loan that has at least one identified weakness that is well defined. This rating is for credits where the primary sources of repayment are not viable at the time of evaluation or where either the capital or collateral is not adequate to support the loan and the secondary means of repayment do not provide a sufficient level of support to offset the identified weakness. Loss potential exists in the aggregate amount of substandard loans but does not necessarily exist in individual loans. • Doubtful (RR 9) – a loan with an identified weakness that does not have a valid secondary source of repayment. Generally, these credits have an impaired primary source of repayment and secondary sources are not sufficient to prevent a loss in the credit. The exact amount of the loss has not been determined at this time. • Loss (RR 10) – a loan or a portion of a loan that is deemed to be uncollectible. By definition, credit risk grades special mention (RR 7), substandard (RR 8), doubtful (RR 9) and loss (RR 10) are criticized loans while substandard (RR 8), doubtful (RR 9) and loss (RR 10) are classified loans. These definitions are standardized by all bank regulatory agencies and are generally equally applied to each individual lending institution. The remaining credit risk grades are considered pass credits and are solely defined by Trustmark. To enhance this process, Trustmark has determined that loans will be individually assessed, and a formal analysis will be performed and based upon the analysis the loan will be written down to net realizable value. Trustmark will individually assess and remove loans from the pool in the following circumstances: • Commercial nonaccrual loans with total exposure of $500 thousand (excluding those portions of the debt that are government guaranteed or are secured by Trustmark deposits or marketable securities) or more. • Any loan that is believed to not share similar risk characteristics with the rest of the pool will be individually assessed. Otherwise, the loan will be left within the pool based on the results of the assessment. • Commercial accruing loans deemed to be a TDR with total exposure of $500 thousand (excluding those portions of the debt that are government guaranteed or are secured by Trustmark deposits or marketable securities) or more. If the loan is believed to not share similar risk characteristics with the rest of the loan pool, the loan will be individually assessed. Otherwise, the loan will be left within the pool and monitored on an ongoing basis. Each loan officer assesses the appropriateness of the internal risk rating assigned to their credits on an ongoing basis. Trustmark’s Asset Review area conducts independent credit quality reviews of the majority of Trustmark’s commercial loan portfolio both on the underlying credit quality of each individual loan class as well as the adherence to Trustmark’s loan policy and the loan administration process. In addition to the ongoing internal risk rate monitoring described above, Trustmark’s Credit Quality Review Committee meets monthly and performs a review of all loans of $100 thousand or more that are either delinquent 30 days or more or on nonaccrual. This review includes recommendations regarding risk ratings, accrual status, charge-offs and appropriate servicing officer as well as evaluation of problem credits for determination of TDRs. Quarterly, the Credit Quality Review Committee reviews and modifies continuous action plans for all credits risk rated seven or worse for relationships of $100 thousand or more. In addition, periodic reviews of significant development, commercial construction, multi-family and nonowner-occupied projects are performed. These reviews assess each particular project with respect to location, project valuations, progress of completion, leasing status, current financial information, rents, operating expenses, cash flow, adherence to budget and projections and other information as applicable. Summary results are reviewed by Senior and Regional Credit Officers in addition to the Chief Credit Officer with a determination made as to the appropriateness of existing risk ratings and accrual status. Consumer Credits Consumer LHFI that do not meet a minimum custom credit score are reviewed quarterly by Management. The Retail Credit Review Committee reviews the volume and percentage of approvals that did not meet the minimum passing custom score to ensure that Trustmark continues to originate quality loans. Trustmark monitors the levels and severity of past due consumer LHFI on a daily basis through its collection activities. A detailed assessment of consumer LHFI delinquencies is performed monthly at both a product and market level by delivery channel, which incorporates the perceived level of risk at time of underwriting. The tables below present the amortized cost basis of loans by credit quality indicator and class of loans based on analyses performed at June 30, 2021 and December 31, 2020 ($ in thousands): Term Loans by Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Total As of June 30, 2021 Commercial LHFI Loans secured by real estate: Construction, land development and other land: Pass - RR 1 through RR 6 $ 188,112 $ 163,334 $ 36,863 $ 15,430 $ 1,880 $ 5,231 $ 33,860 $ 444,710 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 2,538 15 3,461 44 12 112 — 6,182 Doubtful - RR 9 — — — — — 42 — 42 Total 190,650 163,349 40,324 15,474 1,892 5,385 33,860 450,934 Other secured by 1-4 family residential properties: Pass - RR 1 through RR 6 $ 20,192 $ 28,659 $ 15,975 $ 12,834 $ 7,585 $ 8,108 $ 7,366 $ 100,719 Special Mention - RR 7 143 181 — 47 — — — 371 Substandard - RR 8 649 432 7 181 157 676 — 2,102 Doubtful - RR 9 — 25 — — — — — 25 Total 20,984 29,297 15,982 13,062 7,742 8,784 7,366 103,217 Secured by nonfarm, nonresidential properties: Pass - RR 1 through RR 6 $ 281,444 $ 635,065 $ 590,473 $ 445,938 $ 241,109 $ 404,951 $ 79,715 $ 2,678,695 Special Mention - RR 7 10,324 9,729 1,445 1,683 1,640 4,874 — 29,695 Substandard - RR 8 14,553 2,787 24,746 4,211 3,747 59,278 1,508 110,830 Doubtful - RR 9 48 — 150 — — 206 — 404 Total 306,369 647,581 616,814 451,832 246,496 469,309 81,223 2,819,624 Other real estate secured: Pass - RR 1 through RR 6 $ 139,687 $ 90,717 $ 451,580 $ 256,369 $ 33,260 $ 79,188 $ 12,611 $ 1,063,412 Special Mention - RR 7 — — — — — 808 — 808 Substandard - RR 8 3,836 9,999 — 12 — 179 — 14,026 Doubtful - RR 9 — — — — — — — — Total 143,523 100,716 451,580 256,381 33,260 80,175 12,611 1,078,246 Term Loans by Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Total As of June 30, 2021 Commercial LHFI Other loans secured by real estate: Other construction: Pass - RR 1 through RR 6 $ 178,219 $ 389,105 $ 231,297 $ 19,166 $ — $ — $ 8,505 $ 826,292 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 1,373 — — — — — — 1,373 Doubtful - RR 9 — — — — — — — — Total 179,592 389,105 231,297 19,166 — — 8,505 827,665 Commercial and industrial loans: Pass - RR 1 through RR 6 $ 277,330 $ 304,664 $ 140,848 $ 43,836 $ 57,941 $ 77,328 $ 367,148 $ 1,269,095 Special Mention - RR 7 1,032 385 212 715 97 — 678 3,119 Substandard - RR 8 6,640 6,032 1,799 1,472 3,589 3,251 31,294 54,077 Doubtful - RR 9 1 134 43 111 — 25 — 314 Total 285,003 311,215 142,902 46,134 61,627 80,604 399,120 1,326,605 State and other political subdivision loans: Pass - RR 1 through RR 6 $ 232,696 $ 193,403 $ 92,035 $ 36,643 $ 100,328 $ 466,386 $ 8,069 $ 1,129,560 Special Mention - RR 7 — — — — — 3,350 — 3,350 Substandard - RR 8 — — — — — 3,854 — 3,854 Doubtful - RR 9 — — — — — — — — Total 232,696 193,403 92,035 36,643 100,328 473,590 8,069 1,136,764 Other commercial loans: Pass - RR 1 through RR 6 $ 53,866 $ 53,529 $ 69,767 $ 15,147 $ 8,607 $ 62,018 $ 176,553 $ 439,487 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 — 7,235 2,113 415 — 316 14,804 24,883 Doubtful - RR 9 — 50 — — — 23 — 73 Total 53,866 60,814 71,880 15,562 8,607 62,357 191,357 464,443 Total commercial LHFI $ 1,412,683 $ 1,895,480 $ 1,662,814 $ 854,254 $ 459,952 $ 1,180,204 $ 742,111 $ 8,207,498 Term Loans by Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Total As of June 30, 2021 Consumer LHFI Loans secured by real estate: Construction, land development and other land: Current $ 17,103 $ 43,274 $ 11,951 $ 4,272 $ 1,092 $ 3,183 $ 451 $ 81,326 Past due 30-89 days — — 162 19 — 65 — 246 Past due 90 days or more — — — — — — — — Nonaccrual — — — — — 131 — 131 Total 17,103 43,274 12,113 4,291 1,092 3,379 451 81,703 Other secured by 1-4 family residential properties: Current $ 16,240 $ 13,834 $ 7,724 $ 7,426 $ 3,730 $ 10,239 $ 341,240 $ 400,433 Past due 30-89 days — 42 112 — — 88 548 790 Past due 90 days or more — — 32 — — — 21 53 Nonaccrual 14 61 15 11 412 371 2,356 3,240 Total 16,254 13,937 7,883 7,437 4,142 10,698 344,165 404,516 Secured by nonfarm, nonresidential properties: Current $ 35 $ — $ — $ — $ 3 $ — $ — $ 38 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total 35 — — — 3 — — 38 Other real estate secured: Current $ — $ 102 $ — $ 9 $ 34 $ 231 $ — $ 376 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — 102 — 9 34 231 — 376 Term Loans by Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Total As of June 30, 2021 Consumer LHFI Other loans secured by real estate: Secured by 1-4 family residential properties Current $ 308,154 $ 258,410 $ 167,332 $ 133,808 $ 73,300 $ 346,774 $ — $ 1,287,778 Past due 30-89 days — 701 186 174 121 1,229 — 2,411 Past due 90 days or more — 253 — — — 2 — 255 Nonaccrual — 1,203 896 2,110 861 7,149 — 12,219 Total 308,154 260,567 168,414 136,092 74,282 355,154 — 1,302,663 Consumer loans: Current $ 37,466 $ 40,869 $ 15,320 $ 8,082 $ 2,317 $ 907 $ 50,097 $ 155,058 Past due 30-89 days 327 163 52 25 1 1 279 848 Past due 90 days or more 20 — 12 — — — 84 116 Nonaccrual — 5 3 20 10 1 14 53 Total 37,813 41,037 15,387 8,127 2,328 909 50,474 156,075 Total consumer LHFI $ 379,359 $ 358,917 $ 203,797 $ 155,956 $ 81,881 $ 370,371 $ 395,090 $ 1,945,371 Total LHFI $ 1,792,042 $ 2,254,397 $ 1,866,611 $ 1,010,210 $ 541,833 $ 1,550,575 $ 1,137,201 $ 10,152,869 Term Loans by Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Total As of December 31, 2020 Commercial LHFI Loans secured by real estate: Construction, land development and other land: Pass - RR 1 through RR 6 $ 287,218 $ 62,078 $ 26,401 $ 4,487 $ 3,274 $ 3,564 $ 28,548 $ 415,570 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 5,419 4,363 1,226 12 494 22 101 11,637 Doubtful - RR 9 — — — — — 42 — 42 Total 292,637 66,441 27,627 4,499 3,768 3,628 28,649 427,249 Other secured by 1-4 family residential properties: Pass - RR 1 through RR 6 $ 35,139 $ 19,596 $ 15,399 $ 9,605 $ 10,273 $ 4,786 $ 8,486 $ 103,284 Special Mention - RR 7 255 — 50 — — — — 305 Substandard - RR 8 1,155 8 914 341 302 337 3,950 7,007 Doubtful - RR 9 29 — — — — — — 29 Total 36,578 19,604 16,363 9,946 10,575 5,123 12,436 110,625 Secured by nonfarm, nonresidential properties: Pass - RR 1 through RR 6 $ 697,439 $ 496,476 $ 442,264 $ 293,072 $ 254,747 $ 251,219 $ 96,098 $ 2,531,315 Special Mention - RR 7 13,452 6,139 2,956 4,466 4,957 20,545 — 52,515 Substandard - RR 8 19,119 20,572 4,516 12,956 38,956 25,438 2,779 124,336 Doubtful - RR 9 52 163 — — 217 306 — 738 Total 730,062 523,350 449,736 310,494 298,877 297,508 98,877 2,708,904 Other real estate secured: Pass - RR 1 through RR 6 $ 146,803 $ 376,765 $ 347,472 $ 48,626 $ 89,824 $ 23,680 $ 12,116 $ 1,045,286 Special Mention - RR 7 — — — — — 841 — 841 Substandard - RR 8 18,649 14 18 — 556 122 — 19,359 Doubtful - RR 9 — — — — — — — — Total 165,452 376,779 347,490 48,626 90,380 24,643 12,116 1,065,486 Term Loans by Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Total As of December 31, 2020 Commercial LHFI Other loans secured by real estate: Other construction Pass - RR 1 through RR 6 $ 262,544 $ 425,936 $ 81,476 $ 14,074 $ 2,464 $ — $ 7,735 $ 794,229 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 754 — — — — — — 754 Doubtful - RR 9 — — — — — — — — Total 263,298 425,936 81,476 14,074 2,464 — 7,735 794,983 Commercial and industrial loans: Pass - RR 1 through RR 6 $ 444,304 $ 165,163 $ 77,611 $ 77,985 $ 59,131 $ 43,214 $ 372,486 $ 1,239,894 Special Mention - RR 7 677 45 — — — — 240 962 Substandard - RR 8 12,090 1,814 9,737 3,735 2,160 5,024 33,380 67,940 Doubtful - RR 9 151 95 — — 32 4 — 282 Total 457,222 167,117 87,348 81,720 61,323 48,242 406,106 1,309,078 State and other polit

Mortgage Banking

Mortgage Banking	6 Months Ended
	Jun. 30, 2021
Mortgage Banking [Abstract]
Mortgage Banking	Note 4 – Mortgage Banking Mortgage Servicing Rights The activity in the mortgage servicing rights (MSR) is detailed in the table below for the periods presented ($ in thousands): Six Months Ended June 30, 2021 2020 Balance at beginning of period $ 66,464 $ 79,394 Origination of servicing assets 15,201 12,396 Change in fair value: Due to market changes 9,231 (27,158 ) Due to run-off (10,132 ) (6,821 ) Balance at end of period $ 80,764 $ 57,811 Trustmark determines the fair value of the MSR using a valuation model administered by a third party that calculates the present value of estimated future net servicing income. Trustmark considers the conditional prepayment rate (CPR), which is an estimated loan prepayment rate that uses historical prepayment rates for previous loans similar to the loans being evaluated, and the discount rate in determining the fair value of the MSR. An increase in either the CPR or discount rate assumption will result in a decrease in the fair value of the MSR, while a decrease in either assumption will result in an increase in the fair value of the MSR. At June 30, 2021, the fair value of the MSR included an assumed average prepayment speed of 12 CPR and an average discount rate of 9.54% compared to an assumed average prepayment speed of 17 CPR and an average discount rate of 9.58% at June 30, 2020. Mortgage Loans Serviced/Sold During the first six months of 2021 and 2020, Trustmark sold $1.289 billion and $1.103 billion, respectively, of residential mortgage loans. Gains on these sales were recorded as noninterest income in mortgage banking, net and totaled $34.2 million for the first six months of 2021 compared to $48.4 million for the first six months of 2020. The table below details the mortgage loans sold and serviced for others at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 December 31, 2020 Federal National Mortgage Association $ 4,718,042 $ 4,629,670 Government National Mortgage Association 3,077,238 2,960,760 Federal Home Loan Mortgage Corporation 43,040 50,459 Other 14,773 16,201 Total mortgage loans sold and serviced for others $ 7,853,093 $ 7,657,090 Trustmark is subject to losses in its loan servicing portfolio due to loan foreclosures. Trustmark has obligations to either repurchase the outstanding principal balance of a loan or make the purchaser whole for the economic benefits of a loan if it is determined that the loan sold was in violation of representations or warranties made by Trustmark at the time of the sale, herein referred to as mortgage loan servicing putback expenses. Such representations and warranties typically include those made regarding loans that had missing or insufficient file documentation, loans that do not meet investor guidelines, loans in which the appraisal does not support the value and/or loans obtained through fraud by the borrowers or other third parties. Generally, putback requests may be made until the loan is paid in full. However, mortgage loans delivered to Federal National Mortgage Association (FNMA) and Federal Home Loan Mortgage Corporation (FHLMC) on or after January 1, 2013 are subject to the Lending and Selling Representations and Warranties Framework, which provides certain instances in which FNMA and FHLMC will not exercise their remedies, including a putback request, for breaches of certain selling representations and warranties, such as payment history and quality control review. When a putback request is received, Trustmark evaluates the request and takes appropriate actions based on the nature of the request. Trustmark is required by FNMA and FHLMC to provide a response to putback requests within 60 days of the date of receipt. The total mortgage loan servicing putback expenses are included in other expense. At both June 30, 2021 and 2020, Trustmark had a reserve for mortgage loan servicing putback expenses of $500 thousand. There is inherent uncertainty in reasonably estimating the requirement for reserves against potential future mortgage loan servicing putback expenses. Future putback expenses are dependent on many subjective factors, including the review procedures of the purchasers and the potential refinance activity on loans sold with servicing released and the subsequent consequences under the representations and warranties. Trustmark believes that it has appropriately reserved for potential mortgage loan servicing putback requests.

Other Real Estate

Other Real Estate	6 Months Ended
	Jun. 30, 2021
Other Real Estate And Foreclosed Assets [Abstract]
Other Real Estate	Note 5 – Other Real Estate At June 30, 2021, Trustmark’s geographic other real estate distribution was concentrated primarily in its five key market regions: Alabama, Florida, Mississippi, Tennessee and Texas. The ultimate recovery of a substantial portion of the carrying amount of other real estate is susceptible to changes in market conditions in these areas. For the periods presented, changes and gains (losses), net on other real estate were as follows ($ in thousands): Six Months Ended June 30, 2021 2020 Balance at beginning of period $ 11,651 $ 29,248 Additions 382 406 Disposals (1,149 ) (10,534 ) Write-downs (1,445 ) (844 ) Balance at end of period $ 9,439 $ 18,276 Gains (losses), net on the sale of other real estate included in other real estate expense $ 18 $ (255 ) At June 30, 2021 and December 31, 2020, other real estate by type of property consisted of the following ($ in thousands): June 30, 2021 December 31, 2020 Construction, land development and other land properties $ 3,249 $ 3,857 1-4 family residential properties 1,204 1,349 Nonfarm, nonresidential properties 4,986 6,445 Total other real estate $ 9,439 $ 11,651 At June 30, 2021 and December 31, 2020, other real estate by geographic location consisted of the following ($ in thousands): June 30, 2021 December 31, 2020 Alabama $ 2,830 $ 3,271 Mississippi (1) 6,550 8,330 Tennessee (2) 59 50 Total other real estate $ 9,439 $ 11,651 (1) Mississippi includes Central and Southern Mississippi Regions. (2) Tennessee includes Memphis, Tennessee and Northern Mississippi Regions. At June 30, 2021, the balance of other real estate included $1.2 million of foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property compared to $1.3 million at December 31, 2020. At June 30, 2021 and December 31, 2020, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process was $1.4 million and $424 thousand, respectively.

Leases

Leases	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Leases	Note 6 – Leases The following table details the components of net lease cost for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Finance leases: Amortization of right-of-use assets $ 387 $ 481 $ 771 $ 978 Interest on lease liabilities 56 65 113 132 Operating lease cost 1,342 1,289 2,647 2,579 Short-term lease cost 110 111 229 220 Variable lease cost 311 332 618 679 Sublease income (77 ) (63 ) (153 ) (162 ) Net lease cost $ 2,129 $ 2,215 $ 4,225 $ 4,426 The following table details the cash payments included in the measurement of lease liabilities during the periods presented ($ in thousands): Six Months Ended June 30, 2021 2020 Finance leases: Operating cash flows included in operating activities $ 113 $ 132 Financing cash flows included in payments under finance lease obligations 712 905 Operating leases: Operating cash flows (fixed payments) included in other operating activities, net 2,267 2,493 Operating cash flows (liability reduction) included in other operating activities, net 1,954 1,949 The following table details balance sheet information, as well as weighted-average lease terms and discount rates, related to leases at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 December 31, 2020 Finance lease right-of-use assets, net of accumulated depreciation $ 6,792 $ 7,471 Finance lease liabilities 7,185 7,805 Operating lease right-of-use assets 33,201 30,901 Operating lease liabilities 34,959 32,290 Weighted-average lease term: Finance leases 8.37 years 8.53 years Operating leases 9.06 years 8.65 years Weighted-average discount rate: Finance leases 3.15 % 3.10 % Operating leases 3.16 % 3.41 % At June 30, 2021, future minimum rental commitments under finance and operating leases were as follows ($ in thousands): Finance Leases Operating Leases 2021 (excluding the six months ended June 30, 2021) $ 828 $ 2,525 2022 1,597 4,864 2023 885 4,670 2024 572 4,713 2025 584 4,752 Thereafter 3,868 18,743 Total minimum lease payments 8,334 40,267 Less imputed interest (1,149 ) (5,308 ) Lease liabilities $ 7,185 $ 34,959

Deposits

Deposits	6 Months Ended
	Jun. 30, 2021
Deposits [Abstract]
Deposits	Note 7 – Deposits At June 30, 2021 and December 31, 2020, deposits consisted of the following ($ in thousands): June 30, 2021 December 31, 2020 Noninterest-bearing demand $ 4,446,991 $ 4,349,010 Interest-bearing demand 4,208,521 3,646,246 Savings 4,694,346 4,647,610 Time 1,282,226 1,405,898 Total $ 14,632,084 $ 14,048,764

Securities Sold Under Repurchas

Securities Sold Under Repurchase Agreements	6 Months Ended
	Jun. 30, 2021
Securities Sold Under Agreements To Repurchase [Abstract]
Securities Sold Under Repurchase Agreements	Note 8 – Securities Sold Under Repurchase Agreements Trustmark utilizes securities sold under repurchase agreements as a source of borrowing in connection with overnight repurchase agreements offered to commercial deposit customers by using its unencumbered investment securities as collateral. Trustmark accounts for its securities sold under repurchase agreements as secured borrowings in accordance with FASB ASC Subtopic 860-30, “Transfers and Servicing – Secured Borrowing and Collateral.” Securities sold under repurchase agreements are stated at the amount of cash received in connection with the transaction. Trustmark monitors collateral levels on a continual basis and may be required to provide additional collateral based on the fair value of the underlying securities. Securities sold under repurchase agreements were secured by securities with a carrying amount of $179.6 million and $156.1 million at June 30, 2021 and December 31, 2020, respectively. Trustmark’s repurchase agreements are transacted under master repurchase agreements that give Trustmark, in the event of default by the counterparty, the right of offset with the same counterparty. As of June 30, 2021, all repurchase agreements were short-term and consisted primarily of sweep repurchase arrangements, under which excess deposits are “swept” into overnight repurchase agreements with Trustmark. The following table presents the securities sold under repurchase agreements by collateral pledged at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 December 31, 2020 Mortgage-backed securities Residential mortgage pass-through securities Issued by FNMA and FHLMC $ 109,707 $ 115,357 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 921 12,696 Total securities sold under repurchase agreements $ 110,628 $ 128,053

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2021
Revenue From Contract With Customer [Abstract]
Revenue from Contracts with Customers	Note 9 – Revenue from Contracts with Customers Trustmark accounts for revenue from contracts with customers in accordance with FASB ASC Topic 606, “Revenue from Contracts with Customers,” which provides that revenue be recognized in a manner that depicts the transfer of goods or services to a customer in an amount that reflects the consideration Trustmark expects to be entitled to in exchange for those goods or services. Revenue from contracts with customers is recognized either over time in a manner that depicts Trustmark’s performance, or at a point in time when control of the goods or services are transferred to the customer. Trustmark’s noninterest income, excluding all of mortgage banking, net and securities gains (losses), net and portions of bank card and other fees and other income, are considered within the scope of FASB ASC Topic 606. Gains or losses on the sale of other real estate, which are included in Trustmark’s noninterest expense as other real estate expense, are also within the scope of FASB ASC Topic 606. Trustmark records a gain or loss from the sale of other real estate when control of the property transfers to the buyer. Trustmark records the gain or loss from the sale of other real estate in noninterest expense as other real estate expense, net. Other real estate sales for the three and six months ended June 30, 2021 resulted in a net loss of $41 thousand and a net gain of $18 thousand, respectively, compared to net losses of $185 thousand and $255 thousand for the three and six months ended June 30, 2020, respectively. The following table presents noninterest income disaggregated by reportable operating segment and revenue stream for the periods presented ($ in thousands): Three Months Ended June 30, 2021 Three Months Ended June 30, 2020 Topic 606 Not Topic 606 (1) Total Topic 606 Not Topic 606 (1) Total General Banking Segment Service charges on deposit accounts $ 7,591 $ — $ 7,591 $ 6,380 $ — $ 6,380 Bank card and other fees 8,519 (228 ) 8,291 6,549 1,160 7,709 Mortgage banking, net — 17,333 17,333 — 33,745 33,745 Wealth management 2 — 2 79 — 79 Other, net 1,699 251 1,950 1,354 784 2,138 Total noninterest income $ 17,811 $ 17,356 $ 35,167 $ 14,362 $ 35,689 $ 50,051 Wealth Management Segment Service charges on deposit accounts $ 22 $ — $ 22 $ 17 $ — $ 17 Bank card and other fees 10 — 10 8 — 8 Wealth management 8,944 — 8,944 7,492 — 7,492 Other, net 35 9 44 24 9 33 Total noninterest income $ 9,011 $ 9 $ 9,020 $ 7,541 $ 9 $ 7,550 Insurance Segment Insurance commissions $ 12,217 $ — $ 12,217 $ 11,868 $ — $ 11,868 Other, net 7 — 7 42 — 42 Total noninterest income $ 12,224 $ — $ 12,224 $ 11,910 $ — $ 11,910 Consolidated Service charges on deposit accounts $ 7,613 $ — $ 7,613 $ 6,397 $ — $ 6,397 Bank card and other fees 8,529 (228 ) 8,301 6,557 1,160 7,717 Mortgage banking, net — 17,333 17,333 — 33,745 33,745 Insurance commissions 12,217 — 12,217 11,868 — 11,868 Wealth management 8,946 — 8,946 7,571 — 7,571 Other, net 1,741 260 2,001 1,420 793 2,213 Total noninterest income $ 39,046 $ 17,365 $ 56,411 $ 33,813 $ 35,698 $ 69,511 (1) Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, accretion of the FDIC indemnification asset, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and security gains (losses), net . Six Months Ended June 30, 2021 Six Months Ended June 30, 2020 Topic 606 Not Topic 606 (1) Total Topic 606 Not Topic 606 (1) Total General Banking Segment Service charges on deposit accounts $ 14,929 $ — $ 14,929 $ 16,392 $ — $ 16,392 Bank card and other fees 15,703 2,052 17,755 13,275 (217 ) 13,058 Mortgage banking, net — 38,137 38,137 — 61,228 61,228 Wealth management 20 — 20 165 — 165 Other, net 3,087 891 3,978 3,118 1,266 4,384 Total noninterest income $ 33,739 $ 41,080 $ 74,819 $ 32,950 $ 62,277 $ 95,227 Wealth Management Segment Service charges on deposit accounts $ 40 $ — $ 40 $ 37 $ — $ 37 Bank card and other fees 18 — 18 14 — 14 Wealth management 17,342 — 17,342 15,943 — 15,943 Other, net 67 16 83 50 22 72 Total noninterest income $ 17,467 $ 16 $ 17,483 $ 16,044 $ 22 $ 16,066 Insurance Segment Insurance commissions $ 24,662 $ — $ 24,662 $ 23,418 $ — $ 23,418 Other, net 30 — 30 64 — 64 Total noninterest income $ 24,692 $ — $ 24,692 $ 23,482 $ — $ 23,482 Consolidated Service charges on deposit accounts $ 14,969 $ — $ 14,969 $ 16,429 $ — $ 16,429 Bank card and other fees 15,721 2,052 17,773 13,289 (217 ) 13,072 Mortgage banking, net — 38,137 38,137 — 61,228 61,228 Insurance commissions 24,662 — 24,662 23,418 — 23,418 Wealth management 17,362 — 17,362 16,108 — 16,108 Other, net 3,184 907 4,091 3,232 1,288 4,520 Total noninterest income $ 75,898 $ 41,096 $ 116,994 $ 72,476 $ 62,299 $ 134,775 (1) Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, accretion of the FDIC indemnification asset, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and security gains (losses), net.

Defined Benefit and Other Postr

Defined Benefit and Other Postretirement Benefits	6 Months Ended
	Jun. 30, 2021
Compensation And Retirement Disclosure [Abstract]
Defined Benefit and Other Postretirement Benefits	Note 10 – Defined Benefit and Other Postretirement Benefits Qualified Pension Plan Trustmark maintains a noncontributory tax-qualified defined benefit pension plan titled the Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions (the Continuing Plan) to satisfy commitments made by Trustmark to associates covered through plans obtained in acquisitions. The following table presents information regarding the net periodic benefit cost for the Continuing Plan for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Service cost $ 63 $ 63 $ 126 $ 127 Interest cost 43 61 86 121 Expected return on plan assets (32 ) (39 ) (65 ) (77 ) Recognized net loss due to lump sum settlements — 40 — 40 Recognized net actuarial loss 148 82 297 163 Net periodic benefit cost $ 222 $ 207 $ 444 $ 374 For the plan year ending December 31, 2021, Trustmark’s minimum required contribution to the Continuing Plan is $324 thousand; however, Management and the Board of Directors of Trustmark will monitor the Continuing Plan throughout 2021 to determine any additional funding requirements by the plan’s measurement date, which is December 31. Supplemental Retirement Plans Trustmark maintains a nonqualified supplemental retirement plan covering key executive officers and senior officers as well as directors who have elected to defer fees. The plan provides for retirement and/or death benefits based on a participant’s covered salary or deferred fees. Although plan benefits may be paid from Trustmark’s general assets, Trustmark has purchased life insurance contracts on the participants covered under the plan, which may be used to fund future benefit payments under the plan. The annual measurement date for the plan is December 31. As a result of mergers prior to 2014, Trustmark became the administrator of small nonqualified supplemental retirement plans, for which the plan benefits were frozen prior to the merger date. The following table presents information regarding the net periodic benefit cost for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Service cost $ 19 $ 20 $ 38 $ 39 Interest cost 277 387 570 801 Amortization of prior service cost 28 38 56 75 Recognized net actuarial loss 295 236 601 482 Net periodic benefit cost $ 619 $ 681 $ 1,265 $ 1,397

Stock and Incentive Compensatio

Stock and Incentive Compensation	6 Months Ended
	Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock and Incentive Compensation	Note 11 – Stock and Incentive Compensation Trustmark has granted stock and incentive compensation awards and units subject to the provisions of the Stock and Incentive Compensation Plan (the Stock Plan). Current outstanding and future grants of stock and incentive compensation awards are subject to the provisions of the Stock Plan, which is designed to provide flexibility to Trustmark regarding its ability to motivate, attract and retain the services of key associates and directors. The Stock Plan also allows Trustmark to grant nonqualified stock options, incentive stock options, stock appreciation rights, restricted stock, restricted stock units and performance units to key associates and directors. Restricted Stock Grants Performance Awards Trustmark’s performance awards vest over three years and are granted to Trustmark’s executive and senior management teams. Performance awards granted vest based on performance goals of return on average tangible equity and total shareholder return. Performance awards are valued utilizing a Monte Carlo simulation model to estimate fair value of the awards at the grant date. The Monte Carlo simulation was performed by an independent valuation consultant and requires the use of subjective modeling assumptions. These awards are recognized using the straight-line method over the requisite service period. These awards provide for achievement shares if performance measures exceed 100%. The restricted share agreement for these awards provides for voting rights and dividend privileges. During 2020, Trustmark began granting performance units instead of performance awards. The performance units have the same attributes as the previously granted performance awards, except the performance units do not provide voting rights. Time-Vested Awards Trustmark’s time-vested awards vest over three years and are granted to members of Trustmark’s Board of Directors as well as Trustmark’s executive and senior management teams. Time-vested awards are valued utilizing the fair value of Trustmark’s stock at the grant date. These awards are recognized on the straight-line method over the requisite service period. During 2020, Trustmark began granting time-vested units instead of time-vested awards. The time-vested units have the same attributes as the previously granted time-vested awards, except the time-vested units do not provide voting rights. The following tables summarize the Stock Plan activity for the periods presented: Three Months Ended June 30, 2021 Performance Awards and Units Time-Vested Awards and Units Nonvested shares, beginning of period 144,554 362,556 Granted — 2,750 Released from restriction — (8,846 ) Forfeited (2,585 ) (4,405 ) Nonvested shares, end of period 141,969 352,055 Six Months Ended June 30, 2021 Performance Awards and Units Time-Vested Awards and Units Nonvested shares, beginning of period 145,042 301,619 Granted 53,273 176,022 Released from restriction (44,536 ) (120,290 ) Forfeited (11,810 ) (5,296 ) Nonvested shares, end of period 141,969 352,055 The following table presents information regarding compensation expense for awards and units under the Stock Plan for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Performance awards and units $ 324 $ 456 $ 206 $ (57 ) Time-vested awards and units 890 818 3,189 2,725 Total compensation expense $ 1,214 $ 1,274 $ 3,395 $ 2,668

Contingencies

Contingencies	6 Months Ended
	Jun. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Contingencies	Note 12 – Contingencies Lending Related Trustmark makes commitments to extend credit and issues standby and commercial letters of credit (letters of credit) in the normal course of business in order to fulfill the financing needs of its customers. The carrying amount of commitments to extend credit and letters of credit approximates the fair value of such financial instruments. Commitments to extend credit are agreements to lend money to customers pursuant to certain specified conditions. Commitments generally have fixed expiration dates or other termination clauses. Because many of these commitments are expected to expire without being fully drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The exposure to credit loss in the event of nonperformance by the other party to the commitments to extend credit is represented by the contract amount of those instruments. Trustmark applies the same credit policies and standards as it does in the lending process when making these commitments. The collateral obtained is based upon the nature of the transaction and the assessed creditworthiness of the borrower. At June 30, 2021 and 2020, Trustmark had unused commitments to extend credit of $4.803 billion and $4.391 billion, respectively. Letters of credit are conditional commitments issued by Trustmark to insure the performance of a customer to a third-party. A financial standby letter of credit irrevocably obligates Trustmark to pay a third-party beneficiary when a customer fails to repay an outstanding loan or debt instrument. A performance standby letter of credit irrevocably obligates Trustmark to pay a third-party beneficiary when a customer fails to perform some contractual, nonfinancial obligation. When issuing letters of credit, Trustmark uses the same policies regarding credit risk and collateral, which are followed in the lending process. At June 30, 2021 and 2020, Trustmark’s maximum exposure to credit loss in the event of nonperformance by the customer for letters of credit was $132.2 million and $105.7 million, respectively. These amounts consist primarily of commitments with maturities of less than three years, which have an immaterial carrying value. Trustmark holds collateral to support standby letters of credit when deemed necessary. As of June 30, 2021 and 2020, the fair value of collateral held was $40.2 million and $21.8 million, respectively. ACL on Off-Balance Sheet Credit Exposures Trustmark maintains a separate ACL on off-balance sheet credit exposures, including unfunded loan commitments and letters of credit, which is included on the accompanying consolidated balance sheet as of June 30, 2021 and December 31, 2020. Changes in the ACL on off-balance sheet credit exposures were as follows for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Balance at beginning of period $ 29,205 $ 36,421 $ 38,572 $ — FASB ASU 2016-13 adoption adjustment — — — 29,638 PCL, off-balance sheet credit exposures (1) 4,528 6,242 (4,839 ) 13,025 Balance at end of period $ 33,733 $ 42,663 $ 33,733 $ 42,663 (1) During the second quarter of 2021, Trustmark reclassified its credit loss expense related to off-balance sheet credit exposures from noninterest expense to provision for credit losses, off-balance sheet credit exposures. Prior periods have been reclassified accordingly. Adjustments to the ACL on off-balance sheet credit exposures are recorded to provision for credit losses, off-balance sheet credit exposures. The increase in the ACL on off-balance sheet credit exposures for the second quarter of 2021 was primarily due to an increase in the off-balance sheet credit exposures as well as the implementation of the PD and LGD floors by portfolio. The decrease in the ACL on off-balance sheet credit exposures for the six months ended June 30, 2021 was primarily due to improvements of the overall economy and macroeconomic factors used to determine the necessary reserves for off-balance sheet credit exposures. No credit loss estimate is reported for off-balance sheet credit exposures that are unconditionally cancellable by Trustmark or for undrawn amounts under such arrangements that may be drawn prior to the cancellation of the arrangement. Legal Proceedings Trustmark’s wholly-owned subsidiary, TNB, has been named as a defendant in several lawsuits related to the collapse of the Stanford Financial Group. On August 23, 2009, a purported class action complaint was filed in the District Court of Harris County, Texas, by Peggy Roif Rotstain, Guthrie Abbott, Catherine Burnell, Steven Queyrouze, Jaime Alexis Arroyo Bornstein and Juan C. Olano (collectively, Class Plaintiffs), on behalf of themselves and all others similarly situated, naming TNB and four other financial institutions and one individual, each of which are unaffiliated with Trustmark, as defendants. The complaint seeks to recover (i) alleged fraudulent transfers from each of the defendants in the amount of fees and other monies received by each defendant from entities controlled by R. Allen Stanford (collectively, the Stanford Financial Group) and (ii) damages allegedly attributable to alleged conspiracies by one or more of the defendants with the Stanford Financial Group to commit fraud and/or aid and abet fraud on the asserted grounds that defendants knew or should have known the Stanford Financial Group was conducting an illegal and fraudulent scheme. Class Plaintiffs have demanded a jury trial. Class Plaintiffs did not quantify damages. In November 2009, the lawsuit was removed to federal court by certain defendants and then transferred by the United States Panel on Multidistrict Litigation to federal court in the Northern District of Texas (Dallas) where multiple Stanford related matters are being consolidated for pre-trial proceedings. In May 2010, all defendants (including TNB) filed motions to dismiss the lawsuit. In August 2010, the court authorized and approved the formation of an Official Stanford Investors Committee (OSIC) to represent the interests of Stanford investors and, under certain circumstances, to file legal actions for the benefit of Stanford investors. In December 2011, the OSIC filed a motion to intervene in this action. In September 2012, the district court referred the case to a magistrate judge for hearing and determination of certain pretrial issues. In December 2012, the court granted the OSIC’s motion to intervene, and the OSIC filed an Intervenor Complaint against one of the other defendant financial institutions. In February 2013, the OSIC filed a second Intervenor Complaint that asserts claims against TNB and the remaining defendant financial institutions. The OSIC seeks to recover: (i) alleged fraudulent transfers in the amount of the fees each of the defendants allegedly received from Stanford Financial Group, the profits each of the defendants allegedly made from Stanford Financial Group deposits, and other monies each of the defendants allegedly received from Stanford Financial Group; (ii) damages attributable to alleged conspiracies by each of the defendants with the Stanford Financial Group to commit fraud and/or aid and abet fraud and conversion on the asserted grounds that the defendants knew or should have known the Stanford Financial Group was conducting an illegal and fraudulent scheme; and (iii) punitive damages. The OSIC did not quantify damages. In July 2013, all defendants (including TNB) filed motions to dismiss the OSIC’s claims. In March 2015, the court entered an order authorizing the parties to conduct discovery regarding class certification, staying all other discovery and setting a deadline for the parties to complete briefing on class certification issues. In April 2015, the court granted in part and denied in part the defendants’ motions to dismiss the Class Plaintiffs’ claims and the OSIC’s claims. The court dismissed all of the Class Plaintiffs’ fraudulent transfer claims and dismissed certain of the OSIC’s claims. The court denied the motions by TNB and the other financial institution defendants to dismiss the OSIC’s constructive fraudulent transfer claims. On June 23, 2015, the court allowed the Class Plaintiffs to file a Second Amended Class Action Complaint (SAC), which asserted new claims against TNB and certain of the other defendants for (i) aiding, abetting and participating in a fraudulent scheme, (ii) aiding, abetting and participating in violations of the Texas Securities Act, (iii) aiding, abetting and participating in breaches of fiduciary duty, (iv) aiding, abetting and participating in conversion and (v) conspiracy. On July 14, 2015, the defendants (including TNB) filed motions to dismiss the SAC and to reconsider the court’s prior denial to dismiss the OSIC’s constructive fraudulent transfer claims against TNB and the other financial institutions that are defendants in the action. On July 27, 2016, the court denied the motion by TNB and the other financial institution defendants to dismiss the SAC and also denied the motion by TNB and the other financial institution defendants to reconsider the court’s prior denial to dismiss the OSIC’s constructive fraudulent transfer claims. On August 24, 2016, TNB filed its answer to the SAC. On October 20, 2017, the OSIC filed a motion seeking an order lifting the discovery stay and establishing a trial schedule. On November 4, 2016, the OSIC filed a First Amended Intervenor Complaint, which added claims for (i) aiding, abetting or participation in violations of the Texas Securities Act and (ii) aiding, abetting or participation in the breach of fiduciary duty. On November 7, 2017, the court denied the Class Plaintiffs’ motion seeking class certification and designation of class representatives and counsel, finding that common issues of fact did not predominate. The court granted the OSIC’s motion to lift the discovery stay that it had previously ordered. On May 3, 2019, individual investors and entities filed motions to intervene in the action. On September 18, 2019, the court denied the motions to intervene. On October 14, 2019, certain of the proposed intervenors filed a notice of appeal. On February 3, 2021, the Fifth Circuit Court of Appeals affirmed the denial of the motions to intervene; this decision was affirmed by a panel of the Fifth Circuit on March 12, 2021. On February 12, 2021, all defendants (including TNB) filed a motion for summary judgment with respect to OSIC claims that applied to all defendants. In addition, on the same date, TNB filed a separate motion for summary judgment with respect to aspects of OSIC claims that applied specifically to TNB. On March 19, 2021, OSIC filed notice with the court that it was abandoning as against all of the defendants (including TNB) the five claims described above. As a result, only the claims for (i) aiding, abetting and participating in breaches of fiduciary duty, (ii) aiding, abetting and participating in violations of the Texas Securities Act, and (iii) punitive damages remain as against TNB. On March 19, 2021, OSIC also filed responses to defendants’ motions for summary judgment. Briefing on the defendants’ (including TNB’s) summary judgment motions in respect of these remaining claims continues. The parties to the action have agreed that the case is to be tried in the District Court for the Southern District of Texas, and it is Trustmark’s understanding that the judge of the District Court for the Northern District of Texas to whom the case is currently assigned has agreed to this transfer, but he has yet to formally remand the case to the Southern District of Texas. However, on March 25, 2021, the judge to whom the case is currently assigned in the District Court for the Northern District of Texas rescinded his previously-issued trial scheduling orders so that the Southern District of Texas could set scheduling for this case once the case has in fact been remanded. On December 14, 2009, a different Stanford-related lawsuit was filed in the District Court of Ascension Parish, Louisiana, individually by Harold Jackson, Paul Blaine and Carolyn Bass Smith, Christine Nichols, and Ronald and Ramona Hebert naming TNB (misnamed as Trust National Bank) and other individuals and entities not affiliated with Trustmark as defendants. The complaint seeks to recover the money lost by these individual plaintiffs as a result of the collapse of the Stanford Financial Group (in addition to other damages) under various theories and causes of action, including negligence, breach of contract, breach of fiduciary duty, negligent misrepresentation, detrimental reliance, conspiracy, and violation of Louisiana’s uniform fiduciary, securities, and racketeering laws. The complaint does not quantify the amount of money the plaintiffs seek to recover. In January 2010, the lawsuit was removed to federal court by certain defendants and then transferred by the United States Panel on Multidistrict Litigation to federal court in the Northern District of Texas (Dallas) where multiple Stanford related matters are being consolidated for pre-trial proceedings. On March 29, 2010, the court stayed the case. TNB filed a motion to lift the stay, which was denied on February 28, 2012. In September 2012, the district court referred the case to a magistrate judge for hearing and determination of certain pretrial issues. On April 11, 2016, Trustmark learned that a different Stanford-related lawsuit had been filed on that date in the Superior Court of Justice in Ontario, Canada, by The Toronto-Dominion Bank (“TD Bank”), naming TNB and three other financial institutions not affiliated with Trustmark as defendants (the “TD Bank Declaratory Action”). The complaint seeks a declaration specifying the degree to which each of TNB and the other defendants are liable in respect of any loss and damage for which TD Bank is found to be liable in separate litigation commenced against TD Bank brought by the joint liquidators of Stanford International Bank Limited in the Superior Court of Justice, Commercial List in Ontario, Canada (the “Joint Liquidators’ Action”), as well as contribution and indemnity in respect of any judgment, interest and costs TD Bank is ordered to pay in the Joint Liquidators’ Action. Trustmark understands that on or about June 8, 2021, after an extensive trial on the merits, the judge in the Joint Liquidators’ Action ruled in favor of TD Bank and found TD Bank not liable as to the claims asserted against the bank by the joint liquidators of Stanford International Bank Limited. It is not yet known whether the plaintiffs in the Joint Liquidators’ Action intend to appeal this decision. TNB was never served in connection with the TD Bank Declaratory Action , and thus did not make an appearance in that action. On November 1, 2019, TNB was named as a defendant in a complaint filed by Paul Blaine Smith, Carolyn Bass Smith and other plaintiffs identified therein (the Smith Complaint). The Smith Complaint was filed in Texas state court (District Court, Harris County, Texas) and named TNB and four other financial institutions and one individual, each of which are unaffiliated with Trustmark, as defendants. The Smith Complaint relates to the collapse of the Stanford Financial Group, as does the other pending litigation relating to Stanford summarized above. Plaintiffs in the Smith Complaint have demanded a jury trial. On January 15, 2020, the court granted Stanford Financial Group receiver’s motion to stay the Texas state court action. On February 26, 2020, the lawsuit was removed to federal court in the Southern District of Texas by TNB. Trustmark and its counsel are carefully evaluating the Smith Complaint in the form that is publicly available, and will update the foregoing description to the extent that additional material facts are ascertained. TNB’s relationship with the Stanford Financial Group began as a result of Trustmark’s acquisition of a Houston-based bank in August 2006, and consisted of correspondent banking and other traditional banking services in the ordinary course of business. All Stanford-related lawsuits are in pre-trial stages. On December 30, 2019, a complaint was filed in the United States District Court for the Southern District of Mississippi, Northern Division by Alysson Mills in her capacity as Court-appointed Receiver (the Receiver) for Arthur Lamar Adams (Adams) and Madison Timber Properties, LLC (Madison Timber), naming TNB, two other Mississippi-based financial institutions both of which are unaffiliated with Trustmark and two individuals, one of who was employed by TNB at all times relevant to the complaint and the other was employed either by TNB or one of the other defendant financial institutions, as defendants. The complaint seeks to recover from the defendants, for the benefit of the receivership estate and also for certain investors who were allegedly defrauded by Adams and Madison Timber, damages (including punitive damages) and related costs allegedly attributable to actions of the defendants that allegedly enabled illegal and fraudulent activities engaged in by Adams and Madison Timber. The Receiver did not quantify damages. Pursuant to a Case Management Order issued by the court on June 16, 2021, a trial date of October 17, 2022 has been set for this action, if the parties are not otherwise able to resolve this matter prior to that date. TNB’s relationship with Adams and Madison Timber consisted of traditional banking services in the ordinary course of business. Trustmark and its subsidiaries are also parties to other lawsuits and other claims that arise in the ordinary course of business. Some of the lawsuits assert claims related to the lending, collection, servicing, investment, trust and other business activities, and some of the lawsuits allege substantial claims for damages. All pending legal proceedings described above (save for the TD Bank Declaratory Action, in which, as noted above, Trustmark has never been served) are being vigorously contested. In accordance with FASB ASC Subtopic 450-20, “Loss Contingencies,” Trustmark will establish an accrued liability for litigation matters when those matters present loss contingencies that are both probable and reasonably estimable. At the present time, Trustmark believes, based on its evaluation and the advice of legal counsel, that a loss in any such proceeding is not probable and a reasonable estimate cannot reasonably be made.

Earnings Per Share (EPS)

Earnings Per Share (EPS)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Earnings Per Share (EPS)	Note 13 – Earnings Per Share (EPS) The following table reflects weighted-average shares used to calculate basic and diluted EPS for the periods presented (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Basic shares 63,215 63,416 63,305 63,586 Dilutive shares 195 139 161 136 Diluted shares 63,410 63,555 63,466 63,722 Weighted-average antidilutive stock awards were excluded in determining diluted EPS. The following table reflects weighted-average antidilutive stock awards for the periods presented (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Weighted-average antidilutive stock awards 1 11 77 63

Statements of Cash Flows

Statements of Cash Flows	6 Months Ended
	Jun. 30, 2021
Supplemental Cash Flow Information [Abstract]
Statements of Cash Flows	Note 14 – Statements of Cash Flows The following table reflects specific transaction amounts for the periods presented ($ in thousands): Six Months Ended June 30, 2021 2020 Income taxes paid $ 13,045 $ 23,309 Interest expense paid on deposits and borrowings 13,815 26,808 Noncash transfers from loans to other real estate 382 406 Finance right-of-use assets resulting from lease liabilities 92 — Operating right-of-use assets resulting from lease liabilities 4,278 671

Shareholders' Equity

Shareholders' Equity	6 Months Ended
	Jun. 30, 2021
Stockholders Equity Note [Abstract]
Shareholders' Equity	Note 15 – Shareholders’ Equity Regulatory Capital Trustmark and TNB are subject to minimum risk-based capital and leverage capital requirements, as described in the section captioned “Capital Adequacy” included in Part I. Item 1. – Business of Trustmark’s 2020 Annual Report, which are administered by the federal bank regulatory agencies. These capital requirements, as defined by federal regulations, involve quantitative and qualitative measures of assets, liabilities and certain off-balance sheet instruments. Trustmark’s and TNB’s minimum risk-based capital requirements include a capital conservation buffer of 2.50% at June 30, 2021 and December 31, 2020. Accumulated other comprehensive income (loss), net of tax, is not included in computing regulatory capital. Trustmark has elected the five-year phase-in transition period (through December 31, 2024) related to adopting FASB ASU 2016-13 for regulatory capital purposes. Failure to meet minimum capital requirements can result in certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the financial statements of Trustmark and TNB and limit Trustmark’s and TNB’s ability to pay dividends. As of June 30, 2021, Trustmark and TNB exceeded all applicable minimum capital standards. In addition, Trustmark and TNB met applicable regulatory guidelines to be considered well-capitalized at June 30, 2021. To be categorized in this manner, Trustmark and TNB maintained, as applicable, minimum common equity Tier 1 risk-based capital, Tier 1 risk-based capital, total risk-based capital and Tier 1 leverage ratios as set forth in the accompanying table, and were not subject to any written agreement, order or capital directive, or prompt corrective action directive issued by their primary federal regulators to meet and maintain a specific capital level for any capital measures. There are no significant conditions or events that have occurred since June 30, 2021, which Management believes have affected Trustmark’s or TNB’s present classification. The following table provides Trustmark’s and TNB’s actual regulatory capital amounts and ratios under regulatory capital standards in effect at June 30, 2021 and December 31, 2020 ($ in thousands): Actual Regulatory Capital Minimum To Be Well Amount Ratio Requirement Capitalized At June 30, 2021: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,441,102 11.76 % 7.00 % n/a Trustmark National Bank 1,491,066 12.17 % 7.00 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,501,102 12.25 % 8.50 % n/a Trustmark National Bank 1,491,066 12.17 % 8.50 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,728,478 14.10 % 10.50 % n/a Trustmark National Bank 1,595,510 13.02 % 10.50 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,501,102 9.00 % 4.00 % n/a Trustmark National Bank 1,491,066 8.96 % 4.00 % 5.00 % At December 31, 2020: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,395,844 11.62 % 7.00 % n/a Trustmark National Bank 1,412,015 11.75 % 7.00 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,455,844 12.11 % 8.50 % n/a Trustmark National Bank 1,412,015 11.75 % 8.50 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,696,794 14.12 % 10.50 % n/a Trustmark National Bank 1,530,044 12.73 % 10.50 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,455,844 9.33 % 4.00 % n/a Trustmark National Bank 1,412,015 9.07 % 4.00 % 5.00 % Stock Repurchase Program On April 1, 2019, the Board of Directors of Trustmark authorized a stock repurchase program under which $100.0 million of Trustmark’s outstanding common stock could be acquired through March 31, 2020. Trustmark repurchased approximately 887 thousand shares of its common stock valued at $27.5 million during the three months ended March 31, 2020. Under this authority, Trustmark repurchased approximately 1.5 million shares valued at $47.2 million. On January 28, 2020, the Board of Directors of Trustmark authorized a new stock repurchase program, effective April 1, 2020, under which $100.0 million of Trustmark’s outstanding common stock may be acquired through December 31, 2021. On March 9, 2020, Trustmark suspended its share repurchase programs to preserve capital to support customers during the COVID-19 pandemic. Trustmark resumed the repurchase of its shares in January 2021. Under this authority, Trustmark repurchased approximately 630 thousand shares of its outstanding common stock valued at $20.8 million during three months ended June 30, 2021. During the first six months of 2021, Trustmark repurchased $25.0 million, or approximately 775 thousand shares of its outstanding common stock. Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss) The following tables present the net change in the components of accumulated other comprehensive income (loss) and the related tax effects allocated to each component for the periods presented ($ in thousands). The amortization of prior service cost, recognized net loss due to lump sum settlements and change in net actuarial loss are included in the computation of net periodic benefit cost (see Note 10 – Defined Benefit and Other Postretirement Benefits for additional details). Reclassification adjustments related to pension and other postretirement benefit plans are included in salaries and employee benefits and other expense in the accompanying consolidated statements of income. Three Months Ended June 30, 2021 Three Months Ended June 30, 2020 Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising during the period $ 6,612 $ (1,653 ) $ 4,959 $ 2,648 $ (662 ) $ 1,986 Change in net unrealized holding loss on securities transferred to held to maturity 736 (184 ) 552 778 (195 ) 583 Total securities available for sale and transferred securities 7,348 (1,837 ) 5,511 3,426 (857 ) 2,569 Pension and other postretirement benefit plans: Reclassification adjustments for changes realized in net income: Net change in prior service costs 28 (7 ) 21 38 (10 ) 28 Recognized net loss due to lump sum settlements — — — 40 (10 ) 30 Change in net actuarial loss 443 (110 ) 333 318 (78 ) 240 Total pension and other postretirement benefit plans 471 (117 ) 354 396 (98 ) 298 Total other comprehensive income (loss) $ 7,819 $ (1,954 ) $ 5,865 $ 3,822 $ (955 ) $ 2,867 Six Months Ended June 30, 2021 Six Months Ended June 30, 2020 Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising during the period $ (15,188 ) $ 3,797 $ (11,391 ) $ 43,155 $ (10,789 ) $ 32,366 Change in net unrealized holding loss on securities transferred to held to maturity 1,447 (362 ) 1,085 1,639 (410 ) 1,229 Total securities available for sale and transferred securities (13,741 ) 3,435 (10,306 ) 44,794 (11,199 ) 33,595 Pension and other postretirement benefit plans: Reclassification adjustments for changes realized in net income: Net change in prior service costs 56 (14 ) 42 75 (19 ) 56 Recognized net loss due to lump sum settlements — — — 40 (10 ) 30 Change in net actuarial loss 898 (224 ) 674 645 (161 ) 484 Total pension and other postretirement benefit plans 954 (238 ) 716 760 (190 ) 570 Total other comprehensive income (loss) $ (12,787 ) $ 3,197 $ (9,590 ) $ 45,554 $ (11,389 ) $ 34,165 The following table presents the changes in the balances of each component of accumulated other comprehensive income (loss) for the periods presented ($ in thousands). All amounts are presented net of tax. Securities Available and Transferred Securities Defined Benefit Pension Items Total Balance at January 1, 2021 $ 17,331 $ (18,382 ) $ (1,051 ) Other comprehensive income (loss) before reclassification (10,306 ) — (10,306 ) Amounts reclassified from accumulated other comprehensive income (loss) — 716 716 Net other comprehensive income (loss) (10,306 ) 716 (9,590 ) Balance at June 30, 2021 $ 7,025 $ (17,666 ) $ (10,641 ) Balance at January 1, 2020 $ (8,017 ) $ (15,583 ) $ (23,600 ) Other comprehensive income (loss) before reclassification 33,595 — 33,595 Amounts reclassified from accumulated other comprehensive income (loss) — 570 570 Net other comprehensive income (loss) 33,595 570 34,165 Balance at June 30, 2020 $ 25,578 $ (15,013 ) $ 10,565

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Fair Value	Note 16 – Fair Value Financial Instruments Measured at Fair Value The methodologies Trustmark uses in determining the fair values are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected upon exchange of the position in an orderly transaction between market participants at the measurement date. The predominant portion of assets that are stated at fair value are of a nature that can be valued using prices or inputs that are readily observable through a variety of independent data providers. The providers selected by Trustmark for fair valuation data are widely recognized and accepted vendors whose evaluations support the pricing functions of financial institutions, investment and mutual funds, and portfolio managers. Trustmark has documented and evaluated the pricing methodologies used by the vendors and maintains internal processes that regularly test valuations for anomalies. Trustmark utilizes an independent pricing service to advise it on the carrying value of the securities available for sale portfolio. As part of Trustmark’s procedures, the price provided from the service is evaluated for reasonableness given market changes. When a questionable price exists, Trustmark investigates further to determine if the price is valid. If needed, other market participants may be utilized to determine the correct fair value. Trustmark has also reviewed and confirmed its determinations in thorough discussions with the pricing source regarding their methods of price discovery. Mortgage loan commitments are valued based on the securities prices of similar collateral, term, rate and delivery for which the loan is eligible to deliver in place of the particular security. Trustmark acquires a broad array of mortgage security prices that are supplied by a market data vendor, which in turn accumulates prices from a broad list of securities dealers. Prices are processed through a mortgage pipeline management system that accumulates and segregates all loan commitment and forward-sale transactions according to the similarity of various characteristics (maturity, term, rate, and collateral). Prices are matched to those positions that are deemed to be an eligible substitute or offset ( i.e Trustmark estimates fair value of the MSR through the use of prevailing market participant assumptions and market participant valuation processes. This valuation is periodically tested and validated against other third-party firm valuations. Trustmark obtains the fair value of interest rate swaps from a third-party pricing service that uses an industry standard discounted cash flow methodology. In addition, credit valuation adjustments are incorporated in the fair values to account for potential nonperformance risk. In adjusting the fair value of its interest rate swap contracts for the effect of nonperformance risk, Trustmark has considered any applicable credit enhancements such as collateral postings, thresholds, mutual puts, and guarantees. In conjunction with the FASB’s fair value measurement guidance, Trustmark made an accounting policy election to measure the credit risk of these derivative financial instruments, which are subject to master netting agreements, on a net basis by counterparty portfolio. Trustmark has determined that the majority of the inputs used to value its interest rate swaps offered to qualified commercial borrowers fall within Level 2 of the fair value hierarchy, while the credit valuation adjustments associated with these derivatives utilize Level 3 inputs, such as estimates of current credit spreads. Trustmark has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its interest rate swaps and has determined that the credit valuation adjustment is not significant to the overall valuation of these derivatives. As a result, Trustmark classifies its interest rate swap valuations in Level 2 of the fair value hierarchy. Trustmark also utilizes exchange-traded derivative instruments such as Treasury note futures contracts and option contracts to achieve a fair value return that offsets the changes in fair value of the MSR attributable to interest rates. Fair values of these derivative instruments are determined from quoted prices in active markets for identical assets therefore allowing them to be classified within Level 1 of the fair value hierarchy. In addition, Trustmark utilizes derivative instruments such as interest rate lock commitments in its mortgage banking area which lack observable inputs for valuation purposes resulting in their inclusion in Level 3 of the fair value hierarchy. At this time, Trustmark presents no fair values that are derived through internal modeling. Should positions requiring fair valuation arise that are not relevant to existing methodologies, Trustmark will make every reasonable effort to obtain market participant assumptions, or independent evaluation. Financial Assets and Liabilities The following tables summarize financial assets and financial liabilities measured at fair value on a recurring basis at June 30, 2021 and December 31, 2020, segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value ($ in thousands). There were no transfers between fair value levels for the six months ended June 30, 2021 and the year ended December 31, 2020. June 30, 2021 Total Level 1 Level 2 Level 3 U.S. Treasury securities $ 30,025 $ 30,025 $ — $ — U.S. Government agency obligations 16,023 — 16,023 — Obligations of states and political subdivisions 5,807 — 5,807 — Mortgage-backed securities 2,496,884 — 2,496,884 — Securities available for sale 2,548,739 30,025 2,518,714 — Loans held for sale 332,132 — 332,132 — Mortgage servicing rights 80,764 — — 80,764 Other assets - derivatives 32,172 1,981 26,306 3,885 Other liabilities - derivatives 3,532 233 3,299 — December 31, 2020 Total Level 1 Level 2 Level 3 U.S. Government agency obligations $ 18,041 $ — $ 18,041 $ — Obligations of states and political subdivisions 5,835 — 5,835 — Mortgage-backed securities 1,967,939 — 1,967,939 — Securities available for sale 1,991,815 — 1,991,815 — Loans held for sale 446,951 — 446,951 — Mortgage servicing rights 66,464 — — 66,464 Other assets - derivatives 47,768 145 38,063 9,560 Other liabilities - derivatives 5,324 666 4,658 — The changes in Level 3 assets measured at fair value on a recurring basis for the six months ended June 30, 2021 and 2020 are summarized as follows ($ in thousands): MSR Other Assets - Derivatives Balance, January 1, 2021 $ 66,464 $ 9,560 Total net (loss) gain included in Mortgage banking, net (1) (901 ) 5,857 Additions 15,201 — Sales — (11,532 ) Balance, June 30, 2021 $ 80,764 $ 3,885 The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held at June 30, 2021 $ 9,231 $ 2,592 Balance, January 1, 2020 $ 79,394 $ 1,439 Total net (loss) gain included in Mortgage banking, net (1) (33,979 ) 22,382 Additions 12,396 — Sales — (9,491 ) Balance, June 30, 2020 $ 57,811 $ 14,330 The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held at June 30, 2020 $ (27,158 ) $ 12,897 (1) Total net (loss) gain included in Mortgage banking, net relating to the MSR includes changes in fair value due to market changes and due to run-off. Trustmark may be required, from time to time, to measure certain assets at fair value on a nonrecurring basis in accordance with GAAP. Assets at June 30, 2021, which have been measured at fair value on a nonrecurring basis, include collateral-dependent LHFI. A loan is collateral dependent when the borrower is experiencing financial difficulty and repayment of the loan is expected to be provided substantially through the sale of the collateral. The expected credit loss for collateral-dependent loans is measured as the difference between the amortized cost basis of the loan and the fair value of the collateral, adjusted for the estimated cost to sell. Fair value estimates for collateral-dependent loans are derived from appraised values based on the current market value or as is value of the collateral, normally from recently received and reviewed appraisals. Current appraisals are ordered on an annual basis based on the inspection date or more often if market conditions necessitate. Appraisals are obtained from state-certified appraisers and are based on certain assumptions, which may include construction or development status and the highest and best use of the property. These appraisals are reviewed by Trustmark’s Appraisal Review Department to ensure they are acceptable, and values are adjusted down for costs associated with asset disposal. At June 30, 2021, Trustmark had outstanding balances of $32.9 million with a related ACL of $4.2 million in collateral-dependent LHFI, compared to outstanding balances of $43.4 million with a related ACL of $4.4 million in collateral-dependent LHFI at December 31, 2020. The collateral-dependent LHFI are classified as Level 3 in the fair value hierarchy. Nonfinancial Assets and Liabilities Certain nonfinancial assets measured at fair value on a nonrecurring basis include foreclosed assets (upon initial recognition or subsequent impairment), nonfinancial assets and nonfinancial liabilities measured at fair value in the second step of a goodwill impairment test, and intangible assets and other nonfinancial long-lived assets measured at fair value for impairment assessment. Other real estate includes assets that have been acquired in satisfaction of debt through foreclosure and is recorded at the fair value less cost to sell (estimated fair value) at the time of foreclosure. Fair value is based on independent appraisals and other relevant factors. In the determination of fair value subsequent to foreclosure, Management also considers other factors or recent developments, such as changes in market conditions from the time of valuation and anticipated sales values considering plans for disposition, which could result in an adjustment to lower the collateral value estimates indicated in the appraisals. Periodic revaluations are classified as Level 3 in the fair value hierarchy since assumptions are used that may not be observable in the market. Foreclosed assets of $5.3 million were remeasured during the first six months of 2021, requiring write-downs of $268 thousand to reach their current fair values compared to $3.2 million of foreclosed assets that were remeasured during the first six months of 2020, requiring write-downs of $873 thousand. Fair Value of Financial Instruments FASB ASC Topic 825, “Financial Instruments,” requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis. The carrying amounts and estimated fair values of financial instruments at June 30, 2021 and December 31, 2020, are as follows ($ in thousands): June 30, 2021 December 31, 2020 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial Assets: Level 2 Inputs: Cash and short-term investments $ 2,267,224 $ 2,267,224 $ 1,952,554 $ 1,952,554 Securities held to maturity 433,012 452,288 538,072 563,115 Level 3 Inputs: Net LHFI and PPP loans 10,214,956 10,183,509 10,317,352 10,312,395 Financial Liabilities: Level 2 Inputs: Deposits 14,632,084 14,633,322 14,048,764 14,052,863 Federal funds purchased and securities sold under repurchase agreements 157,176 157,176 164,519 164,519 Other borrowings 117,223 117,221 168,252 168,252 Subordinated notes 122,932 128,750 122,921 127,500 Junior subordinated debt securities 61,856 48,866 61,856 46,083 Fair Value Option Trustmark has elected to account for its mortgage LHFS under the fair value option, with interest income on these mortgage LHFS reported in interest and fees on LHFS and LHFI. The fair value of the mortgage LHFS is determined using quoted prices for a similar asset, adjusted for specific attributes of that loan. The mortgage LHFS are actively managed and monitored and certain market risks of the loans may be mitigated through the use of derivatives. These derivative instruments are carried at fair value with changes in fair value recorded as noninterest income in mortgage banking, net. The changes in the fair value of LHFS are largely offset by changes in the fair value of the derivative instruments. For the three and six months ended June 30, 2021, a net gain of $2.3 million and a net loss of $8.3 million, respectively, were recorded as noninterest income in mortgage banking, net for changes in the fair value of LHFS accounted for under the fair value option, compared to a net loss of $445 thousand and a net gain of $7.3 million for the three and six months ended June 30, 2020, respectively. Interest and fees on LHFS and LHFI for the three and six months ended June 30, 2021 included $1.7 million and $3.8 million, respectively, of interest earned on LHFS accounted for under the fair value option, compared to $1.5 million and $2.8 million for the three and six months ended June 30, 2020, respectively. Election of the fair value option allows Trustmark to reduce the accounting volatility that would otherwise result from the asymmetry created by accounting for the financial instruments at the lower of cost or fair value and the derivatives at fair value. The fair value option election does not apply to GNMA optional repurchase loans which do not meet the requirements under FASB ASC Topic 825 to be accounted for under the fair value option. GNMA optional repurchase loans totaled $95.4 million and $141.2 million at June 30, 2021 and December 31, 2020, respectively, and are included in LHFS on the accompanying consolidated balance sheets. For additional information regarding GNMA optional repurchase loans, please see the section captioned “Past Due LHFS” included in Note 3 – LHFI and Allowance for Credit Losses, LHFI. The following table provides information about the fair value and the contractual principal outstanding of LHFS accounted for under the fair value option as of June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 December 31, 2020 Fair value of LHFS $ 236,719 $ 305,791 LHFS contractual principal outstanding 229,631 290,625 Fair value less unpaid principal $ 7,088 $ 15,166

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Note 17 – Derivative Financial Instruments Derivatives not Designated as Hedging Instruments Trustmark utilizes a portfolio of exchange-traded derivative instruments, such as Treasury note futures contracts and option contracts, to achieve a fair value return that economically hedges changes in the fair value of the MSR attributable to interest rates. These transactions are considered freestanding derivatives that do not otherwise qualify for hedge accounting. The total notional amount of these derivative instruments was $374.5 million at June 30, 2021 compared to $326.5 million at December 31, 2020. Changes in the fair value of these exchange-traded derivative instruments are recorded as noninterest income in mortgage banking, net and are offset by changes in the fair value of the MSR. The impact of this strategy resulted in a net positive ineffectiveness of $1.3 million and a net negative ineffectiveness of $2.0 million for the three months ended June 30, 2021 and 2020, respectively. For the six months ended June 30, 2021 and 2020, the impact was a net positive ineffectiveness of $1.5 million and $7.9 million, respectively. As part of Trustmark’s risk management strategy in the mortgage banking area, derivative instruments such as forward sales contracts are utilized. Trustmark’s obligations under forward sales contracts consist of commitments to deliver mortgage loans, originated and/or purchased, in the secondary market at a future date. Changes in the fair value of these derivative instruments are recorded as noninterest income in mortgage banking, net and are offset by changes in the fair value of LHFS. Trustmark’s off-balance sheet obligations under these derivative instruments totaled $317.5 million at June 30, 2021, with a negative valuation adjustment of $587 thousand, compared to $377.5 million, with a negative valuation adjustment of $3.1 million, at December 31, 2020. Trustmark also utilizes derivative instruments such as interest rate lock commitments in its mortgage banking area. Interest rate lock commitments are residential mortgage loan commitments with customers, which guarantee a specified interest rate for a specified time period. Changes in the fair value of these derivative instruments are recorded as noninterest income in mortgage banking, net and are offset by the changes in the fair value of forward sales contracts. Trustmark’s off-balance sheet obligations under these derivative instruments totaled $238.8 million at June 30, 2021, with a positive valuation adjustment of $3.9 million, compared to $329.3 million, with a positive valuation adjustment of $9.6 million, at December 31, 2020. Trustmark offers certain derivatives products directly to qualified commercial lending clients seeking to manage their interest rate risk. Trustmark economically hedges interest rate swap transactions executed with commercial lending clients by entering into offsetting interest rate swap transactions with institutional derivatives market participants. Derivatives transactions executed as part of this program are not designated as qualifying hedging relationships and are, therefore, carried at fair value with the change in fair value recorded as noninterest income in bank card and other fees. Because these derivatives have mirror-image contractual terms, in addition to collateral provisions which mitigate the impact of non-performance risk, the changes in fair value are expected to substantially offset. The Chicago Mercantile Exchange rules legally characterize variation margin collateral payments made or received for centrally cleared interest rate swaps as settlements rather than collateral. As a result, centrally cleared interest rate swaps included in other assets and other liabilities are presented on a net basis in the accompanying consolidated balance sheets. At June 30, 2021, Trustmark had interest rate swaps with an aggregate notional amount of $1.115 billion related to this program, compared to $1.125 billion at December 31, 2020. Credit-risk-related Contingent Features Trustmark has agreements with its financial institution counterparties that contain provisions where if Trustmark defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then Trustmark could also be declared in default on its derivatives obligations. At June 30, 2021 and December 31, 2020, the termination value of interest rate swaps in a liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $950 thousand and $1.3 million, respectively. At June 30, 2021, Trustmark had posted collateral of $1.1 million against its obligations because of negotiated thresholds and minimum transfer amounts under these agreements. If Trustmark had breached any of these triggering provisions at June 30, 2021, it could have been required to settle its obligations under the agreements at the termination value. Credit risk participation agreements arise when Trustmark contracts with other financial institutions, as a guarantor or beneficiary, to share credit risk associated with certain interest rate swaps. These agreements provide for reimbursement of losses resulting from a third-party default on the underlying swap. At June 30, 2021, Trustmark had entered into six risk participation agreements as a beneficiary with an aggregate notional amount of $50.3 million compared to three risk participation agreements as a beneficiary with an aggregate notional amount of $41.1 million at December 31, 2020. At both June 30, 2021 and December 31, 2020, Trustmark had entered into twenty-four risk participation agreements as a guarantor with an aggregate notional amount of $174.2 million and $172.0 million, respectively. The aggregate fair values of these risk participation agreements were immaterial at both June 30, 2021 and December 31, 2020. Tabular Disclosures The following tables disclose the fair value of derivative instruments in Trustmark’s consolidated balance sheets at June 30, 2021 and December 31, 2020 as well as the effect of these derivative instruments on Trustmark’s results of operations for the periods presented ($ in thousands): June 30, 2021 December 31, 2020 Derivatives not designated as hedging instruments Interest rate contracts: Exchange traded purchased options included in other assets $ 496 $ 145 OTC written options (rate locks) included in other assets 3,885 9,560 Futures contracts included in other assets 1,485 — Interest rate swaps included in other assets (1) 26,168 37,974 Credit risk participation agreements included in other assets 138 89 Futures contracts included in other liabilities — 34 Forward contracts included in other liabilities 587 3,145 Exchange traded written options included in other liabilities 233 632 Interest rate swaps included in other liabilities (1) 2,569 1,313 Credit risk participation agreements included in other liabilities 143 200 (1) In accordance with GAAP, the variation margin collateral payments made or received for interest rate swaps that are centrally cleared are legally characterized as settled. As a result, the centrally cleared interest rate swaps included in other assets and other liabilities are presented on a net basis in the accompanying consolidated balance sheets. Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Derivatives not designated as hedging instruments: Amount of gain (loss) recognized in mortgage banking, net $ (1,614 ) $ 12,395 $ (10,812 ) $ 45,881 Amount of gain (loss) recognized in bank card and other fees (667 ) (76 ) 935 (1,736 ) Trustmark’s interest rate swap derivative instruments are subject to master netting agreements, and therefore, eligible for offsetting in the consolidated balance sheets. Trustmark has elected to not offset any derivative instruments in its consolidated balance sheets. Information about financial instruments that are eligible for offset in the consolidated balance sheets as of June 30, 2021 and December 31, 2020 is presented in the following tables ($ in thousands): Offsetting of Derivative Assets As of June 30, 2021 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount Derivatives $ 26,168 $ — $ 26,168 $ (14 ) $ — $ 26,154 Offsetting of Derivative Liabilities As of June 30, 2021 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities presented in the Statement of Financial Position Financial Instruments Cash Collateral Posted Net Amount Derivatives $ 2,569 $ — $ 2,569 $ (14 ) $ (1,100 ) $ 1,455 Offsetting of Derivative Assets As of December 31, 2020 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount Derivatives $ 37,974 $ — $ 37,974 $ — $ — $ 37,974 Offsetting of Derivative Liabilities As of December 31, 2020 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities presented in the Statement of Financial Position Financial Instruments Cash Collateral Posted Net Amount Derivatives $ 1,313 $ — $ 1,313 $ — $ (1,313 ) $ —

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Segment Information	Note 18 – Segment Information Trustmark’s management reporting structure includes three segments: General Banking, Wealth Management and Insurance. For a complete overview of Trustmark’s operating segments, see Note 21 – Segment Information included in Part II. Item 8. – Financial Statements and Supplementary Data, of Trustmark’s 2020 Annual Report. The accounting policies of each reportable segment are the same as those of Trustmark except for its internal allocations. Noninterest expenses for back-office operations support are allocated to segments based on estimated uses of those services. Trustmark measures the net interest income of its business segments with a process that assigns cost of funds or earnings credit on a matched-term basis. This process, called “funds transfer pricing”, charges an appropriate cost of funds to assets held by a business unit, or credits the business unit for potential earnings for carrying liabilities. The net of these charges and credits flows through to the General Banking Segment, which contains the management team responsible for determining TNB’s funding and interest rate risk strategies. The following table discloses financial information by reportable segment for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 General Banking Net interest income $ 118,169 $ 103,376 $ 219,277 $ 205,779 Provision for credit losses (1) 540 24,430 (19,326 ) 49,587 Noninterest income 35,167 50,051 74,819 95,227 Noninterest expense (1) 102,199 97,113 206,163 196,780 Income before income taxes 50,597 31,884 107,259 54,639 Income taxes 7,137 4,093 15,260 6,184 General banking net income $ 43,460 $ 27,791 $ 91,999 $ 48,455 Selected Financial Information Total assets $ 16,716,574 $ 15,378,653 $ 16,716,574 $ 15,378,653 Depreciation and amortization $ 11,046 $ 10,422 $ 21,910 $ 19,216 Wealth Management Net interest income $ 1,256 $ 1,576 $ 2,487 $ 3,080 Provision for credit losses (3 ) (3 ) (5 ) 2,204 Noninterest income 9,020 7,550 17,483 16,066 Noninterest expense 7,749 6,944 15,943 15,460 Income before income taxes 2,530 2,185 4,032 1,482 Income taxes 633 547 1,009 371 Wealth management net income $ 1,897 $ 1,638 $ 3,023 $ 1,111 Selected Financial Information Total assets $ 299,275 $ 232,467 $ 299,275 $ 232,467 Depreciation and amortization $ 66 $ 67 $ 134 $ 134 Insurance Net interest income $ (2 ) $ 48 $ (5 ) $ 93 Noninterest income 12,224 11,910 24,692 23,482 Noninterest expense 8,731 8,360 18,121 17,204 Income before income taxes 3,491 3,598 6,566 6,371 Income taxes 867 877 1,645 1,569 Insurance net income $ 2,624 $ 2,721 $ 4,921 $ 4,802 Selected Financial Information Total assets $ 82,283 $ 80,959 $ 82,283 $ 80,959 Depreciation and amortization $ 190 $ 171 $ 384 $ 306 Consolidated Net interest income $ 119,423 $ 105,000 $ 221,759 $ 208,952 Provision for credit losses (1) 537 24,427 (19,331 ) 51,791 Noninterest income 56,411 69,511 116,994 134,775 Noninterest expense (1) 118,679 112,417 240,227 229,444 Income before income taxes 56,618 37,667 117,857 62,492 Income taxes 8,637 5,517 17,914 8,124 Consolidated net income $ 47,981 $ 32,150 $ 99,943 $ 54,368 Selected Financial Information Total assets $ 17,098,132 $ 15,692,079 $ 17,098,132 $ 15,692,079 Depreciation and amortization $ 11,302 $ 10,660 $ 22,428 $ 19,656 (1) During the second quarter of 2021, Trustmark reclassified its credit loss expense related to off-balance sheet credit exposures from noninterest expense to provision for credit losses, off-balance sheet credit exposures. Prior periods have been reclassified accordingly

Accounting Policies Recently Ad

Accounting Policies Recently Adopted and Pending Accounting Pronouncements	6 Months Ended
	Jun. 30, 2021
New Accounting Pronouncements And Changes In Accounting Principles [Abstract]
Accounting Policies Recently Adopted and Pending Accounting Pronouncements	Note 19 – Accounting Policies Recently Adopted and Pending Accounting Pronouncements Accounting Policies Recently Adopted Except for the changes detailed below, Trustmark has consistently applied its accounting policies to all periods presented in the accompanying consolidated financial statements. ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” Issued in December 2019, ASU 2019-12 seeks to simplify the accounting for income taxes by removing certain exceptions to the general principles in FASB ASC Topic 740. In particular, the amendments of ASU 2019-12 remove the exceptions to (1) the incremental approach for intra-period tax allocation when there is a loss from continuing operations and income or a gain from other items (e.g., discontinued operations or other comprehensive income); (2) the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment; (3) the ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary; and (4) the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. The amendments of ASU 2019-12 (1) require that an entity recognize a franchise tax (or similar tax), that is partially based on income, in accordance with FASB ASC Topic 740 and account for any incremental amount incurred as a non-income-based tax; (2) require that an entity evaluate when a step up in the tax basis of goodwill should be considered part of the business combination in which the book goodwill was originally recognized and when it should instead be considered a separate transaction; (3) specify that an entity is not required to allocate the consolidated amount of current and deferred tax expense to a legal entity that is not subject to tax in its separate financial statements, but rather may elect to do so for a legal entity that is both not subject to tax and disregarded by the taxing authority; and (4) require that an entity reflect the effect of an enacted change in tax laws or rates in the annual effective tax rate computation in the interim period that includes the enactment date. Trustmark adopted the amendments of ASU 2019-12 effective January 1, 2021. Adoption of ASU 2019-12 did not have a material impact to Trustmark’s consolidated financial statements. ASU 2018-14, “Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans.” Issued in August 2018, ASU 2018-14 modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in ASU 2018-14 remove certain disclosure requirements that are no longer considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. Trustmark adopted the amendments of ASU 2018-14 effective January 1, 2021. Trustmark will include the revised disclosures in its Annual Report on Form 10-K for the year ending December 31, 2021. Changes to the disclosures related to the defined benefit plans as a result of adopting ASU 2018-14 will not have a material impact to Trustmark’s consolidated financial statements Pending Accounting Pronouncements ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” Issued in March 2020, ASU 2020-04 seeks to provided additional guidance, for a limited time, to ease the potential burden in accounting for or recognizing the effects of reference rate reform on financial reporting. The FASB issued ASU 2020-04 is response to concerns about the structural risks of interbank offered rates (IBORs) and, in particular, the risk that the London Interbank Offer Rate (LIBOR) will no longer be used. Regulators have begun reference rate reform initiatives to identify alternative reference rates that are more observable or transaction-based and less susceptible to manipulation. Stakeholders have raised operational challenges likely to arise with the reference rate reform, particularly related to contract modifications and hedge accounting. The amendments of ASU 2020-04, which are elective and apply to all entities, provide expedients and exceptions for applying GAAP to contract modifications and hedging relationships affected by the reference rate reform if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference LIBOR or another reference rate that is expected to be discontinued due to reference rate reform. The optional expedients for contract modifications should be applied consistently for all contracts or transactions within the relevant Codification Topic or Subtopic or Industry Subtopic that contains the related guidance. The optional expedients for hedging relationships can be elected on an individual hedging relationship basis. As the guidance in ASU 2020-04 is intended to assist entities during the global market-wide reference rate transition period, it is in effect for a limited time, from March 12, 2020 through December 31, 2022. Management is currently evaluating the impact to Trustmark as a result of the potential discontinuance of LIBOR, and a determination cannot be made at this time as to the impact the amendments of ASU 2020-04 or the reference rate reform will have on its consolidated financial statements.

Accounting Policies Recently _2

Accounting Policies Recently Adopted and Pending Accounting Pronouncements (Policies)	6 Months Ended
	Jun. 30, 2021
Accounting Policies [Abstract]
Securities Available for Sale	Securities Available for Sale Quarterly, Trustmark evaluates if any security has a fair value less than its amortized cost. Once these securities are identified, in order to determine whether a decline in fair value resulted from a credit loss or other factors, Trustmark performs further analysis. If Trustmark determines that a credit loss exists, the credit portion of the allowance is measured using a discounted cash flow (DCF) analysis using the effective interest rate as of the security’s purchase date. The amount of credit loss Trustmark records will be limited to the amount by which the amortized cost exceeds the fair value. The DCF analysis utilizes contractual maturities, as well as third-party credit ratings and cumulative default rates published annually by Moody’s Investor Service (Moody’s). At both June 30, 2021 and December 31, 2020, the results of the analysis did not identify any securities that violate the credit loss triggers; therefore, no DCF analysis was performed and no credit loss was recognized on any of the securities available for sale. Accrued interest receivable is excluded from the estimate of credit losses for securities available for sale. At June 30, 2021, accrued interest receivable totaled $4.2 million for securities available for sale compared to $4.0 million at December 31, 2020 and was reported in other assets on the accompanying consolidated balance sheets.
Securities Held to Maturity	Securities Held to Maturity At June 30, 2021, the potential credit loss exposure was $13.0 million compared to $26.6 million at December 31, 2020 and consisted of municipal securities. After applying appropriate probability of default (PD) and loss given default (LGD) assumptions, the total amount of current expected credit losses was deemed immaterial. Therefore, no reserve was recorded at June 30, 2021 and December 31, 2020. Accrued interest receivable is excluded from the estimate of credit losses for securities held to maturity. At June 30, 2021 and accrued interest receivable totaled $888 thousand for securities held to maturity compared to $1.2 million at December 31, 2020 and was reported in other assets on the accompanying consolidated balance sheets. At both June 30, 2021 and December 31, 2020, Trustmark had no securities held to maturity that were past due 30 days or more as to principal or interest payments. Trustmark had no securities held to maturity classified as nonaccrual at June 30, 2021 and December 31, 2020.
Allowance for Credit Losses, LHFI (ACL)	ACL on LHFI Trustmark’s ACL methodology for LHFI is based upon guidance within the FASB ASC Subtopic 326-20 as well as applicable regulatory guidance. The ACL is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans. Credit quality within the LHFI portfolio is continuously monitored by Management and is reflected within the ACL for loans. The ACL is an estimate of expected losses inherent within Trustmark’s existing LHFI portfolio. The ACL for LHFI is adjusted through the PCL and reduced by the charge off of loan amounts, net of recoveries. The methodology for estimating the amount of expected credit losses reported in the ACL has two basic components: a collective, or pooled, component for estimated expected credit losses for pools of loans that share similar risk characteristics, and an asset-specific component involving individual loans that do not share risk characteristics with other loans and the measurement of expected credit losses for such individual loans. In estimating the allowance for credit losses for the collective component, loans are segregated into loan pools based on loan product types and similar risk characteristics. The loans secured by real estate and other loans secured by real estate portfolio segments include loans for both commercial and residential properties. The underwriting process for these loans includes analysis of the financial position and strength of both the borrower and guarantor, experience with similar projects in the past, market demand and prospects for successful completion of the proposed project within the established budget and schedule, values of underlying collateral, availability of permanent financing, maximum loan-to-value ratios, minimum equity requirements, acceptable amortization periods and minimum debt service coverage requirements, based on property type. The borrower’s financial strength and capacity to repay their obligations remain the primary focus of underwriting. Financial strength is evaluated based upon analytical tools that consider historical and projected cash flows and performance in addition to analysis of the proposed project for income-producing properties. Additional support offered by guarantors is also considered. Ultimate repayment of these loans is sensitive to interest rate changes, general economic conditions, liquidity and availability of long-term financing. The commercial and industrial LHFI portfolio segment includes loans within Trustmark’s geographic markets made to many types of businesses for various purposes, such as short term working capital loans that are usually secured by accounts receivable and inventory and term financing for equipment and fixed asset purchases that are secured by those assets. Trustmark’s credit underwriting process for commercial and industrial loans includes analysis of historical and projected cash flows and performance, evaluation of financial strength of both borrowers and guarantors as reflected in current and detailed financial information and evaluation of underlying collateral to support the credit. The consumer LHFI portfolio segment is comprised of loans which are underwritten after evaluating a borrower’s repayment capacity, credit and collateral. Several factors are considered when assessing a borrower’s capacity to repay the obligation, including the borrower’s employment, income, current debt and assets. Credit is assessed using a credit report that provides credit scores and the borrower’s current and past information about their credit history. Property appraisals are obtained to assist in evaluating collateral. Loan-to-value and debt-to-income ratios, loan amount and lien position are also considered in assessing whether to originate a loan. These borrowers are particularly susceptible to downturns in economic trends such as conditions that negatively affect housing prices and demand and levels of unemployment. The state and other political subdivision LHFI and the other commercial LHFI portfolio segments primarily consist of loans to non-depository financial institutions, such as mortgage companies, finance companies and other financial intermediaries, loans to state and political subdivisions, and loans to non-profit and charitable organizations. These loans are underwritten based on the specific nature or purpose of the loan and underlying collateral with special consideration given to the specific source of repayment for the loan. The following table provides a description of each of Trustmark’s portfolio segments, loan classes, loan pools and the ACL methodology and loss drivers: Portfolio Segment Loan Class Loan Pool Methodology Loss Drivers Loans secured by real estate Construction, land development and other land 1-4 family residential construction DCF Prime Rate, National GDP Lots and development DCF Prime Rate, Southern Unemployment Unimproved land DCF Prime Rate, Southern Unemployment All other consumer DCF Southern Unemployment Other secured by 1-4 family residential properties Consumer 1-4 family - 1st liens DCF Prime Rate, Southern Unemployment All other consumer DCF Southern Unemployment Nonresidential owner-occupied DCF Southern Unemployment, National GDP Secured by nonfarm, nonresidential properties Nonowner-occupied - hotel/motel DCF Southern Vacancy Rate, Southern Unemployment Nonowner-occupied - office DCF Southern Vacancy Rate, Southern Unemployment Nonowner-occupied- Retail DCF Southern Vacancy Rate, Southern Unemployment Nonowner-occupied - senior living/nursing homes DCF Southern Vacancy Rate, Southern Unemployment Nonowner-occupied - all other DCF Southern Vacancy Rate, Southern Unemployment Nonresidential owner-occupied DCF Southern Unemployment, National GDP Other real estate secured Nonresidential nonowner -occupied - apartments DCF Southern Vacancy Rate, Southern Unemployment Nonresidential owner-occupied DCF Southern Unemployment, National GDP Nonowner-occupied - all other DCF Southern Vacancy Rate, Southern Unemployment Other loans secured by real estate Other construction Other construction WARM Prime Rate, National Unemployment Secured by 1-4 family residential properties Trustmark mortgage WARM Southern Unemployment Commercial and industrial loans Commercial and industrial loans Commercial and industrial - non-working capital DCF Trustmark historical data Commercial and industrial - working capital DCF Trustmark historical data Credit cards WARM Trustmark call report data Consumer loans Consumer loans Credit cards WARM Trustmark call report data Overdrafts Loss Rate Trustmark historical data All other consumer DCF Southern Unemployment State and other political subdivision loans State and other political subdivision loans Obligations of state and political subdivisions DCF Moody's Bond Default Study Other commercial loans Other commercial loans Other loans DCF Prime Rate, Southern Unemployment Commercial and industrial - non-working capital DCF Trustmark historical data Commercial and industrial - working capital DCF Trustmark historical data In general, Trustmark utilizes a DCF method to estimate the quantitative portion of the allowance for credit losses for loan pools. The DCF model consists of two key components, a loss driver analysis (LDA) and a cash flow analysis. For loan pools utilizing the DCF methodology, multiple assumptions are in place, depending on the loan pool. A reasonable and supportable forecast is utilized for each loan pool by developing a LDA for each loan class. The LDA uses charge off data from Federal Financial Institutions Examination Council (FFIEC) reports to construct a periodic default rate (PDR). The PDR is decomposed into a PD. Regressions are run using the data for various macroeconomic variables in order to determine which ones correlate to Trustmark’s losses. These variables are then incorporated into the application to calculate a quarterly PD using a third-party baseline forecast. In addition to the PD, a LGD is derived using a method referred to as Frye Jacobs. The Frye Jacobs method is a mathematical formula that traces the relationship between LGD and PD over time and projects the LGD based on the levels of PD forecasts. This model approach is applicable to all pools within the construction, land development and other land, other secured by 1-4 family residential properties, secured by nonfarm, nonresidential properties and other real estate secured loan classes as well as the all other consumer and other loans pools. For the commercial and industrial loans related pools, Trustmark uses its own PD and LGD data, instead of the macroeconomic variables and the Frye Jacobs method described above, to calculate the PD and LGD as there were no defensible macroeconomic variables that correlated to Trustmark’s losses. Trustmark utilizes a third-party Bond Default Study to derive the PD and LGD for the obligations of state and political subdivisions pool. Due to the lack of losses within this pool, no defensible macroeconomic factors were identified to correlate. The PD and LGD measures are used in conjunction with prepayment data as inputs into the DCF model to calculate the cash flows at the individual loan level. Contractual cash flows based on loan terms are adjusted for PD, LGD and prepayments to derive loss cash flows. These loss cash flows are discounted by the loan’s coupon rate to arrive at the discounted cash flow based quantitative loss. The prepayment studies are updated quarterly by a third-party for each applicable pool. An alternate method of estimating the ACL is used for certain loan pools due to specific characteristics of these loans. For the non-DCF pools, specifically, those using the weighted average remaining maturity (WARM) method, the remaining life is incorporated into the ACL quantitative calculation. Trustmark determined that reasonable and supportable forecasts could be made for a twelve-month period for all of its loan pools. To the extent the lives of the loans in the LHFI portfolio extend beyond this forecast period, Trustmark uses a reversion period of four quarters and reverts to the historical mean on a straight-line basis over the remaining life of the loans. The econometric models currently in production reflect segment or pool level sensitivities of PD to changes in macroeconomic variables. By measuring the relationship between defaults and changes in the economy, the quantitative reserve incorporates reasonable and supportable forecasts of future conditions that will affect the value of its assets, as required by FASB ASC Topic 326. Under stable forecasts, these linear regressions will reasonably predict a pool’s PD. However, due to the COVID-19 pandemic, the macroeconomic variables used for reasonable and supportable forecasting have changed rapidly. At the current levels, it is not clear that the models currently in production will produce reasonably representative results since the models were originally estimated using data beginning in 2004 through 2019. During this period, a traditional, albeit severe, economic recession occurred. Thus, econometric models are sensitive to similar future levels of PD. In order to prevent the econometric models from extrapolating beyond reasonable boundaries of their input variables, Trustmark chose to establish an upper and lower limit process when applying the periodic forecasts. In this way, Management will not rely upon unobserved and untested relationships in the setting of the quantitative reserve. This approach applies to all input variables, including: Southern Unemployment, National Unemployment, National GDP, Southern Vacancy Rate and the Prime Rate. The upper and lower limits are based on the distribution of the macroeconomic variable by selecting extreme percentiles at the upper and lower limits of the distribution, the 1 st th However, due to multiple periods in the second quarter of 2021 having a PD or LGD at or near zero as a result of the improving macroeconomic forecasts, Management implemented PD and LGD floors to account for the risk associated with each portfolio. The PD and LGD floors are based on Trustmark’s historical loss experience and applied at a portfolio level. Qualitative factors used in the ACL methodology include the following: • Lending policies and procedures • Economic conditions and concentrations of credit • Nature and volume of the portfolio • Performance trends • External factors While all these factors are incorporated into the overall methodology, only three are currently considered active: (i) economic conditions and concentrations of credit, (ii) performance trends and (iii) external factors. Two of Trustmark’s largest loan classes are the loans secured by nonfarm, nonresidential properties and the loans secured by other real estate. Trustmark elected to create a qualitative factor specifically for these loan classes which addresses changes in the economic conditions of metropolitan areas and applies additional pool level reserves. This qualitative factor is based on third-party market data and forecast trends and is updated quarterly as information is available, by market and by loan pool. For the performance trends factor, Trustmark uses migration analyses to allocate additional ACL to non-pass/delinquent loans within each pool. In this way, Management believes the ACL will directly reflect changes in risk, based on the performance of the loans within a pool, whether declining or improving. The external factors qualitative factor is Management’s best judgement on the loan or pool level impact of all factors that affect the portfolio that are not accounted for using any other part of the ACL methodology (e.g., natural disasters, changes in legislation, impacts due to technology and pandemics). During the third quarter of 2020, Trustmark activated the External Factor – Pandemic to ensure reserve adequacy for collectively evaluated loans most likely to be impacted by the unique economic and behavioral conditions created by the COVID-19 pandemic. Additional qualitative reserves are derived based on two principles. The first is the disconnect of economic factors to Trustmark’s modeled probability of default (derived from the econometric models underpinning the quantitative pooled reserves). During the pandemic, extraordinary measures by the federal government were made available to consumers and businesses, including COVID-19 loan payment concessions, direct transfer payments to households, tax deferrals, and reduced interest rates, among others. These government interventions may have extended the lag between economic conditions and default, relative to what was captured in the model development data. Because Trustmark’s econometric PD models rely on the observed relationship from the economic downturn from 2007 to 2009 in both timing and severity, Management does not expect the models to reflect these current conditions. For example, while the models would predict contemporaneous unemployment peaks and loan defaults, this may not occur when borrowers can request payment deferrals. Thus, for the affected population, economic conditions are not fully considered as a part of Trustmark’s quantitative reserve. The second principle is the change in risk that is identified by rating changes. As a part of Trustmark’s credit review process, loans in the affected population have been given more frequent screening to ensure accurate ratings are maintained through this dynamic period. Trustmark’s quantitative reserve does not directly address changes in ratings, thus a migration qualitative factor was designed to work in concert with the quantitative reserve. In a downturn, the qualitative factor is inactive for most pools because changes in ratings are congruent with changes in macroeconomic conditions, which directly influence the PD models in the quantitative reserve. As discussed above, the disconnect of economic factors means that changes in rating caused by deteriorating and weak economic conditions as a result of the pandemic are not being captured in the quantitative reserve. During the fourth quarter of 2020, due to unforeseen pandemic conditions that varied from Management’s expectations during the third quarter of 2020, additional reserves were further dimensioned in order to appropriately reflect the risk within the portfolio related to the COVID-19 pandemic. In an effort to ensure the External Factor-Pandemic qualitative factor is reasonable and supportable, historical Trustmark loss data was leveraged to construct a framework that is quantitative in nature. To dimension the additional reserve, Management uses the sensitivity of the quantitative commercial loan reserve to changes in macroeconomic conditions to apply to loans rated acceptable or better (RR 1-4). In addition, to account for the known changes in risk, a weighted average of the commercial loan portfolio loss rate, derived from the performance trends qualitative factor, is used to dimension additional reserves for downgraded credits. Loans rated acceptable with risk (RR 5) or watch (RR 6) received the additional reserves based on the average of the macroeconomic conditions and weighted- average of the commercial loan portfolio loss rate while the loans rated special mention and substandard received additional reserves based on the weighted-average described above
Accounting Policies Recently Adopted and Pending Accounting Pronouncements	Accounting Policies Recently Adopted Except for the changes detailed below, Trustmark has consistently applied its accounting policies to all periods presented in the accompanying consolidated financial statements. ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” Issued in December 2019, ASU 2019-12 seeks to simplify the accounting for income taxes by removing certain exceptions to the general principles in FASB ASC Topic 740. In particular, the amendments of ASU 2019-12 remove the exceptions to (1) the incremental approach for intra-period tax allocation when there is a loss from continuing operations and income or a gain from other items (e.g., discontinued operations or other comprehensive income); (2) the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment; (3) the ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary; and (4) the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year. The amendments of ASU 2019-12 (1) require that an entity recognize a franchise tax (or similar tax), that is partially based on income, in accordance with FASB ASC Topic 740 and account for any incremental amount incurred as a non-income-based tax; (2) require that an entity evaluate when a step up in the tax basis of goodwill should be considered part of the business combination in which the book goodwill was originally recognized and when it should instead be considered a separate transaction; (3) specify that an entity is not required to allocate the consolidated amount of current and deferred tax expense to a legal entity that is not subject to tax in its separate financial statements, but rather may elect to do so for a legal entity that is both not subject to tax and disregarded by the taxing authority; and (4) require that an entity reflect the effect of an enacted change in tax laws or rates in the annual effective tax rate computation in the interim period that includes the enactment date. Trustmark adopted the amendments of ASU 2019-12 effective January 1, 2021. Adoption of ASU 2019-12 did not have a material impact to Trustmark’s consolidated financial statements. ASU 2018-14, “Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans.” Issued in August 2018, ASU 2018-14 modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans. The amendments in ASU 2018-14 remove certain disclosure requirements that are no longer considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant. Trustmark adopted the amendments of ASU 2018-14 effective January 1, 2021. Trustmark will include the revised disclosures in its Annual Report on Form 10-K for the year ending December 31, 2021. Changes to the disclosures related to the defined benefit plans as a result of adopting ASU 2018-14 will not have a material impact to Trustmark’s consolidated financial statements Pending Accounting Pronouncements ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.” Issued in March 2020, ASU 2020-04 seeks to provided additional guidance, for a limited time, to ease the potential burden in accounting for or recognizing the effects of reference rate reform on financial reporting. The FASB issued ASU 2020-04 is response to concerns about the structural risks of interbank offered rates (IBORs) and, in particular, the risk that the London Interbank Offer Rate (LIBOR) will no longer be used. Regulators have begun reference rate reform initiatives to identify alternative reference rates that are more observable or transaction-based and less susceptible to manipulation. Stakeholders have raised operational challenges likely to arise with the reference rate reform, particularly related to contract modifications and hedge accounting. The amendments of ASU 2020-04, which are elective and apply to all entities, provide expedients and exceptions for applying GAAP to contract modifications and hedging relationships affected by the reference rate reform if certain criteria are met. The amendments apply only to contracts and hedging relationships that reference LIBOR or another reference rate that is expected to be discontinued due to reference rate reform. The optional expedients for contract modifications should be applied consistently for all contracts or transactions within the relevant Codification Topic or Subtopic or Industry Subtopic that contains the related guidance. The optional expedients for hedging relationships can be elected on an individual hedging relationship basis. As the guidance in ASU 2020-04 is intended to assist entities during the global market-wide reference rate transition period, it is in effect for a limited time, from March 12, 2020 through December 31, 2022. Management is currently evaluating the impact to Trustmark as a result of the potential discontinuance of LIBOR, and a determination cannot be made at this time as to the impact the amendments of ASU 2020-04 or the reference rate reform will have on its consolidated financial statements.

Securities Available for Sale_2

Securities Available for Sale and Held to Maturity (Tables)	6 Months Ended
	Jun. 30, 2021
Investments Debt And Equity Securities [Abstract]
Amortized Cost and Estimated Fair Value of Available for Sale and Held to Maturity Securities	The following tables are a summary of the amortized cost and estimated fair value of securities available for sale and held to maturity at June 30, 2021 and December 31, 2020 ($ in thousands): Securities Available for Sale Securities Held to Maturity June 30, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value U.S. Treasury securities $ 29,988 $ 37 $ — $ 30,025 $ — $ — $ — $ — U.S. Government agency obligations 16,289 121 (387 ) 16,023 — — — — Obligations of states and political subdivisions 5,167 640 — 5,807 12,994 117 (5 ) 13,106 Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 47,365 1,091 (11 ) 48,445 6,249 289 — 6,538 Issued by FNMA and FHLMC 1,975,328 15,621 (7,166 ) 1,983,783 53,406 1,773 — 55,179 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 277,411 6,620 (43 ) 283,988 291,477 15,470 (38 ) 306,909 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 180,337 861 (530 ) 180,668 68,886 1,670 — 70,556 Total $ 2,531,885 $ 24,991 $ (8,137 ) $ 2,548,739 $ 433,012 $ 19,319 $ (43 ) $ 452,288 December 31, 2020 U.S. Government agency obligations $ 18,378 $ 144 $ (481 ) $ 18,041 $ — $ — $ — $ — Obligations of states and political subdivisions 5,198 637 — 5,835 26,584 258 (3 ) 26,839 Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 55,193 1,672 (3 ) 56,862 7,598 382 — 7,980 Issued by FNMA and FHLMC 1,421,861 20,768 (1,308 ) 1,441,321 67,944 2,397 — 70,341 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 409,883 9,600 (46 ) 419,437 360,361 19,678 (55 ) 379,984 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 49,260 1,068 (9 ) 50,319 75,585 2,386 — 77,971 Total $ 1,959,773 $ 33,889 $ (1,847 ) $ 1,991,815 $ 538,072 $ 25,101 $ (58 ) $ 563,115
Securities Held to Maturity by Credit Rating, as Determined by Moody's	The following table presents the amortized cost of Trustmark’s securities held to maturity by credit rating, as determined by Moody’s, at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 December 31, 2020 Aaa $ 420,018 $ 511,488 Aa1 to Aa3 8,944 22,528 Not Rated (1) 4,050 4,056 Total $ 433,012 $ 538,072 (1) Not rated securities primarily consist of Mississippi municipal general obligations.
Securities with Gross Unrealized Losses, Segregated by Length of Impairment	The tables below include securities with gross unrealized losses for which an allowance for credit losses has not been recorded and segregated by length of impairment at June 30, 2021 and December 31, 2020 ($ in thousands): Less than 12 Months 12 Months or More Total June 30, 2021 Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses Estimated Fair Value Gross Unrealized Losses U.S. Government agency obligations $ — $ — $ 10,003 $ (387 ) $ 10,003 $ (387 ) Obligations of states and political subdivisions 3,206 (3 ) 667 (2 ) 3,873 (5 ) Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 1,143 (11 ) — — 1,143 (11 ) Issued by FNMA and FHLMC 924,404 (7,166 ) — — 924,404 (7,166 ) Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 19,828 (81 ) — — 19,828 (81 ) Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 89,050 (521 ) 649 (9 ) 89,699 (530 ) Total $ 1,037,631 $ (7,782 ) $ 11,319 $ (398 ) $ 1,048,950 $ (8,180 ) December 31, 2020 U.S. Government agency obligations $ — $ — $ 11,167 $ (481 ) $ 11,167 $ (481 ) Obligations of states and political subdivisions — — 667 (3 ) 667 (3 ) Mortgage-backed securities Residential mortgage pass-through securities Guaranteed by GNMA 1,636 (3 ) — — 1,636 (3 ) Issued by FNMA and FHLMC 324,905 (1,308 ) — — 324,905 (1,308 ) Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 29,398 (101 ) — — 29,398 (101 ) Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA — — 659 (9 ) 659 (9 ) Total $ 355,939 $ (1,412 ) $ 12,493 $ (493 ) $ 368,432 $ (1,905 )
Contractual Maturities of Available for Sale and Held to Maturity Securities	The amortized cost and estimated fair value of securities available for sale and held to maturity at June 30, 2021, by contractual maturity, are shown below ($ in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities Available for Sale Securities Held to Maturity Amortized Cost Estimated Fair Value Amortized Cost Estimated Fair Value Due in one year or less $ 1,354 $ 1,376 $ 7,660 $ 7,687 Due after one year through five years 16,721 16,784 5,334 5,419 Due after five years through ten years 16,191 16,189 — — Due after ten years 17,178 17,506 — — 51,444 51,855 12,994 13,106 Mortgage-backed securities 2,480,441 2,496,884 420,018 439,182 Total $ 2,531,885 $ 2,548,739 $ 433,012 $ 452,288

Loans Held for Investment (LH_2

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (Tables)	6 Months Ended
	Jun. 30, 2021
Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]
Loan Portfolio Held for Investment	At June 30, 2021 and December 31, 2020, LHFI consisted of the following ($ in thousands): June 30, 2021 December 31, 2020 Loans secured by real estate: Construction, land development and other land $ 532,637 $ 514,056 Other secured by 1-4 family residential properties 507,733 524,732 Secured by nonfarm, nonresidential properties 2,819,662 2,709,026 Other real estate secured 1,078,622 1,065,964 Other loans secured by real estate: Other construction 827,665 794,983 Secured by 1-4 family residential properties 1,302,663 1,216,400 Commercial and industrial loans 1,326,605 1,309,078 Consumer loans 156,075 164,386 State and other political subdivision loans 1,136,764 1,000,776 Other commercial loans 464,443 525,123 LHFI 10,152,869 9,824,524 Less ACL 104,032 117,306 Net LHFI $ 10,048,837 $ 9,707,218
Schedule of Amortized Cost Basis of Loans on Nonaccrual Status	The following tables provide the amortized cost basis of loans on nonaccrual status and loans past due 90 days or more still accruing interest at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 Nonaccrual With No ACL Total Nonaccrual Loans Past Due 90 Days or More Still Accruing Loans secured by real estate: Construction, land development and other land $ 5,903 $ 6,165 $ — Other secured by 1-4 family residential properties 1,376 3,731 52 Secured by nonfarm, nonresidential properties 11,532 13,563 — Other real estate secured 57 175 — Other loans secured by real estate: Other construction — — — Secured by 1-4 family residential properties — 12,222 255 Commercial and industrial loans 3,078 6,042 — Consumer loans — 53 116 State and other political subdivision loans — 3,854 — Other commercial loans 77 5,643 — Total $ 22,023 $ 51,448 $ 423 December 31, 2020 Nonaccrual With No ACL Total Nonaccrual Loans Past Due 90 Days or More Still Accruing Loans secured by real estate: Construction, land development and other land $ 5,756 $ 5,985 $ — Other secured by 1-4 family residential properties 1,895 4,487 79 Secured by nonfarm, nonresidential properties 12,037 15,197 — Other real estate secured 60 185 — Other loans secured by real estate: Other construction — — — Secured by 1-4 family residential properties — 11,807 1,257 Commercial and industrial loans 12,665 15,618 — Consumer loans — 86 240 State and other political subdivision loans — 3,970 — Other commercial loans — 5,793 — Total $ 32,413 $ 63,128 $ 1,576
Aging Analysis of Past Due LHFI by Loan Type	The following tables provide an aging analysis of the amortized cost basis of past due LHFI at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 Past Due 30-59 Days 60-89 Days 90 Days or More Total Past Due Current Loans Total LHFI Loans secured by real estate: Construction, land development and other land $ 352 $ 5,583 $ 196 $ 6,131 $ 526,506 $ 532,637 Other secured by 1-4 family residential properties 1,160 538 803 2,501 505,232 507,733 Secured by nonfarm, nonresidential properties 422 23 693 1,138 2,818,524 2,819,662 Other real estate secured 63 — 107 170 1,078,452 1,078,622 Other loans secured by real estate: Other construction — — — — 827,665 827,665 Secured by 1-4 family residential properties 2,230 1,061 5,816 9,107 1,293,556 1,302,663 Commercial and industrial loans 291 65 3,797 4,153 1,322,452 1,326,605 Consumer loans 767 87 116 970 155,105 156,075 State and other political subdivision loans — — 177 177 1,136,587 1,136,764 Other commercial loans 400 73 5,086 5,559 458,884 464,443 Total $ 5,685 $ 7,430 $ 16,791 $ 29,906 $ 10,122,963 $ 10,152,869 December 31, 2020 Past Due 30-59 Days 60-89 Days 90 Days or Total Past Due Current Loans Total LHFI Loans secured by real estate: Construction, land development and other land $ 339 $ 34 $ 161 $ 534 $ 513,522 $ 514,056 Other secured by 1-4 family residential properties 1,505 523 896 2,924 521,808 524,732 Secured by nonfarm, nonresidential properties 920 — 972 1,892 2,707,134 2,709,026 Other real estate secured 103 101 107 311 1,065,653 1,065,964 Other loans secured by real estate: Other construction — — — — 794,983 794,983 Secured by 1-4 family residential properties 3,291 1,289 5,110 9,690 1,206,710 1,216,400 Commercial and industrial loans 271 196 1,543 2,010 1,307,068 1,309,078 Consumer loans 926 190 240 1,356 163,030 164,386 State and other political subdivision loans 117 — 177 294 1,000,482 1,000,776 Other commercial loans 2,143 2,971 346 5,460 519,663 525,123 Total $ 9,615 $ 5,304 $ 9,552 $ 24,471 $ 9,800,053 $ 9,824,524
Impact of Modifications Classified as Troubled Debt Restructurings	The following table illustrates the impact of modifications classified as TDRs for the periods presented ($ in thousands): Three Months Ended June 30, 2021 2020 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Loans secured by real estate: Construction, land development and other land 5 $ 5,582 $ 5,582 — $ — $ — Other secured by 1-4 family residential properties 3 37 37 3 206 210 Secured by nonfarm, nonresidential properties 1 377 377 1 139 139 Other loans secured by real estate: Secured by 1-4 family residential properties 1 123 123 — — — Commercial and industrial loans 1 1,000 1,000 — — — Consumer loans — — — 2 6 6 State and other political subdivision loans — — — 2 3,902 3,872 Other commercial loans 2 4,929 4,929 — — — Total 13 $ 12,048 $ 12,048 8 $ 4,253 $ 4,227 Six Months Ended June 30, 2021 2020 Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Number of Contracts Pre-Modification Outstanding Recorded Investment Post-Modification Outstanding Recorded Investment Loans secured by real estate: Construction, land development and other land 5 5,582 5,582 — $ — $ — Other secured by 1-4 family residential properties 3 37 37 8 707 711 Secured by nonfarm, nonresidential properties 1 377 377 1 139 139 Other loans secured by real estate: Secured by 1-4 family residential properties 3 249 249 — — — Commercial and industrial loans 2 1,014 1,014 2 1,582 1,582 Consumer loans — — — 6 26 26 State and other political subdivision loans — — — 2 3,902 3,872 Other commercial loans 2 4,929 4,929 — — — Total 16 $ 12,188 $ 12,188 19 $ 6,356 $ 6,330
Troubled Debt Restructuring Subsequently Defaulted	The table below includes the balances at default for TDRs modified within the last 12 months for which there was a payment default during the periods presented ($ in thousands): Six Months Ended June 30, 2021 2020 Number of Contracts Recorded Investment Number of Contracts Recorded Investment Loans secured by real estate: Other secured by 1-4 family residential properties — $ — 3 $ 420 Secured by nonfarm, nonresidential properties — — 1 139 Other loans secured by real estate: Secured by 1-4 family residential properties 1 78 — — Commercial and industrial loans — — 1 82 Other commercial loans 2 4,929 — — Total 3 $ 5,007 5 $ 641
Troubled Debt Restructuring Related to Loans Held for Investment by Loan Type	The following tables detail LHFI classified as TDRs by loan class at June 30, 2021 and 2020 ($ in thousands): June 30, 2021 Accruing Nonaccrual Total Loans secured by real estate: Construction, land development and other land $ — $ 5,593 $ 5,593 Other secured by 1-4 family residential properties — 1,160 1,160 Secured by nonfarm, nonresidential properties — 3,090 3,090 Other loans secured by real estate: Secured by 1-4 family residential properties 52 2,414 2,466 Commercial and industrial loans 2,500 1,608 4,108 Consumer loans — 12 12 State and other political subdivision loans — 3,677 3,677 Other commercial loans — 5,009 5,009 Total TDRs $ 2,552 $ 22,563 $ 25,115 June 30, 2020 Accruing Nonaccrual Total Loans secured by real estate: Construction, land development and other land $ — $ 14 $ 14 Other secured by 1-4 family residential properties 71 3,761 3,832 Secured by nonfarm, nonresidential properties — 3,010 3,010 Commercial and industrial loans 1,500 14,487 15,987 Consumer loans 18 21 39 State and other political subdivision loans — 3,872 3,872 Other commercial loans — 125 125 Total TDRs $ 1,589 $ 25,290 $ 26,879
Schedule Of Amortized Cost Basis Of Collateral-Dependent Loans	The following table presents the amortized cost basis of collateral-dependent loans by class of loans and collateral type as of June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 Real Estate Equipment and Machinery Inventory and Receivables Vehicles Miscellaneous Total Loans secured by real estate: Construction, land development and other land $ 5,903 $ — $ — $ — $ — $ 5,903 Other secured by 1-4 family residential properties — — — — — — Secured by nonfarm, nonresidential properties 11,763 — — — — 11,763 Other real estate secured 57 — — — — 57 Other loans secured by real estate: Other construction — — — — — — Secured by 1-4 family residential properties 1,376 — — — — 1,376 Commercial and industrial loans 43 72 4,285 74 — 4,474 Consumer loans — — — — — — State and other political subdivision loans 3,854 — — — — 3,854 Other commercial loans 365 — 2,031 4 3,051 5,451 Total $ 23,361 $ 72 $ 6,316 $ 78 $ 3,051 $ 32,878 December 31, 2020 Real Estate Equipment and Machinery Inventory and Receivables Vehicles Miscellaneous Total Loans secured by real estate: Construction, land development and other land $ 5,756 $ — $ — $ — $ — $ 5,756 Other secured by 1-4 family residential properties 454 — — — — 454 Secured by nonfarm, nonresidential properties 12,037 — — — — 12,037 Other real estate secured 60 — — — — 60 Other loans secured by real estate: Other construction — — — — — — Secured by 1-4 family residential properties 1,441 — — — — 1,441 Commercial and industrial loans 86 425 4,899 135 8,531 14,076 Consumer loans — — — — — — State and other political subdivision loans 3,970 — — — — 3,970 Other commercial loans 606 — 1,958 — 3,051 5,615 Total $ 24,410 $ 425 $ 6,857 $ 135 $ 11,582 $ 43,409
Carrying Amount of Loans by Credit Quality Indicator	The tables below present the amortized cost basis of loans by credit quality indicator and class of loans based on analyses performed at June 30, 2021 and December 31, 2020 ($ in thousands): Term Loans by Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Total As of June 30, 2021 Commercial LHFI Loans secured by real estate: Construction, land development and other land: Pass - RR 1 through RR 6 $ 188,112 $ 163,334 $ 36,863 $ 15,430 $ 1,880 $ 5,231 $ 33,860 $ 444,710 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 2,538 15 3,461 44 12 112 — 6,182 Doubtful - RR 9 — — — — — 42 — 42 Total 190,650 163,349 40,324 15,474 1,892 5,385 33,860 450,934 Other secured by 1-4 family residential properties: Pass - RR 1 through RR 6 $ 20,192 $ 28,659 $ 15,975 $ 12,834 $ 7,585 $ 8,108 $ 7,366 $ 100,719 Special Mention - RR 7 143 181 — 47 — — — 371 Substandard - RR 8 649 432 7 181 157 676 — 2,102 Doubtful - RR 9 — 25 — — — — — 25 Total 20,984 29,297 15,982 13,062 7,742 8,784 7,366 103,217 Secured by nonfarm, nonresidential properties: Pass - RR 1 through RR 6 $ 281,444 $ 635,065 $ 590,473 $ 445,938 $ 241,109 $ 404,951 $ 79,715 $ 2,678,695 Special Mention - RR 7 10,324 9,729 1,445 1,683 1,640 4,874 — 29,695 Substandard - RR 8 14,553 2,787 24,746 4,211 3,747 59,278 1,508 110,830 Doubtful - RR 9 48 — 150 — — 206 — 404 Total 306,369 647,581 616,814 451,832 246,496 469,309 81,223 2,819,624 Other real estate secured: Pass - RR 1 through RR 6 $ 139,687 $ 90,717 $ 451,580 $ 256,369 $ 33,260 $ 79,188 $ 12,611 $ 1,063,412 Special Mention - RR 7 — — — — — 808 — 808 Substandard - RR 8 3,836 9,999 — 12 — 179 — 14,026 Doubtful - RR 9 — — — — — — — — Total 143,523 100,716 451,580 256,381 33,260 80,175 12,611 1,078,246 Term Loans by Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Total As of June 30, 2021 Commercial LHFI Other loans secured by real estate: Other construction: Pass - RR 1 through RR 6 $ 178,219 $ 389,105 $ 231,297 $ 19,166 $ — $ — $ 8,505 $ 826,292 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 1,373 — — — — — — 1,373 Doubtful - RR 9 — — — — — — — — Total 179,592 389,105 231,297 19,166 — — 8,505 827,665 Commercial and industrial loans: Pass - RR 1 through RR 6 $ 277,330 $ 304,664 $ 140,848 $ 43,836 $ 57,941 $ 77,328 $ 367,148 $ 1,269,095 Special Mention - RR 7 1,032 385 212 715 97 — 678 3,119 Substandard - RR 8 6,640 6,032 1,799 1,472 3,589 3,251 31,294 54,077 Doubtful - RR 9 1 134 43 111 — 25 — 314 Total 285,003 311,215 142,902 46,134 61,627 80,604 399,120 1,326,605 State and other political subdivision loans: Pass - RR 1 through RR 6 $ 232,696 $ 193,403 $ 92,035 $ 36,643 $ 100,328 $ 466,386 $ 8,069 $ 1,129,560 Special Mention - RR 7 — — — — — 3,350 — 3,350 Substandard - RR 8 — — — — — 3,854 — 3,854 Doubtful - RR 9 — — — — — — — — Total 232,696 193,403 92,035 36,643 100,328 473,590 8,069 1,136,764 Other commercial loans: Pass - RR 1 through RR 6 $ 53,866 $ 53,529 $ 69,767 $ 15,147 $ 8,607 $ 62,018 $ 176,553 $ 439,487 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 — 7,235 2,113 415 — 316 14,804 24,883 Doubtful - RR 9 — 50 — — — 23 — 73 Total 53,866 60,814 71,880 15,562 8,607 62,357 191,357 464,443 Total commercial LHFI $ 1,412,683 $ 1,895,480 $ 1,662,814 $ 854,254 $ 459,952 $ 1,180,204 $ 742,111 $ 8,207,498 Term Loans by Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Total As of June 30, 2021 Consumer LHFI Loans secured by real estate: Construction, land development and other land: Current $ 17,103 $ 43,274 $ 11,951 $ 4,272 $ 1,092 $ 3,183 $ 451 $ 81,326 Past due 30-89 days — — 162 19 — 65 — 246 Past due 90 days or more — — — — — — — — Nonaccrual — — — — — 131 — 131 Total 17,103 43,274 12,113 4,291 1,092 3,379 451 81,703 Other secured by 1-4 family residential properties: Current $ 16,240 $ 13,834 $ 7,724 $ 7,426 $ 3,730 $ 10,239 $ 341,240 $ 400,433 Past due 30-89 days — 42 112 — — 88 548 790 Past due 90 days or more — — 32 — — — 21 53 Nonaccrual 14 61 15 11 412 371 2,356 3,240 Total 16,254 13,937 7,883 7,437 4,142 10,698 344,165 404,516 Secured by nonfarm, nonresidential properties: Current $ 35 $ — $ — $ — $ 3 $ — $ — $ 38 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total 35 — — — 3 — — 38 Other real estate secured: Current $ — $ 102 $ — $ 9 $ 34 $ 231 $ — $ 376 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — 102 — 9 34 231 — 376 Term Loans by Origination Year 2021 2020 2019 2018 2017 Prior Revolving Loans Total As of June 30, 2021 Consumer LHFI Other loans secured by real estate: Secured by 1-4 family residential properties Current $ 308,154 $ 258,410 $ 167,332 $ 133,808 $ 73,300 $ 346,774 $ — $ 1,287,778 Past due 30-89 days — 701 186 174 121 1,229 — 2,411 Past due 90 days or more — 253 — — — 2 — 255 Nonaccrual — 1,203 896 2,110 861 7,149 — 12,219 Total 308,154 260,567 168,414 136,092 74,282 355,154 — 1,302,663 Consumer loans: Current $ 37,466 $ 40,869 $ 15,320 $ 8,082 $ 2,317 $ 907 $ 50,097 $ 155,058 Past due 30-89 days 327 163 52 25 1 1 279 848 Past due 90 days or more 20 — 12 — — — 84 116 Nonaccrual — 5 3 20 10 1 14 53 Total 37,813 41,037 15,387 8,127 2,328 909 50,474 156,075 Total consumer LHFI $ 379,359 $ 358,917 $ 203,797 $ 155,956 $ 81,881 $ 370,371 $ 395,090 $ 1,945,371 Total LHFI $ 1,792,042 $ 2,254,397 $ 1,866,611 $ 1,010,210 $ 541,833 $ 1,550,575 $ 1,137,201 $ 10,152,869 Term Loans by Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Total As of December 31, 2020 Commercial LHFI Loans secured by real estate: Construction, land development and other land: Pass - RR 1 through RR 6 $ 287,218 $ 62,078 $ 26,401 $ 4,487 $ 3,274 $ 3,564 $ 28,548 $ 415,570 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 5,419 4,363 1,226 12 494 22 101 11,637 Doubtful - RR 9 — — — — — 42 — 42 Total 292,637 66,441 27,627 4,499 3,768 3,628 28,649 427,249 Other secured by 1-4 family residential properties: Pass - RR 1 through RR 6 $ 35,139 $ 19,596 $ 15,399 $ 9,605 $ 10,273 $ 4,786 $ 8,486 $ 103,284 Special Mention - RR 7 255 — 50 — — — — 305 Substandard - RR 8 1,155 8 914 341 302 337 3,950 7,007 Doubtful - RR 9 29 — — — — — — 29 Total 36,578 19,604 16,363 9,946 10,575 5,123 12,436 110,625 Secured by nonfarm, nonresidential properties: Pass - RR 1 through RR 6 $ 697,439 $ 496,476 $ 442,264 $ 293,072 $ 254,747 $ 251,219 $ 96,098 $ 2,531,315 Special Mention - RR 7 13,452 6,139 2,956 4,466 4,957 20,545 — 52,515 Substandard - RR 8 19,119 20,572 4,516 12,956 38,956 25,438 2,779 124,336 Doubtful - RR 9 52 163 — — 217 306 — 738 Total 730,062 523,350 449,736 310,494 298,877 297,508 98,877 2,708,904 Other real estate secured: Pass - RR 1 through RR 6 $ 146,803 $ 376,765 $ 347,472 $ 48,626 $ 89,824 $ 23,680 $ 12,116 $ 1,045,286 Special Mention - RR 7 — — — — — 841 — 841 Substandard - RR 8 18,649 14 18 — 556 122 — 19,359 Doubtful - RR 9 — — — — — — — — Total 165,452 376,779 347,490 48,626 90,380 24,643 12,116 1,065,486 Term Loans by Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Total As of December 31, 2020 Commercial LHFI Other loans secured by real estate: Other construction Pass - RR 1 through RR 6 $ 262,544 $ 425,936 $ 81,476 $ 14,074 $ 2,464 $ — $ 7,735 $ 794,229 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 754 — — — — — — 754 Doubtful - RR 9 — — — — — — — — Total 263,298 425,936 81,476 14,074 2,464 — 7,735 794,983 Commercial and industrial loans: Pass - RR 1 through RR 6 $ 444,304 $ 165,163 $ 77,611 $ 77,985 $ 59,131 $ 43,214 $ 372,486 $ 1,239,894 Special Mention - RR 7 677 45 — — — — 240 962 Substandard - RR 8 12,090 1,814 9,737 3,735 2,160 5,024 33,380 67,940 Doubtful - RR 9 151 95 — — 32 4 — 282 Total 457,222 167,117 87,348 81,720 61,323 48,242 406,106 1,309,078 State and other political subdivision loans: Pass - RR 1 through RR 6 $ 250,363 $ 79,595 $ 41,334 $ 113,817 $ 132,634 $ 372,831 $ 1,446 $ 992,020 Special Mention - RR 7 — — — — — 4,018 — 4,018 Substandard - RR 8 — — — 247 — 4,491 — 4,738 Doubtful - RR 9 — — — — — — — — Total 250,363 79,595 41,334 114,064 132,634 381,340 1,446 1,000,776 Other commercial loans: Pass - RR 1 through RR 6 $ 101,230 $ 70,990 $ 20,769 $ 9,723 $ 33,481 $ 30,715 $ 225,533 $ 492,441 Special Mention - RR 7 7,500 — — — — — 11,333 18,833 Substandard - RR 8 381 2,099 683 6 707 — 9,948 13,824 Doubtful - RR 9 2 — — — — 23 — 25 Total 109,113 73,089 21,452 9,729 34,188 30,738 246,814 525,123 Total commercial LHFI $ 2,304,725 $ 1,731,911 $ 1,072,826 $ 593,152 $ 634,209 $ 791,222 $ 814,179 $ 7,942,224 Term Loans by Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Total As of December 31, 2020 Consumer LHFI Loans secured by real estate: Construction, land development and other land: Current $ 47,336 $ 24,174 $ 8,496 $ 2,036 $ 1,447 $ 2,868 $ — $ 86,357 Past due 30-89 days — 318 20 — 1 12 — 351 Past due 90 days or more — — — — — — — — Nonaccrual — — — — — 99 — 99 Total 47,336 24,492 8,516 2,036 1,448 2,979 — 86,807 Other secured by 1-4 family residential properties: Current $ 20,864 $ 10,253 $ 12,037 $ 4,177 $ 2,082 $ 11,124 $ 348,830 $ 409,367 Past due 30-89 days 93 12 — 13 — 133 1,058 1,309 Past due 90 days or more — — — — — 30 22 52 Nonaccrual 6 44 121 428 — 382 2,398 3,379 Total 20,963 10,309 12,158 4,618 2,082 11,669 352,308 414,107 Secured by nonfarm, nonresidential properties: Current $ 109 $ — $ — $ 4 $ — $ 9 $ — $ 122 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total 109 — — 4 — 9 — 122 Other real estate secured: Current $ 107 $ — $ 38 $ 37 $ 96 $ 200 $ — $ 478 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total 107 — 38 37 96 200 — 478 Term Loans by Origination Year 2020 2019 2018 2017 2016 Prior Revolving Loans Total As of December 31, 2020 Consumer LHFI Other loans secured by real estate: Secured by 1-4 family residential properties Current $ 289,521 $ 214,056 $ 173,324 $ 92,564 $ 109,031 $ 321,250 $ — $ 1,199,746 Past due 30-89 days 499 93 753 366 1,080 799 — 3,590 Past due 90 days or more 159 214 208 127 — 549 — 1,257 Nonaccrual 283 711 2,024 682 239 7,868 — 11,807 Total 290,462 215,074 176,309 93,739 110,350 330,466 — 1,216,400 Consumer loans: Current $ 65,370 $ 25,303 $ 13,140 $ 3,893 $ 1,257 $ 345 $ 53,669 $ 162,977 Past due 30-89 days 524 158 67 19 7 3 305 1,083 Past due 90 days or more 77 — 4 — — — 159 240 Nonaccrual 12 4 55 13 2 — — 86 Total 65,983 25,465 13,266 3,925 1,266 348 54,133 164,386 Total consumer LHFI $ 424,960 $ 275,340 $ 210,287 $ 104,359 $ 115,242 $ 345,671 $ 406,441 $ 1,882,300 Total LHFI $ 2,729,685 $ 2,007,251 $ 1,283,113 $ 697,511 $ 749,451 $ 1,136,893 $ 1,220,620 $ 9,824,524
Summary of Trustmark's Portfolio Segments, Loan Classes, Loan Pools and the ACL Methodology and Loss Drivers	The following table provides a description of each of Trustmark’s portfolio segments, loan classes, loan pools and the ACL methodology and loss drivers: Portfolio Segment Loan Class Loan Pool Methodology Loss Drivers Loans secured by real estate Construction, land development and other land 1-4 family residential construction DCF Prime Rate, National GDP Lots and development DCF Prime Rate, Southern Unemployment Unimproved land DCF Prime Rate, Southern Unemployment All other consumer DCF Southern Unemployment Other secured by 1-4 family residential properties Consumer 1-4 family - 1st liens DCF Prime Rate, Southern Unemployment All other consumer DCF Southern Unemployment Nonresidential owner-occupied DCF Southern Unemployment, National GDP Secured by nonfarm, nonresidential properties Nonowner-occupied - hotel/motel DCF Southern Vacancy Rate, Southern Unemployment Nonowner-occupied - office DCF Southern Vacancy Rate, Southern Unemployment Nonowner-occupied- Retail DCF Southern Vacancy Rate, Southern Unemployment Nonowner-occupied - senior living/nursing homes DCF Southern Vacancy Rate, Southern Unemployment Nonowner-occupied - all other DCF Southern Vacancy Rate, Southern Unemployment Nonresidential owner-occupied DCF Southern Unemployment, National GDP Other real estate secured Nonresidential nonowner -occupied - apartments DCF Southern Vacancy Rate, Southern Unemployment Nonresidential owner-occupied DCF Southern Unemployment, National GDP Nonowner-occupied - all other DCF Southern Vacancy Rate, Southern Unemployment Other loans secured by real estate Other construction Other construction WARM Prime Rate, National Unemployment Secured by 1-4 family residential properties Trustmark mortgage WARM Southern Unemployment Commercial and industrial loans Commercial and industrial loans Commercial and industrial - non-working capital DCF Trustmark historical data Commercial and industrial - working capital DCF Trustmark historical data Credit cards WARM Trustmark call report data Consumer loans Consumer loans Credit cards WARM Trustmark call report data Overdrafts Loss Rate Trustmark historical data All other consumer DCF Southern Unemployment State and other political subdivision loans State and other political subdivision loans Obligations of state and political subdivisions DCF Moody's Bond Default Study Other commercial loans Other commercial loans Other loans DCF Prime Rate, Southern Unemployment Commercial and industrial - non-working capital DCF Trustmark historical data Commercial and industrial - working capital DCF Trustmark historical data
Change in Allowance for Loan Losses	The following tables disaggregate the ACL and the amortized cost basis of the loans by the measurement methodology used at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 ACL LHFI Individually Evaluated for Credit Loss Collectively Evaluated for Credit Loss Total ACL Individually Evaluated for Credit Loss Collectively Evaluated for Credit Loss Total LHFI Loans secured by real estate: Construction, land development and other land $ — $ 5,110 $ 5,110 $ 5,903 526,734 $ 532,637 Other secured by 1-4 family residential properties — 10,399 10,399 — 507,733 507,733 Secured by nonfarm, nonresidential properties — 44,416 44,416 11,763 2,807,899 2,819,662 Other real estate secured — 5,311 5,311 57 1,078,565 1,078,622 Other loans secured by real estate: Other construction — 6,530 6,530 — 827,665 827,665 Secured by 1-4 family residential properties — 2,910 2,910 1,376 1,301,287 1,302,663 Commercial and industrial loans 577 13,396 13,973 4,474 1,322,131 1,326,605 Consumer loans — 4,876 4,876 — 156,075 156,075 State and other political subdivision loans 1,584 1,649 3,233 3,854 1,132,910 1,136,764 Other commercial loans 2,088 5,186 7,274 5,451 458,992 464,443 Total $ 4,249 $ 99,783 $ 104,032 $ 32,878 $ 10,119,991 $ 10,152,869 December 31, 2020 ACL LHFI Individually Evaluated Collectively Evaluated Total Individually Evaluated Collectively Evaluated Total Loans secured by real estate: Construction, land development and other land $ — $ 6,854 $ 6,854 $ 5,756 $ 508,300 $ 514,056 Other secured by 1-4 family residential properties — 9,928 9,928 454 524,278 524,732 Secured by nonfarm, nonresidential properties — 48,523 48,523 12,037 2,696,989 2,709,026 Other real estate secured — 7,382 7,382 60 1,065,904 1,065,964 Other loans secured by real estate: Other construction — 8,158 8,158 — 794,983 794,983 Secured by 1-4 family residential properties — 5,143 5,143 1,441 1,214,959 1,216,400 Commercial and industrial loans 579 14,272 14,851 14,076 1,295,002 1,309,078 Consumer loans — 5,838 5,838 — 164,386 164,386 State and other political subdivision loans 1,700 1,490 3,190 3,970 996,806 1,000,776 Other commercial loans 2,100 5,339 7,439 5,615 519,508 525,123 Total $ 4,379 $ 112,927 $ 117,306 $ 43,409 $ 9,781,115 $ 9,824,524 Changes in the ACL were as follows for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Balance at beginning of period $ 109,191 $ 100,564 $ 117,306 $ 84,277 FASB ASU 2016-13 adoption adjustments: LHFI — — — (3,039 ) Allowance for loan losses, acquired loans transfer — — — 815 Acquired loans ACL adjustment — — — 1,007 Loans charged-off (4,828 ) (1,870 ) (6,073 ) (7,415 ) Recoveries 3,660 2,309 7,291 4,777 Net (charge-offs) recoveries (1,168 ) 439 1,218 (2,638 ) PCL (3,991 ) 18,185 (14,492 ) 38,766 Balance at end of period $ 104,032 $ 119,188 $ 104,032 $ 119,188 The following tables detail changes in the ACL by loan class for the periods presented ($ in thousands): Three Months Ended June 30, 2021 Balance at Beginning of Period Charge-offs Recoveries PCL Balance at End of Period Loans secured by real estate: Construction, land development and other land $ 5,058 $ — $ 313 $ (261 ) $ 5,110 Other secured by 1-4 family residential properties 8,667 (58 ) 181 1,609 10,399 Secured by nonfarm, nonresidential properties 46,438 (79 ) 1,027 (2,970 ) 44,416 Other real estate secured 5,770 — 5 (464 ) 5,311 Other loans secured by real estate: Other construction 5,124 — 43 1,363 6,530 Secured by 1-4 family residential properties 3,753 (4 ) 8 (847 ) 2,910 Commercial and industrial loans 20,166 (3,674 ) 652 (3,171 ) 13,973 Consumer loans 4,750 (391 ) 387 130 4,876 State and other political subdivision loans 3,015 — — 218 3,233 Other commercial loans 6,450 (622 ) 1,044 402 7,274 Total $ 109,191 $ (4,828 ) $ 3,660 $ (3,991 ) $ 104,032 The decreases in the PCL for the three months ended June 30, 2021 were primarily due to improvements in the macroeconomic forecasting variables used in the ACL modeling, such as National and Southern Unemployment, National GDP, Prime Rate and South Vacancy Rate and the implementation of the PD and LGD floors. The PCL for the other construction portfolio and other secured by 1-4 family residential properties increased $1.4 million and $1.6 million, respectively, during the three months ended June 30, 2021 primarily due to the implementation of the PD and LGD floors using Trustmark’s historical experience. Three Months Ended June 30, 2020 Balance at Beginning of Period Charge-offs Recoveries PCL Balance at End of Period Loans secured by real estate: Construction, land development and other land $ 9,079 $ (7 ) $ 92 $ 2,776 $ 11,940 Other secured by 1-4 family residential properties 11,711 (36 ) 83 958 12,716 Secured by nonfarm, nonresidential properties 28,127 — 445 7,845 36,417 Other real estate secured 5,273 — 12 2,315 7,600 Other loans secured by real estate: Other construction 7,711 — 21 3,071 10,803 Secured by 1-4 family residential properties 8,042 — 13 2,844 10,899 Commercial and industrial loans 14,564 (297 ) 191 (1,908 ) 12,550 Consumer loans 6,596 (671 ) 468 4 6,397 State and other political subdivision loans 3,441 — — (27 ) 3,414 Other commercial loans 6,020 (859 ) 984 307 6,452 Total $ 100,564 $ (1,870 ) $ 2,309 $ 18,185 $ 119,188 The increases in the PCL for loans and other loans secured by real estate during the three months ended June 30, 2020 were primarily due to the negative impact of COVID-19 on the macroeconomic forecasting variables used in the ACL modeling, such as National and Southern Unemployment, National GDP, Prime Rate and Southern Vacancy Rate. The PCL for the commercial and industrial loan portfolio decreased an $1.9 million during the three months ended June 30, 2020 primarily due to upgrades of loans from substandard to pass, paydowns and a slight decrease in the calculated PD and LGD, which uses Trustmark’s historical data. Six Months Ended June 30, 2021 Balance at Beginning of Period Charge-offs Recoveries PCL Balance at End of Period Loans secured by real estate: Construction, land development and other land $ 6,854 $ — $ 1,079 $ (2,823 ) $ 5,110 Other secured by 1-4 family residential properties 9,928 (84 ) 252 303 10,399 Secured by nonfarm, nonresidential properties 48,523 (79 ) 1,057 (5,085 ) 44,416 Other real estate secured 7,382 — 11 (2,082 ) 5,311 Other loans secured by real estate: Other construction 8,158 — 44 (1,672 ) 6,530 Secured by 1-4 family residential properties 5,143 (4 ) 108 (2,337 ) 2,910 Commercial and industrial loans 14,851 (3,697 ) 1,939 880 13,973 Consumer loans 5,838 (833 ) 749 (878 ) 4,876 State and other political subdivision loans 3,190 — — 43 3,233 Other commercial loans 7,439 (1,376 ) 2,052 (841 ) 7,274 Total $ 117,306 $ (6,073 ) $ 7,291 $ (14,492 ) $ 104,032 Decreases in the PCL for the first six months of 2021 were primarily due to improvements in the macroeconomic forecasting variables used in the ACL modeling, such as National and Southern Unemployment, National GDP, Prime Rate and Southern Vacancy Rate. Six Months Ended June 30, 2020 Balance at Beginning of Period FASB ASU 2016-13 Adoption Adjustment Charge-offs Recoveries PCL Balance at End of Period Loans secured by real estate: Construction, land development and other land $ 6,371 $ (188 ) $ (7 ) $ 186 $ 5,578 $ 11,940 Other secured by 1-4 family residential properties 5,888 4,188 (100 ) 146 2,594 12,716 Secured by nonfarm, nonresidential properties 26,158 (8,179 ) (2,448 ) 506 20,380 36,417 Other real estate secured 4,024 (765 ) (8 ) 18 4,331 7,600 Other loans secured by real estate: Other construction 1,889 3,202 — 40 5,672 10,803 Secured by 1-4 family residential properties 3,044 2,891 (19 ) 106 4,877 10,899 Commercial and industrial loans 25,992 (8,964 ) (1,279 ) 733 (3,932 ) 12,550 Consumer loans 3,379 2,059 (1,361 ) 941 1,379 6,397 State and other political subdivision loans 2,229 2,455 — — (1,270 ) 3,414 Other commercial loans 5,303 2,084 (2,193 ) 2,101 (843 ) 6,452 Total $ 84,277 $ (1,217 ) $ (7,415 ) $ 4,777 $ 38,766 $ 119,188

Mortgage Banking (Tables)

Mortgage Banking (Tables)	6 Months Ended
	Jun. 30, 2021
Mortgage Banking [Abstract]
Schedule of Activity in the Mortgage Servicing Rights	The activity in the mortgage servicing rights (MSR) is detailed in the table below for the periods presented ($ in thousands): Six Months Ended June 30, 2021 2020 Balance at beginning of period $ 66,464 $ 79,394 Origination of servicing assets 15,201 12,396 Change in fair value: Due to market changes 9,231 (27,158 ) Due to run-off (10,132 ) (6,821 ) Balance at end of period $ 80,764 $ 57,811
Schedule of Mortgage Loans Sold and Serviced for Others	The table below details the mortgage loans sold and serviced for others at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 December 31, 2020 Federal National Mortgage Association $ 4,718,042 $ 4,629,670 Government National Mortgage Association 3,077,238 2,960,760 Federal Home Loan Mortgage Corporation 43,040 50,459 Other 14,773 16,201 Total mortgage loans sold and serviced for others $ 7,853,093 $ 7,657,090

Other Real Estate (Tables)

Other Real Estate (Tables)	6 Months Ended
	Jun. 30, 2021
Other Real Estate And Foreclosed Assets [Abstract]
Changes and Gains (Losses), Net on Other Real Estate	For the periods presented, changes and gains (losses), net on other real estate were as follows ($ in thousands): Six Months Ended June 30, 2021 2020 Balance at beginning of period $ 11,651 $ 29,248 Additions 382 406 Disposals (1,149 ) (10,534 ) Write-downs (1,445 ) (844 ) Balance at end of period $ 9,439 $ 18,276 Gains (losses), net on the sale of other real estate included in other real estate expense $ 18 $ (255 )
Other Real Estate, By Type of Property	At June 30, 2021 and December 31, 2020, other real estate by type of property consisted of the following ($ in thousands): June 30, 2021 December 31, 2020 Construction, land development and other land properties $ 3,249 $ 3,857 1-4 family residential properties 1,204 1,349 Nonfarm, nonresidential properties 4,986 6,445 Total other real estate $ 9,439 $ 11,651
Other Real Estate, By Geographic Location	At June 30, 2021 and December 31, 2020, other real estate by geographic location consisted of the following ($ in thousands): June 30, 2021 December 31, 2020 Alabama $ 2,830 $ 3,271 Mississippi (1) 6,550 8,330 Tennessee (2) 59 50 Total other real estate $ 9,439 $ 11,651 (1) Mississippi includes Central and Southern Mississippi Regions. (2) Tennessee includes Memphis, Tennessee and Northern Mississippi Regions.

Leases (Tables)

Leases (Tables)	6 Months Ended
	Jun. 30, 2021
Leases [Abstract]
Components of Net Lease Cost	The following table details the components of net lease cost for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Finance leases: Amortization of right-of-use assets $ 387 $ 481 $ 771 $ 978 Interest on lease liabilities 56 65 113 132 Operating lease cost 1,342 1,289 2,647 2,579 Short-term lease cost 110 111 229 220 Variable lease cost 311 332 618 679 Sublease income (77 ) (63 ) (153 ) (162 ) Net lease cost $ 2,129 $ 2,215 $ 4,225 $ 4,426
Cash Payments Included in Measurement of Lease Liabilities	The following table details the cash payments included in the measurement of lease liabilities during the periods presented ($ in thousands): Six Months Ended June 30, 2021 2020 Finance leases: Operating cash flows included in operating activities $ 113 $ 132 Financing cash flows included in payments under finance lease obligations 712 905 Operating leases: Operating cash flows (fixed payments) included in other operating activities, net 2,267 2,493 Operating cash flows (liability reduction) included in other operating activities, net 1,954 1,949
Balance Sheet Information and Weighted-Average Lease Terms and Discount Rates Related to Leases	The following table details balance sheet information, as well as weighted-average lease terms and discount rates, related to leases at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 December 31, 2020 Finance lease right-of-use assets, net of accumulated depreciation $ 6,792 $ 7,471 Finance lease liabilities 7,185 7,805 Operating lease right-of-use assets 33,201 30,901 Operating lease liabilities 34,959 32,290 Weighted-average lease term: Finance leases 8.37 years 8.53 years Operating leases 9.06 years 8.65 years Weighted-average discount rate: Finance leases 3.15 % 3.10 % Operating leases 3.16 % 3.41 %
Future Minimum Rental Commitments Under Finance and Operating Leases	At June 30, 2021, future minimum rental commitments under finance and operating leases were as follows ($ in thousands): Finance Leases Operating Leases 2021 (excluding the six months ended June 30, 2021) $ 828 $ 2,525 2022 1,597 4,864 2023 885 4,670 2024 572 4,713 2025 584 4,752 Thereafter 3,868 18,743 Total minimum lease payments 8,334 40,267 Less imputed interest (1,149 ) (5,308 ) Lease liabilities $ 7,185 $ 34,959

Deposits (Tables)

Deposits (Tables)	6 Months Ended
	Jun. 30, 2021
Deposits [Abstract]
Deposits Summary	At June 30, 2021 and December 31, 2020, deposits consisted of the following ($ in thousands): June 30, 2021 December 31, 2020 Noninterest-bearing demand $ 4,446,991 $ 4,349,010 Interest-bearing demand 4,208,521 3,646,246 Savings 4,694,346 4,647,610 Time 1,282,226 1,405,898 Total $ 14,632,084 $ 14,048,764

Securities Sold Under Repurch_2

Securities Sold Under Repurchase Agreements (Tables)	6 Months Ended
	Jun. 30, 2021
Securities Sold Under Agreements To Repurchase [Abstract]
Schedule of Securities Sold Under Repurchase Agreements	The following table presents the securities sold under repurchase agreements by collateral pledged at June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 December 31, 2020 Mortgage-backed securities Residential mortgage pass-through securities Issued by FNMA and FHLMC $ 109,707 $ 115,357 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 921 12,696 Total securities sold under repurchase agreements $ 110,628 $ 128,053

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2021
Revenue From Contract With Customer [Abstract]
Summary of Noninterest Income Disaggregated by Reportable Operating Segment and Revenue Stream	The following table presents noninterest income disaggregated by reportable operating segment and revenue stream for the periods presented ($ in thousands): Three Months Ended June 30, 2021 Three Months Ended June 30, 2020 Topic 606 Not Topic 606 (1) Total Topic 606 Not Topic 606 (1) Total General Banking Segment Service charges on deposit accounts $ 7,591 $ — $ 7,591 $ 6,380 $ — $ 6,380 Bank card and other fees 8,519 (228 ) 8,291 6,549 1,160 7,709 Mortgage banking, net — 17,333 17,333 — 33,745 33,745 Wealth management 2 — 2 79 — 79 Other, net 1,699 251 1,950 1,354 784 2,138 Total noninterest income $ 17,811 $ 17,356 $ 35,167 $ 14,362 $ 35,689 $ 50,051 Wealth Management Segment Service charges on deposit accounts $ 22 $ — $ 22 $ 17 $ — $ 17 Bank card and other fees 10 — 10 8 — 8 Wealth management 8,944 — 8,944 7,492 — 7,492 Other, net 35 9 44 24 9 33 Total noninterest income $ 9,011 $ 9 $ 9,020 $ 7,541 $ 9 $ 7,550 Insurance Segment Insurance commissions $ 12,217 $ — $ 12,217 $ 11,868 $ — $ 11,868 Other, net 7 — 7 42 — 42 Total noninterest income $ 12,224 $ — $ 12,224 $ 11,910 $ — $ 11,910 Consolidated Service charges on deposit accounts $ 7,613 $ — $ 7,613 $ 6,397 $ — $ 6,397 Bank card and other fees 8,529 (228 ) 8,301 6,557 1,160 7,717 Mortgage banking, net — 17,333 17,333 — 33,745 33,745 Insurance commissions 12,217 — 12,217 11,868 — 11,868 Wealth management 8,946 — 8,946 7,571 — 7,571 Other, net 1,741 260 2,001 1,420 793 2,213 Total noninterest income $ 39,046 $ 17,365 $ 56,411 $ 33,813 $ 35,698 $ 69,511 (1) Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, accretion of the FDIC indemnification asset, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and security gains (losses), net . Six Months Ended June 30, 2021 Six Months Ended June 30, 2020 Topic 606 Not Topic 606 (1) Total Topic 606 Not Topic 606 (1) Total General Banking Segment Service charges on deposit accounts $ 14,929 $ — $ 14,929 $ 16,392 $ — $ 16,392 Bank card and other fees 15,703 2,052 17,755 13,275 (217 ) 13,058 Mortgage banking, net — 38,137 38,137 — 61,228 61,228 Wealth management 20 — 20 165 — 165 Other, net 3,087 891 3,978 3,118 1,266 4,384 Total noninterest income $ 33,739 $ 41,080 $ 74,819 $ 32,950 $ 62,277 $ 95,227 Wealth Management Segment Service charges on deposit accounts $ 40 $ — $ 40 $ 37 $ — $ 37 Bank card and other fees 18 — 18 14 — 14 Wealth management 17,342 — 17,342 15,943 — 15,943 Other, net 67 16 83 50 22 72 Total noninterest income $ 17,467 $ 16 $ 17,483 $ 16,044 $ 22 $ 16,066 Insurance Segment Insurance commissions $ 24,662 $ — $ 24,662 $ 23,418 $ — $ 23,418 Other, net 30 — 30 64 — 64 Total noninterest income $ 24,692 $ — $ 24,692 $ 23,482 $ — $ 23,482 Consolidated Service charges on deposit accounts $ 14,969 $ — $ 14,969 $ 16,429 $ — $ 16,429 Bank card and other fees 15,721 2,052 17,773 13,289 (217 ) 13,072 Mortgage banking, net — 38,137 38,137 — 61,228 61,228 Insurance commissions 24,662 — 24,662 23,418 — 23,418 Wealth management 17,362 — 17,362 16,108 — 16,108 Other, net 3,184 907 4,091 3,232 1,288 4,520 Total noninterest income $ 75,898 $ 41,096 $ 116,994 $ 72,476 $ 62,299 $ 134,775 (1) Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, accretion of the FDIC indemnification asset, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and security gains (losses), net.

Defined Benefit and Other Pos_2

Defined Benefit and Other Postretirement Benefits (Tables)	6 Months Ended
	Jun. 30, 2021
Trustmark Capital Accumulation Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Periodic Benefit Cost	The following table presents information regarding the net periodic benefit cost for the Continuing Plan for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Service cost $ 63 $ 63 $ 126 $ 127 Interest cost 43 61 86 121 Expected return on plan assets (32 ) (39 ) (65 ) (77 ) Recognized net loss due to lump sum settlements — 40 — 40 Recognized net actuarial loss 148 82 297 163 Net periodic benefit cost $ 222 $ 207 $ 444 $ 374
Supplemental Retirement Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Periodic Benefit Cost	The following table presents information regarding the net periodic benefit cost for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Service cost $ 19 $ 20 $ 38 $ 39 Interest cost 277 387 570 801 Amortization of prior service cost 28 38 56 75 Recognized net actuarial loss 295 236 601 482 Net periodic benefit cost $ 619 $ 681 $ 1,265 $ 1,397

Stock and Incentive Compensat_2

Stock and Incentive Compensation (Tables)	6 Months Ended
	Jun. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Plan Activity	The following tables summarize the Stock Plan activity for the periods presented: Three Months Ended June 30, 2021 Performance Awards and Units Time-Vested Awards and Units Nonvested shares, beginning of period 144,554 362,556 Granted — 2,750 Released from restriction — (8,846 ) Forfeited (2,585 ) (4,405 ) Nonvested shares, end of period 141,969 352,055 Six Months Ended June 30, 2021 Performance Awards and Units Time-Vested Awards and Units Nonvested shares, beginning of period 145,042 301,619 Granted 53,273 176,022 Released from restriction (44,536 ) (120,290 ) Forfeited (11,810 ) (5,296 ) Nonvested shares, end of period 141,969 352,055
Compensation Expense for Awards and Units Under Stock Plan	The following table presents information regarding compensation expense for awards and units under the Stock Plan for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Performance awards and units $ 324 $ 456 $ 206 $ (57 ) Time-vested awards and units 890 818 3,189 2,725 Total compensation expense $ 1,214 $ 1,274 $ 3,395 $ 2,668

Contingencies (Tables)

Contingencies (Tables)	6 Months Ended
	Jun. 30, 2021
Commitments And Contingencies Disclosure [Abstract]
Summary of Changes in ACL on Off-balance Sheet Credit Exposures	Changes in the ACL on off-balance sheet credit exposures were as follows for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Balance at beginning of period $ 29,205 $ 36,421 $ 38,572 $ — FASB ASU 2016-13 adoption adjustment — — — 29,638 PCL, off-balance sheet credit exposures (1) 4,528 6,242 (4,839 ) 13,025 Balance at end of period $ 33,733 $ 42,663 $ 33,733 $ 42,663 (1) During the second quarter of 2021, Trustmark reclassified its credit loss expense related to off-balance sheet credit exposures from noninterest expense to provision for credit losses, off-balance sheet credit exposures. Prior periods have been reclassified accordingly.

Earnings Per Share (EPS) (Table

Earnings Per Share (EPS) (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Weighted-Average Shares Used to Calculate Basic and Diluted EPS	The following table reflects weighted-average shares used to calculate basic and diluted EPS for the periods presented (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Basic shares 63,215 63,416 63,305 63,586 Dilutive shares 195 139 161 136 Diluted shares 63,410 63,555 63,466 63,722
Weighted-Average Antidilutive Stock Awards Excluded from Determining Diluted EPS	Weighted-average antidilutive stock awards were excluded in determining diluted EPS. The following table reflects weighted-average antidilutive stock awards for the periods presented (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Weighted-average antidilutive stock awards 1 11 77 63

Statements of Cash Flows (Table

Statements of Cash Flows (Tables)	6 Months Ended
	Jun. 30, 2021
Supplemental Cash Flow Information [Abstract]
Cash Flows Supplementary Disclosures	The following table reflects specific transaction amounts for the periods presented ($ in thousands): Six Months Ended June 30, 2021 2020 Income taxes paid $ 13,045 $ 23,309 Interest expense paid on deposits and borrowings 13,815 26,808 Noncash transfers from loans to other real estate 382 406 Finance right-of-use assets resulting from lease liabilities 92 — Operating right-of-use assets resulting from lease liabilities 4,278 671

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2021
Stockholders Equity Note [Abstract]
Table of Actual Regulatory Capital Amounts and Ratios	The following table provides Trustmark’s and TNB’s actual regulatory capital amounts and ratios under regulatory capital standards in effect at June 30, 2021 and December 31, 2020 ($ in thousands): Actual Regulatory Capital Minimum To Be Well Amount Ratio Requirement Capitalized At June 30, 2021: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,441,102 11.76 % 7.00 % n/a Trustmark National Bank 1,491,066 12.17 % 7.00 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,501,102 12.25 % 8.50 % n/a Trustmark National Bank 1,491,066 12.17 % 8.50 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,728,478 14.10 % 10.50 % n/a Trustmark National Bank 1,595,510 13.02 % 10.50 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,501,102 9.00 % 4.00 % n/a Trustmark National Bank 1,491,066 8.96 % 4.00 % 5.00 % At December 31, 2020: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,395,844 11.62 % 7.00 % n/a Trustmark National Bank 1,412,015 11.75 % 7.00 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,455,844 12.11 % 8.50 % n/a Trustmark National Bank 1,412,015 11.75 % 8.50 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,696,794 14.12 % 10.50 % n/a Trustmark National Bank 1,530,044 12.73 % 10.50 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,455,844 9.33 % 4.00 % n/a Trustmark National Bank 1,412,015 9.07 % 4.00 % 5.00 %
Net Change in Components of Accumulated Other Comprehensive Income (Loss) and the Related Tax Effects	Three Months Ended June 30, 2021 Three Months Ended June 30, 2020 Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising during the period $ 6,612 $ (1,653 ) $ 4,959 $ 2,648 $ (662 ) $ 1,986 Change in net unrealized holding loss on securities transferred to held to maturity 736 (184 ) 552 778 (195 ) 583 Total securities available for sale and transferred securities 7,348 (1,837 ) 5,511 3,426 (857 ) 2,569 Pension and other postretirement benefit plans: Reclassification adjustments for changes realized in net income: Net change in prior service costs 28 (7 ) 21 38 (10 ) 28 Recognized net loss due to lump sum settlements — — — 40 (10 ) 30 Change in net actuarial loss 443 (110 ) 333 318 (78 ) 240 Total pension and other postretirement benefit plans 471 (117 ) 354 396 (98 ) 298 Total other comprehensive income (loss) $ 7,819 $ (1,954 ) $ 5,865 $ 3,822 $ (955 ) $ 2,867 Six Months Ended June 30, 2021 Six Months Ended June 30, 2020 Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Before Tax Amount Tax (Expense) Benefit Net of Tax Amount Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising during the period $ (15,188 ) $ 3,797 $ (11,391 ) $ 43,155 $ (10,789 ) $ 32,366 Change in net unrealized holding loss on securities transferred to held to maturity 1,447 (362 ) 1,085 1,639 (410 ) 1,229 Total securities available for sale and transferred securities (13,741 ) 3,435 (10,306 ) 44,794 (11,199 ) 33,595 Pension and other postretirement benefit plans: Reclassification adjustments for changes realized in net income: Net change in prior service costs 56 (14 ) 42 75 (19 ) 56 Recognized net loss due to lump sum settlements — — — 40 (10 ) 30 Change in net actuarial loss 898 (224 ) 674 645 (161 ) 484 Total pension and other postretirement benefit plans 954 (238 ) 716 760 (190 ) 570 Total other comprehensive income (loss) $ (12,787 ) $ 3,197 $ (9,590 ) $ 45,554 $ (11,389 ) $ 34,165
Summary of Changes in Balances of Accumulated Other Comprehensive Income (Loss)	The following table presents the changes in the balances of each component of accumulated other comprehensive income (loss) for the periods presented ($ in thousands). All amounts are presented net of tax. Securities Available and Transferred Securities Defined Benefit Pension Items Total Balance at January 1, 2021 $ 17,331 $ (18,382 ) $ (1,051 ) Other comprehensive income (loss) before reclassification (10,306 ) — (10,306 ) Amounts reclassified from accumulated other comprehensive income (loss) — 716 716 Net other comprehensive income (loss) (10,306 ) 716 (9,590 ) Balance at June 30, 2021 $ 7,025 $ (17,666 ) $ (10,641 ) Balance at January 1, 2020 $ (8,017 ) $ (15,583 ) $ (23,600 ) Other comprehensive income (loss) before reclassification 33,595 — 33,595 Amounts reclassified from accumulated other comprehensive income (loss) — 570 570 Net other comprehensive income (loss) 33,595 570 34,165 Balance at June 30, 2020 $ 25,578 $ (15,013 ) $ 10,565

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Measured at Fair Value Recurring Basis	The following tables summarize financial assets and financial liabilities measured at fair value on a recurring basis at June 30, 2021 and December 31, 2020, segregated by the level of valuation inputs within the fair value hierarchy utilized to measure fair value ($ in thousands). There were no transfers between fair value levels for the six months ended June 30, 2021 and the year ended December 31, 2020. June 30, 2021 Total Level 1 Level 2 Level 3 U.S. Treasury securities $ 30,025 $ 30,025 $ — $ — U.S. Government agency obligations 16,023 — 16,023 — Obligations of states and political subdivisions 5,807 — 5,807 — Mortgage-backed securities 2,496,884 — 2,496,884 — Securities available for sale 2,548,739 30,025 2,518,714 — Loans held for sale 332,132 — 332,132 — Mortgage servicing rights 80,764 — — 80,764 Other assets - derivatives 32,172 1,981 26,306 3,885 Other liabilities - derivatives 3,532 233 3,299 — December 31, 2020 Total Level 1 Level 2 Level 3 U.S. Government agency obligations $ 18,041 $ — $ 18,041 $ — Obligations of states and political subdivisions 5,835 — 5,835 — Mortgage-backed securities 1,967,939 — 1,967,939 — Securities available for sale 1,991,815 — 1,991,815 — Loans held for sale 446,951 — 446,951 — Mortgage servicing rights 66,464 — — 66,464 Other assets - derivatives 47,768 145 38,063 9,560 Other liabilities - derivatives 5,324 666 4,658 —
Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis	The changes in Level 3 assets measured at fair value on a recurring basis for the six months ended June 30, 2021 and 2020 are summarized as follows ($ in thousands): MSR Other Assets - Derivatives Balance, January 1, 2021 $ 66,464 $ 9,560 Total net (loss) gain included in Mortgage banking, net (1) (901 ) 5,857 Additions 15,201 — Sales — (11,532 ) Balance, June 30, 2021 $ 80,764 $ 3,885 The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held at June 30, 2021 $ 9,231 $ 2,592 Balance, January 1, 2020 $ 79,394 $ 1,439 Total net (loss) gain included in Mortgage banking, net (1) (33,979 ) 22,382 Additions 12,396 — Sales — (9,491 ) Balance, June 30, 2020 $ 57,811 $ 14,330 The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held at June 30, 2020 $ (27,158 ) $ 12,897 (1) Total net (loss) gain included in Mortgage banking, net relating to the MSR includes changes in fair value due to market changes and due to run-off.
Carrying Amounts and Estimated Fair Values of Financial Instruments	The carrying amounts and estimated fair values of financial instruments at June 30, 2021 and December 31, 2020, are as follows ($ in thousands): June 30, 2021 December 31, 2020 Carrying Value Estimated Fair Value Carrying Value Estimated Fair Value Financial Assets: Level 2 Inputs: Cash and short-term investments $ 2,267,224 $ 2,267,224 $ 1,952,554 $ 1,952,554 Securities held to maturity 433,012 452,288 538,072 563,115 Level 3 Inputs: Net LHFI and PPP loans 10,214,956 10,183,509 10,317,352 10,312,395 Financial Liabilities: Level 2 Inputs: Deposits 14,632,084 14,633,322 14,048,764 14,052,863 Federal funds purchased and securities sold under repurchase agreements 157,176 157,176 164,519 164,519 Other borrowings 117,223 117,221 168,252 168,252 Subordinated notes 122,932 128,750 122,921 127,500 Junior subordinated debt securities 61,856 48,866 61,856 46,083
Fair Value and the Contractual Principal Outstanding of the LHFS	The following table provides information about the fair value and the contractual principal outstanding of LHFS accounted for under the fair value option as of June 30, 2021 and December 31, 2020 ($ in thousands): June 30, 2021 December 31, 2020 Fair value of LHFS $ 236,719 $ 305,791 LHFS contractual principal outstanding 229,631 290,625 Fair value less unpaid principal $ 7,088 $ 15,166

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2021
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Instruments	The following tables disclose the fair value of derivative instruments in Trustmark’s consolidated balance sheets at June 30, 2021 and December 31, 2020 as well as the effect of these derivative instruments on Trustmark’s results of operations for the periods presented ($ in thousands): June 30, 2021 December 31, 2020 Derivatives not designated as hedging instruments Interest rate contracts: Exchange traded purchased options included in other assets $ 496 $ 145 OTC written options (rate locks) included in other assets 3,885 9,560 Futures contracts included in other assets 1,485 — Interest rate swaps included in other assets (1) 26,168 37,974 Credit risk participation agreements included in other assets 138 89 Futures contracts included in other liabilities — 34 Forward contracts included in other liabilities 587 3,145 Exchange traded written options included in other liabilities 233 632 Interest rate swaps included in other liabilities (1) 2,569 1,313 Credit risk participation agreements included in other liabilities 143 200 (1) In accordance with GAAP, the variation margin collateral payments made or received for interest rate swaps that are centrally cleared are legally characterized as settled. As a result, the centrally cleared interest rate swaps included in other assets and other liabilities are presented on a net basis in the accompanying consolidated balance sheets.
Effects of Derivative Instruments on Statements of Operations	Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 Derivatives not designated as hedging instruments: Amount of gain (loss) recognized in mortgage banking, net $ (1,614 ) $ 12,395 $ (10,812 ) $ 45,881 Amount of gain (loss) recognized in bank card and other fees (667 ) (76 ) 935 (1,736 )
Information about Financial Instruments that are Eligible for Offset in the Consolidated Balance Sheets	Information about financial instruments that are eligible for offset in the consolidated balance sheets as of June 30, 2021 and December 31, 2020 is presented in the following tables ($ in thousands): Offsetting of Derivative Assets As of June 30, 2021 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount Derivatives $ 26,168 $ — $ 26,168 $ (14 ) $ — $ 26,154 Offsetting of Derivative Liabilities As of June 30, 2021 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities presented in the Statement of Financial Position Financial Instruments Cash Collateral Posted Net Amount Derivatives $ 2,569 $ — $ 2,569 $ (14 ) $ (1,100 ) $ 1,455 Offsetting of Derivative Assets As of December 31, 2020 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Assets Gross Amounts Offset in the Statement of Financial Position Net Amounts of Assets presented in the Statement of Financial Position Financial Instruments Cash Collateral Received Net Amount Derivatives $ 37,974 $ — $ 37,974 $ — $ — $ 37,974 Offsetting of Derivative Liabilities As of December 31, 2020 Gross Amounts Not Offset in the Statement of Financial Position Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Statement of Financial Position Net Amounts of Liabilities presented in the Statement of Financial Position Financial Instruments Cash Collateral Posted Net Amount Derivatives $ 1,313 $ — $ 1,313 $ — $ (1,313 ) $ —

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2021
Segment Reporting [Abstract]
Schedule of Segment Information	The following table discloses financial information by reportable segment for the periods presented ($ in thousands): Three Months Ended June 30, Six Months Ended June 30, 2021 2020 2021 2020 General Banking Net interest income $ 118,169 $ 103,376 $ 219,277 $ 205,779 Provision for credit losses (1) 540 24,430 (19,326 ) 49,587 Noninterest income 35,167 50,051 74,819 95,227 Noninterest expense (1) 102,199 97,113 206,163 196,780 Income before income taxes 50,597 31,884 107,259 54,639 Income taxes 7,137 4,093 15,260 6,184 General banking net income $ 43,460 $ 27,791 $ 91,999 $ 48,455 Selected Financial Information Total assets $ 16,716,574 $ 15,378,653 $ 16,716,574 $ 15,378,653 Depreciation and amortization $ 11,046 $ 10,422 $ 21,910 $ 19,216 Wealth Management Net interest income $ 1,256 $ 1,576 $ 2,487 $ 3,080 Provision for credit losses (3 ) (3 ) (5 ) 2,204 Noninterest income 9,020 7,550 17,483 16,066 Noninterest expense 7,749 6,944 15,943 15,460 Income before income taxes 2,530 2,185 4,032 1,482 Income taxes 633 547 1,009 371 Wealth management net income $ 1,897 $ 1,638 $ 3,023 $ 1,111 Selected Financial Information Total assets $ 299,275 $ 232,467 $ 299,275 $ 232,467 Depreciation and amortization $ 66 $ 67 $ 134 $ 134 Insurance Net interest income $ (2 ) $ 48 $ (5 ) $ 93 Noninterest income 12,224 11,910 24,692 23,482 Noninterest expense 8,731 8,360 18,121 17,204 Income before income taxes 3,491 3,598 6,566 6,371 Income taxes 867 877 1,645 1,569 Insurance net income $ 2,624 $ 2,721 $ 4,921 $ 4,802 Selected Financial Information Total assets $ 82,283 $ 80,959 $ 82,283 $ 80,959 Depreciation and amortization $ 190 $ 171 $ 384 $ 306 Consolidated Net interest income $ 119,423 $ 105,000 $ 221,759 $ 208,952 Provision for credit losses (1) 537 24,427 (19,331 ) 51,791 Noninterest income 56,411 69,511 116,994 134,775 Noninterest expense (1) 118,679 112,417 240,227 229,444 Income before income taxes 56,618 37,667 117,857 62,492 Income taxes 8,637 5,517 17,914 8,124 Consolidated net income $ 47,981 $ 32,150 $ 99,943 $ 54,368 Selected Financial Information Total assets $ 17,098,132 $ 15,692,079 $ 17,098,132 $ 15,692,079 Depreciation and amortization $ 11,302 $ 10,660 $ 22,428 $ 19,656 (1) During the second quarter of 2021, Trustmark reclassified its credit loss expense related to off-balance sheet credit exposures from noninterest expense to provision for credit losses, off-balance sheet credit exposures. Prior periods have been reclassified accordingly

Business, Basis of Financial _2

Business, Basis of Financial Statement Presentation and Principles of Consolidation - Additional Information (Details) $ in Thousands	Jun. 05, 2020	Mar. 27, 2020USD ($)	Jun. 30, 2021USD ($)OfficeLoan	Jun. 30, 2021USD ($)OfficeLoan	Dec. 31, 2020USD ($)
Business Basis Of Financial Statement Presentation And Principles Of Consolidation [Line Items]
Number of offices | Office			180	180
Financing receivable, loan amount			$ 166,119	$ 166,119	$ 610,134
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member]
Business Basis Of Financial Statement Presentation And Principles Of Consolidation [Line Items]
Provision for CARES Act		$ 349,000,000
Financing Receivable, interest rate		1.00%
Financing Receivable, loan term		2 years
Financing receivable, loans outstanding | Loan			843	843
Financing receivable, loan amount			$ 166,100	$ 166,100
Financing receivable, deferred fees and costs			2,100	$ 2,100
Financing receivable, loans originated | Loan				5,727
Financing receivable, loan amount received				$ 354,500
Financing receivable loan originated deferred fees and cost			21,700	$ 21,700
Finance receivable loan deferred fees and cost recognized on sale			18,600
Finance receivable loan sold			$ 354,200
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member] | Minimum [Member]
Business Basis Of Financial Statement Presentation And Principles Of Consolidation [Line Items]
Financing Receivable, loan term	5 years
Financing Receivable, processing fee percentage	1.00%
Small Business Administration (SBA), CARES Act, Paycheck Protection Program [Member] | Maximum [Member]
Business Basis Of Financial Statement Presentation And Principles Of Consolidation [Line Items]
Financing receivable, existing loans maturity term	5 years
Financing receivable, guaranteed percentage	100.00%
Financing Receivable, processing fee percentage	5.00%

Securities Available for Sale_3

Securities Available for Sale and Held to Maturity - Amortized Cost and Estimated Fair Value of Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	$ 2,531,885	$ 1,959,773
Securities Available for Sale, Gross Unrealized Gains	24,991	33,889
Securities Available for Sale, Gross Unrealized (Losses)	(8,137)	(1,847)
Securities Available for Sale, Estimated Fair Value	2,548,739	1,991,815
Securities Held to Maturity, Amortized Cost	433,012	538,072
Securities Held to Maturity, Gross Unrealized Gains	19,319	25,101
Securities Held to Maturity, Gross Unrealized (Losses)	(43)	(58)
Securities Held to Maturity, Estimated Fair Value	452,288	563,115
U.S. Treasury Securities [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	29,988
Securities Available for Sale, Gross Unrealized Gains	37
Securities Available for Sale, Gross Unrealized (Losses)	0
Securities Available for Sale, Estimated Fair Value	30,025
Securities Held to Maturity, Amortized Cost	0
Securities Held to Maturity, Gross Unrealized Gains	0
Securities Held to Maturity, Gross Unrealized (Losses)	0
Securities Held to Maturity, Estimated Fair Value	0
U.S. Government Agency Obligations [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	16,289	18,378
Securities Available for Sale, Gross Unrealized Gains	121	144
Securities Available for Sale, Gross Unrealized (Losses)	(387)	(481)
Securities Available for Sale, Estimated Fair Value	16,023	18,041
Securities Held to Maturity, Amortized Cost	0	0
Securities Held to Maturity, Gross Unrealized Gains	0	0
Securities Held to Maturity, Gross Unrealized (Losses)	0	0
Securities Held to Maturity, Estimated Fair Value	0	0
Obligations of States and Political Subdivisions [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	5,167	5,198
Securities Available for Sale, Gross Unrealized Gains	640	637
Securities Available for Sale, Gross Unrealized (Losses)	0	0
Securities Available for Sale, Estimated Fair Value	5,807	5,835
Securities Held to Maturity, Amortized Cost	12,994	26,584
Securities Held to Maturity, Gross Unrealized Gains	117	258
Securities Held to Maturity, Gross Unrealized (Losses)	(5)	(3)
Securities Held to Maturity, Estimated Fair Value	13,106	26,839
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	47,365	55,193
Securities Available for Sale, Gross Unrealized Gains	1,091	1,672
Securities Available for Sale, Gross Unrealized (Losses)	(11)	(3)
Securities Available for Sale, Estimated Fair Value	48,445	56,862
Securities Held to Maturity, Amortized Cost	6,249	7,598
Securities Held to Maturity, Gross Unrealized Gains	289	382
Securities Held to Maturity, Gross Unrealized (Losses)	0	0
Securities Held to Maturity, Estimated Fair Value	6,538	7,980
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	1,975,328	1,421,861
Securities Available for Sale, Gross Unrealized Gains	15,621	20,768
Securities Available for Sale, Gross Unrealized (Losses)	(7,166)	(1,308)
Securities Available for Sale, Estimated Fair Value	1,983,783	1,441,321
Securities Held to Maturity, Amortized Cost	53,406	67,944
Securities Held to Maturity, Gross Unrealized Gains	1,773	2,397
Securities Held to Maturity, Gross Unrealized (Losses)	0	0
Securities Held to Maturity, Estimated Fair Value	55,179	70,341
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	277,411	409,883
Securities Available for Sale, Gross Unrealized Gains	6,620	9,600
Securities Available for Sale, Gross Unrealized (Losses)	(43)	(46)
Securities Available for Sale, Estimated Fair Value	283,988	419,437
Securities Held to Maturity, Amortized Cost	291,477	360,361
Securities Held to Maturity, Gross Unrealized Gains	15,470	19,678
Securities Held to Maturity, Gross Unrealized (Losses)	(38)	(55)
Securities Held to Maturity, Estimated Fair Value	306,909	379,984
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	180,337	49,260
Securities Available for Sale, Gross Unrealized Gains	861	1,068
Securities Available for Sale, Gross Unrealized (Losses)	(530)	(9)
Securities Available for Sale, Estimated Fair Value	180,668	50,319
Securities Held to Maturity, Amortized Cost	68,886	75,585
Securities Held to Maturity, Gross Unrealized Gains	1,670	2,386
Securities Held to Maturity, Gross Unrealized (Losses)	0	0
Securities Held to Maturity, Estimated Fair Value	$ 70,556	$ 77,971

Securities Available for Sale_4

Securities Available for Sale and Held to Maturity - Additional Information (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Dec. 31, 2013
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Reclassification of Securities available for sale to securities held to maturity			$ 1,099,000,000
Net unrealized holding loss on AFS Securities at date of transfer			46,600,000
Net unrealized holding losses on AFS Securities, net of tax at date of transfer			$ 28,800,000
Net unamortized, unrealized loss on transfer of securities	$ 7,500,000	$ 8,900,000
Net unamortized, unrealized loss on transfer of securities, net of tax	5,600,000	6,700,000
Credit loss recognized	0	0
Potential credit loss exposure	13,000,000	26,600,000
Pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law	2,163,000,000	1,964,000,000
Pledged securities providing additional contingency funding	0	0
30 Days or More Past Due [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Held-to-maturity, past due	0	0
Securities Available for Sale [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Accrued interest receivable	4,200,000	4,000,000
Securities Held to Maturity [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Accrued interest receivable	888,000	1,200,000
Reserve for credit loss	0	0
Held-to-maturity nonnaccrual	$ 0	$ 0

Securities Available for Sale_5

Securities Available for Sale and Held to Maturity - Securities Held to Maturity by Credit Rating, as Determined by Moody's (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Held to Maturity Amortized Cost	$ 433,012	$ 538,072
Aaa [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Held to Maturity Amortized Cost	420,018	511,488
Aaa1 to Aa3 [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Held to Maturity Amortized Cost	8,944	22,528
Not Rated [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Held to Maturity Amortized Cost	$ 4,050	$ 4,056

Securities Available for Sale_6

Securities Available for Sale and Held to Maturity - Securities with Gross Unrealized Losses, Segregated by Length of Impairment (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	$ 1,037,631	$ 355,939
Estimated Fair Value, 12 Months or More	11,319	12,493
Estimated Fair Value, Total	1,048,950	368,432
Gross Unrealized (Losses), Less than 12 Months	(7,782)	(1,412)
Gross Unrealized (Losses), 12 Months or More	(398)	(493)
Gross Unrealized (Losses), Total	(8,180)	(1,905)
U.S. Government Agency Obligations [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	0	0
Estimated Fair Value, 12 Months or More	10,003	11,167
Estimated Fair Value, Total	10,003	11,167
Gross Unrealized (Losses), Less than 12 Months	0	0
Gross Unrealized (Losses), 12 Months or More	(387)	(481)
Gross Unrealized (Losses), Total	(387)	(481)
Obligations of States and Political Subdivisions [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	3,206	0
Estimated Fair Value, 12 Months or More	667	667
Estimated Fair Value, Total	3,873	667
Gross Unrealized (Losses), Less than 12 Months	(3)	0
Gross Unrealized (Losses), 12 Months or More	(2)	(3)
Gross Unrealized (Losses), Total	(5)	(3)
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	1,143	1,636
Estimated Fair Value, 12 Months or More	0	0
Estimated Fair Value, Total	1,143	1,636
Gross Unrealized (Losses), Less than 12 Months	(11)	(3)
Gross Unrealized (Losses), 12 Months or More	0	0
Gross Unrealized (Losses), Total	(11)	(3)
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	924,404	324,905
Estimated Fair Value, 12 Months or More	0	0
Estimated Fair Value, Total	924,404	324,905
Gross Unrealized (Losses), Less than 12 Months	(7,166)	(1,308)
Gross Unrealized (Losses), 12 Months or More	0	0
Gross Unrealized (Losses), Total	(7,166)	(1,308)
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	19,828	29,398
Estimated Fair Value, 12 Months or More	0	0
Estimated Fair Value, Total	19,828	29,398
Gross Unrealized (Losses), Less than 12 Months	(81)	(101)
Gross Unrealized (Losses), 12 Months or More	0	0
Gross Unrealized (Losses), Total	(81)	(101)
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	89,050	0
Estimated Fair Value, 12 Months or More	649	659
Estimated Fair Value, Total	89,699	659
Gross Unrealized (Losses), Less than 12 Months	(521)	0
Gross Unrealized (Losses), 12 Months or More	(9)	(9)
Gross Unrealized (Losses), Total	$ (530)	$ (9)

Securities Available for Sale_7

Securities Available for Sale and Held to Maturity - Contractual Maturities of Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Securities Available for Sale, Amortized Cost [Abstract]
Due in one year or less	$ 1,354
Due after one year through five years	16,721
Due after five years through ten years	16,191
Due after ten years	17,178
Total amortized cost, before mortgage-backed securities	51,444
Mortgage-backed securities	2,480,441
Securities Available for Sale, Amortized Cost	2,531,885	$ 1,959,773
Securities Available for Sale, Estimated Fair Value [Abstract]
Due in one year or less	1,376
Due after one year through five years	16,784
Due after five years through ten years	16,189
Due after ten years	17,506
Total fair value, before mortgage-backed securities	51,855
Mortgage-backed securities	2,496,884
Total	2,548,739	1,991,815
Securities Held to Maturity, Amortized Cost [Abstract]
Due in one year or less	7,660
Due after one year through five years	5,334
Due after five years through ten years	0
Due after ten years	0
Total amortized cost, before mortgage-backed securities	12,994
Mortgage-backed securities	420,018
Securities Held to Maturity, Amortized Cost	433,012	538,072
Securities Held to Maturity, Estimated Fair Value [Abstract]
Due in one year or less	7,687
Due after one year through five years	5,419
Due after five years through ten years	0
Due after ten years	0
Total fair value, before mortgage-backed securities	13,106
Mortgage-backed securities	439,182
Total	$ 452,288	$ 563,115

Loans Held for Investment (LH_3

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Loan Portfolio Held for Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Loan Portfolio [Abstract]
Total LHFI	$ 10,152,869	$ 9,824,524
Less allowance for credit losses (ACL), LHFI	104,032	117,306
Net LHFI	10,048,837	9,707,218
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	532,637	514,056
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	1,302,663	1,216,400
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	507,733	524,732
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	1,078,622	1,065,964
Other Construction [Member] | Other Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	827,665	794,983
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	2,819,662	2,709,026
Commercial and Industrial Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	1,326,605	1,309,078
Consumer Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	156,075	164,386
State and Other Political Subdivision Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	1,136,764	1,000,776
Other Commercial Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	$ 464,443	$ 525,123

Loans Held for Investment (LH_4

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Additional Information (Details 1) $ in Millions	6 Months Ended
	Jun. 30, 2021USD ($)Region	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]
Accrued interest receivable	$ 29.7		$ 33
Maximum concentration of loan as a percentage of total LHFI	10.00%
Key market regions | Region	5
LHFI classified as TDRs	$ 25.1	$ 26.9
LHFI classified as TDRs from credits with interest only payments and credits renewed at a rate that was not commensurate with that of new debt with similar risk	16.4	14.6
Unused commitments on TDRs	2	5.6
Financing receivable, related allowance	3.9	2
Financing receivable, related charge-offs	$ 3.7	$ 2.2
Period of extension on interest part of loans modified related to COVID-19	90 days
Period of extension on full payment deferrals part of loans modified related to COVID-19	90 days
Balance of loans remaining under some type of concession related to COVID-19	$ 19		$ 34.2

Loans Held for Investment (LH_5

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Schedule of Amortized Cost Basis of Loans on Nonaccrual Status (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	$ 22,023	$ 32,413
Total Nonaccrual	51,448	63,128
Loans Past Due 90 Days or More Still Accruing	423	1,576
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	5,903	5,756
Total Nonaccrual	6,165	5,985
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	1,376	1,895
Total Nonaccrual	3,731	4,487
Loans Past Due 90 Days or More Still Accruing	52	79
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	11,532	12,037
Total Nonaccrual	13,563	15,197
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	57	60
Total Nonaccrual	175	185
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Nonaccrual	12,222	11,807
Loans Past Due 90 Days or More Still Accruing	255	1,257
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	3,078	12,665
Total Nonaccrual	6,042	15,618
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Nonaccrual	53	86
Loans Past Due 90 Days or More Still Accruing	116	240
State and Other Political Subdivision Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Nonaccrual	3,854	3,970
Other Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	77
Total Nonaccrual	$ 5,643	$ 5,793

Loans Held for Investment (LH_6

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Aging Analysis of Past Due and Nonaccrual LHFI by Loan Type (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	$ 29,906	$ 24,471
Nonaccrual	51,448	63,128
Current Loans	10,122,963	9,800,053
Total LHFI	10,152,869	9,824,524
Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	5,685	9,615
Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	7,430	5,304
Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	16,791	9,552
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	6,131	534
Nonaccrual	6,165	5,985
Current Loans	526,506	513,522
Total LHFI	532,637	514,056
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	352	339
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	5,583	34
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	196	161
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	2,501	2,924
Nonaccrual	3,731	4,487
Current Loans	505,232	521,808
Total LHFI	507,733	524,732
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,160	1,505
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	538	523
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	803	896
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	9,107	9,690
Nonaccrual	12,222	11,807
Current Loans	1,293,556	1,206,710
Total LHFI	1,302,663	1,216,400
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	2,230	3,291
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,061	1,289
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	5,816	5,110
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	1,138	1,892
Nonaccrual	13,563	15,197
Current Loans	2,818,524	2,707,134
Total LHFI	2,819,662	2,709,026
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	422	920
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	23
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	693	972
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	170	311
Nonaccrual	175	185
Current Loans	1,078,452	1,065,653
Total LHFI	1,078,622	1,065,964
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	63	103
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		101
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	107	107
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	4,153	2,010
Nonaccrual	6,042	15,618
Current Loans	1,322,452	1,307,068
Total LHFI	1,326,605	1,309,078
Commercial and Industrial Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	291	271
Commercial and Industrial Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	65	196
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	3,797	1,543
Other Construction [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Current Loans	827,665	794,983
Total LHFI	827,665	794,983
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	970	1,356
Nonaccrual	53	86
Current Loans	155,105	163,030
Total LHFI	156,075	164,386
Consumer Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	767	926
Consumer Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	87	190
Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	116	240
State and Other Political Subdivision Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	177	294
Nonaccrual	3,854	3,970
Current Loans	1,136,587	1,000,482
Total LHFI	1,136,764	1,000,776
State and Other Political Subdivision Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		117
State and Other Political Subdivision Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	177	177
Other Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	5,559	5,460
Nonaccrual	5,643	5,793
Current Loans	458,884	519,663
Total LHFI	464,443	525,123
Other Commercial Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	400	2,143
Other Commercial Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	73	2,971
Other Commercial Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	$ 5,086	$ 346

Loans Held for Investment (LH_7

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Impact of Modifications Classified as Troubled Debt Restructurings (Details) - Troubled Debt Restructurings [Member] $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)Contract	Jun. 30, 2020USD ($)Contract	Jun. 30, 2021USD ($)Contract	Jun. 30, 2020USD ($)Contract
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	13	8	16	19
Pre-Modification Outstanding Recorded Investment	$ 12,048	$ 4,253	$ 12,188	$ 6,356
Post-Modification Outstanding Recorded Investment	$ 12,048	$ 4,227	$ 12,188	$ 6,330
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	5		5
Pre-Modification Outstanding Recorded Investment	$ 5,582		$ 5,582
Post-Modification Outstanding Recorded Investment	$ 5,582		$ 5,582
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	3	3	3	8
Pre-Modification Outstanding Recorded Investment	$ 37	$ 206	$ 37	$ 707
Post-Modification Outstanding Recorded Investment	$ 37	$ 210	$ 37	$ 711
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	1	1	1	1
Pre-Modification Outstanding Recorded Investment	$ 377	$ 139	$ 377	$ 139
Post-Modification Outstanding Recorded Investment	$ 377	$ 139	$ 377	$ 139
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	1		3
Pre-Modification Outstanding Recorded Investment	$ 123		$ 249
Post-Modification Outstanding Recorded Investment	$ 123		$ 249
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	1		2	2
Pre-Modification Outstanding Recorded Investment	$ 1,000		$ 1,014	$ 1,582
Post-Modification Outstanding Recorded Investment	$ 1,000		$ 1,014	$ 1,582
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract		2		6
Pre-Modification Outstanding Recorded Investment		$ 6		$ 26
Post-Modification Outstanding Recorded Investment		$ 6		$ 26
State and Other Political Subdivision Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract		2		2
Pre-Modification Outstanding Recorded Investment		$ 3,902		$ 3,902
Post-Modification Outstanding Recorded Investment		$ 3,872		$ 3,872
Other Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	2		2
Pre-Modification Outstanding Recorded Investment	$ 4,929		$ 4,929
Post-Modification Outstanding Recorded Investment	$ 4,929		$ 4,929

Loans Held for Investment (LH_8

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Troubled Debt Restructuring Subsequently Defaulted (Details) - Troubled Debt Restructurings [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)Contract	Jun. 30, 2020USD ($)Contract
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	3	5
Recorded Investment | $	$ 5,007	$ 641
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	0	3
Recorded Investment | $	$ 0	$ 420
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	0	1
Recorded Investment | $	$ 0	$ 139
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	0	1
Recorded Investment | $	$ 0	$ 82
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	1	0
Recorded Investment | $	$ 78	$ 0
Other Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	2	0
Recorded Investment | $	$ 4,929	$ 0

Loans Held for Investment (LH_9

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Troubled Debt Restructuring Related to Loans Held for Investment, Excluding Covered Loans, by Loan Type (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Financing Receivable Modifications [Line Items]
Nonaccrual	$ 51,448	$ 63,128
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	6,165	5,985
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	3,731	4,487
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	13,563	15,197
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	6,042	15,618
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	53	86
State and Other Political Subdivision Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	3,854	3,970
Other Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	5,643	$ 5,793
Troubled Debt Restructurings [Member]
Financing Receivable Modifications [Line Items]
Accruing	2,552		$ 1,589
Nonaccrual	22,563		25,290
Total	25,115		26,879
Troubled Debt Restructurings [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	0		0
Nonaccrual	5,593		14
Total	5,593		14
Troubled Debt Restructurings [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	0		71
Nonaccrual	1,160		3,761
Total	1,160		3,832
Troubled Debt Restructurings [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	0		0
Nonaccrual	3,090		3,010
Total	3,090		3,010
Troubled Debt Restructurings [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	52
Nonaccrual	2,414
Total	2,466
Troubled Debt Restructurings [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing	2,500		1,500
Nonaccrual	1,608		14,487
Total	4,108		15,987
Troubled Debt Restructurings [Member] | Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing	0		18
Nonaccrual	12		21
Total	12		39
Troubled Debt Restructurings [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing	0		0
Nonaccrual	3,677		3,872
Total	3,677		3,872
Troubled Debt Restructurings [Member] | Other Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing	0		0
Nonaccrual	5,009		125
Total	$ 5,009		$ 125

Loans Held for Investment (L_10

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Schedule of Amortized Cost Basis of Collateral-Dependent Loans by Class of Loans and Collateral Type (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	$ 32,878	$ 43,409
Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	23,361	24,410
Equipment and Machinery [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	72	425
Inventory and Receivables [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	6,316	6,857
Vehicles [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	78	135
Miscellaneous [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	3,051	11,582
Construction, Land Development and Other Land [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	5,903	5,756
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	5,903	5,756
Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		454
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		454
Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	11,763	12,037
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	11,763	12,037
Other Real Estate Secured [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	57	60
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	57	60
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	1,376	1,441
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	1,376	1,441
Commercial and Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	4,474	14,076
Commercial and Industrial Loans [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	43	86
Commercial and Industrial Loans [Member] | Equipment and Machinery [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	72	425
Commercial and Industrial Loans [Member] | Inventory and Receivables [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	4,285	4,899
Commercial and Industrial Loans [Member] | Vehicles [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	74	135
Commercial and Industrial Loans [Member] | Miscellaneous [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		8,531
State and Other Political Subdivision Loans [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	3,854	3,970
State and Other Political Subdivision Loans [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	3,854	3,970
Other Commercial Loans [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	5,451	5,615
Other Commercial Loans [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	365	606
Other Commercial Loans [Member] | Inventory and Receivables [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	2,031	1,958
Other Commercial Loans [Member] | Vehicles [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	4
Other Commercial Loans [Member] | Miscellaneous [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	$ 3,051	$ 3,051

Loans Held for Investment (L_11

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Additional Information (Details 2)	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)KeyRatio	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Financing Receivable, Recorded Investment, Aging [Abstract]
Number of days used as baseline in evaluating collateral documentation exceptions for loan policy			90 days
Number of key quality ratios | KeyRatio			6
Exposure for commercial non accrual loans to be reviewed on individual basis	$ 500,000		$ 500,000
Exposure for commercial accrual loans deemed to be reviewed on individual basis	500,000		500,000
LHFS past due 90 days or more	81,500,000		$ 81,500,000		$ 119,400,000
Percentage of outstanding principal to be repurchased under GNMA optional repurchase program			100.00%
Financing Receivable [Abstract]
PCL	(3,991,000)	$ 18,185,000	$ (14,492,000)	$ 38,766,000
Allowance for Credit Losses, ACL [Member]
Financing Receivable [Abstract]
PCL	(3,991,000)	18,185,000	(14,492,000)	38,766,000
Allowance for Credit Losses, ACL [Member] | Other Construction [Member]
Financing Receivable [Abstract]
PCL	1,400,000
Allowance for Credit Losses, ACL [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable [Abstract]
PCL	1,600,000
Allowance for Credit Losses, ACL [Member] | Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
PCL	(3,171,000)	(1,908,000)	880,000	(3,932,000)
Allowance for Credit Losses, ACL [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable [Abstract]
PCL	218,000	(27,000)	43,000	(1,270,000)
Allowance for Credit Losses, ACL [Member] | Other Commercial Loans [Member]
Financing Receivable [Abstract]
PCL	402,000	$ 307,000	(841,000)	$ (843,000)
Minimum [Member]
Financing Receivable [Abstract]
Credit amount used as baseline in evaluating loan policy	$ 100,000		$ 100,000

Loans Held for Investment (L_12

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of Amortized Cost Basis of Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	$ 1,792,042	$ 2,729,685
Term Loans by Origination Year, Before Latest Fiscal Year	2,254,397	2,007,251
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	1,866,611	1,283,113
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,010,210	697,511
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	541,833	749,451
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	1,550,575	1,136,893
Financing Receivable, Revolving Loans	1,137,201	1,220,620
Total LHFI	10,152,869	9,824,524
Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	1,326,605	1,309,078
State and Other Political Subdivision Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	1,136,764	1,000,776
Other Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	464,443	525,123
Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	156,075	164,386
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	532,637	514,056
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	507,733	524,732
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	1,078,622	1,065,964
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	2,819,662	2,709,026
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	827,665	794,983
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	1,302,663	1,216,400
Commercial LHFI [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	1,412,683	2,304,725
Term Loans by Origination Year, Before Latest Fiscal Year	1,895,480	1,731,911
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	1,662,814	1,072,826
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	854,254	593,152
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	459,952	634,209
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	1,180,204	791,222
Financing Receivable, Revolving Loans	742,111	814,179
Total LHFI	8,207,498	7,942,224
Commercial LHFI [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	285,003	457,222
Term Loans by Origination Year, Before Latest Fiscal Year	311,215	167,117
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	142,902	87,348
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	46,134	81,720
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	61,627	61,323
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	80,604	48,242
Financing Receivable, Revolving Loans	399,120	406,106
Total LHFI	1,326,605	1,309,078
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	277,330	444,304
Term Loans by Origination Year, Before Latest Fiscal Year	304,664	165,163
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	140,848	77,611
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	43,836	77,985
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	57,941	59,131
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	77,328	43,214
Financing Receivable, Revolving Loans	367,148	372,486
Total LHFI	1,269,095	1,239,894
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	1,032	677
Term Loans by Origination Year, Before Latest Fiscal Year	385	45
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	212
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	715
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	97
Financing Receivable, Revolving Loans	678	240
Total LHFI	3,119	962
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	6,640	12,090
Term Loans by Origination Year, Before Latest Fiscal Year	6,032	1,814
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	1,799	9,737
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,472	3,735
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	3,589	2,160
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	3,251	5,024
Financing Receivable, Revolving Loans	31,294	33,380
Total LHFI	54,077	67,940
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	1	151
Term Loans by Origination Year, Before Latest Fiscal Year	134	95
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	43
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	111
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		32
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	25	4
Total LHFI	314	282
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	232,696	250,363
Term Loans by Origination Year, Before Latest Fiscal Year	193,403	79,595
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	92,035	41,334
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	36,643	114,064
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	100,328	132,634
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	473,590	381,340
Financing Receivable, Revolving Loans	8,069	1,446
Total LHFI	1,136,764	1,000,776
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	232,696	250,363
Term Loans by Origination Year, Before Latest Fiscal Year	193,403	79,595
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	92,035	41,334
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	36,643	113,817
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	100,328	132,634
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	466,386	372,831
Financing Receivable, Revolving Loans	8,069	1,446
Total LHFI	1,129,560	992,020
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	3,350	4,018
Total LHFI	3,350	4,018
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		247
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	3,854	4,491
Total LHFI	3,854	4,738
Commercial LHFI [Member] | Other Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	53,866	109,113
Term Loans by Origination Year, Before Latest Fiscal Year	60,814	73,089
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	71,880	21,452
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	15,562	9,729
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	8,607	34,188
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	62,357	30,738
Financing Receivable, Revolving Loans	191,357	246,814
Total LHFI	464,443	525,123
Commercial LHFI [Member] | Other Commercial Loans [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	53,866	101,230
Term Loans by Origination Year, Before Latest Fiscal Year	53,529	70,990
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	69,767	20,769
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	15,147	9,723
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	8,607	33,481
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	62,018	30,715
Financing Receivable, Revolving Loans	176,553	225,533
Total LHFI	439,487	492,441
Commercial LHFI [Member] | Other Commercial Loans [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		7,500
Financing Receivable, Revolving Loans		11,333
Total LHFI		18,833
Commercial LHFI [Member] | Other Commercial Loans [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		381
Term Loans by Origination Year, Before Latest Fiscal Year	7,235	2,099
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	2,113	683
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	415	6
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		707
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	316
Financing Receivable, Revolving Loans	14,804	9,948
Total LHFI	24,883	13,824
Commercial LHFI [Member] | Other Commercial Loans [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		2
Term Loans by Origination Year, Before Latest Fiscal Year	50
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	23	23
Total LHFI	73	25
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	190,650	292,637
Term Loans by Origination Year, Before Latest Fiscal Year	163,349	66,441
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	40,324	27,627
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	15,474	4,499
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1,892	3,768
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	5,385	3,628
Financing Receivable, Revolving Loans	33,860	28,649
Total LHFI	450,934	427,249
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	188,112	287,218
Term Loans by Origination Year, Before Latest Fiscal Year	163,334	62,078
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	36,863	26,401
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	15,430	4,487
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1,880	3,274
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	5,231	3,564
Financing Receivable, Revolving Loans	33,860	28,548
Total LHFI	444,710	415,570
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	2,538	5,419
Term Loans by Origination Year, Before Latest Fiscal Year	15	4,363
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	3,461	1,226
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	44	12
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	12	494
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	112	22
Financing Receivable, Revolving Loans		101
Total LHFI	6,182	11,637
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	42	42
Total LHFI	42	42
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	20,984	36,578
Term Loans by Origination Year, Before Latest Fiscal Year	29,297	19,604
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	15,982	16,363
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	13,062	9,946
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	7,742	10,575
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	8,784	5,123
Financing Receivable, Revolving Loans	7,366	12,436
Total LHFI	103,217	110,625
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	20,192	35,139
Term Loans by Origination Year, Before Latest Fiscal Year	28,659	19,596
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	15,975	15,399
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	12,834	9,605
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	7,585	10,273
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	8,108	4,786
Financing Receivable, Revolving Loans	7,366	8,486
Total LHFI	100,719	103,284
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	143	255
Term Loans by Origination Year, Before Latest Fiscal Year	181
Term Loans by Origination Year, Two Years Before Latest Fiscal Year		50
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	47
Total LHFI	371	305
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	649	1,155
Term Loans by Origination Year, Before Latest Fiscal Year	432	8
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	7	914
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	181	341
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	157	302
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	676	337
Financing Receivable, Revolving Loans		3,950
Total LHFI	2,102	7,007
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		29
Term Loans by Origination Year, Before Latest Fiscal Year	25
Total LHFI	25	29
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	143,523	165,452
Term Loans by Origination Year, Before Latest Fiscal Year	100,716	376,779
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	451,580	347,490
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	256,381	48,626
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	33,260	90,380
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	80,175	24,643
Financing Receivable, Revolving Loans	12,611	12,116
Total LHFI	1,078,246	1,065,486
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	139,687	146,803
Term Loans by Origination Year, Before Latest Fiscal Year	90,717	376,765
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	451,580	347,472
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	256,369	48,626
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	33,260	89,824
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	79,188	23,680
Financing Receivable, Revolving Loans	12,611	12,116
Total LHFI	1,063,412	1,045,286
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	808	841
Total LHFI	808	841
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	3,836	18,649
Term Loans by Origination Year, Before Latest Fiscal Year	9,999	14
Term Loans by Origination Year, Two Years Before Latest Fiscal Year		18
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	12
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		556
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	179	122
Total LHFI	14,026	19,359
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	306,369	730,062
Term Loans by Origination Year, Before Latest Fiscal Year	647,581	523,350
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	616,814	449,736
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	451,832	310,494
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	246,496	298,877
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	469,309	297,508
Financing Receivable, Revolving Loans	81,223	98,877
Total LHFI	2,819,624	2,708,904
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	281,444	697,439
Term Loans by Origination Year, Before Latest Fiscal Year	635,065	496,476
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	590,473	442,264
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	445,938	293,072
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	241,109	254,747
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	404,951	251,219
Financing Receivable, Revolving Loans	79,715	96,098
Total LHFI	2,678,695	2,531,315
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	10,324	13,452
Term Loans by Origination Year, Before Latest Fiscal Year	9,729	6,139
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	1,445	2,956
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,683	4,466
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1,640	4,957
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	4,874	20,545
Total LHFI	29,695	52,515
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	14,553	19,119
Term Loans by Origination Year, Before Latest Fiscal Year	2,787	20,572
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	24,746	4,516
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	4,211	12,956
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	3,747	38,956
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	59,278	25,438
Financing Receivable, Revolving Loans	1,508	2,779
Total LHFI	110,830	124,336
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	48	52
Term Loans by Origination Year, Before Latest Fiscal Year		163
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	150
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		217
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	206	306
Total LHFI	404	738
Commercial LHFI [Member] | Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	179,592	263,298
Term Loans by Origination Year, Before Latest Fiscal Year	389,105	425,936
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	231,297	81,476
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	19,166	14,074
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		2,464
Financing Receivable, Revolving Loans	8,505	7,735
Total LHFI	827,665	794,983
Commercial LHFI [Member] | Other Loans Secured by Real Estate [Member] | Other Construction [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	178,219	262,544
Term Loans by Origination Year, Before Latest Fiscal Year	389,105	425,936
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	231,297	81,476
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	19,166	14,074
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		2,464
Financing Receivable, Revolving Loans	8,505	7,735
Total LHFI	826,292	794,229
Commercial LHFI [Member] | Other Loans Secured by Real Estate [Member] | Other Construction [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	1,373	754
Total LHFI	1,373	754
Consumer LHFI [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	379,359	424,960
Term Loans by Origination Year, Before Latest Fiscal Year	358,917	275,340
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	203,797	210,287
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	155,956	104,359
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	81,881	115,242
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	370,371	345,671
Financing Receivable, Revolving Loans	395,090	406,441
Total LHFI	1,945,371	1,882,300
Consumer LHFI [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	37,813	65,983
Term Loans by Origination Year, Before Latest Fiscal Year	41,037	25,465
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	15,387	13,266
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	8,127	3,925
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	2,328	1,266
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	909	348
Financing Receivable, Revolving Loans	50,474	54,133
Total LHFI	156,075	164,386
Consumer LHFI [Member] | Consumer Loans [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	37,466	65,370
Term Loans by Origination Year, Before Latest Fiscal Year	40,869	25,303
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	15,320	13,140
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	8,082	3,893
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	2,317	1,257
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	907	345
Financing Receivable, Revolving Loans	50,097	53,669
Total LHFI	155,058	162,977
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	327	524
Term Loans by Origination Year, Before Latest Fiscal Year	163	158
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	52	67
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	25	19
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1	7
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	1	3
Financing Receivable, Revolving Loans	279	305
Total LHFI	848	1,083
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	20	77
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	12	4
Financing Receivable, Revolving Loans	84	159
Total LHFI	116	240
Consumer LHFI [Member] | Consumer Loans [Member] | Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		12
Term Loans by Origination Year, Before Latest Fiscal Year	5	4
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	3	55
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	20	13
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	10	2
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	1
Financing Receivable, Revolving Loans	14
Total LHFI	53	86
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	17,103	47,336
Term Loans by Origination Year, Before Latest Fiscal Year	43,274	24,492
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	12,113	8,516
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	4,291	2,036
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1,092	1,448
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	3,379	2,979
Financing Receivable, Revolving Loans	451
Total LHFI	81,703	86,807
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	17,103	47,336
Term Loans by Origination Year, Before Latest Fiscal Year	43,274	24,174
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	11,951	8,496
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	4,272	2,036
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1,092	1,447
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	3,183	2,868
Financing Receivable, Revolving Loans	451
Total LHFI	81,326	86,357
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Past Due 30-89 Days [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Before Latest Fiscal Year		318
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	162	20
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	19
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		1
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	65	12
Total LHFI	246	351
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	131	99
Total LHFI	131	99
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	16,254	20,963
Term Loans by Origination Year, Before Latest Fiscal Year	13,937	10,309
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	7,883	12,158
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	7,437	4,618
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	4,142	2,082
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	10,698	11,669
Financing Receivable, Revolving Loans	344,165	352,308
Total LHFI	404,516	414,107
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	16,240	20,864
Term Loans by Origination Year, Before Latest Fiscal Year	13,834	10,253
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	7,724	12,037
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	7,426	4,177
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	3,730	2,082
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	10,239	11,124
Financing Receivable, Revolving Loans	341,240	348,830
Total LHFI	400,433	409,367
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Past Due 30-89 Days [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		93
Term Loans by Origination Year, Before Latest Fiscal Year	42	12
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	112
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		13
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	88	133
Financing Receivable, Revolving Loans	548	1,058
Total LHFI	790	1,309
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	32
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year		30
Financing Receivable, Revolving Loans	21	22
Total LHFI	53	52
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	14	6
Term Loans by Origination Year, Before Latest Fiscal Year	61	44
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	15	121
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	11	428
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	412
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	371	382
Financing Receivable, Revolving Loans	2,356	2,398
Total LHFI	3,240	3,379
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		107
Term Loans by Origination Year, Before Latest Fiscal Year	102
Term Loans by Origination Year, Two Years Before Latest Fiscal Year		38
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	9	37
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	34	96
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	231	200
Total LHFI	376	478
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		107
Term Loans by Origination Year, Before Latest Fiscal Year	102
Term Loans by Origination Year, Two Years Before Latest Fiscal Year		38
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	9	37
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	34	96
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	231	200
Total LHFI	376	478
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	35	109
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		4
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	3
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year		9
Total LHFI	38	122
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	35	109
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		4
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	3
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year		9
Total LHFI	38	122
Consumer LHFI [Member] | Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	308,154	290,462
Term Loans by Origination Year, Before Latest Fiscal Year	260,567	215,074
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	168,414	176,309
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	136,092	93,739
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	74,282	110,350
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	355,154	330,466
Total LHFI	1,302,663	1,216,400
Consumer LHFI [Member] | Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	308,154	289,521
Term Loans by Origination Year, Before Latest Fiscal Year	258,410	214,056
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	167,332	173,324
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	133,808	92,564
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	73,300	109,031
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	346,774	321,250
Total LHFI	1,287,778	1,199,746
Consumer LHFI [Member] | Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Past Due 30-89 Days [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		499
Term Loans by Origination Year, Before Latest Fiscal Year	701	93
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	186	753
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	174	366
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	121	1,080
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	1,229	799
Total LHFI	2,411	3,590
Consumer LHFI [Member] | Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		159
Term Loans by Origination Year, Before Latest Fiscal Year	253	214
Term Loans by Origination Year, Two Years Before Latest Fiscal Year		208
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		127
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	2	549
Total LHFI	255	1,257
Consumer LHFI [Member] | Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		283
Term Loans by Origination Year, Before Latest Fiscal Year	1,203	711
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	896	2,024
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	2,110	682
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	861	239
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	7,149	7,868
Total LHFI	$ 12,219	$ 11,807

Loans Held for Investment (L_13

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of Trustmark's Portfolio Segments, Loan Classes, Loan Pools and the ACL Methodology and Loss Drivers (Details)	6 Months Ended
	Jun. 30, 2021
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | 1 -4 Family Residential Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Prime Rate, National GDP
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Lots and Development [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Prime Rate, Southern Unemployment
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Unimproved Land [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Prime Rate, Southern Unemployment
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | All Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Unemployment
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | All Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Unemployment
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Consumer 1-4 Family - 1st Liens [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Prime Rate, Southern Unemployment
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Nonresidential Owner- Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Unemployment, National GDP
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Nonresidential Owner- Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Unemployment, National GDP
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Nonowner-Occupied - Hotel/Motel [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Vacancy Rate, Southern Unemployment
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Nonowner-Occupied - Office [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Vacancy Rate, Southern Unemployment
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Nonowner-Occupied- Retail [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Vacancy Rate, Southern Unemployment
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Nonowner-Occupied- Senior Living/ Nursing Homes [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Vacancy Rate, Southern Unemployment
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Nonowner-occupied - All Other [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Vacancy Rate, Southern Unemployment
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Nonresidential Owner- Occupied [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Unemployment, National GDP
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Nonowner-occupied - All Other [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Vacancy Rate, Southern Unemployment
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Nonresidential Nonowner- Occupied - Apartments [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Vacancy Rate, Southern Unemployment
Other Loans Secured by Real Estate [Member] | Other Construction [Member] | Other Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	WARM
Loss Drivers	Prime Rate, National Unemployment
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Trustmark Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	WARM
Loss Drivers	Southern Unemployment
Commercial and Industrial Loans [Member] | Commercial and Industrial Loans [Member] | Commercial and Industrial - Non-Working Capital [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Trustmark historical data
Commercial and Industrial Loans [Member] | Commercial and Industrial Loans [Member] | Commercial and Industrial - Working Capital [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Trustmark historical data
Commercial and Industrial Loans [Member] | Commercial and Industrial Loans [Member] | Credit Cards [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	WARM
Loss Drivers	Trustmark call report data
Consumer Loans [Member] | Consumer Loans [Member] | All Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Unemployment
Consumer Loans [Member] | Consumer Loans [Member] | Credit Cards [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	WARM
Loss Drivers	Trustmark call report data
Consumer Loans [Member] | Consumer Loans [Member] | Overdrafts [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	Loss Rate
Loss Drivers	Trustmark historical data
State and Other Political Subdivision Loans [Member] | State and Other Political Subdivision Loans [Member] | Obligations of State and Political Subdivisions [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Moody's Bond Default Study
Other Commercial Loans [Member] | Other Commercial Loans [Member] | Commercial and Industrial - Non-Working Capital [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Trustmark historical data
Other Commercial Loans [Member] | Other Commercial Loans [Member] | Commercial and Industrial - Working Capital [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Trustmark historical data
Other Commercial Loans [Member] | Other Commercial Loans [Member] | Other Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Prime Rate, Southern Unemployment

Loans Held for Investment (L_14

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of Balance in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total	$ 104,032		$ 117,306
Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	4,249		4,379
Collectively Evaluated for Credit Loss	99,783		112,927
Total	104,032	$ 109,191	117,306	$ 119,188	$ 100,564	$ 84,277
Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	32,878		43,409
Collectively Evaluated for Credit Loss	10,119,991		9,781,115
Total	10,152,869		9,824,524
Commercial and Industrial Loans [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	577		579
Collectively Evaluated for Credit Loss	13,396		14,272
Total	13,973	20,166	14,851	12,550	14,564	25,992
Commercial and Industrial Loans [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	4,474		14,076
Collectively Evaluated for Credit Loss	1,322,131		1,295,002
Total	1,326,605		1,309,078
Consumer Loans [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	4,876		5,838
Total	4,876	4,750	5,838	6,397	6,596	3,379
Consumer Loans [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	156,075		164,386
Total	156,075		164,386
State and Other Political Subdivision Loans [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	1,584		1,700
Collectively Evaluated for Credit Loss	1,649		1,490
Total	3,233	3,015	3,190	3,414	3,441	2,229
State and Other Political Subdivision Loans [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	3,854		3,970
Collectively Evaluated for Credit Loss	1,132,910		996,806
Total	1,136,764		1,000,776
Other Commercial Loans [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	2,088		2,100
Collectively Evaluated for Credit Loss	5,186		5,339
Total	7,274	6,450	7,439	6,452	6,020	5,303
Other Commercial Loans [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	5,451		5,615
Collectively Evaluated for Credit Loss	458,992		519,508
Total	464,443		525,123
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	5,110		6,854
Total	5,110	5,058	6,854	11,940	9,079	6,371
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	5,903		5,756
Collectively Evaluated for Credit Loss	526,734		508,300
Total	532,637		514,056
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	10,399		9,928
Total	10,399	8,667	9,928	12,716	11,711	5,888
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss			454
Collectively Evaluated for Credit Loss	507,733		524,278
Total	507,733		524,732
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	44,416		48,523
Total	44,416	46,438	48,523	36,417	28,127	26,158
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	11,763		12,037
Collectively Evaluated for Credit Loss	2,807,899		2,696,989
Total	2,819,662		2,709,026
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	5,311		7,382
Total	5,311	5,770	7,382	7,600	5,273	4,024
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	57		60
Collectively Evaluated for Credit Loss	1,078,565		1,065,904
Total	1,078,622		1,065,964
Other Loans Secured by Real Estate [Member] | Other Construction [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	6,530		8,158
Total	6,530	5,124	8,158	10,803	7,711	1,889
Other Loans Secured by Real Estate [Member] | Other Construction [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	827,665		794,983
Total	827,665		794,983
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	2,910		5,143
Total	2,910	$ 3,753	5,143	$ 10,899	$ 8,042	$ 3,044
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	1,376		1,441
Collectively Evaluated for Credit Loss	1,301,287		1,214,959
Total	$ 1,302,663		$ 1,216,400

Loans Held for Investment (L_15

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period			$ 117,306
PCL	$ (3,991)	$ 18,185	(14,492)	$ 38,766
Balance at end of period	104,032		104,032
Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	109,191	100,564	117,306	84,277
Loans charged-off	(4,828)	(1,870)	(6,073)	(7,415)
Recoveries	3,660	2,309	7,291	4,777
Net (charge-offs) recoveries	(1,168)	439	1,218	(2,638)
PCL	(3,991)	18,185	(14,492)	38,766
Balance at end of period	104,032	119,188	104,032	119,188
Allowance for Credit Losses, ACL [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,058	9,079	6,854	6,371
Loans charged-off		(7)		(7)
Recoveries	313	92	1,079	186
PCL	(261)	2,776	(2,823)	5,578
Balance at end of period	5,110	11,940	5,110	11,940
Allowance for Credit Losses, ACL [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	8,667	11,711	9,928	5,888
Loans charged-off	(58)	(36)	(84)	(100)
Recoveries	181	83	252	146
PCL	1,609	958	303	2,594
Balance at end of period	10,399	12,716	10,399	12,716
Allowance for Credit Losses, ACL [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
PCL	1,600
Allowance for Credit Losses, ACL [Member] | Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	3,753	8,042	5,143	3,044
Loans charged-off	(4)		(4)	(19)
Recoveries	8	13	108	106
PCL	(847)	2,844	(2,337)	4,877
Balance at end of period	2,910	10,899	2,910	10,899
Allowance for Credit Losses, ACL [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	46,438	28,127	48,523	26,158
Loans charged-off	(79)		(79)	(2,448)
Recoveries	1,027	445	1,057	506
PCL	(2,970)	7,845	(5,085)	20,380
Balance at end of period	44,416	36,417	44,416	36,417
Allowance for Credit Losses, ACL [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,770	5,273	7,382	4,024
Loans charged-off				(8)
Recoveries	5	12	11	18
PCL	(464)	2,315	(2,082)	4,331
Balance at end of period	5,311	7,600	5,311	7,600
Allowance for Credit Losses, ACL [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	20,166	14,564	14,851	25,992
Loans charged-off	(3,674)	(297)	(3,697)	(1,279)
Recoveries	652	191	1,939	733
PCL	(3,171)	(1,908)	880	(3,932)
Balance at end of period	13,973	12,550	13,973	12,550
Allowance for Credit Losses, ACL [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
PCL	1,400
Allowance for Credit Losses, ACL [Member] | Other Construction [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,124	7,711	8,158	1,889
Recoveries	43	21	44	40
PCL	1,363	3,071	(1,672)	5,672
Balance at end of period	6,530	10,803	6,530	10,803
Allowance for Credit Losses, ACL [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,750	6,596	5,838	3,379
Loans charged-off	(391)	(671)	(833)	(1,361)
Recoveries	387	468	749	941
PCL	130	4	(878)	1,379
Balance at end of period	4,876	6,397	4,876	6,397
Allowance for Credit Losses, ACL [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	3,015	3,441	3,190	2,229
PCL	218	(27)	43	(1,270)
Balance at end of period	3,233	3,414	3,233	3,414
Allowance for Credit Losses, ACL [Member] | Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	6,450	6,020	7,439	5,303
Loans charged-off	(622)	(859)	(1,376)	(2,193)
Recoveries	1,044	984	2,052	2,101
PCL	402	307	(841)	(843)
Balance at end of period	$ 7,274	$ 6,452	$ 7,274	6,452
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
LHFI				(3,039)
Allowance for loan losses, acquired loans transfer				815
Acquired loans ACL adjustment				1,007
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				(1,217)
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				(188)
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				4,188
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member] | Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				2,891
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				(8,179)
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				(765)
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member] | Commercial and Industrial Loans [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				(8,964)
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member] | Other Construction [Member] | Other Loans Secured by Real Estate [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				3,202
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member] | Consumer Loans [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				2,059
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member] | State and Other Political Subdivision Loans [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				2,455
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member] | Other Commercial Loans [Member] | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period				$ 2,084

Mortgage Banking - Schedule of

Mortgage Banking - Schedule of Activity in the Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Mortgage servicing rights [Abstract]
Balance at beginning of period	$ 66,464	$ 79,394
Origination of servicing assets	15,201	12,396
Change in fair value [Abstract]
Due to market changes	9,231	(27,158)
Due to run-off	(10,132)	(6,821)
Balance at end of period	$ 80,764	$ 57,811

Mortgage Banking - Additional I

Mortgage Banking - Additional Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)CPR	Jun. 30, 2020USD ($)CPR
Schedule of changes in the reserve for mortgage loan [Abstract]
Assumed average prepayment speed | CPR	12	17
Average discount rate (in hundredths)	9.54%	9.58%
Mortgage servicing rights [Abstract]
Residential mortgage loans sold	$ 1,289,000	$ 1,103,000
Gains on sales of residential mortgage loans	$ 34,200	48,400
Period of putback response	60 days
Reserve for mortgage loan servicing putback expenses	$ 500	$ 500

Mortgage Banking - Schedule o_2

Mortgage Banking - Schedule of Mortgage Loans Sold and Serviced for Others (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	$ 7,853,093	$ 7,657,090
Federal National Mortgage Association [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	4,718,042	4,629,670
Government National Mortgage Association [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	3,077,238	2,960,760
Federal Home Loan Mortgage Corporation [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	43,040	50,459
Other [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	$ 14,773	$ 16,201

Other Real Estate - Changes and

Other Real Estate - Changes and Gains (Losses), Net on Other Real Estate (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward
Balance at beginning of period	$ 11,651	$ 29,248
Additions	382	406
Disposals	(1,149)	(10,534)
Write-downs	(1,445)	(844)
Balance at end of period	9,439	18,276
Gains (losses), net on the sale of other real estate included in other real estate expense	$ 18	$ (255)

Other Real Estate - Other Real

Other Real Estate - Other Real Estate, By Type of Property (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Other real estate [Line Items]
Total other real estate	$ 9,439	$ 11,651	$ 18,276	$ 29,248
Construction, Land Development And Other Land Properties [Member]
Other real estate [Line Items]
Total other real estate	3,249	3,857
1 - 4 Family Residential Properties [Member]
Other real estate [Line Items]
Total other real estate	1,204	1,349
Nonfarm, Nonresidential Properties [Member]
Other real estate [Line Items]
Total other real estate	$ 4,986	$ 6,445

Other Real Estate - Other Rea_2

Other Real Estate - Other Real Estate, By Geographic Location (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Other Real Estate by Geographic Location [Line Items]
Total other real estate		$ 9,439	$ 11,651	$ 18,276	$ 29,248
Alabama [Member]
Other Real Estate by Geographic Location [Line Items]
Total other real estate		2,830	3,271
Mississippi [Member]
Other Real Estate by Geographic Location [Line Items]
Total other real estate	[1]	6,550	8,330
Tennessee [Member]
Other Real Estate by Geographic Location [Line Items]
Total other real estate	[2]	$ 59	$ 50
[1]	Mississippi includes Central and Southern Mississippi Regions.
[2]	Tennessee includes Memphis, Tennessee and Northern Mississippi Regions.

Other Real Estate - Additional

Other Real Estate - Additional information (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward
Foreclosed residential real estate properties recorded as a result of obtaining physical possession of property	$ 1,200	$ 1,300
Consumer mortgage loans and that formal foreclosure proceedings are in process	$ 1,400	$ 424

Leases - Components of Net Leas

Leases - Components of Net Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finance leases:
Amortization of right-of-use assets	$ 387	$ 481	$ 771	$ 978
Interest on lease liabilities	56	65	113	132
Operating lease cost	1,342	1,289	2,647	2,579
Short-term lease cost	110	111	229	220
Variable lease cost	311	332	618	679
Sublease income	(77)	(63)	(153)	(162)
Net lease cost	$ 2,129	$ 2,215	$ 4,225	$ 4,426

Leases - Cash Payments Included

Leases - Cash Payments Included in Measurement of Lease Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Finance leases:
Operating cash flows included in operating activities	$ 113	$ 132
Financing cash flows included in payments under finance lease obligations	712	905
Operating leases:
Operating cash flows (fixed payments) included in other operating activities, net	2,267	2,493
Operating cash flows (liability reduction) included in other operating activities, net	$ 1,954	$ 1,949

Leases - Balance Sheet Informat

Leases - Balance Sheet Information and Weighted-Average Lease Terms and Discount Rates Related to Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Leases [Abstract]
Finance lease right-of-use assets, net of accumulated depreciation	$ 6,792	$ 7,471
Finance lease liabilities	7,185	7,805
Operating lease right-of-use assets	33,201	30,901
Operating lease liabilities	$ 34,959	$ 32,290
Weighted-average lease term:
Finance leases	8 years 4 months 13 days	8 years 6 months 10 days
Operating leases	9 years 21 days	8 years 7 months 24 days
Weighted-average discount rate:
Finance leases	3.15%	3.10%
Operating leases	3.16%	3.41%

Leases - Future Minimum Rental

Leases - Future Minimum Rental Commitments Under Finance and Operating Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Leases [Abstract]
2021 (excluding the six months ended June 30, 2021)	$ 828
Finance leases, 2022	1,597
Finance leases, 2023	885
Finance leases, 2024	572
Finance leases, 2025	584
Thereafter	3,868
Finance leases, total minimum lease payments	8,334
Finance leases, imputed interest	(1,149)
Finance lease liabilities	7,185	$ 7,805
2021 (excluding the six months ended June 30, 2021)	2,525
Operating leases, 2022	4,864
Operating leases, 2023	4,670
Operating leases, 2024	4,713
Operating leases, 2025	4,752
Thereafter	18,743
Operating leases, total minimum lease payments	40,267
Operating leases, imputed interest	(5,308)
Operating lease liabilities	$ 34,959	$ 32,290

Deposits - Deposits Summary (De

Deposits - Deposits Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Deposits [Abstract]
Noninterest-bearing demand	$ 4,446,991	$ 4,349,010
Interest-bearing demand	4,208,521	3,646,246
Savings	4,694,346	4,647,610
Time	1,282,226	1,405,898
Total deposits	$ 14,632,084	$ 14,048,764

Securities Sold Under Repurch_3

Securities Sold Under Repurchase Agreement - Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Disclosure [Abstract]
Securities sold under repurchase agreements, secured by securities carrying amount	$ 179.6	$ 156.1

Securities Sold Under Repurch_4

Securities Sold Under Repurchase Agreements - Schedule of Securities Sold Under Repurchase Agreements (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements	$ 110,628	$ 128,053
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements	109,707	115,357
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements	$ 921	$ 12,696

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue From Contract With Customer [Abstract]
Other real estate sales, net gains (losses)	$ (41)	$ (185)	$ 18	$ (255)

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Summary of Noninterest Income Disaggregated by Reportable Operating Segment and Revenue Stream (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		$ 7,613	$ 6,397	$ 14,969	$ 16,429
Bank card and other fees		8,301	7,717	17,773	13,072
Mortgage banking, net		17,333	33,745	38,137	61,228
Insurance commissions		12,217	11,868	24,662	23,418
Wealth management		8,946	7,571	17,362	16,108
Other, net		2,001	2,213	4,091	4,520
Total Noninterest Income		56,411	69,511	116,994	134,775
Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		7,613	6,397	14,969	16,429
Bank card and other fees		8,529	6,557	15,721	13,289
Insurance commissions		12,217	11,868	24,662	23,418
Wealth management		8,946	7,571	17,362	16,108
Other, net		1,741	1,420	3,184	3,232
Total Noninterest Income		39,046	33,813	75,898	72,476
Not Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Bank card and other fees	[1]	(228)	1,160	2,052	(217)
Mortgage banking, net	[1]	17,333	33,745	38,137	61,228
Other, net	[1]	260	793	907	1,288
Total Noninterest Income	[1]	17,365	35,698	41,096	62,299
General Banking Segment [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		7,591	6,380	14,929	16,392
Bank card and other fees		8,291	7,709	17,755	13,058
Mortgage banking, net		17,333	33,745	38,137	61,228
Wealth management		2	79	20	165
Other, net		1,950	2,138	3,978	4,384
Total Noninterest Income		35,167	50,051	74,819	95,227
General Banking Segment [Member] | Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		7,591	6,380	14,929	16,392
Bank card and other fees		8,519	6,549	15,703	13,275
Wealth management		2	79	20	165
Other, net		1,699	1,354	3,087	3,118
Total Noninterest Income		17,811	14,362	33,739	32,950
General Banking Segment [Member] | Not Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Bank card and other fees	[1]	(228)	1,160	2,052	(217)
Mortgage banking, net	[1]	17,333	33,745	38,137	61,228
Other, net	[1]	251	784	891	1,266
Total Noninterest Income	[1]	17,356	35,689	41,080	62,277
Wealth Management Segment [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		22	17	40	37
Bank card and other fees		10	8	18	14
Wealth management		8,944	7,492	17,342	15,943
Other, net		44	33	83	72
Total Noninterest Income		9,020	7,550	17,483	16,066
Wealth Management Segment [Member] | Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		22	17	40	37
Bank card and other fees		10	8	18	14
Wealth management		8,944	7,492	17,342	15,943
Other, net		35	24	67	50
Total Noninterest Income		9,011	7,541	17,467	16,044
Wealth Management Segment [Member] | Not Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Other, net	[1]	9	9	16	22
Total Noninterest Income	[1]	9	9	16	22
Insurance Segment [Member]
Revenue From Contract With Customer [Line Items]
Insurance commissions		12,217	11,868	24,662	23,418
Other, net		7	42	30	64
Total Noninterest Income		12,224	11,910	24,692	23,482
Insurance Segment [Member] | Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Insurance commissions		12,217	11,868	24,662	23,418
Other, net		7	42	30	64
Total Noninterest Income		$ 12,224	$ 11,910	$ 24,692	$ 23,482
[1]	Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, accretion of the FDIC indemnification asset, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and security gains (losses), net .

Defined Benefit and Other Pos_3

Defined Benefit and Other Postretirement Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Trustmark Capital Accumulation Plan [Member] | Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions [Member]
Net periodic benefit cost [Abstract]
Service cost	$ 63	$ 63	$ 126	$ 127
Interest cost	43	61	86	121
Expected return on plan assets	(32)	(39)	(65)	(77)
Recognized net loss due to lump sum settlements	0	40	0	40
Recognized net actuarial loss	148	82	297	163
Net periodic benefit cost	222	207	444	374
Supplemental Retirement Plan [Member]
Net periodic benefit cost [Abstract]
Service cost	19	20	38	39
Interest cost	277	387	570	801
Amortization of prior service cost	28	38	56	75
Recognized net actuarial loss	295	236	601	482
Net periodic benefit cost	$ 619	$ 681	$ 1,265	$ 1,397

Defined Benefit and Other Pos_4

Defined Benefit and Other Postretirement Benefits - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021USD ($)
Trustmark Capital Accumulation Plan [Member] | Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Trustmark's minimum required contribution to the Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions	$ 324

Stock and Incentive Compensat_3

Stock and Incentive Compensation - Additional Information (Details)	6 Months Ended
	Jun. 30, 2021
Performance Based Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Return on average tangible equity, performance measure	100.00%
Total shareholder return, performance measure	100.00%
Time-Vested Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years

Stock and Incentive Compensat_4

Stock and Incentive Compensation - Summary of Stock Plan Activity (Details) - Stock and Incentive Compensation Plan [Member] - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Performance Based Award [Member]
Shares [Roll Forward]
Nonvested shares, beginning of period (in shares)	144,554	145,042
Granted (in shares)		53,273
Released from restriction (in shares)		(44,536)
Forfeited (in shares)	(2,585)	(11,810)
Nonvested shares, end of period (in shares)	141,969	141,969
Time-Vested Awards [Member]
Shares [Roll Forward]
Nonvested shares, beginning of period (in shares)	362,556	301,619
Granted (in shares)	2,750	176,022
Released from restriction (in shares)	(8,846)	(120,290)
Forfeited (in shares)	(4,405)	(5,296)
Nonvested shares, end of period (in shares)	352,055	352,055

Stock and Incentive Compensat_5

Stock and Incentive Compensation - Compensation Expense for Awards and Units Under Stock Plan (Details) - Stock and Incentive Compensation Plan [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Compensation expense [Abstract]
Recognized compensation expense	$ 1,214	$ 1,274	$ 3,395	$ 2,668
Performance Awards and Units [Member]
Compensation expense [Abstract]
Recognized compensation expense	324	456	206	(57)
Time-Vested Awards and Units [Member]
Compensation expense [Abstract]
Recognized compensation expense	$ 890	$ 818	$ 3,189	$ 2,725

Contingencies - Additional Info

Contingencies - Additional Information (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Loss Contingencies [Line Items]
Unused commitments to extend credit	$ 4,803	$ 4,391
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Potential exposure to credit loss in the event of nonperformance	$ 132.2	105.7
Letters of credit, maturity term - maximum	3 years
Collateral held, fair value	$ 40.2	$ 21.8

Contingencies - Summary of Chan

Contingencies - Summary of Changes in ACL on Off-balance Sheet Credit Exposures (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Commitments And Contingencies Disclosure [Abstract]
Balance at beginning of period		$ 29,205	$ 36,421	$ 38,572	$ 0
FASB ASU 2016-13 adoption adjustment		0	0	0	29,638
PCL, off-balance sheet credit exposures	[1]	4,528	6,242	(4,839)	13,025
Balance at end of period		$ 33,733	$ 42,663	$ 33,733	$ 42,663
[1]	During the second quarter of 2021, Trustmark reclassified its credit loss expense related to off-balance sheet credit exposures from noninterest expense to provision for credit losses, off-balance sheet credit exposures. Prior periods have been reclassified accordingly.

Earnings Per Share (EPS) - Weig

Earnings Per Share (EPS) - Weighted-Average Shares Used to Calculate Basic and Diluted EPS (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Basic shares	63,215	63,416	63,305	63,586
Dilutive shares	195	139	161	136
Diluted shares	63,410	63,555	63,466	63,722

Earnings Per Share (EPS) - We_2

Earnings Per Share (EPS) - Weighted-Average Antidilutive Stock Awards Excluded from Determining Diluted EPS (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Weighted-average antidilutive stock awards (in shares)	1	11	77	63

Statements of Cash Flows - Cash

Statements of Cash Flows - Cash Flows Supplementary Disclosures (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement of cash flows specific transaction amounts [Abstract]
Income taxes paid	$ 13,045	$ 23,309
Interest expense paid on deposits and borrowings	13,815	26,808
Noncash transfers from loans to other real estate	382	406
Finance right-of-use assets resulting from lease liabilities	92
Operating right-of-use assets resulting from lease liabilities	$ 4,278	$ 671

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2021	Mar. 31, 2020	Jun. 30, 2021	Mar. 31, 2020	Dec. 31, 2020	Apr. 01, 2020	Apr. 01, 2019
Stockholders Equity [Line items]
Capital conservation buffer rate	2.50%		2.50%		2.50%
Stock Repurchase Program 2 [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase							$ 100
Stock Repurchase Program 2 [Member] | Common Stock [Member]
Stockholders Equity [Line items]
Repurchase shares of common stock		887,000		1,500,000
Repurchase shares of common stock, value		$ 27.5		$ 47.2
Stock Repurchase Program 3 [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase						$ 100
Stock Repurchase Program 3 [Member] | Common Stock [Member]
Stockholders Equity [Line items]
Repurchase shares of common stock	630,000		775,000
Repurchase shares of common stock, value	$ 20.8		$ 25

Shareholders' Equity - Table of

Shareholders' Equity - Table of Actual Regulatory Capital Amounts and Ratios (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Trustmark Corporation [Member] | Common Equity Tier 1 Capital (to Risk Weighted Assets) [Member]
Common Equity Tier One Risk Based Capital [Abstract]
Actual Regulatory Capital Amount		$ 1,441,102	$ 1,395,844
Actual Regulatory Capital Ratio		11.76%	11.62%
Minimum Regulatory Capital Required Ratio		7.00%	7.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio	[1]
Trustmark Corporation [Member] | Tier 1 Capital (to Risk Weighted Assets) [Member]
Tier 1 Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,501,102	$ 1,455,844
Actual Regulatory Capital Ratio		12.25	12.11
Minimum Regulatory Capital Required Ratio		8.50	8.50
Minimum Regulatory Provision to be Well-Capitalized Ratio	[1]
Trustmark Corporation [Member] | Total Capital (to Risk Weighted Assets) [Member]
Total Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,728,478	$ 1,696,794
Actual Regulatory Capital Ratio		14.10	14.12
Minimum Regulatory Capital Required Ratio		10.50	10.50
Minimum Regulatory Provision to be Well-Capitalized Ratio	[1]
Trustmark Corporation [Member] | Tier 1 Leverage (to Average Assets) [Member]
Tier 1 Leverage (to Average Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,501,102	$ 1,455,844
Actual Regulatory Capital Ratio		9	9.33
Minimum Regulatory Capital Required Ratio		4	4
Minimum Regulatory Provision to be Well-Capitalized Ratio	[1]
Trustmark National Bank [Member] | Common Equity Tier 1 Capital (to Risk Weighted Assets) [Member]
Common Equity Tier One Risk Based Capital [Abstract]
Actual Regulatory Capital Amount		$ 1,491,066	$ 1,412,015
Actual Regulatory Capital Ratio		12.17%	11.75%
Minimum Regulatory Capital Required Ratio		7.00%	7.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio		6.50%	6.50%
Trustmark National Bank [Member] | Tier 1 Capital (to Risk Weighted Assets) [Member]
Tier 1 Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,491,066	$ 1,412,015
Actual Regulatory Capital Ratio		12.17	11.75
Minimum Regulatory Capital Required Ratio		8.50	8.50
Minimum Regulatory Provision to be Well-Capitalized Ratio		8	8
Trustmark National Bank [Member] | Total Capital (to Risk Weighted Assets) [Member]
Total Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,595,510	$ 1,530,044
Actual Regulatory Capital Ratio		13.02	12.73
Minimum Regulatory Capital Required Ratio		10.50	10.50
Minimum Regulatory Provision to be Well-Capitalized Ratio		10	10
Trustmark National Bank [Member] | Tier 1 Leverage (to Average Assets) [Member]
Tier 1 Leverage (to Average Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,491,066	$ 1,412,015
Actual Regulatory Capital Ratio		8.96	9.07
Minimum Regulatory Capital Required Ratio		4	4
Minimum Regulatory Provision to be Well-Capitalized Ratio		5	5
[1]	n/a

Shareholders' Equity - Net Chan

Shareholders' Equity - Net Change in Components of Accumulated Other Comprehensive Income (Loss) and the Related Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax amount	$ 7,819	$ 3,822	$ (12,787)	$ 45,554
Other comprehensive income (loss), tax (expense) benefit	(1,954)	(955)	3,197	(11,389)
Other comprehensive income (loss), before reclassifications, net of tax amount			(10,306)	33,595
Reclassification from accumulated other comprehensive income, current period, net of tax amount			716	570
Other comprehensive income (loss), net of tax amount	5,865	2,867	(9,590)	34,165
Securities Available for Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, before tax amount	6,612	2,648	(15,188)	43,155
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, before tax amount	736	778	1,447	1,639
Other comprehensive income (loss), before tax amount	7,348	3,426	(13,741)	44,794
Other comprehensive income (loss), before reclassifications, tax (expense) benefit	(1,653)	(662)	3,797	(10,789)
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, tax (expense) benefit	(184)	(195)	(362)	(410)
Other comprehensive income (loss), tax (expense) benefit	(1,837)	(857)	3,435	(11,199)
Other comprehensive income (loss), before reclassifications, net of tax amount	4,959	1,986	(11,391)	32,366
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, net of tax amount	552	583	1,085	1,229
Other comprehensive income (loss), net of tax amount	5,511	2,569	(10,306)	33,595
Net Change in Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax amount	28	38	56	75
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(7)	(10)	(14)	(19)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	21	28	42	56
Recognized Net Loss Due to Lump Sum Settlements [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax amount	0	40	0	40
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	0	(10)	0	(10)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	0	30	0	30
Change in Net Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax amount	443	318	898	645
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(110)	(78)	(224)	(161)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	333	240	674	484
Pension and Other Postretirement Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax amount	471	396	954	760
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(117)	(98)	(238)	(190)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	$ 354	$ 298	$ 716	$ 570

Shareholders' Equity - Changes

Shareholders' Equity - Changes in Balances of Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 1,759,705	$ 1,652,399	$ 1,741,117	$ 1,660,702
Other comprehensive income (loss) before reclassification			(10,306)	33,595
Amounts reclassified from accumulated other comprehensive income (loss)			716	570
Other comprehensive income (loss), net of tax amount	5,865	2,867	(9,590)	34,165
Balance	1,779,309	1,673,944	1,779,309	1,673,944
Securities Available for Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			17,331	(8,017)
Other comprehensive income (loss) before reclassification			(10,306)	33,595
Other comprehensive income (loss), net of tax amount			(10,306)	33,595
Balance	7,025	25,578	7,025	25,578
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(18,382)	(15,583)
Amounts reclassified from accumulated other comprehensive income (loss)			716	570
Other comprehensive income (loss), net of tax amount			716	570
Balance	(17,666)	(15,013)	(17,666)	(15,013)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(16,506)	7,698	(1,051)	(23,600)
Balance	$ (10,641)	$ 10,565	$ (10,641)	$ 10,565

Fair Value - Financial Assets a

Fair Value - Financial Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 2,548,739	$ 1,991,815
Loans held for sale	332,132	446,951
Mortgage servicing rights	80,764	66,464	$ 57,811	$ 79,394
U.S. Government Agency Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	16,023	18,041
Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	5,807	5,835
Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,548,739	1,991,815
Loans held for sale	332,132	446,951
Mortgage servicing rights	80,764	66,464
Other assets - derivatives	32,172	47,768
Other liabilities - derivatives	3,532	5,324
Recurring Basis [Member] | U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	30,025
Recurring Basis [Member] | U.S. Government Agency Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	16,023	18,041
Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	5,807	5,835
Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,496,884	1,967,939
Level 1 [Member] | Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	30,025	0
Loans held for sale	0	0
Mortgage servicing rights	0	0
Other assets - derivatives	1,981	145
Other liabilities - derivatives	233	666
Level 1 [Member] | Recurring Basis [Member] | U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	30,025
Level 1 [Member] | Recurring Basis [Member] | U.S. Government Agency Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Level 1 [Member] | Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Level 1 [Member] | Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Level 2 [Member] | Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,518,714	1,991,815
Loans held for sale	332,132	446,951
Mortgage servicing rights	0	0
Other assets - derivatives	26,306	38,063
Other liabilities - derivatives	3,299	4,658
Level 2 [Member] | Recurring Basis [Member] | U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Level 2 [Member] | Recurring Basis [Member] | U.S. Government Agency Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	16,023	18,041
Level 2 [Member] | Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	5,807	5,835
Level 2 [Member] | Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,496,884	1,967,939
Level 3 [Member] | Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Loans held for sale	0	0
Mortgage servicing rights	80,764	66,464
Other assets - derivatives	3,885	9,560
Other liabilities - derivatives	0	0
Level 3 [Member] | Recurring Basis [Member] | U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Level 3 [Member] | Recurring Basis [Member] | U.S. Government Agency Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Level 3 [Member] | Recurring Basis [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0	0
Level 3 [Member] | Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 0	$ 0

Fair Value - Changes in Level 3

Fair Value - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - Recurring Basis [Member] - Level 3 [Member] - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
MSR [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ 66,464	$ 79,394
Total net (loss) gain included in Mortgage banking, net	[1]	(901)	(33,979)
Additions		15,201	12,396
Sales		0	0
Ending Balance		80,764	57,811
The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held, end of period		9,231	(27,158)
Other Assets - Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		9,560	1,439
Total net (loss) gain included in Mortgage banking, net	[1]	5,857	22,382
Additions		0	0
Sales		(11,532)	(9,491)
Ending Balance		3,885	14,330
The amount of total gains (losses) for the period included in earnings that are attributable to the change in unrealized gains or losses still held, end of period		$ 2,592	$ 12,897
[1]	Total net (loss) gain included in Mortgage banking, net relating to the MSR includes changes in fair value due to market changes and due to run-off.

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Outstanding balances in collateral dependent related to allowance for credit losses	$ 32,900		$ 32,900		$ 43,400
Collateral dependent related to allowance for credit losses	4,200		4,200		4,400
Foreclosed assets remeasured after initial recognition			5,300	$ 3,200
Write-downs of allowance for foreclosed assets after initial recognition			268	873
Noninterest gain (loss) Mortgage banking, net for changes in fair value of LHFS	2,300	$ (445)	(8,300)	7,300
Interest earned on LHFS included in Interest and fees on LHFS and LHFI	1,700	$ 1,500	3,800	$ 2,800
Serviced GNMA loans eligible for repurchase	$ 95,400		$ 95,400		$ 141,200

Fair Value - Carrying Amounts a

Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity	$ 433,012	$ 538,072
Deposits	14,632,084	14,048,764
Federal funds purchased and securities sold under repurchase agreements	157,176	164,519
Other borrowings	117,223	168,252
Subordinated notes	122,932	122,921
Junior subordinated debt securities	61,856	61,856
Level 2 [Member] | Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and short-term investments	2,267,224	1,952,554
Securities held to maturity	433,012	538,072
Deposits	14,632,084	14,048,764
Federal funds purchased and securities sold under repurchase agreements	157,176	164,519
Other borrowings	117,223	168,252
Subordinated notes	122,932	122,921
Junior subordinated debt securities	61,856	61,856
Level 2 [Member] | Estimate Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and short-term investments	2,267,224	1,952,554
Securities held to maturity	452,288	563,115
Deposits	14,633,322	14,052,863
Federal funds purchased and securities sold under repurchase agreements	157,176	164,519
Other borrowings	117,221	168,252
Subordinated notes	128,750	127,500
Junior subordinated debt securities	48,866	46,083
Level 3 [Member] | Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI and PPP loans	10,214,956	10,317,352
Level 3 [Member] | Estimate Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI and PPP loans	$ 10,183,509	$ 10,312,395

Fair Value - Fair Value and the

Fair Value - Fair Value and the Contractual Principal Outstanding of the LHFS (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair value and the contractual principal outstanding of the LHFS [Abstract]
Fair value of LHFS	$ 236,719	$ 305,791
LHFS contractual principal outstanding	229,631	290,625
Fair value less unpaid principal	$ 7,088	$ 15,166

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Details) - Derivatives not Designated as Hedging Instruments [Member]	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021USD ($)Contract	Jun. 30, 2020USD ($)	Jun. 30, 2021USD ($)Contract	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)Contract
Beneficiary [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of risk participation agreements | Contract	6		6		3
Aggregate notional amount of credit risk participation agreements	$ 50,300,000		$ 50,300,000		$ 41,100,000
Guarantor [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of risk participation agreements | Contract	24		24		24
Aggregate notional amount of credit risk participation agreements	$ 174,200,000		$ 174,200,000		$ 172,000,000
Forward Contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	317,500,000		317,500,000		377,500,000
Valuation adjustment			(587,000)		(3,100,000)
Interest Rate Lock Commitments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	238,800,000		238,800,000		329,300,000
Valuation adjustment			3,900,000		9,600,000
Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	1,115,000,000		1,115,000,000		1,125,000,000
Termination value of derivatives	950,000		950,000		1,300,000
Collateral Posted	1,100,000		1,100,000
Mortgage Servicing Rights Hedge [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	374,500,000		374,500,000		$ 326,500,000
Net (negative) positive ineffectiveness on MSR fair value	$ 1,300,000	$ (2,000,000)	$ 1,500,000	$ 7,900,000

Derivative Financial Instrume_4

Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset		$ 26,168	$ 37,974
Fair value of derivative liability		2,569	1,313
Derivatives not Designated as Hedging Instruments [Member] | Credit Risk Participation Agreement [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset		138	89
Derivatives not Designated as Hedging Instruments [Member] | Credit Risk Participation Agreement [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability		143	200
Derivatives not Designated as Hedging Instruments [Member] | Future Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability			34
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability		587	3,145
Derivatives not Designated as Hedging Instruments [Member] | Futures Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset		1,485
Derivatives not Designated as Hedging Instruments [Member] | Exchange Traded Purchased Options [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset		496	145
Derivatives not Designated as Hedging Instruments [Member] | OTC Written Options (Rate Locks) [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset		3,885	9,560
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	[1]	26,168	37,974
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	[1]	2,569	1,313
Derivatives not Designated as Hedging Instruments [Member] | Exchange Traded Written Options [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability		$ 233	$ 632
[1]	In accordance with GAAP, the variation margin collateral payments made or received for interest rate swaps that are centrally cleared are legally characterized as settled. As a result, the centrally cleared interest rate swaps included in other assets and other liabilities are presented on a net basis in the accompanying consolidated balance sheets.

Derivative Financial Instrume_5

Derivative Financial Instruments - Effects of Derivative Instruments on Statements of Operations (Details) - Derivatives not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Mortgage Banking, Net [Member]
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in mortgage banking, net	$ (1,614)	$ 12,395	$ (10,812)	$ 45,881
Bank Card and Other Fees [Member]
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in bank card and other fees	$ (667)	$ (76)	$ 935	$ (1,736)

Derivative Financial Instrume_6

Derivative Financial Instruments - Information about Financial Instruments that are Eligible for Offset in the Consolidated Balance Sheets (Details) - Interest Rate Swap [Member] - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Offsetting Derivative Assets
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets	$ 26,168	$ 37,974
Gross Amounts Offset in the Statement of Financial Position, Offsetting of Derivative Assets	0	0
Net Amounts of Assets presented in the Statement of Financial Position, Offsetting of Derivative Assets	26,168	37,974
Financial Instruments, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Assets	(14)	0
Cash Collateral Received, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Assets	0	0
Net Amount, Offsetting of Derivative Assets	26,154	37,974
Offsetting Derivative Liabilities
Gross Amounts of Recognized Liabilities, Offsetting of Derivative Liabilities	2,569	1,313
Gross Amounts Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities	0	0
Net Amounts of Liabilities presented in the Statement of Financial Position, Offsetting of Derivative Liabilities	2,569	1,313
Financial Instruments, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities	(14)	0
Cash Collateral Posted, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities	(1,100)	$ (1,313)
Net Amount, Offsetting of Derivative Liabilities	$ 1,455

Segment Information - Additiona

Segment Information - Additional Information (Details)	6 Months Ended
	Jun. 30, 2021Segment
Segment Reporting [Abstract]
Number of segments in which the business operates	3

Segment Information - Schedule

Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net interest income		$ 119,423		$ 105,000		$ 221,759	$ 208,952
Provision for credit losses	[1]	537		24,427		(19,331)	51,791
Noninterest income		56,411		69,511		116,994	134,775
Noninterest expense	[1]	118,679		112,417		240,227	229,444
Income Before Income Taxes		56,618		37,667		117,857	62,492
Income taxes		8,637		5,517		17,914	8,124
Net Income		47,981	$ 51,962	32,150	$ 22,218	99,943	54,368
Selected Financial Information
Total assets		17,098,132		15,692,079		17,098,132	15,692,079	$ 16,551,840
Depreciation and amortization		11,302		10,660		22,428	19,656
General Banking [Member]
Segment Reporting Information [Line Items]
Net interest income		118,169		103,376		219,277	205,779
Provision for credit losses	[1]	540		24,430		(19,326)	49,587
Noninterest income		35,167		50,051		74,819	95,227
Noninterest expense	[1]	102,199		97,113		206,163	196,780
Income Before Income Taxes		50,597		31,884		107,259	54,639
Income taxes		7,137		4,093		15,260	6,184
Net Income		43,460		27,791		91,999	48,455
Selected Financial Information
Total assets		16,716,574		15,378,653		16,716,574	15,378,653
Depreciation and amortization		11,046		10,422		21,910	19,216
Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest income		1,256		1,576		2,487	3,080
Provision for credit losses		(3)		(3)		(5)	2,204
Noninterest income		9,020		7,550		17,483	16,066
Noninterest expense		7,749		6,944		15,943	15,460
Income Before Income Taxes		2,530		2,185		4,032	1,482
Income taxes		633		547		1,009	371
Net Income		1,897		1,638		3,023	1,111
Selected Financial Information
Total assets		299,275		232,467		299,275	232,467
Depreciation and amortization		66		67		134	134
Insurance [Member]
Segment Reporting Information [Line Items]
Net interest income		(2)		48		(5)	93
Noninterest income		12,224		11,910		24,692	23,482
Noninterest expense		8,731		8,360		18,121	17,204
Income Before Income Taxes		3,491		3,598		6,566	6,371
Income taxes		867		877		1,645	1,569
Net Income		2,624		2,721		4,921	4,802
Selected Financial Information
Total assets		82,283		80,959		82,283	80,959
Depreciation and amortization		$ 190		$ 171		$ 384	$ 306
[1]	During the second quarter of 2021, Trustmark reclassified its credit loss expense related to off-balance sheet credit exposures from noninterest expense to provision for credit losses, off-balance sheet credit exposures. Prior periods have been reclassified accordingly

Accounting Policies Recently _3

Accounting Policies Recently Adopted and Pending Accounting Pronouncements - Additional Information (Details)	Jun. 30, 2021
ASU 2019-12 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adoption date	Jan. 1, 2021
Change in accounting principle, accounting standards update, adopted [true false]	true
Change in accounting principle, accounting standards update, immaterial effect [true false]	true
ASU 2018-14 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adoption date	Jan. 1, 2021
Change in accounting principle, accounting standards update, adopted [true false]	true
Change in accounting principle, accounting standards update, immaterial effect [true false]	true