Trustmark (TRMK) 10-K 15 Feb 24 2023 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Jan. 31, 2024	Jun. 30, 2023
Cover [Abstract]
Entity Registrant Name	TRUSTMARK CORP
Entity Central Index Key	0000036146
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2023
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 File Number	000-3683
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 Annual Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Public Float			$ 698.8
Entity Common Stock, Shares Outstanding		61,084,299
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the Proxy Statement for Trustmark’s 2024 Annual Meeting of Shareholders to be held April 23, 2024 are incorporated by reference into Part III of the Form 10-K report.
Auditor Name	Crowe LLP
Auditor Location	Fort Lauderdale, Florida
Auditor Firm ID	173

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 975,543	$ 734,787
Federal funds sold and securities purchased under reverse repurchase agreements	0	4,000
Securities available for sale, at fair value (amortized cost: $1,959,007-2023; $2,270,709-2022; allowance for credit losses (ACL): $0)	1,762,878	2,024,082
Securities held to maturity, net of ACL of $0 (fair value: $1,355,504-2023; $1,406,589-2022)	1,426,279	1,494,514
Loans held for sale (LHFS)	184,812	135,226
Loans held for investment (LHFI)	12,950,524	12,204,039
Less ACL, LHFI	139,367	120,214
Net LHFI	12,811,157	12,083,825
Premises and equipment, net	232,537	212,365
Mortgage servicing rights (MSR)	131,870	129,677
Goodwill	384,237	384,237
Identifiable intangible assets, net	2,965	3,640
Other real estate, net	6,867	1,986
Operating lease right-of-use assets	38,142	36,301
Other assets	764,902	770,838
Total Assets	18,722,189	18,015,478
Deposits:
Noninterest-bearing	3,197,620	4,093,771
Interest-bearing	12,372,143	10,343,877
Total deposits	15,569,763	14,437,648
Federal funds purchased and securities sold under repurchase agreements	405,745	449,331
Other borrowings	483,230	1,050,938
Subordinated notes	123,482	123,262
Junior subordinated debt securities	61,856	61,856
ACL on off-balance sheet credit exposures	34,057	36,838
Operating lease liabilities	41,584	38,932
Other liabilities	340,625	324,405
Total Liabilities	17,060,342	16,523,210
Shareholders' Equity
Common stock, no par value: Authorized: 250,000,000 shares Issued and outstanding: 61,071,173 shares - 2023; 60,977,686 shares - 2022	12,725	12,705
Capital surplus	159,688	154,645
Retained earnings	1,709,157	1,600,321
Accumulated other comprehensive income (loss), net of tax	(219,723)	(275,403)
Total Shareholders' Equity	1,661,847	1,492,268
Total Liabilities and Shareholders' Equity	$ 18,722,189	$ 18,015,478

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Assets
Securities available-for-sale, amortized cost	$ 1,959,007,000	$ 2,270,709,000
Securities available-for-sale, allowance for credit Losses (ACL)	0	0
Securities held to maturity, net of ACL	0	0
Securities held to maturity, fair value	$ 1,355,504,000	$ 1,406,589,000
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)	61,071,173	60,977,686
Common stock, outstanding (in shares)	61,071,173	60,977,686

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest Income
Interest and fees on LHFS & LHFI		$ 775,309	$ 472,990	$ 363,772
Interest and fees on PPP loans		0	639	36,726
Interest on securities:
Taxable		66,100	59,717	38,698
Tax exempt		208	333	548
Interest on federal funds sold and securities purchased under reverse repurchase agreements		80	74	0
Other interest income		37,135	8,080	2,767
Total Interest Income		878,832	541,833	442,511
Interest Expense
Interest on deposits		245,951	29,069	16,945
Interest on federal funds purchased and securities sold under repurchase agreements		20,419	6,127	232
Other interest expense		59,584	11,929	6,983
Total Interest Expense		325,954	47,125	24,160
Net Interest Income		552,878	494,708	418,351
Provision for credit losses (PCL), LHFI		27,362	21,677	(21,499)
PCL, off-balance sheet credit exposures		(2,781)	1,215	(2,949)
Net Interest Income After PCL		528,297	471,816	442,799
Noninterest Income
Service charges on deposit accounts		43,416	42,157	33,246
Bank card and other fees		33,439	36,105	34,662
Mortgage banking, net		26,216	28,306	63,750
Insurance commissions		57,569	53,721	48,511
Wealth management		35,092	35,013	35,190
Other, net		11,187	9,842	6,551
Securities (gains) losses, net		39	0	0
Total Noninterest Income		206,958	205,144	221,910
Noninterest Expense
Salaries and employee benefits		304,665	287,440	284,158
Services and fees	[1]	109,478	105,469	92,282
Net occupancy - premises		29,482	29,264	27,043
Equipment expense		26,142	24,448	24,337
Litigation settlement expense		6,500	100,750	0
Other expense	[1],[2]	61,652	55,842	61,476
Total Noninterest Expense		537,919	603,213	489,296
Income Before Income Taxes		197,336	73,747	175,413
Income taxes		31,847	1,860	28,048
Net Income		$ 165,489	$ 71,887	$ 147,365
Earnings Per Share
Basic		$ 2.71	$ 1.17	$ 2.35
Diluted		$ 2.7	$ 1.17	$ 2.34
[1] During the first quarter of 2023, Trustmark reclassified its debit card transaction fees from other expense to services and fees. The prior periods have been reclassified accordingly. During the first quarter of 2022, Trustmark reclassified its other real estate expense, net to other expense. The prior periods have been reclassified accordingly .

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income per consolidated statements of income	$ 165,489	$ 71,887	$ 147,365
Net unrealized gains (losses) on available for sale securities and transferred securities:
Net unrealized holding gains (losses) arising during the period	38,133	(172,143)	(37,090)
Reclassification adjustment for net (gains) losses realized in net income	(29)	0	0
Change in net unrealized holding loss on securities transferred to held to maturity	11,668	(64,525)	1,985
Pension and other postretirement benefit plans:
Change in the actuarial loss of pension and other postretirement benefit plans	(518)	8,094	2,134
Reclassification adjustments for changes realized in net income:
Net change in prior service costs	83	83	84
Recognized net loss due to lump sum settlements	19	0	137
Change in net actuarial loss	133	817	1,241
Derivatives:
Change in the accumulated gain (loss) on effective cash flow hedge derivatives	(6,098)	(15,514)	0
Reclassification adjustment for (gain) loss realized in net income	12,289	345	0
Other comprehensive income (loss), net of tax	55,680	(242,843)	(31,509)
Comprehensive income (loss)	$ 221,169	$ (170,956)	$ 115,856

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
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
Net income per consolidated statements of income	147,365			147,365
Other comprehensive income (loss), net of tax	(31,509)				(31,509)
Cash dividends paid on common stock ($0.92 per share)	(58,085)			(58,085)
Shares withheld to pay taxes, long-term incentive plan	(1,379)	$ 28	(1,407)
Shares withheld to pay taxes, long-term incentive plan (in shares)		133,907
Repurchase and retirement of common stock	(61,799)	$ (398)	(61,401)
Repurchase and retirement of common stock (in shares)		(1,909,754)
Compensation expense, long-term incentive plan	5,601		5,601
Balance at Dec. 31, 2021	1,741,311	$ 12,845	175,913	1,585,113	(32,560)
Balance (in shares) at Dec. 31, 2021		61,648,679
Net income per consolidated statements of income	71,887			71,887
Other comprehensive income (loss), net of tax	(242,843)				(242,843)
Cash dividends paid on common stock ($0.92 per share)	(56,679)			(56,679)
Shares withheld to pay taxes, long-term incentive plan	(1,687)	$ 24	(1,711)
Shares withheld to pay taxes, long-term incentive plan (in shares)		118,398
Repurchase and retirement of common stock	(24,604)	$ (164)	(24,440)
Repurchase and retirement of common stock (in shares)		(789,391)
Compensation expense, long-term incentive plan	4,883		4,883
Balance at Dec. 31, 2022	$ 1,492,268	$ 12,705	154,645	1,600,321	(275,403)
Balance (in shares) at Dec. 31, 2022	60,977,686	60,977,686
Net income per consolidated statements of income	$ 165,489			165,489
Other comprehensive income (loss), net of tax	55,680				55,680
Cash dividends paid on common stock ($0.92 per share)	(56,653)			(56,653)
Shares withheld to pay taxes, long-term incentive plan	(1,092)	$ 20	(1,112)
Shares withheld to pay taxes, long-term incentive plan (in shares)		93,487
Compensation expense, long-term incentive plan	6,155		6,155
Balance at Dec. 31, 2023	$ 1,661,847	$ 12,725	$ 159,688	$ 1,709,157	$ (219,723)
Balance (in shares) at Dec. 31, 2023	61,071,173	61,071,173

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Cash dividends paid on common stock (in dollars per share)	$ 0.92	$ 0.92	$ 0.92

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities
Net income per consolidated statements of income	$ 165,489	$ 71,887	$ 147,365
Adjustments to reconcile net income to net cash provided by operating activities:
PCL	24,581	22,892	(24,448)
Depreciation and amortization	35,756	39,882	45,813
Net amortization of securities	6,140	11,206	20,310
Securities (gains) losses, net	(39)	0	0
Gains on sales of loans, net	(13,599)	(24,914)	(70,954)
Compensation expense, long-term incentive plan	6,155	4,883	5,601
Deferred income tax provision	(4,800)	(16,800)	20,115
Proceeds from sales of LHFS	1,149,609	1,267,967	2,357,108
Purchases and originations of LHFS	(1,177,563)	(1,116,232)	(2,171,605)
Originations of MSR	(13,712)	(17,843)	(28,125)
Earnings on bank-owned life insurance	(5,244)	(4,875)	(4,853)
Net change in other assets	(11,454)	(51,921)	42,400
Net change in other liabilities	34,376	167,743	19,645
Other operating activities, net	1,192	(57,359)	(9,601)
Net cash from operating activities	196,887	296,516	348,771
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity	103,051	136,135	197,091
Proceeds from maturities, prepayments and calls of securities available for sale	301,344	435,386	835,200
Proceeds from sales of securities available for sale	4,796	0	0
Purchases of securities held to maturity	(19,491)	(604,938)	0
Purchases of securities available for sale	0	(230,527)	(2,150,935)
Net proceeds from bank-owned life insurance	(46)	288	1,772
Net change in federal funds sold and securities purchased under reverse repurchase agreements	4,000	(4,000)	50
Net change in member bank stock	17,830	(39,329)	(1,220)
Net change in LHFI and PPP loans	(761,931)	(1,925,327)	(197,800)
Proceeds from sales of PPP loans	0	0	353,287
Purchases of premises and equipment	(40,082)	(26,624)	(27,360)
Proceeds from sales of premises and equipment	1,863	5,107	961
Proceeds from sales of other real estate	2,410	3,136	5,064
Purchases of software	(8,575)	(7,388)	(3,836)
Investments in tax credit and other partnerships	(16,343)	(22,321)	(17,288)
Net cash from investing activities	(411,174)	(2,280,402)	(1,005,014)
Financing Activities
Net change in deposits	1,132,115	(649,512)	1,038,396
Net change in federal funds purchased and securities sold under repurchase agreements	(43,586)	210,754	74,058
Net change in other borrowings	(575,020)	974,981	(19,189)
Payments under finance lease obligations	(721)	(1,409)	(1,434)
Common stock dividends	(56,653)	(56,679)	(58,085)
Repurchase and retirement of common stock	0	(24,604)	(61,799)
Shares withheld to pay taxes, long-term incentive plan	(1,092)	(1,687)	(1,379)
Net cash from financing activities	455,043	451,844	970,568
Net change in cash and cash equivalents	240,756	(1,532,042)	314,325
Cash and cash equivalents at beginning of year	734,787	2,266,829	1,952,504
Cash and cash equivalents at end of year	$ 975,543	$ 734,787	$ 2,266,829

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Significant Accounting Policies	Note 1 – Significant Accounting Policies Business 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 offices in Alabama (includes the Georgia Loan Production Office), Florida, Mississippi, Tennessee and Texas. Basis of Financial Statement Presentation 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 consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (GAAP). 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 2024 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. Securities Securities are classified as either held to maturity or available for sale. Securities are classified as held to maturity and carried at amortized cost when Management has the positive intent and the ability to hold them until maturity. Securities to be held for indefinite periods of time are classified as available for sale and carried at fair value, with the unrealized holding gains and losses reported as a component of other comprehensive income (loss), net of tax. Securities available for sale are used as part of Trustmark’s interest rate risk management strategy and may be sold in response to changes in interest rates, changes in prepayment rates and other factors. Management determines the appropriate classification of securities at the time of purchase. The amortized cost of debt securities classified as securities held to maturity or securities available for sale is adjusted for amortization of premiums and accretion of discounts to maturity of the security using the interest method. Such amortization or accretion is included in interest on securities. Realized gains and losses are determined using the specific identification method and are included in noninterest income as securities gains (losses), net. Securities transferred from the available for sale category to the held to maturity category are recorded at fair value at the date of transfer. Unrealized holding gains or losses associated with the transfer of securities from available for sale to held to maturity are included in the balance of accumulated other comprehensive income (loss), net of tax, in the consolidated balance sheets. These unrealized holding gains or losses are amortized over the remaining life of the security as a yield adjustment in a manner consistent with the amortization or accretion of the original purchase premium or discount on the associated security. Allowance for Credit Losses (ACL) Financial Accounting Standards Board (FASB) Accounting Standard Codification (ASC) Topic 326 requires a current expected credit losses methodology for estimating allowances for credit losses and applies to all financial instruments carried at amortized cost, including securities held to maturity, and makes targeted improvements to the accounting for credit losses on securities available for sale. Under FASB ASC Topic 326, the ACL is an estimate measured using relevant information about past events, including historical credit loss experience on financial assets with similar risk characteristics, current conditions, and reasonable and supportable forecasts that affect the collectability of the remaining cash flows over the contractual term of the financial assets. Trustmark adopted a zero-credit loss assumption for certain classes of securities. This zero-credit loss assumption applies to debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government. The reasons behind the adoption of the zero-credit loss assumption were as follows: • High credit rating • Long history with no credit losses • Guaranteed by a sovereign entity • Widely recognized as “risk-free rate” • Ability and authority to print its own currency • Currency is routinely held by central banks, used in international commerce, and commonly viewed as reserve currency • Currently under the U.S. Government conservatorship or receivership Trustmark continuously monitors any changes in economic conditions, credit downgrades, changes to explicit or implicit guarantees granted to certain debt issuers, and any other relevant information that would indicate potential credit deterioration and prompt Trustmark to reconsider its zero-credit loss assumption. Securities Available for Sale FASB ASC Subtopic 326-30, “Financial Instruments-Credit Losses-Available-for-Sale Debt Securities,” replaced the concept of other-than-temporarily impaired with the ACL. Unlike securities held to maturity, securities available for sale are evaluated on an individual level and pooling of securities is not allowed. 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 as outlined below: • Review the extent to which the fair value is less than the amortized cost and observe the security’s lowest credit rating as reported by third-party credit ratings companies. • The securities that violate the credit loss triggers above would be subjected to additional analysis that may include, but is not limited to: changes in market interest rates, changes in securities credit ratings, security type, service area economic factors, financial performance of the issuer/or obligor of the underlying issue and third-party guarantee. • If Trustmark determines that a credit loss exists, the credit portion of the allowance will be 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). Accrued interest receivable is excluded from the estimate of credit losses for securities available for sale and reported in other assets on the consolidated balance sheets. Securities Held to Maturity FASB ASC Subtopic 326-20, “Financial Instruments-Credit Losses-Measured at Amortized Cost,” requires institutions to measure expected credit losses on financial assets carried at amortized cost on a collective or pool basis when similar risks exist. Trustmark uses several levels of segmentation to measure expected credit losses for its held to maturity securities: • The portfolio is segmented into agency and non-agency securities. • The non-agency securities are separated into municipal, mortgage, and corporate securities. • Each individual segment is categorized by third-party credit ratings. As discussed above, Trustmark has determined that for certain classes of securities it would be appropriate to assume the expected credit loss to be zero , which include debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government. This assumption is reviewed and attested to quarterly. Trustmark uses an internally built model to verify the accuracy of third-party provided calculations. Accrued interest receivable is excluded from the estimate of credit losses for securities held to maturity and included in other assets on the consolidated balance sheets. Trustmark monitors the credit quality of securities held to maturity on a monthly basis through credit ratings. Loans Held for Sale (LHFS) Trustmark's LHFS portfolio consists of mortgage loans purchased from wholesale customers or originated in Trustmark’s General Banking Segment. Trustmark has elected to account for its LHFS under the fair value option permitted by FASB ASC Topic 825, “Financial Instruments,” with interest income on the LHFS reported in interest and fees on LHFS and LHFI. Trustmark reports unrealized gains and losses resulting from changes in the fair value of the LHFS accounted for under the fair value option as noninterest income in mortgage banking, net. 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 the fair value reported as noninterest income in mortgage banking, net. Changes in the fair value of the LHFS are largely offset by changes in the fair value of the derivative instruments. Election of the fair value option allows Trustmark to reduce the accounting volatility that would otherwise result from the asymmetry created by accounting for its LHFS at the lower of cost or fair value and the derivative instruments at fair value. Realized gains and losses upon ultimate sale of the loans are reported as noninterest income in mortgage banking, net. Government National Mortgage Association (GNMA) optional repurchase programs allow financial institutions to buy back individual delinquent mortgage loans that meet certain criteria from the securitized loan pool for which the institution provides servicing. At the servicer’s option and without GNMA’s prior authorization, the servicer may repurchase such a delinquent loan for an amount equal to 100 percent of the remaining principal balance of the loan. Under FASB ASC Topic 860, “Transfers and Servicing,” this buy-back option is considered a conditional option until the delinquency criteria are met, at which time the option becomes unconditional. When Trustmark is deemed to have regained effective control over these loans under the unconditional buy-back option, the loans can no longer be reported as sold and must be brought back onto the balance sheet as LHFS, regardless of whether Trustmark intends to exercise the buy-back option. These loans are reported as LHFS with the offsetting liability being reported as short-term borrowings. The fair value option election does not apply to the GNMA optional repurchase loans which do not meet the requirements under FASB ASC Topic 825 to be accounted for under the fair value option. Trustmark defers the upfront loan fees and costs related to the LHFS. In general, the LHFS are only retained on Trustmark’s balance sheet for 30 to 45 days before they are pooled and sold in the secondary market. The difference between deferring these loan fees and costs until the loans are sold and recognizing them in earnings as incurred as required by FASB ASC Subtopic 825-10 is considered immaterial. Deferred loan fees and costs are reflected in the basis of the LHFS and, as such, impact the resulting gain or loss when the loans are sold. Loans Held for Investment (LHFI) LHFI are loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off and are reported at amortized cost net of the ACL. Amortized cost is the amount of unpaid principal, adjusted for the net amount of direct costs and nonrefundable loan fees associated with lending. The net amount of nonrefundable loan origination fees and direct costs associated with the lending process, including commitment fees, is deferred and accreted to interest income over the lives of the loans using a method that approximates the interest method. Interest on LHFI is accrued and recorded as interest income based on the outstanding principal balance. Past due LHFI are loans contractually past due 30 days or more as to principal or interest payments. A LHFI is classified as nonaccrual, and the accrual of interest on such loan is discontinued, when the contractual payment of principal or interest becomes 90 days past due on commercial credits and 120 days past due on non-business purpose credits. In addition, a credit may be placed on nonaccrual at any other time Management has serious doubts about further collectability of principal or interest according to the contractual terms, even though the loan is currently performing. A LHFI may remain in accrual status if it is in the process of collection and well-secured. When a LHFI is placed in nonaccrual status, interest accrued but not received is reversed against interest income. Interest payments received on nonaccrual LHFI are applied against principal under the cost-recovery method, until qualifying for return to accrual status. Under the cost-recovery method, interest income is not recognized until the principal balance is reduced to zero. LHFI are restored to accrual status when the ultimate collectability of the total contractual principal and interest is no longer in doubt and the obligation has either been brought current or has performed in accordance with the contractual terms for a reasonable period of time. Purchased Credit Deteriorated (PCD) Loans Purchased loans which have experienced more than insignificant credit deterioration since origination are considered PCD loans. An initial ACL for PCD loans is determined at acquisition using the same ACL methodology as the LHFI. The initial ACL determined on a collective basis is allocated to individual loans. PCD loans are reported at the amortized cost, which equals the loan purchased price plus the initial ACL. The difference between the amortized cost basis of the PCD loan and the par value of the loan is the noncredit premium or discount, which is amortized into interest income over the life of the loan. Subsequent changes to the ACL are recorded through the PCL, LHFI. Upon adoption of FASB ASC Topic 326, Trustmark elected to maintain pools of loans that were previously accounted for under FASB ASC Subtopic 310-30, “Receivables-Loans and Debt Securities Acquired with Deteriorated Credit Quality,” and will continue to account for these pools as a unit of account. Loans are only removed from the existing loan pools if they are written off, paid off or sold. Upon adoption of FASB ASC Topic 326, the ACL was determined for each pool and added to the pool’s carrying value to establish a new amortized cost basis. The difference between the unpaid principal balance of the pool and the new amortized cost basis is the noncredit premium or discount which will be amortized into interest income over the remaining life of the pool. Changes to the ACL after adoption of FASB ASC Topic 326 are recorded through the PCL, LHFI. ACL LHFI Trustmark’s ACL methodology for LHFI is based upon guidance within FASB ASC Subtopic 326-20 as well as applicable regulatory guidance. The ACL on LHFI 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 on LHFI. The ACL on LHFI is an estimate of expected losses inherent within Trustmark’s existing LHFI portfolio. The ACL on LHFI is adjusted through the PCL, LHFI and reduced by the charge off of loan amounts, net of recoveries. The loan loss estimation process involves procedures to appropriately consider the unique characteristics of Trustmark’s LHFI portfolio segments. These segments are further disaggregated into loan classes, the level at which credit risk is estimated. When computing allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history, delinquency status and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. Evaluations of the portfolio and individual credits are inherently subjective, as they require estimates, assumptions and judgments as to the facts and circumstances of particular situations. Determining the appropriateness of the allowance is complex and requires judgment by Management about the effect of matters that are inherently uncertain. In future periods, evaluations of the overall LHFI portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and credit loss expense. Trustmark estimates the ACL on LHFI using relevant available information, from internal and external sources, relating to past events, current conditions and reasonable and supportable forecasts. Trustmark uses a third-party software application to calculate the quantitative portion of the ACL on LHFI using a methodology and assumptions specific to each loan pool. The qualitative portion of the allowance is based on general economic conditions and other internal and external factors affecting Trustmark as a whole as well as specific LHFI. Factors considered include the following: lending policies and procedures, economic conditions and concentrations of credit, nature and volume of the portfolio, performance trends, and external factors. The quantitative and qualitative portions of the allowance are added together to determine the total ACL on LHFI, which reflects Management’s expectations of future conditions based on reasonable and supportable forecasts. The methodology for estimating the amount of expected credit losses reported in the ACL on LHFI 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 ACL for the collective component, loans are segregated into loan pools based on loan product types and similar risk characteristics. 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 ACL for individual loans that do not share risk characteristics with other loans is measured as the difference between the discounted value of expected future cash flows, based on the effective interest rate at origination, and the amortized cost basis of the loan, or the net realizable value. The ACL is the difference between the loan’s net realizable value and its amortized cost basis (net of previous charge-offs and deferred loan fees and costs), except for collateral-dependent loans. 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 the ‘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. If the calculated expected credit loss is determined to be permanent or not recoverable, the amount of the expected credit loss is charged off. Accrued interest receivable is not included in the amortized cost basis of Trustmark’s LHFI and, therefore, excluded from the estimate of credit losses for LHFI. LHFI are charged off against the ACL on LHFI, with any subsequent recoveries credited back to the ACL on LHFI account. Recoveries may not exceed the aggregate of amounts previously charged off. Trustmark’s Loan Policy Manual dictates the guidelines to be followed in determining when a loan is charged off. Commercial purpose LHFI are charged off when a determination is made that the loan is uncollectible and continuance as a bankable asset is not warranted. Consumer LHFI secured by 1-4 family residential real estate are generally charged off or written down to the fair value of the collateral less cost to sell at no later than 180 days of delinquency. Non-real estate consumer purpose LHFI, including both secured and unsecured loans, are generally charged off by 120 days of delinquency. Consumer revolving lines of credit and credit card debt are generally charged off on or prior to 180 days of delinquency. ACL on Off-Balance Sheet Credit Exposures Under FASB ASC Subtopic 326-20, Trustmark is required to estimate expected credit losses for off-balance sheet credit exposures which are not unconditionally cancellable. Trustmark maintains a separate ACL on off-balance sheet credit exposures, including unfunded loan commitments and letters of credit. Expected credit losses for off-balance sheet credit exposures are estimated by calculating a commitment usage factor over the contractual period for exposures that are not unconditionally cancellable by Trustmark. Trustmark calculates a loan pool level unfunded amount for the period. Trustmark views the loan pools as either closed-ended or open-ended. Closed-ended loan pools are those that typically fund up to 100% such as other construction and nonowner-occupied. Open-ended loan pools are those that behave similar to a revolver such as the commercial and industrial and home equity line of credit loan pools. In addition to the unfunded balances, Trustmark uses a funding rate for loan pools that are considered open-ended. Trustmark calculates the funding rate of the open-ended loan pools each period. In order to mitigate volatility and incorporate historical experience in the funding rate, Trustmark uses a twelve-quarter moving average. For the closed-ended loan pools, Trustmark takes a conservative approach and uses a 100% funding rate. The expected funding rate is applied to each pool’s unfunded commitment balances to ensure that reserves will be applied to each pool based on balances expected to be funded based upon historical levels. In addition to the funding rate being applied to the unfunded commitment balance, a reserve rate is applied that incorporates both quantitative and qualitative aspects of the current period’s expected credit loss rate. The reserve rate is loan pool specific and is applied to the unfunded amount to ensure loss factors, both quantitative and qualitative, are being considered on the unfunded portion of the loan pool, consistent with the methodology applied to the funded loan pools. Adjustments to the ACL on off-balance sheet credit exposures are recorded to the PCL, 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. Premises and Equipment, Net Premises and equipment are reported at cost, less accumulated depreciation and amortization. Depreciation is charged to expense over the estimated useful lives of the assets, which are up to thirty-nine years for buildings and three to ten years for furniture and equipment. Leasehold improvements are amortized over the terms of the respective leases or the estimated useful lives of the improvements, whichever is shorter. In cases where Trustmark has the right to renew the lease for additional periods, the lease term for the purpose of calculating amortization of the capitalized cost of the leasehold improvements is extended when Trustmark is “reasonably assured” that it will renew the lease. Depreciation and amortization expenses are computed using the straight-line method. Trustmark continually evaluates whether events and circumstances have occurred that indicate that such long-lived assets have become impaired. Measurement of any impairment of such long-lived assets is based on the fair values of those assets. Branch closures and purchased land held for future branch expansion for more than five years are evaluated to determine if the related land, buildings and building improvements should be transferred to assets held for sale in accordance with FASB ASC Topic 360, “Property, Plant and Equipment.” The property is transferred to assets held for sale at the lower of its carrying value or fair value less cost to sell. An impairment loss is recorded at the time of transfer if the carrying value of the assets exceeds the fair value. Impairment losses are recorded as noninterest expense in other expense. Mortgage Servicing Rights (MSR) Trustmark recognizes as assets the rights to service mortgage loans based on the estimated fair value of the MSR when loans are sold and the associated servicing rights are retained. Trustmark has elected to account for the MSR at fair value. The fair value of the MSR is determined using a valuation model administered by a third party that calculates the present value of estimated future net servicing income. Estimates of fair value involve several assumptions, including the key valuation assumptions about market expectations of future prepayment rates, interest rates and discount rates which are provided by a third-party firm. Prepayment rates are projected using an industry standard prepayment model. The model considers other key factors, such as a wide range of standard industry assumptions tied to specific portfolio characteristics such as remittance cycles, escrow payment requirements, geographic factors, foreclosure loss exposure, VA no-bid exposure, delinquency rates and cost of servicing, including base cost and cost to service delinquent mortgages. Prevailing market conditions at the time of analysis are factored into the accumulation of assumptions and determination of servicing value. Trustmark economically hedges changes in the fair value of the MSR attributable to interest rates. See the section titled “Derivative Financial Instruments – Derivatives Not Designated as Hedging Instruments” of this note for information regarding these derivative instruments. Trustmark receives annual servicing fee income for loans serviced, which is recorded as noninterest income in mortgage banking, net. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned. Late fees and ancillary fees related to loan servicing are not considered material. Goodwill and Identifiable Intangible Assets Trustmark accounts for goodwill and other intangible assets in accordance with FASB ASC Topic 350, “Intangibles – Goodwill and Other.” Goodwill, which represents the excess of cost over the fair value of the net assets of an acquired business, is not amortized but tested for impairment on an annual basis, which is October 1 for Trustmark, or more often if events or circumstances indicate that there may be impairment. Identifiable intangible assets are acquired assets that lack physical substance but can be distinguished from goodwill because of contractual or legal rights or because the assets are capable of being sold or exchanged either on their own or in combination with a related contract, asset or liability. Trustmark’s identifiable intangible assets primarily relate to core deposits, insurance customer relationships and borrower relationships. These intangibles, which have definite useful lives, are amortized on an accelerated basis over their estimated useful lives. In addition, these intangibles are evaluated for impairment whenever events and changes in circumstances indicate that the carrying amount should be reevaluated. Trustmark also purchased banking charters in order to facilitate its entry into the states of Florida and Texas. These identifiable intangible assets are being amortized on a straight-line method over 20 years. Other Real Estate 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. When foreclosed real estate is received in full satisfaction of a loan, the amount, if any, by which the recorded amount of the loan exceeds the estimated fair value of the property is a loss charged against the ACL at the time of foreclosure. If the recorded amount of the loan is less than the estimated fair value of the property, a credit is recorded to write-downs of other real estate at the time of foreclosure. Other real estate is revalued on an annual basis or more often if market conditions necessitate. An other real estate specific reserve may be recorded through other real estate expense for declines in fair value subsequent to foreclosure based on recent appraisals or changes in market conditions. Subsequent to foreclosure, losses on the periodic revaluation of the property are charged against an existing other real estate specific reserve or as noninterest expense in other real estate expense if a reserve does not exist. Costs of operating and maintaining the properties as well as gains or losses on their disposition are also included in other real estate expense as incurred. Improvements made to properties are capitalized if the expenditures are expected to be recovered upon the sale of the properties. Leases Lessor Arrangements Trustmark leases certain types of machinery and equipment to its commercial customers through sales-type and direct financing leases as part of its equipment financing portfolio. Sales-type and direct financing leases are similar to other forms of installment lending in that lessors generally do not retain benefits and risks incidental to ownership of the property subject to the leases. Such arrangements are essentially financing transactions that permit lessees to acquire and use property. Trustmark does not have any significant operating leases in which it is the lessor. As lessor, the sum of all minimum lease payments over the lease term and the estimated residual value, less unearned interest income, is recorded as the net investment in the lease on the commencement date and is included in LHFI on the consolidated balance sheets. Interest income is accrued as earned over the term of the lease based on the net investment in the leases and is recognized in interest and fees on LHFS and LHFI on the consolidated statements of income. Certain fees or costs associated with lease originations are deferred and accreted or amortized to interest income over the life of the lease using the effective interest method. Trustmark’s portfolio of sales-type and direct financing leases generally have remaining lease terms of three to ten years, some of which include renewal options and/or options for the lessee to purchase the leased property near or at the end of the lease term at either the residual value or a specified price. Trustmark expects to sell or release the equipment at the end of the lease term. Due to the structure of these leases, there is no selling profit or loss on these transactions. Lessee Arrangements Trustmark has certain contracts that it has identified as leases according to FASB ASC Topic 842, "Leases". Trustmark classifies these leases as either operating or finance leases and recognizes a right-of-use asset and a lease liability at the lease commencement date. The lease liabil

Cash and Due from Banks

Cash and Due from Banks	12 Months Ended
	Dec. 31, 2023
Cash and Cash Equivalents [Abstract]
Cash and Due from Banks	Note 2 – Cash and Due from Banks Trustmark is no longer required to maintain average reserve balances with the Federal Reserve Bank of Atlanta based on a percentage of deposits. Effective March 26, 2020, the Federal Reserve reduced reserve requirement ratios to zero percent, eliminating the reserve requirements for all depository institutions, in order to provide liquidity in the banking system to support lending to households and businesses due to the COVID-19 pandemic.

Securities Available for Sale a

Securities Available for Sale and Held to Maturity	12 Months Ended
	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Securities Available for Sale and Held to Maturity	Note 3 – 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 December 31, 2023 and 2022 ($ in thousands): Securities Available for Sale Securities Held to Maturity Gross Gross Estimated Gross Gross Estimated Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair December 31, 2023 Cost Gains Losses Value Cost Gains Losses Value U.S. Treasury securities $ 396,179 $ — $ ( 23,811 ) $ 372,368 $ 29,068 $ — $ ( 26 ) $ 29,042 U.S. Government agency obligations 6,207 1 ( 416 ) 5,792 — — — — Obligations of states and political — — — — 340 — — 340 Mortgage-backed securities Residential mortgage pass-through Guaranteed by GNMA 25,744 4 ( 2,613 ) 23,135 13,005 — ( 497 ) 12,508 Issued by FNMA and FHLMC 1,338,256 32 ( 161,490 ) 1,176,798 469,593 — ( 18,205 ) 451,388 Other residential mortgage-backed Issued or guaranteed by FNMA, 92,076 — ( 6,002 ) 86,074 154,466 — ( 10,113 ) 144,353 Commercial mortgage-backed Issued or guaranteed by FNMA, 100,545 — ( 1,834 ) 98,711 759,807 51 ( 41,985 ) 717,873 Total $ 1,959,007 $ 37 $ ( 196,166 ) $ 1,762,878 $ 1,426,279 $ 51 $ ( 70,826 ) $ 1,355,504 December 31, 2022 U.S. Treasury securities $ 425,719 $ 308 $ ( 34,514 ) $ 391,513 $ 28,295 $ — $ ( 115 ) $ 28,180 U.S. Government agency obligations 8,297 — ( 531 ) 7,766 — — — — Obligations of states and political 4,820 53 ( 11 ) 4,862 4,510 3 ( 3 ) 4,510 Mortgage-backed securities Residential mortgage pass-through Guaranteed by GNMA 30,534 7 ( 3,444 ) 27,097 4,442 — ( 395 ) 4,047 Issued by FNMA and FHLMC 1,541,570 12 ( 196,119 ) 1,345,463 509,311 — ( 19,586 ) 489,725 Other residential mortgage-backed Issued or guaranteed by FNMA, 123,755 — ( 8,615 ) 115,140 188,201 — ( 13,826 ) 174,375 Commercial mortgage-backed Issued or guaranteed by FNMA, 136,014 — ( 3,773 ) 132,241 759,755 34 ( 54,037 ) 705,752 Total $ 2,270,709 $ 380 $ ( 247,007 ) $ 2,024,082 $ 1,494,514 $ 37 $ ( 87,962 ) $ 1,406,589 During 2022, Trustmark reclassified a total of $ 766.0 million of securities available for sale to securities held to maturity. On the date of these transfers, the net unrealized holding loss on the available for sale securities totaled approximately $ 91.9 million ($ 68.9 million, net of tax). The securities were transferred at fair value, which became the cost basis for the securities held to maturity. The net unrealized holding loss will be 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 these transfers. At December 31, 2023 , the net unamortized, unrealized loss on transferred securities included in accumulated other comprehensive income (loss) in the accompanying balance sheet totaled $ 57.6 million compared to approximately $ 69.2 million at December 31, 2022. 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 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. At both December 31, 2023 and 2022 , the results of the loss analysis performed did not identify any securities that warranted DCF analysis 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 December 31, 2023 and 2022 , accrued interest receivable totaled $ 3.7 million and $ 4.0 million, respectively, for securities available for sale and was reported in other assets on the accompanying consolidated balance sheet. Securities Held to Maturity At December 31, 2023 and 2022 , the potential credit loss exposure for Trustmark’s securities held to maturity was $ 340 thousand and $ 4.5 million, respectively, and consisted of municipal securities. After applying appropriate probability of default and loss given default assumptions, the total amount of current expected credit losses was deemed immaterial. Therefore, no reserve was recorded at December 31, 2023 and 2022. Accrued interest receivable is excluded from the estimate of credit losses for securities held to maturity. At December 31, 2023 and 2022 , accrued interest receivable totaled $ 2.6 million and $ 2.7 million for securities held to maturity and was reported in other assets on the accompanying consolidated balance sheet. At both December 31, 2023 and 2022 , 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 December 31, 2023 and 2022 . 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 December 31, 2023 and 2022 ($ in thousands): December 31, 2023 December 31, 2022 Aaa $ 1,425,939 $ 1,490,004 Aa1 to Aa3 — 3,001 Not Rated (1) 340 1,509 Total $ 1,426,279 $ 1,494,514 (1) Not rated securities primarily consist of Mississippi municipal general obligations. The table below includes securities with gross unrealized losses for which an ACL has not been recorded and segregated by length of impairment at December 31, 2023 and 2022 ($ in thousands): Less than 12 Months 12 Months or More Total Gross Gross Gross Estimated Unrealized Estimated Unrealized Estimated Unrealized December 31, 2023 Fair Value Losses Fair Value Losses Fair Value Losses U.S. Treasury securities $ 29,042 $ ( 26 ) $ 372,368 $ ( 23,811 ) $ 401,410 $ ( 23,837 ) U.S. Government agency obligations — — 5,791 ( 416 ) 5,791 ( 416 ) Mortgage-backed securities Residential mortgage pass-through Guaranteed by GNMA 9,381 ( 172 ) 25,967 ( 2,938 ) 35,348 ( 3,110 ) Issued by FNMA and FHLMC 309,466 ( 3,274 ) 1,311,865 ( 176,421 ) 1,621,331 ( 179,695 ) Other residential mortgage-backed Issued or guaranteed by FNMA, — — 230,368 ( 16,115 ) 230,368 ( 16,115 ) Commercial mortgage-backed Issued or guaranteed by FNMA, 1,656 ( 13 ) 812,520 ( 43,806 ) 814,176 ( 43,819 ) Total $ 349,545 $ ( 3,485 ) $ 2,758,879 $ ( 263,507 ) $ 3,108,424 $ ( 266,992 ) December 31, 2022 U.S. Treasury securities $ 161,298 $ ( 5,655 ) $ 258,087 $ ( 28,974 ) $ 419,385 $ ( 34,629 ) U.S. Government agency obligations 1,828 ( 184 ) 5,938 ( 347 ) 7,766 ( 531 ) Obligations of states and political 1,017 ( 11 ) 3,664 ( 3 ) 4,681 ( 14 ) Mortgage-backed securities Residential mortgage pass-through Guaranteed by GNMA 27,223 ( 3,270 ) 3,577 ( 569 ) 30,800 ( 3,839 ) Issued by FNMA and FHLMC 770,865 ( 41,807 ) 1,062,041 ( 173,898 ) 1,832,906 ( 215,705 ) Other residential mortgage-backed Issued or guaranteed by FNMA, 281,964 ( 21,452 ) 7,235 ( 989 ) 289,199 ( 22,441 ) Commercial mortgage-backed Issued or guaranteed by FNMA, 833,970 ( 57,742 ) 1,644 ( 68 ) 835,614 ( 57,810 ) Total $ 2,078,165 $ ( 130,121 ) $ 1,342,186 $ ( 204,848 ) $ 3,420,351 $ ( 334,969 ) 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. Securities Gains and Losses Realized gains and losses are determined using the specific identification method and are included in noninterest income as securities gains (losses), net. For the years ended December 31, 2023, 2022 and 2021, gross realized gains or losses as a result of calls and dispositions of securities, as well as any associated proceeds, were as follows ($ in thousands): Years Ended December 31, Available for Sale 2023 2022 2021 Proceeds from calls and sales of securities $ 4,796 $ — $ — Gross realized gains 47 — — Gross realized losses ( 8 ) — — Securities Pledged Securities with a carrying value of $ 2.321 billion and $ 2.693 billion at December 31, 2023 and 2022, respectively, were pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law. At both December 31, 2023 and 2022 , 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 December 31, 2023, 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 Securities Available for Sale Held to Maturity Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value Due in one year or less $ 65,199 $ 63,501 $ 340 $ 340 Due after one year through five years 331,225 309,108 29,068 29,042 Due after five years through ten years 2,356 2,151 — — Due after ten years 3,606 3,400 — — 402,386 378,160 29,408 29,382 Mortgage-backed securities 1,556,621 1,384,718 1,396,871 1,326,122 Total $ 1,959,007 $ 1,762,878 $ 1,426,279 $ 1,355,504

LHFI and ACL, LHFI

LHFI and ACL, LHFI	12 Months Ended
	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
LHFI and ACL, LHFI	Note 4 – LHFI and ACL, LHFI At December 31, 2023 and 2022, LHFI consisted of the following ($ in thousands): December 31, 2023 2022 Loans secured by real estate: Construction, land development and other land $ 642,886 $ 690,616 Other secured by 1-4 family residential properties 622,397 590,790 Secured by nonfarm, nonresidential properties 3,489,434 3,278,830 Other real estate secured 1,312,551 742,538 Other loans secured by real estate: Other construction 867,793 1,028,926 Secured by 1-4 family residential properties 2,282,318 2,185,057 Commercial and industrial loans 1,922,910 1,821,259 Consumer loans 165,734 170,230 State and other political subdivision loans 1,088,466 1,223,863 Other commercial loans and leases 556,035 471,930 LHFI 12,950,524 12,204,039 Less ACL 139,367 120,214 Net LHFI $ 12,811,157 $ 12,083,825 Accrued interest receivable is not included in the amortized cost basis of Trustmark’s LHFI. At December 31, 2023 and 2022 , accrued interest receivable for LHFI totaled $ 71.0 million and $ 50.7 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 December 31, 2023 , 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. Related Party Loans At December 31, 2023 and 2022 , loans to certain executive officers and directors, including their immediate families and companies in which they are principal owners, totaled $ 41.1 million and $ 47.0 million, respectively. During 2023 , $ 287.4 million of new loan advances were made, while repayments were $ 293.2 million. There were no increases in loans due to changes in executive officers and directors. Nonaccrual and Past Due LHFI No material interest income was recognized in the income statement on nonaccrual LHFI for each of the years in the three-year period ended December 31, 2023. 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 December 31, 2023 and 2022 ($ in thousands): December 31, 2023 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 $ 2,020 $ 2,642 $ — Other secured by 1-4 family residential properties 946 6,518 1,238 Secured by nonfarm, nonresidential properties 20,812 23,061 54 Other real estate secured — 158 106 Other loans secured by real estate: Other construction — 62 — Secured by 1-4 family residential properties 3,235 43,815 3,740 Commercial and industrial loans 79 22,303 24 Consumer loans — 243 628 Other commercial loans and leases — 1,206 — Total $ 27,092 $ 100,008 $ 5,790 December 31, 2022 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 $ 137 $ 1,902 $ — Other secured by 1-4 family residential properties 482 3,957 534 Secured by nonfarm, nonresidential properties 4,841 6,957 — Other real estate secured — 231 — Other loans secured by real estate: Other construction — 7,620 — Secured by 1-4 family residential properties 1,193 19,775 3,118 Commercial and industrial loans 14,441 25,102 — Consumer loans — 181 277 Other commercial loans — 247 — Total $ 21,094 $ 65,972 $ 3,929 The following tables provide an aging analysis of the amortized cost basis of past due LHFI (including nonaccrual loans) at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 Past Due 90 Days Total Current 30-59 Days 60-89 Days or More Past Due Loans Total LHFI Loans secured by real estate: Construction, land development and other land $ 93 $ 507 $ 2,362 $ 2,962 $ 639,924 $ 642,886 Other secured by 1-4 family residential properties 4,493 1,687 2,716 8,896 613,501 622,397 Secured by nonfarm, nonresidential properties 1,531 1,063 727 3,321 3,486,113 3,489,434 Other real estate secured 126 — 207 333 1,312,218 1,312,551 Other loans secured by real estate: Other construction 62 — — 62 867,731 867,793 Secured by 1-4 family residential properties 19,298 9,327 22,164 50,789 2,231,529 2,282,318 Commercial and industrial loans 11,881 484 499 12,864 1,910,046 1,922,910 Consumer loans 2,112 772 647 3,531 162,203 165,734 State and other political subdivision loans 152 — — 152 1,088,314 1,088,466 Other commercial loans and leases 1,247 58 — 1,305 554,730 556,035 Total $ 40,995 $ 13,898 $ 29,322 $ 84,215 $ 12,866,309 $ 12,950,524 December 31, 2022 Past Due 90 Days Total Current 30-59 Days 60-89 Days or More Past Due Loans Total LHFI Loans secured by real estate: Construction, land development and other land $ 1,972 $ 199 $ 34 $ 2,205 $ 688,411 $ 690,616 Other secured by 1-4 family residential properties 3,682 1,206 1,281 6,169 584,621 590,790 Secured by nonfarm, nonresidential properties 825 18 794 1,637 3,277,193 3,278,830 Other real estate secured 131 30 — 161 742,377 742,538 Other loans secured by real estate: Other construction — — 7,620 7,620 1,021,306 1,028,926 Secured by 1-4 family residential properties 10,709 4,236 9,999 24,944 2,160,113 2,185,057 Commercial and industrial loans 1,966 508 8,974 11,448 1,809,811 1,821,259 Consumer loans 2,199 645 279 3,123 167,107 170,230 State and other political subdivision loans 431 — — 431 1,223,432 1,223,863 Other commercial loans 785 45 24 854 471,076 471,930 Total $ 22,700 $ 6,887 $ 29,005 $ 58,592 $ 12,145,447 $ 12,204,039 Modified LHFI Occasionally, Trustmark modifies loans for borrowers experiencing financial difficulties by providing payment concessions, interest-only payments for an extended period of time, maturity extensions or interest rate reductions. Other concessions may arise from court proceedings or may be imposed by law. In some cases, Trustmark provides multiple types of concessions on one loan. The following tables present the amortized cost of LHFI at the end of each of the periods presented of loans modified to borrowers experiencing financial difficulty disaggregated by class of loan and type of modification ($ in thousands). The percentage of the amortized cost basis of LHFI that were modified to borrowers in financial distress as compared to the amortized cost basis of each class of LHFI is also presented below : Year Ended December 31, 2023 Payment Concessions Term Extensions Total % of Total Class of Loan Loans secured by real estate: Other secured by 1-4 family residential properties $ — $ 805 $ 805 0.13 % Secured by nonfarm, nonresidential properties — 359 359 0.01 % Other loans secured by real estate: Secured by 1-4 family residential properties — 1,148 1,148 0.05 % Commercial and industrial loans 242 — 242 0.01 % Consumer loans — 36 36 0.02 % Other commercial loans and leases 116 31 147 0.03 % Total $ 358 $ 2,379 $ 2,737 0.02 % The following table details the financial effect of the loan modifications presented above to borrowers experiencing financial difficulty for the periods presented : Year Ended December 31, 2023 Financial Effect Payment Concessions Term Extensions Loans secured by real estate: Other secured by 1-4 family residential properties Modifed lines of credit to amortize over 12 month and 24 month terms Secured by nonfarm, nonresidential properties One loan renewed and extended maturity by six months Other loans secured by real estate: Secured by 1-4 family residential properties Extended amortization with term adjusted by weighted-average 3.4 years Commercial and industrial loans Six month payment deferrals Consumer loans Bankruptcies extended amortization with term adjusted by weighted average 1.3 years reducing borrower payment Other commercial loans and leases Six month payment deferrals One loan renewed and extended maturity by seven months Trustmark had no unused commitments on modified loans to borrowers experiencing financial difficulty at December 31, 2023. During the year ended December 31, 2023, Trustmark had payment concession balances of $ 116 thousand at default for LHFI in the other commercial loans and leases portfolio that had a payment default and were modified within the twelve months prior to that default to borrowers experiencing financial difficulty. Trustmark has utilized loans 90 days or more past due to define payment default in determining modified loans that have subsequently defaulted. If Trustmark determines that a modified loan (or a portion of a loan) has subsequently been deemed uncollectible, the loan (or a portion of the loan) is charged off against the ACL, LHFI. Trustmark closely monitors the performance of loans that are modified to borrowers experiencing financial difficulty to understand the effectiveness of its modification efforts. The following tables provide details of the performance of such LHFI that have been modified during the periods presented ($ in thousands): Year Ended December 31, 2023 Past Due 90 Days Total Current 30-59 Days 60-89 Days or More Past Due Loans Total Loans secured by real estate: Other secured by 1-4 family residential properties $ 290 $ 17 $ — $ 307 $ 498 $ 805 Secured by nonfarm, nonresidential properties — — — — 359 359 Other loans secured by real estate: Secured by 1-4 family residential properties 64 — — 64 1,084 1,148 Commercial and industrial loans — — — — 242 242 Consumer loans 17 — — 17 19 36 Other commercial loans and leases — — — — 147 147 Total $ 371 $ 17 $ — $ 388 $ 2,349 $ 2,737 Collateral-Dependent Loans The following tables present the amortized cost basis of collateral-dependent loans by class of loans and collateral type at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 Real Estate Vehicles Miscellaneous Total Loans secured by real estate: Construction, land development and $ 2,020 $ — $ — $ 2,020 Other secured by 1-4 family 946 — — 946 Secured by nonfarm, nonresidential 20,812 — — 20,812 Other loans secured by real estate: Secured by 1-4 family residential 3,235 — — 3,235 Commercial and industrial loans 38 41 21,023 21,102 Other commercial loans and leases — — 967 967 Total $ 27,051 $ 41 $ 21,990 $ 49,082 December 31, 2022 Real Estate Inventory and Receivables Vehicles Miscellaneous Total Loans secured by real estate: Construction, land development and $ 1,558 $ — $ — $ — $ 1,558 Other secured by 1-4 family 482 — — — 482 Secured by nonfarm, nonresidential 4,841 — — — 4,841 Other loans secured by real estate: Other construction 7,620 — — — 7,620 Secured by 1-4 family residential 1,193 — — — 1,193 Commercial and industrial loans 40 233 395 23,926 24,594 Total $ 15,734 $ 233 $ 395 $ 23,926 $ 40,288 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. There have been no 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 or other non-real estate collateral. 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 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 loan 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 by 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 certain 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 modified loan to a borrower experiencing financial difficulty 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 modified status. Quarterly, the Credit Quality Review Committee reviews and modifies continuous action plans for all credits risk rated seven or worse for relationships of $100 thousand or more . In addition, periodic reviews of significant development, commercial construction, multi-family and nonowner-occupied projects are performed. These reviews assess each particular project with respect to location, project valuations, progress of completion, leasing status, current financial information, rents, operating expenses, cash flow, adherence to budget and projections and other information as applicable. Summary results are reviewed by Senior and Regional Credit Officers in addition to the Chief Credit Officer with a determination made as to the appropriateness of existing risk ratings and accrual status. Consumer Credits The Retail Credit Review Committee, Management Credit Policy Committee and the Enterprise Risk Committee review the volume and percentage of consumer loan delinquencies and losses to monitor the overall quality of the consumer portfolio. Trustmark monitors the levels and severity of past due consumer LHFI on a daily basis through its collection activities. A detailed assessment of consumer LHFI delinquencies is performed monthly at both a product and market level. The tables below present the amortized cost basis of loans by credit quality indicator and class of loans based on analyses performed at December 31, 2023 and 2022 ($ in thousands): Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of December 31, 2023 Commercial LHFI Loans secured by real estate: Construction, land development Pass - RR 1 through RR 6 $ 359,813 $ 98,742 $ 35,095 $ 10,591 $ 2,036 $ 1,961 $ 52,351 $ 560,589 Special Mention - RR 7 — — 360 — — — — 360 Substandard - RR 8 606 336 1,512 19 — 21 — 2,494 Doubtful - RR 9 — — — — — 24 — 24 Total 360,419 99,078 36,967 10,610 2,036 2,006 52,351 563,467 Current period gross — ( 4 ) ( 10 ) — ( 228 ) — — ( 242 ) Other secured by 1-4 family residential Pass - RR 1 through RR 6 $ 33,072 $ 30,760 $ 29,159 $ 14,309 $ 8,084 $ 2,822 $ 10,077 $ 128,283 Special Mention - RR 7 — 82 48 10 — — — 140 Substandard - RR 8 220 625 157 22 80 306 98 1,508 Doubtful - RR 9 — — — — — — — — Total 33,292 31,467 29,364 14,341 8,164 3,128 10,175 129,931 Current period gross — — ( 24 ) — — ( 6 ) — ( 30 ) Secured by nonfarm, nonresidential Pass - RR 1 through RR 6 $ 501,327 $ 919,519 $ 526,412 $ 596,240 $ 323,687 $ 369,250 $ 129,142 $ 3,365,577 Special Mention - RR 7 4,271 14,930 — 138 23,966 — — 43,305 Substandard - RR 8 6,332 1,964 47,491 10,809 8,614 5,200 48 80,458 Doubtful - RR 9 21 — — — 53 13 — 87 Total 511,951 936,413 573,903 607,187 356,320 374,463 129,190 3,489,427 Current period gross — ( 39 ) ( 82 ) — ( 19 ) ( 138 ) — ( 278 ) Other real estate secured: Pass - RR 1 through RR 6 $ 194,141 $ 447,200 $ 332,818 $ 209,757 $ 56,024 $ 11,080 $ 8,880 $ 1,259,900 Special Mention - RR 7 126 2,076 — — 35,881 — — 38,083 Substandard - RR 8 — 14,064 — 290 — 39 — 14,393 Doubtful - RR 9 42 — — — — — — 42 Total 194,309 463,340 332,818 210,047 91,905 11,119 8,880 1,312,418 Current period gross — — — — — — — — Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of December 31, 2023 Commercial LHFI Other loans secured by real estate: Other construction Pass - RR 1 through RR 6 $ 179,676 $ 518,062 $ 149,883 $ 14,062 $ — $ 6 $ 6,042 $ 867,731 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 62 — — — — — — 62 Doubtful - RR 9 — — — — — — — — Total 179,738 518,062 149,883 14,062 — 6 6,042 867,793 Current period gross ( 61 ) — ( 3,392 ) — — — — ( 3,453 ) Commercial and industrial loans: Pass - RR 1 through RR 6 $ 497,730 $ 474,737 $ 158,659 $ 80,646 $ 31,876 $ 44,972 $ 537,527 $ 1,826,147 Special Mention - RR 7 12,570 10,141 3,149 1,381 110 — 126 27,477 Substandard - RR 8 4,797 16,872 13,909 11,958 40 80 21,528 69,184 Doubtful - RR 9 6 58 1 — — 25 12 102 Total 515,103 501,808 175,718 93,985 32,026 45,077 559,193 1,922,910 Current period gross ( 42 ) ( 1,071 ) ( 700 ) ( 138 ) ( 95 ) ( 108 ) ( 7 ) ( 2,161 ) State and other political subdivision loans: Pass - RR 1 through RR 6 $ 152,157 $ 247,034 $ 174,812 $ 99,786 $ 32,118 $ 377,225 $ 5,334 $ 1,088,466 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 — — — — — — — — Doubtful - RR 9 — — — — — — — — Total 152,157 247,034 174,812 99,786 32,118 377,225 5,334 1,088,466 Current period gross — — — — — — — — Other commercial loans and leases: Pass - RR 1 through RR 6 $ 211,402 $ 48,947 $ 30,071 $ 21,377 $ 32,837 $ 8,468 $ 201,339 $ 554,441 Special Mention - RR 7 — — — 208 — — 20 228 Substandard - RR 8 106 211 42 — — — 987 1,346 Doubtful - RR 9 — — — — — 20 — 20 Total 211,508 49,158 30,113 21,585 32,837 8,488 202,346 556,035 Current period gross ( 40 ) ( 248 ) — ( 26 ) — — — ( 314 ) Total commercial LHFI $ 2,158,477 $ 2,846,360 $ 1,503,578 $ 1,071,603 $ 555,406 $ 821,512 $ 973,511 $ 9,930,447 Total commercial LHFI $ ( 143 ) $ ( 1,362 ) $ ( 4,208 ) $ ( 164 ) $ ( 342 ) $ ( 252 ) $ ( 7 ) $ ( 6,478 ) Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of December 31, 2023 Consumer LHFI Loans secured by real estate: Construction, land development and Current $ 44,912 $ 23,110 $ 5,973 $ 1,203 $ 1,082 $ 1,864 $ 653 $ 78,797 Past due 30-89 days — 250 — — 30 191 — 471 Past due 90 days or more — — — — — — — — Nonaccrual — — 148 — — 3 — 151 Total 44,912 23,360 6,121 1,203 1,112 2,058 653 79,419 Current period gross — — — — — — — — Other secured by 1-4 family residential Current $ 29,636 $ 11,366 $ 5,733 $ 4,471 $ 4,313 $ 7,674 $ 417,383 $ 480,576 Past due 30-89 days 225 68 74 4 51 220 4,292 4,934 Past due 90 days or more — 264 — — — 41 934 1,239 Nonaccrual 8 76 48 8 — 616 4,961 5,717 Total 29,869 11,774 5,855 4,483 4,364 8,551 427,570 492,466 Current period gross — ( 100 ) ( 9 ) ( 2 ) ( 10 ) ( 22 ) ( 147 ) ( 290 ) Secured by nonfarm, nonresidential Current $ — $ — $ 7 $ — $ — $ — $ — $ 7 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — — 7 — — — — 7 Current period gross — — — — — — — — Other real estate secured: Current $ — $ — $ — $ 78 $ — $ 55 $ — $ 133 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — — — 78 — 55 — 133 Current period gross — — — — — — — — Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of December 31, 2023 Consumer LHFI Other loans secured by real estate: Secured by 1-4 family residential properties Current $ 258,800 $ 878,893 $ 516,324 $ 180,272 $ 98,552 $ 277,664 $ — $ 2,210,505 Past due 30-89 days 3,370 11,293 5,513 2,121 298 1,664 — 24,259 Past due 90 days or more 376 1,219 1,208 682 — 255 — 3,740 Nonaccrual 678 15,586 11,452 4,884 1,848 9,366 — 43,814 Total 263,224 906,991 534,497 187,959 100,698 288,949 — 2,282,318 Current period gross ( 64 ) ( 930 ) ( 217 ) ( 104 ) — ( 142 ) — ( 1,457 ) Consumer loans: Current $ 59,496 $ 32,767 $ 10,698 $ 2,604 $ 917 $ 294 $ 55,321 $ 162,097 Past due 30-89 days 1,274 475 134 34 5 5 839 2,766 Past due 90 days or more 64 44 3 1 — — 516 628 Nonaccrual 44 65 84 26 — — 24 243 Total 60,878 33,351 10,919 2,665 922 299 56,700 165,734 Current period gross ( 6,138 ) ( 559 ) ( 167 ) ( 43 ) ( 1 ) ( 1 ) ( 2,381 ) ( 9,290 ) Total consumer LHFI $ 398,883 $ 975,476 $ 557,399 $ 196,388 $ 107,096 $ 299,912 $ 484,923 $ 3,020,077 Total consumer LHFI $ ( 6,202 ) $ ( 1,589 ) $ ( 393 ) $ ( 149 ) $ ( 11 ) $ ( 165 ) $ ( 2,528 ) $ ( 11,037 ) Total LHFI $ 2,557,360 $ 3,821,836 $ 2,060,977 $ 1,267,991 $ 662,502 $ 1,121,424 $ 1,458,434 $ 12,950,524 Total current period $ ( 6,345 ) $ ( 2,951 ) $ ( 4,601 ) $ ( 313 ) $ ( 353 ) $ ( 417 ) $ ( 2,535 ) $ ( 17,515 ) Term Loans by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Total As of December 31, 2022 Commercial LHFI Loans secured by real estate: Construction, land development Pass - RR 1 through RR 6 $ 363,824 $ 119,727 $ 29,632 $ 3,405 $ 1,016 $ 2,364 $ 64,953 $ 584,921 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 146 199 — 1,415 — — 44 1,804 Doubtful - RR 9 — — — — — 42 — 42 Total 363,970 119,926 29,632 4,820 1,016 2,406 64,997 586,767 Other secured by 1-4 family residential Pass - RR 1 through RR 6 $ 41,996 $ 33,346 $ 17,215 $ 9,341 $ 6,798 $ 2,870 $ 12,209 $ 123,775 Special Mention - RR 7 29 64 17 — — — — 110 Substandard - RR 8 686 31 75 88 220 285 — 1,385 Doubtful - RR 9 15 — — — — — — 15 Total 42,726 33,441 17,307 9,429 7,018 3,155 12,209 125,285 Secured by nonfarm, nonresidential Pass - RR 1 through RR 6 $ 889,556 $ 657,242 $ 603,515 $ 457,163 $ 205,425 $ 281,828 $ 130,052 $ 3,224,781 Special Mention - RR 7 10,284 — — 271 — — — 10,555 Substandard - RR 8 12,034 1,066 9,457 905 706 18,488 693 43,349 Doubtful - RR 9 34 — — 77 — 18 — 129 Total 911,908 658,308 612,972 458,416 206,131 300,334 130,745 3,278,814 Other real estate secured: Pass - RR 1 through RR 6 $ 293,051 $ 156,386 $ 143,114 $ 107,827 $ 11,297 $ 17,626 $ 12,516 $ 741,817 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 30 — 309 — 5 68 126 538 Doubtful - RR 9 — — — — — — — — Total 293,081 156,386 143,423 107,827 11,302 17,694 12,642 742,355 Term Loans by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Total As of December 31, 2022 Commercial LHFI Other loans secured by real estate: Other construction Pass - RR 1 through RR 6 $ 372,981 $ 306,904 $ 340,388 $ 833 $ — $ — $ 200 $ 1,021,306 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 — 7,620 — — — — — 7,620 Doubtful - RR 9 — — — — — — — — Total 372,981 314,524 340,388 833 — — 200 1,028,926 Commercial and industrial loans: Pass - RR 1 through RR 6 $ 673,848 $ 261,962 $ 120,123 $ 44,994 $ 14,265 $ 69,078 $ 577,749 $ 1,762,019 Special Mention - RR 7 — — 12,421 — — — 6,454 18,875 Substandard - RR 8 6,973 9,845 2,170 312 74 — 20,625 39,999 Doubtful - RR 9 240 53 10 4 35 — 24 366 Total 681,061 271,860 134,724 45,310 14,374 69,078 604,852 1,821,259 State and other political subdivision loans: Pass - RR 1 through RR 6 $ 393,345 $ 223,302 $ 123,350 $ 39,031 $ 18,876 $ 421,588 $ 1,671 $ 1,221,163 Special Mention - RR 7 — — — — — 2,700 — 2,700 Substandard - RR 8 — — — — — — — — Doubtful - RR 9 — — — — — — — — Total 393,345 223,302 123,350 39,031 18,876 424,288 1,671 1,223,863 Other commercial loans: Pass - RR 1 through RR 6 $ 88,763 $ 40,006 $ 28,239 $ 37,607 $ 6,424 $ 10,829 $ 244,882 $ 456,750 Special Mention - RR 7 879 — — — — — — 879 Substandard - RR 8 3,728 98 — — 16 1,134 9,301 14,277 Doubtful - RR 9 24 — — — — — — 24 Total 93,394 40,104 28,239 37,607 6,440 11,963 254,183 471,930 Total commercial LHFI $ 3,152,466 $ 1,817,851 $ 1,430,035 $ 703,273 $ 265,157 $ 828,918 $ 1,081,499 $ 9,279,199 Term Loans by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Total As of December 31, 2022 Consumer LHFI Loans secured by real estate: Construction, land development and Current $ 62,049 $ 32,867 $ 3,304 $ 1,759 $ 1,679 $ 1,915 $ — $ 103,573 Past due 30-89 days — 150 — 36 15 9 — 210 Past due 90 days or more — — — — — — — — Nonaccrual — 58 — — — 8 — 66 Total 62,049 33,075 3,304 1,795 1,694 1,932 — 103,849 Other secured by 1-4 family residential Current $ 25,402 $ 7,983 $ 5,389 $ 4,894 $ 3,701 $ 7,252 $ 403,123 $ 457,744 Past due 30-89 days 19 35 15 134 5 286 3,197 3,691 Past due 90 days or more — — — 1 — — 452 453 Nonaccrual 88 24 4 20 7 454 3,020 3,617 Total 25,509 8,042 5,408 5,049 3,713 7,992 409,792 465,505 Secured by nonfarm, nonresidential Current $ — $ 16 $ — $ — $ — $ — $ — $ 16 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — 16 — — — — — 16 Other real estate secured: Current $ — $ — $ 89 $ — $ 5 $ 89 $ — $ 183 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — — 89 — 5 89 — 183 Term Loans by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Total As of December 31, 2022 Consumer LHFI Other loans secured by real estate: Secured by 1-4 family residential properties Current $ 939,511 $ 559,804 $ 198,769 $ 109,466 $ 80,249 $ 262,196 $ — $ 2,149,995 Past due 30-89 days 3,967 3,752 2,119 425 — 1,906 — 12,169 Past due 90 days or more 835 777 272 — 134 1,100 — 3,118 Nonaccrual 2,363 4,180 3,275 1,896 2,028 6,033 — 19,775 Total 946,676 568,513 204,435 111,787 82,411 271,235 — 2,185,057 Consumer loans: Current $ 70,858 $ 25,771 $ 9,514 $ 2,509 $ 1,513 $ 295 $ 56,508 $ 166,968 Past due 30-89 days 1,431 238 159 8 23 10 946 2,815 Past due 90 days or more 28 12 7 1 2 — 216 266 Nonaccrual 79 41 19 17 4 — 21 181 Total 72,396 26,062 9,699 2,535 1,542 305 57,691 170,230 Total consumer LHFI $ 1,106,630 $ 635,708 $ 222,935 $ 121,166 $ 89,365 $ 281,553 $ 467,483 $ 2,924,840 Total LHFI $ 4,259,096 $ 2,453,559 $ 1,652,970 $ 824,439 $ 354,522 $ 1,110,471 $ 1,548,982 $ 12,204,03

Premises and Equipment, Net

Premises and Equipment, Net	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Premises and Equipment, Net	Note 5 – Premises and Equipment, Net At December 31, 2023 and 2022, premises and equipment, net consisted of the following ($ in thousands): December 31, 2023 2022 Land $ 56,747 $ 54,300 Buildings and leasehold improvements 247,173 237,215 Furniture and equipment 212,625 198,698 Total cost of premises and equipment 516,545 490,213 Less accumulated depreciation and amortization 288,956 282,385 Premises and equipment, net 227,589 207,828 Finance lease right-of-use assets 3,751 4,537 Assets held for sale 1,197 — Total premises and equipment, net $ 232,537 $ 212,365 There were three properties included in assets held for sale at December 31, 2023 compared to no properties at December 31, 2022 . These properties were transferred from premises and equipment, net to assets held for sale due to Trustmark’s intent to sell the properties over the subsequent twelve months as a result of its strategic initiatives. Property valuation adjustments of $ 470 thousand were recognized and included in other expense for 2023 compared to $ 400 thousand for 2022 and $ 140 thousand for 2021. Depreciation and amortization of premises and equipment totaled $ 17.4 million in 2023 , $ 16.2 million in 2022 and $ 15.6 million in 2021 .

Mortgage Banking

Mortgage Banking	12 Months Ended
	Dec. 31, 2023
Mortgage Banking [Abstract]
Mortgage Banking	Note 6 – Mortgage Banking MSR The activity in the MSR is detailed in the table below for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 Balance at beginning of period $ 129,677 $ 87,687 Origination of servicing assets 13,712 17,843 Change in fair value: Due to market changes ( 1,489 ) 38,181 Due to runoff ( 10,030 ) ( 14,034 ) Balance at end of period $ 131,870 $ 129,677 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, the float rate, which is the interest rate earned on escrow balances, and the discount rate as some of the primary assumptions used 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. An increase in the float rate will result in an increase in the fair value of the MSR, while a decrease in the float rate will result in a decrease in the fair value of the MSR. At December 31, 2023 , the fair value of the MSR included an assumed average prepayment speed of 9 CPR and an average discount rate of 10.07 % compared to an assumed average prepayment speed of 8 CPR and an average discount rate of 10.08 % at December 31, 2022. Mortgage Loans Sold/Serviced During 2023, 2022 and 2021 , Trustmark sold $ 1.136 billion, $ 1.243 billion and $ 2.286 billion, respectively, of residential mortgage loans. Gain on sales of loans, net totaled $ 15.3 million in 2023 , $ 20.2 million in 2022 and $ 56.0 million in 2021 . Trustmark receives annual servicing fee income approximating 0.32 % of the outstanding balance of the underlying loans, which totaled $ 26.9 million in 2023 , $ 26.0 million in 2022 and $ 25.1 million in 2021. The gains on the sale of residential mortgage loans and the annual servicing fee are both recorded to noninterest income in mortgage banking, net in the accompanying consolidated statements of income. The investors and the securitization trusts have no recourse to the assets of Trustmark for failure of debtors to pay when due. The table below details the mortgage loans sold and serviced for others at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 2022 Federal National Mortgage Association $ 4,826,028 $ 4,684,815 Government National Mortgage Association 3,510,983 3,350,222 Federal Home Loan Mortgage Corporation 112,352 52,023 Other 28,012 28,764 Total mortgage loans sold and serviced for others $ 8,477,375 $ 8,115,824 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 Representations and Warranties Framework, which provides that FNMA and FHLMC will not exercise their remedies, including a putback request, for breaches of certain selling representations and warranties, such as payment history or 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 were included in other expense. At both December 31, 2023 and 2022 , 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.

Goodwill and Identifiable Intan

Goodwill and Identifiable Intangible Assets	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Identifiable Intangible Assets	Note 7 – Goodwill and Identifiable Intangible Assets Goodwill The table below illustrates goodwill by segment for the years ended December 31, 2023 and 2022 ($ in thousands): General Banking Insurance Total Balance as of January 1, 2022 $ 334,603 $ 49,634 $ 384,237 Adjustment during 2022 — — — Balance as of December 31, 2022 334,603 49,634 384,237 Adjustment during 2023 — — — Balance as of December 31, 2023 $ 334,603 $ 49,634 $ 384,237 Trustmark’s General Banking Segment delivers a full range of banking services to consumer, corporate, small and middle-market businesses through its extensive branch network. The Insurance Segment includes TNB’s wholly-owned retail insurance subsidiary that offers a diverse mix of insurance products and services. Trustmark performed goodwill impairment tests for the General Banking and Insurance Segments during 2023, 2022 and 2021 . Based on these tests, Trustmark concluded that the fair value of both the General Banking and Insurance Segments exceeded the book value and no impairment charge was required. Identifiable Intangible Assets At December 31, 2023 and 2022, identifiable intangible assets consisted of the following ($ in thousands): December 31, 2023 December 31, 2022 Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Amount Amortization Amount Amount Amortization Amount Core deposit intangibles $ 87,674 $ 87,439 $ 235 $ 87,674 $ 87,199 $ 475 Insurance intangibles 17,272 14,542 2,730 17,272 14,157 3,115 Banking charters 1,325 1,325 — 1,325 1,275 50 Total $ 106,271 $ 103,306 $ 2,965 $ 106,271 $ 102,631 $ 3,640 Trustmark recorded $ 675 thousand of amortization of identifiable intangible assets in 2023 , $ 1.4 million in 2022 and $ 2.3 million in 2021 . Trustmark estimates that amortization expense for identifiable intangible assets will be $ 469 thousand in 2024, $ 403 thousand in 2025, $ 341 thousand in 2026, $ 283 thousand in 2027 and $ 250 thousand in 2028. Trustmark continually evaluates whether events and circumstances have occurred that indicate that identifiable intangible assets have become impaired. Measurement of any impairment of such identifiable intangible assets is based on the fair values of those assets. There were no impairment losses on identifiable intangible assets recorded during 2023, 2022 or 2021. The following table illustrates the carrying amounts and remaining weighted-average amortization periods of identifiable intangible assets at December 31, 2023 ($ in thousands): Remaining Weighted- Average Net Carrying Amortization Amount Period in Years Core deposit intangibles $ 235 3.2 Insurance intangibles 2,730 14.9 Total $ 2,965 13.9

Other Real Estate

Other Real Estate	12 Months Ended
	Dec. 31, 2023
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Other Real Estate	Note 8 – Other Real Estate At December 31, 2023, Trustmark’s geographic other real estate distribution was primarily concentrated in its Alabama, Mississippi and Texas market regions. The ultimate recovery of a substantial portion of the carrying amount of other real estate is susceptible to changes in market conditions in this area. For the periods presented, changes and gains (losses), net on other real estate were as follows ($ in thousands): Years Ended December 31, 2023 2022 2021 Balance at beginning of period $ 1,986 $ 4,557 $ 11,651 Additions 7,237 1,533 770 Disposals ( 2,555 ) ( 4,142 ) ( 6,932 ) (Write-downs) recoveries 199 38 ( 932 ) Balance at end of period $ 6,867 $ 1,986 $ 4,557 Gains (losses), net on the sale of other real estate $ ( 145 ) $ ( 1,006 ) $ ( 1,869 ) At December 31, 2023 and 2022, other real estate by type of property consisted of the following ($ in thousands): December 31, 2023 2022 1-4 family residential properties $ 1,977 $ 1,128 Nonfarm, nonresidential properties 4,835 561 Other real estate properties 55 297 Total other real estate $ 6,867 $ 1,986 At December 31, 2023 and 2022, other real estate by geographic location consisted of the following ($ in thousands): December 31, 2023 2022 Alabama $ 1,397 $ 194 Mississippi (1) 1,242 1,769 Tennessee (2) — 23 Texas 4,228 — Total other real estate $ 6,867 $ 1,986 (1) Mississippi includes Central and Southern Mississippi Regions. (2) Tennessee includes Memphis, Tennessee and Northern Mississippi Regions. At December 31, 2023 and 2022 , the balance of other real estate included $ 2.0 million and $ 1.1 million, respectively, of foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property. At December 31, 2023 and 2022 , the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process was $ 6.4 million and $ 2.9 million, respectively.

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Leases	Note 9 – Leases Lessor Arrangements Trustmark leases certain types of machinery and equipment to its customers through sales-type and direct financing leases as part of its equipment financing portfolio. These leases generally have remaining lease terms of three to ten years , some of which include renewal options and/or options for the lessee to purchase the leased property near or at the end of the lease term. Trustmark recognized interest income from its sales-type and direct financing leases of $ 3.2 million for the year ended December 31, 2023. Trustmark does not have any significant operating leases in which it is the lessor. The table below summarizes the components of Trustmark's net investment in its sales-type and direct financing leases at December 31, 2023 ($ in thousands): December 31, 2023 Leases receivable $ 161,319 Unearned income ( 29,011 ) Initial direct costs 1,326 Unguaranteed lease residual 4,101 Total net investment $ 137,735 The table below details the minimum future lease payments for Trustmark's leases receivable at December 31, 2023 ($ in thousands): December 31, 2023 2024 $ 24,647 2025 25,617 2026 24,176 2027 36,295 2028 21,141 Thereafter 29,443 Total leases receivable $ 161,319 Lessee Arrangements The table below details the components of net lease cost for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Finance leases Amortization of right-of-use assets $ 786 $ 1,479 $ 1,546 Interest on lease liabilities 163 188 219 Operating lease cost 5,311 5,172 5,275 Short-term lease cost 277 389 463 Variable lease cost 906 1,150 1,234 Sublease income ( 12 ) ( 168 ) ( 350 ) Net lease cost $ 7,431 $ 8,210 $ 8,387 The table below details the cash payments included in the measurement of lease liabilities during the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Finance leases Operating cash flows included in operating activities $ 163 $ 188 $ 219 Financing cash flows included in payments under finance lease 721 1,409 1,434 Operating leases Operating cash flows (fixed payments) included in other operating 4,188 4,829 4,781 Operating cash flows (liability reduction) included in other operating 3,643 4,009 3,948 The table below details balance sheet information, as well as weighted-average lease terms and discount rates, related to leases at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 2022 Finance lease right-of-use assets, net of accumulated depreciation $ 3,751 $ 4,537 Finance lease liabilities 4,334 5,055 Operating lease right-of-use assets 38,142 36,301 Operating lease liabilities 41,584 38,932 Weighted-average lease term Finance leases 8.34 years 8.72 years Operating leases 10.13 years 9.64 years Weighted-average discount rate Finance leases 3.61 % 3.49 % Operating leases 3.64 % 3.22 % At December 31, 2023, future minimum rental commitments under finance and operating leases were as follows ($ in thousands): Finance Leases Operating Leases 2024 $ 573 $ 5,051 2025 584 5,119 2026 589 4,967 2027 594 5,020 2028 599 4,860 Thereafter 2,086 25,452 Total minimum lease payments 5,025 50,469 Less imputed interest ( 691 ) ( 8,885 ) Lease liabilities $ 4,334 $ 41,584

Deposits

Deposits	12 Months Ended
	Dec. 31, 2023
Deposits [Abstract]
Deposits	Note 10 – Deposits At December 31, 2023 and 2022, deposits consisted of the following ($ in thousands): December 31, 2023 2022 Noninterest-bearing demand $ 3,197,620 $ 4,093,771 Interest-bearing demand 4,947,626 4,773,219 Savings 4,047,853 4,282,435 Time 3,376,664 1,288,223 Total $ 15,569,763 $ 14,437,648 Interest expense on deposits by type consisted of the following for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Interest-bearing demand $ 121,138 $ 16,409 $ 4,906 Savings 28,605 9,654 7,912 Time 96,208 3,006 4,127 Total $ 245,951 $ 29,069 $ 16,945 Time deposits that exceed the FDIC insurance limit of $250 thousand totaled $ 822.4 million and $ 247.2 million at December 31, 2023 and 2022, respectively. The maturities of interest-bearing deposits at December 31, 2023, are as follows ($ in thousands): 2024 $ 3,199,607 2025 142,607 2026 19,632 2027 7,433 2028 5,503 Thereafter 1,882 Total time deposits 3,376,664 Interest-bearing deposits with no stated maturity 8,995,479 Total interest-bearing deposits $ 12,372,143

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Borrowings	Note 11 - Borrowings 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 are secured by securities with a carrying amount of $ 61.6 million and $ 102.4 million at December 31, 2023 and 2022, respectively. At both December 31, 2023 and 2022, 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 December 31, 2023 and 2022 ($ in thousands): December 31, 2023 2022 Mortgage-backed securities Residential mortgage pass-through securities Issued by FNMA and FHLMC $ 28,600 $ 41,732 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 526 1,111 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA — 21,277 Total securities sold under repurchase agreements $ 29,126 $ 64,120 Other Borrowings At December 31, 2023 and 2022, other borrowings consisted of the following ($ in thousands): December 31, 2023 2022 FHLB advances $ 400,058 $ 975,078 Serviced GNMA loans eligible for repurchase 78,838 70,805 Finance lease liabilities 4,334 5,055 Total other borrowings $ 483,230 $ 1,050,938 FHLB Advances At both December 31, 2023 and 2022 , Trustmark had no outstanding short-term FHLB advances with the FHLB of Atlanta. At both December 31, 2023 and 2022 , Trustmark had one outstanding long-term FHLB advance with the FHLB of Atlanta totaling $ 58 thousand and $ 78 thousand, respectively. This advance was assumed through the BancTrust merger and had a fixed interest rate of 0.08 %. At December 31, 2023 and 2022 , this advance had a remaining maturity of 2.71 years and 3.71 years, respectively. There was no fair market value adjustment associated with the BancTrust merger included in the FHLB advances at December 31, 2023 and 2022. Trustmark’s FHLB advances are collateralized by securities held in safekeeping with the FHLB of Atlanta. At December 31, 2023 , Trustmark had five outstanding short-term FHLB advances totaling $ 400.0 million and no long-term FHLB advances with the FHLB of Dallas, compared to four outstanding short-term FHLB advances totaling $ 975.0 million and no long-term FHLB advances with the FHLB of Dallas at December 31, 2022. The outstanding short-term advances with the FHLB of Dallas had fixed rates ranging from 5.38 % and 5.61 % with balances ranging from $ 50.0 million to $ 125.0 million. The outstanding short-term FHLB advances had a weighted-average remaining maturity of 9 days with a weighted-average cost of 5.54 % at December 31, 2023, compared to a weighted-average remaining maturity of 10 days with a weighted-average cost of 4.58 % at December 31, 2022. Trustmark incurred $ 49.9 million of interest expense on short-term FHLB advances in 2023 , compared to $ 4.8 million of interest expense in 2022 and $ 2 thousand of interest expense in 2021 . Trustmark incurred no interest expense on long-term FHLB advances in 2023, 2022 and 2021. At December 31, 2023 and 2022 , Trustmark had $ 4.003 billion and $ 3.034 billion, respectively, available in additional borrowing capacity from the FHLB of Dallas. Subordinated Notes During 2020, Trustmark agreed to issue and sell $ 125.0 million aggregate principal amount of its 3.625 % Fixed-to-Floating Rate Subordinated Notes (the Notes) due December 1, 2030 . The Notes were sold at an underwriting discount of 1.2 %, resulting in net proceeds to Trustmark of $ 123.5 million before deducting offering expenses. At December 31, 2023 and 2022 , the carrying amount of the Notes was $ 123.5 million and $ 123.3 million, respectively. The Notes are unsecured obligations and are subordinated in right of payment to all of Trustmark’s existing and future senior indebtedness, whether secured or unsecured. The Notes are obligations of Trustmark only and are not obligations of, and are not guaranteed by, any of its subsidiaries, including TNB. From the date of issuance until November 30, 2025, the Notes bear interest at a fixed rate of 3.625 % per year, payable semi-annually in arrears on June 1 and December 1 of each year. Beginning December 1, 2025, the Notes will bear interest at a floating rate per year equal to the Benchmark rate, which is the Three-Month Term Secured Overnight Financing Rate (SOFR) , plus 338.7 basis points, payable quarterly in arrears on March 1, June 1, September 1 and December 1 of each year. The Notes qualify as Tier 2 capital for Trustmark. The Notes may be redeemed at Trustmark’s option under certain circumstances. Trustmark intends to use the net proceeds for general corporate purposes. Junior Subordinated Debt Securities On August 18, 2006, Trustmark completed a private placement of $ 60.0 million of trust preferred securities through a newly formed Delaware trust affiliate, Trustmark Preferred Capital Trust I (the Trust). The trust preferred securities mature September 30, 2036 , are redeemable at Trustmark’s option and bear interest at a variable rate per annum equal to the three-month Chicago Mercantile Exchange, Inc. (CME) SOFR plus a spread adjustment of 0.26 % and a margin of 1.72 %. Under applicable regulatory guidelines, these trust preferred securities qualify as Tier 1 capital. The proceeds from the sale of the trust preferred securities were used by the Trust to purchase $ 61.9 million in aggregate principal amount of Trustmark’s junior subordinated debentures. The debentures were issued pursuant to a Junior Subordinated Indenture, dated August 18, 2006, between Trustmark, as issuer, and Wilmington Trust Company, National Association, as trustee. Like the trust preferred securities, the debentures bear interest at a variable rate per annum equal to the three-month CME SOFR plus a spread adjustment of 0.26 % and a margin of 1.72 % and mature on September 30, 2036 . The debentures may be redeemed at Trustmark’s option at any time. The interest payments by Trustmark will be used to pay the quarterly distributions payable by the Trust to the holder of the trust preferred securities. However, so long as no event of default has occurred under the debentures, Trustmark may defer interest payments on the debentures (in which case the Trust will also defer distributions otherwise due on the trust preferred securities) for up to 20 consecutive quarters. The debentures are subordinated to the prior payment of any other indebtedness of Trustmark that, by its terms, is not similarly subordinated. The trust preferred securities are recorded as a long-term liability on Trustmark’s balance sheet; however, for regulatory purposes the trust preferred securities are treated as Tier 1 capital under the rules of the Federal Reserve Board (FRB), Trustmark’s primary federal regulatory agency. Trustmark also entered into a Guarantee Agreement, dated August 18, 2006, pursuant to which it has agreed to guarantee the payment by the Trust of distributions on the trust preferred securities and the payment of principal of the trust preferred securities when due, either at maturity or on redemption, but only if and to the extent that the Trust fails to pay distributions on or principal of the trust preferred securities after having received interest payments or principal payments on the junior subordinated debentures from Trustmark for the purpose of paying those distributions or the principal amount of the trust preferred securities. As defined in applicable accounting standards, the Trust, a wholly-owned subsidiary of Trustmark, is considered a variable interest entity for which Trustmark is not the primary beneficiary. Accordingly, the accounts of the Trust are not included in Trustmark’s consolidated financial statements. At both December 31, 2023 and 2022 , assets for the Trust totaled $ 61.9 million, resulting from the investment in junior subordinated debentures issued by Trustmark. Liabilities and shareholders’ equity for the Trust also totaled $ 61.9 million at both December 31, 2023 and 2022 , resulting from the issuance of trust preferred securities in the amount of $ 60.0 million as well as $ 1.9 million in common securities issued to Trustmark. During 2023 , net income for the Trust equaled $ 132 thousand resulting from interest income from the junior subordinated debt securities issued by Trustmark to the Trust, compared with net income of $ 66 thousand during 2022 and $ 36 thousand during 2021. Dividends issued to Trustmark by the Trust during 2023 totaled $ 132 thousand, compared to $ 66 thousand during 2022 and $ 36 thousand during 2021 .

Revenue from Contracts with Cus

Revenue from Contracts with Customers	12 Months Ended
	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Note 12 – Revenue from Contracts with Customers The following table presents noninterest income disaggregated by reportable operating segment and revenue stream for the periods presented ($ in thousands): Year Ended December 31, 2023 Year Ended December 31, 2022 Year Ended December 31, 2021 Topic 606 Not Topic (1) Total Topic 606 Not Topic (1) Total Topic 606 Not Topic (1) Total General Banking Service charges on $ 43,329 $ — $ 43,329 $ 42,073 $ — $ 42,073 $ 33,169 $ — $ 33,169 Bank card and other fees 30,387 2,995 33,382 31,474 4,584 36,058 30,897 3,727 34,624 Mortgage banking, net — 26,216 26,216 — 28,306 28,306 — 63,750 63,750 Wealth management 838 — 838 639 — 639 48 — 48 Other, net 11,769 ( 2,076 ) 9,693 8,469 805 9,274 6,621 ( 338 ) 6,283 Security gains (losses), — 39 39 — — — — — — Total noninterest $ 86,323 $ 27,174 $ 113,497 $ 82,655 $ 33,695 $ 116,350 $ 70,735 $ 67,139 $ 137,874 Wealth Management Service charges on $ 87 $ — $ 87 $ 84 $ — $ 84 $ 77 $ — $ 77 Bank card and other fees 57 — 57 47 — 47 38 — 38 Wealth management 34,254 — 34,254 34,374 — 34,374 35,142 — 35,142 Other, net 162 376 538 528 39 567 130 33 163 Total noninterest $ 34,560 $ 376 $ 34,936 $ 35,033 $ 39 $ 35,072 $ 35,387 $ 33 $ 35,420 Insurance Segment Insurance commissions $ 57,569 $ — $ 57,569 $ 53,721 $ — $ 53,721 $ 48,511 $ — $ 48,511 Other, net 956 — 956 1 — 1 105 — 105 Total noninterest $ 58,525 $ — $ 58,525 $ 53,722 $ — $ 53,722 $ 48,616 $ — $ 48,616 Consolidated Service charges on $ 43,416 $ — $ 43,416 $ 42,157 $ — $ 42,157 $ 33,246 $ — $ 33,246 Bank card and other fees 30,444 2,995 33,439 31,521 4,584 36,105 30,935 3,727 34,662 Mortgage banking, net — 26,216 26,216 — 28,306 28,306 — 63,750 63,750 Insurance commissions 57,569 — 57,569 53,721 — 53,721 48,511 — 48,511 Wealth management 35,092 — 35,092 35,013 — 35,013 35,190 — 35,190 Other, net 12,887 ( 1,700 ) 11,187 8,998 844 9,842 6,856 ( 305 ) 6,551 Security gains (losses), — 39 39 — — — — — — Total noninterest $ 179,408 $ 27,550 $ 206,958 $ 171,410 $ 33,734 $ 205,144 $ 154,738 $ 67,172 $ 221,910 (1) Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card 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 securities gains (losses), net.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Note 13 – Income Taxes The income tax provision included in the consolidated statements of income was as follows for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Current Federal $ 29,450 $ 15,377 $ 5,815 State 7,197 3,283 2,118 Deferred Federal ( 3,840 ) ( 13,440 ) 16,092 State ( 960 ) ( 3,360 ) 4,023 Income tax provision $ 31,847 $ 1,860 $ 28,048 For the periods presented, the income tax provision differs from the amount computed by applying the statutory federal income tax rate in effect for each respective period to income before income taxes as a result of the following ($ in thousands): Years Ended December 31, 2023 2022 2021 Income tax computed at statutory tax rate $ 41,441 $ 15,487 $ 36,837 Tax exempt interest ( 5,521 ) ( 4,419 ) ( 3,935 ) Nondeductible interest expense 2,104 271 106 State income taxes, net 5,686 2,596 1,673 Income tax credits, net ( 11,904 ) ( 10,071 ) ( 10,479 ) Death benefit gains ( 80 ) ( 287 ) ( 175 ) Other 121 ( 1,717 ) 4,021 Income tax provision $ 31,847 $ 1,860 $ 28,048 Temporary differences between the financial statement carrying amounts and the tax basis of assets and liabilities gave rise to the following net deferred tax assets at December 31, 2023 and 2022, which are included in other assets on the accompanying consolidated balance sheets ($ in thousands): December 31, 2023 2022 Deferred tax assets: Litigation losses $ 26,647 $ 25,187 Other real estate 1,743 70 Accumulated credit losses 43,473 39,370 Deferred compensation 17,893 17,695 Finance and operating lease liabilities 11,426 10,997 Realized built-in losses 8,429 9,180 Securities 68,223 84,813 Pension and other postretirement benefit plans 2,025 1,931 Interest on nonaccrual loans 1,218 1,159 LHFS 777 205 Stock-based compensation 3,196 2,647 Derivatives 2,993 5,056 Other 10,543 10,038 Gross deferred tax asset 198,586 208,348 Deferred tax liabilities: Goodwill and other identifiable intangibles 14,297 14,378 Premises and equipment 17,382 15,978 Finance and operating lease right-of-use assets 10,420 10,209 MSR 26,271 24,452 Securities 3,181 2,069 Other 2,264 2,876 Gross deferred tax liability 73,815 69,962 Net deferred tax asset $ 124,771 $ 138,386 The following table provides a summary of the changes during the calendar years presented in the amount of unrecognized tax benefits that are included in other liabilities in the consolidated balance sheet ($ in thousands): December 31, 2023 2022 2021 Balance at beginning of period $ 2,316 $ 2,129 $ 1,781 Change due to tax positions taken during the current year 1,333 653 412 Change due to tax positions taken during a prior year ( 426 ) ( 266 ) 107 Change due to the lapse of applicable statute of limitations during the ( 359 ) ( 200 ) ( 171 ) Balance at end of period $ 2,864 $ 2,316 $ 2,129 Accrued interest, net of federal benefit $ 470 $ 489 $ 419 Unrecognized tax benefits that would impact the effective $ 2,518 $ 1,948 $ 1,766 Interest and penalties related to unrecognized tax benefits, if any, are recorded in income tax expense. With limited exception, Trustmark is no longer subject to U.S. federal, state and local audits by tax authorities for 2017 and earlier tax years. Trustmark does not anticipate a significant change to the total amount of unrecognized tax benefits within the next twelve months.

Defined Benefit and Other Postr

Defined Benefit and Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2023
Retirement Benefits [Abstract]
Defined Benefit and Other Postretirement Benefits	Note 14 – 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 tables present information regarding the benefit obligation, plan assets, funded status, amounts recognized in accumulated other comprehensive loss, net periodic benefit cost and other statistical disclosures for the Continuing Plan for the periods presented ($ in thousands): December 31, 2023 2022 Change in benefit obligation: Benefit obligation, beginning of year $ 6,907 $ 8,647 Service cost 52 115 Interest cost 292 192 Actuarial (gain) loss 164 ( 1,882 ) Benefits paid ( 1,492 ) ( 165 ) Benefit obligation, end of year $ 5,923 $ 6,907 Change in plan assets: Fair value of plan assets, beginning of year $ 2,907 $ 2,900 Actual return on plan assets 237 ( 285 ) Employer contributions 751 457 Benefit payments ( 1,492 ) ( 165 ) Fair value of plan assets, end of year $ 2,403 $ 2,907 Funded status at end of year - net liability $ ( 3,520 ) $ ( 4,000 ) Amounts recognized in accumulated other comprehensive loss: Net (gain) loss - amount recognized $ ( 262 ) $ ( 271 ) Actuarial (gain) loss included in benefit obligation: Change in discount rate $ 124 $ ( 2,174 ) Change in mortality table ( 38 ) — Other 78 292 Actuarial (gain) loss $ 164 $ ( 1,882 ) Years Ended December 31, 2023 2022 2021 Net periodic benefit cost: Service cost $ 52 $ 115 $ 252 Interest cost 292 192 173 Expected return on plan assets ( 107 ) ( 121 ) ( 130 ) Recognized net loss due to lump sum settlements 25 — 183 Recognized net actuarial loss — 224 594 Net periodic benefit cost $ 262 $ 410 $ 1,072 Other changes in plan assets and benefit obligation recognized in other Net loss - Total recognized in other comprehensive income (loss) $ 9 $ ( 1,699 ) $ ( 1,136 ) Total recognized in net periodic benefit cost and other comprehensive $ 271 $ ( 1,289 ) $ ( 64 ) Weighted-average assumptions as of end of year: Discount rate for benefit obligation 4.67 % 4.88 % 2.41 % Discount rate for net periodic benefit cost 4.88 % 2.41 % 1.95 % Expected long-term return on plan assets 5.00 % 5.00 % 5.00 % Plan Assets The weighted-average asset allocations by asset category are presented below for the Continuing Plan at December 31, 2023 and 2022. December 31, 2023 2022 Money market fund 27.0 % 7.0 % Exchange traded funds: Equity securities 36.0 % 47.0 % Fixed income 28.0 % 39.0 % International 9.0 % 7.0 % Total 100.0 % 100.0 % The strategic objective of the investments of the assets in the Continuing Plan aims to provide long-term capital growth with moderate income. The allocation is managed on a total return basis with the average participant age in mind. It is constructed with an intermediate investment time frame with a moderate to high risk tolerance or a long-term investment time frame with a low to moderate risk tolerance. The plan allocation is typically balanced between equity and fixed income. The equity exposure has the potential to earn a return greater than inflation while the fixed income exposure may reduce the risk and volatility of the portfolio to which the equity allocation contributes. Fair Value Measurements 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. The following tables set forth by level, within the fair value hierarchy, the Continuing Plan’s assets measured at fair value at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 Total Level 1 Level 2 Level 3 Money market fund $ 643 $ 643 $ — $ — Exchange traded funds: Equity securities 861 861 — — Fixed income 690 690 — — International 209 209 — — Total assets at fair value $ 2,403 $ 2,403 $ — $ — December 31, 2022 Total Level 1 Level 2 Level 3 Money market fund $ 203 $ 203 $ — $ — Exchange traded funds: Equity securities 1,379 1,379 — — Fixed income 1,135 1,135 — — International 190 190 — — Total assets at fair value $ 2,907 $ 2,907 $ — $ — There have been no changes in the methodologies used in estimating the fair value of plan assets at December 31, 2023. The money market fund approximates fair value due to its immediate maturity. The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, although Trustmark believes their valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date. Contributions The range of potential contributions to the Continuing Plan is determined annually by the Continuing Plan’s actuary in accordance with applicable IRS rules and regulations. Trustmark’s policy is to fund amounts that are sufficient to satisfy the annual minimum funding requirements and do not exceed the maximum that is deductible for federal income tax purposes. The actual amount of the contribution is determined annually based on the Continuing Plan’s funded status and return on plan assets as of the measurement date, which is December 31. For the plan year ending December 31, 2023 , Trustmark’s minimum required contribution to the Continuing Plan was $ 154 thousand and Trustmark contributed $ 609 thousand. For the plan year ending December 31, 2024, Trustmark’s minimum required contribution to the Continuing Plan is expected to be $ 128 thousand. Management and the Board of Directors of Trustmark will monitor the Continuing Plan throughout 2024 to determine any additional funding requirements by the plan’s measurement date. Estimated Future Benefit Payments and Other Disclosures The following table presents the expected benefit payments, which reflect expected future service, for the Continuing Plan ($ in thousands): Year Amount 2024 $ 1,312 2025 682 2026 701 2027 724 2028 428 2029 - 2033 1,396 No net gain or loss is expected to be recognized as components of net periodic benefit cost during 2024 in accumulated other comprehensive income (loss). 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 nonqualified supplemental retirement plans, for which the plan benefits were frozen prior to the merger date. The following tables present information regarding the benefit obligation, plan assets, funded status, amounts recognized in accumulated other comprehensive loss, net periodic benefit cost and other statistical disclosures for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands): December 31, 2023 2022 Change in benefit obligation: Benefit obligation, beginning of year $ 43,201 $ 55,035 Service cost 69 71 Interest cost 2,013 1,278 Actuarial (gain) loss 763 ( 9,195 ) Benefits paid ( 4,427 ) ( 3,988 ) Benefit obligation, end of year $ 41,619 $ 43,201 Change in plan assets: Fair value of plan assets, beginning of year $ — $ — Employer contributions 4,427 3,988 Benefit payments ( 4,427 ) ( 3,988 ) Fair value of plan assets, end of year $ — $ — Funded status at end of year - net liability $ ( 41,619 ) $ ( 43,201 ) Amounts recognized in accumulated other comprehensive loss: Net loss $ 8,235 $ 7,756 Prior service cost 126 237 Amounts recognized $ 8,361 $ 7,993 Actuarial (gain) loss included in benefit obligation: Change in discount rate $ 649 $ ( 9,803 ) Change in mortality table ( 308 ) — Other 422 608 Actuarial (gain) loss $ 763 $ ( 9,195 ) Years Ended December 31, 2023 2022 2021 Net periodic benefit cost: Service cost $ 69 $ 71 $ 75 Interest cost 2,013 1,278 1,125 Amortization of prior service cost 111 111 111 Recognized net actuarial loss 284 986 1,192 Net periodic benefit cost $ 2,477 $ 2,446 $ 2,503 Other changes in plan assets and benefit obligation recognized in other Net (gain) loss $ 479 $ ( 10,181 ) $ ( 3,549 ) Amortization of prior service cost ( 111 ) ( 111 ) ( 111 ) Total recognized in other comprehensive income (loss) $ 368 $ ( 10,292 ) $ ( 3,660 ) Total recognized in net periodic benefit cost and other comprehensive $ 2,845 $ ( 7,846 ) $ ( 1,157 ) Weighted-average assumptions as of end of year: Discount rate for benefit obligation 4.67 % 4.88 % 2.41 % Discount rate for net periodic benefit cost 4.88 % 2.41 % 1.95 % Estimated Supplemental Retirement Plan Payments and Other Disclosures The following table presents the expected benefits payments for Trustmark’s supplemental retirement plans ($ in thousands): Year Amount 2024 $ 3,997 2025 3,871 2026 3,825 2027 3,641 2028 3,520 2029 - 2033 16,051 Amounts in accumulated other comprehensive income (loss) expected to be recognized as components of net periodic benefit cost during 2024 include a loss of $ 346 thousand and prior service cost of $ 111 thousand. Other Benefit Plans Defined Contribution Plan Trustmark provides associates with a self-directed 401(k) retirement plan that allows associates to contribute a percentage of eligible compensation, within limits provided by the Internal Revenue Code and accompanying regulations, into the plan. Trustmark matches 100 % of associate contributions to the plan based on the amount of each participant’s contributions up to a maximum of 6 % of eligible compensation, subject to the IRS maximum eligible compensation. Associates are automatically enrolled in the plan at 3 % of eligible compensation unless they opt out within 60 days of employment. Associates may become eligible to make elective deferral contributions the first of the month following one month of employment. Eligible associates that elect to participate vest immediately in Trustmark’s matching contributions. Trustmark’s contributions to this plan were $ 10.8 million in 2023, $ 10.2 million in 2022 and $ 9.9 million in 2021.

Stock and Incentive Compensatio

Stock and Incentive Compensation Plans	12 Months Ended
	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock and Incentive Compensation Plans	Note 15 – Stock and Incentive Compensation Plans Trustmark has granted restricted stock units subject to the provisions of the Stock and Incentive Compensation Plan (the Stock Plan). Current outstanding and future grants of restricted stock units 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. At December 31, 2023 , the maximum number of shares of Trustmark’s common stock available for issuance under the Stock Plan was 777,264 shares. Restricted Stock Grants Performance Units Trustmark’s performance units vest over three years and are granted to Trustmark’s executive and senior management teams. Performance units granted vest based on performance goals of return on average tangible equity and total shareholder return. Performance units are valued utilizing a Monte Carlo simulation model to estimate fair value of the awards at the grant date. The Monte Carlo simulation is performed by an independent valuation consultant and requires the use of subjective modeling assumptions. These units are recognized using the straight-line method over the requisite service period. These units provide for achievement units if performance measures exceed 100 %. The restricted stock agreement for these units provide for dividend privileges, but no voting rights. The following table summarizes Trustmark’s performance unit activity for the periods presented: Years Ended December 31, 2023 2022 2021 Weighted- Weighted- Weighted- Average Average Average Grant-Date Grant-Date Grant-Date Shares Fair Value Shares Fair Value Shares Fair Value Nonvested shares, beginning of year 148,416 $ 31.63 140,821 $ 31.80 145,042 $ 32.43 Granted 70,666 29.78 60,773 32.64 53,273 30.02 Released from restriction ( 39,943 ) 31.98 ( 19,723 ) 33.40 ( 44,536 ) 31.88 Forfeited ( 4,925 ) 31.41 ( 33,455 ) 33.11 ( 12,958 ) 31.28 Nonvested shares, end of year 174,214 $ 30.81 148,416 $ 31.63 140,821 $ 31.80 Time-based Units Trustmark’s time-based units granted to Trustmark’s executive and senior management teams vest over three years . Trustmark’s time-based units granted to members of Trustmark’s Board of Directors vest over one year . Time-based units are valued utilizing the fair value of Trustmark’s stock at the grant date. These units are recognized on the straight-line method over the requisite service period. The restricted stock agreement for these units provide for dividend privileges, but no voting rights . The following table summarizes Trustmark’s time-based unit activity for the periods presented: Years Ended December 31, 2023 2022 2021 Weighted- Weighted- Weighted- Average Average Average Grant-Date Grant-Date Grant-Date Shares Fair Value Shares Fair Value Shares Fair Value Nonvested shares, beginning of year 312,978 $ 30.99 337,466 $ 31.18 301,619 $ 32.24 Granted 145,003 28.59 133,307 31.85 180,847 29.85 Released from restriction ( 90,587 ) 30.90 ( 148,905 ) 32.16 ( 135,120 ) 31.77 Forfeited ( 9,142 ) 30.72 ( 8,890 ) 31.62 ( 9,880 ) 31.19 Nonvested shares, end of year 358,252 $ 30.04 312,978 $ 30.99 337,466 $ 31.18 The following table presents information regarding compensation expense for units under the Stock Plan for the periods presented ($ in thousands): At December 31, 2023 Recognized Compensation Expense Unrecognized Weighted Average for Years Ended December 31, Compensation Life of Unrecognized 2023 2022 2021 Expense Compensation Expense Performance awards $ 1,772 $ 1,258 $ 828 $ 2,021 1.69 Time-based awards 4,383 3,625 4,773 3,005 1.58 Total $ 6,155 $ 4,883 $ 5,601 $ 5,026

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 16 – Commitments and 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 December 31, 2023 and 2022 , Trustmark had unused commitments to extend credit of $ 4.907 billion and $ 5.472 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 December 31, 2023 and 2022 , Trustmark’s maximum exposure to credit loss in the event of nonperformance by the other party for letters of credit was $ 125.4 million and $ 144.1 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. At December 31, 2023 and 2022 , the fair value of collateral held was $ 31.4 million and $ 15.4 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 sheets. Changes in the ACL on off-balance sheet credit exposures were as follows for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Balance at beginning of period $ 36,838 $ 35,623 $ 38,572 PCL, off-balance sheet credit exposures ( 2,781 ) 1,215 ( 2,949 ) Balance at end of period $ 34,057 $ 36,838 $ 35,623 Adjustments to the ACL on off-balance sheet credit exposures are recorded to PCL, off-balance sheet credit exposures. The decrease in the ACL on off-balance sheet credit exposures for the year ended December 31, 2023 was primarily due to decreases in unfunded commitments for the construction, land development and other land portfolio and other construction loan portfolio. The increase in the ACL on off-balance sheet credit exposures for the year ended December 31, 2022 was primarily due to the overall increase in the total reserve rates applied to off-balance sheet credit exposures as a result of the weakening in the macroeconomic forecasts and an increase in unfunded balances. Legal Proceedings As previously announced, on December 31, 2022, Trustmark National Bank (TNB) agreed to a settlement in principle (the Stanford Settlement) relating to litigation involving the Stanford Financial Group. On January 13, 2023, TNB entered into a Settlement Agreement (the Stanford Settlement Agreement) reflecting the terms of the Stanford Settlement. The parties to the Stanford Settlement Agreement are, on the one hand, (i) Ralph S. Janvey, solely in his capacity as the court-appointed receiver (the Stanford Receiver) for the Stanford Receivership Estate; (ii) the Official Stanford Investors Committee; (iii) each of the plaintiffs in the Rotstain and Smith Actions; and, on the other hand, (iv) TNB. Under the terms of the Stanford Settlement Agreement, the parties agreed to settle and dismiss the Rotstain Action, the Smith Action, and all current or future claims by plaintiffs in either such Action arising from or related to Stanford. In addition, the Stanford Settlement Agreement provided that the parties would request dismissal of the Jackson Action pursuant to the terms of the bar orders described below. The Court’s approval of the Stanford Settlement Agreement, including the bar orders described below, has occurred and has been upheld on appeal, as described below. As a result, pursuant to the Stanford Settlement, TNB made a one-time cash payment of $ 100.0 million to the Stanford Receiver on February 2, 2024. The Stanford Settlement Agreement included the parties’ agreement to seek the Northern District of Texas District Court’s entry of bar orders prohibiting any continued or future claims by the plaintiffs in the Actions or by any other person or entity against TNB and its related parties relating to Stanford, whether asserted to date or not. The bar orders prohibit all litigation relating to Stanford described herein, including not only the Actions and any pending matters but also any actions that may be brought in the future. Final Court approval of these bar orders was a condition of the Stanford Settlement. The Stanford Settlement Agreement was also subject to notice to Stanford’s investor claimants (which has been provided) and final, non-appealable approval by the U.S. District Court for the Northern District of Texas (which has occurred). The Stanford Settlement Agreement also provides that TNB denies and makes no admission of liability or wrongdoing in connection with any Stanford matter. As has been the case throughout the pendency of the Actions, TNB expressly denies any liability or wrongdoing with respect to any matter alleged in regard to the multi-billion dollar Ponzi scheme operated by Stanford for almost 20 years. TNB’s relationship with Stanford began as a result of TNB’s acquisition of a Houston-based bank in August 2006, and consisted of ordinary banking services provided to business deposit customers. The foregoing description of the terms of the Stanford Settlement Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Stanford Settlement Agreement, a copy of which is filed as Exhibit 10.ai to the 2022 Annual Report and is incorporated herein by reference. On January 20, 2023, the U.S. District Court for the Northern District of Texas entered an order preliminarily finding that the Stanford Settlement is fair, reasonable, and equitable; has no obvious deficiencies; and is the product of serious, informed, good faith, and arm’s-length negotiations. Following the provision of notice as required by the Stanford Settlement Agreement and by the Court’s preliminary order, the Court (Judge David C. Godbey, presiding) held a Final Approval Hearing on May 3, 2023, at which the Court approved the Stanford Settlement from the bench. On May 4, 2023, Judge Godbey signed the written orders confirming his oral ruling, including the bar order contemplated by the Stanford Settlement Agreement and the judgment and bar order with respect to the Jackson Action. On May 10, 2023, Robert Allen Stanford, writing from prison, appealed the District Court’s approval of the Stanford Settlement to the Fifth Circuit Court of Appeals. On June 12, 2023, the Stanford Receiver moved to dismiss the appeal as frivolous. On July 25, 2023, a three-judge panel of the Fifth Circuit issued a per curiam order dismissing Stanford’s appeal as frivolous. In July and August 2023, Mr. Stanford filed, then subsequently withdrew, a motion seeking panel rehearing of the Fifth Circuit’s July 25, 2023, decision. When Stanford’s deadline to appeal the Fifth Circuit’s ruling to the Supreme Court of the United States passed without his filing a petition for certiorari, the trial court’s ruling approving the Stanford Settlement and entering the bar orders became final and non-appealable, as defined in the Stanford Settlement Agreement (the Stanford Settlement Effective Date). On November 14, the parties to the Rotstain and Smith Actions filed agreed dismissals of those cases, which were granted on November 27, 2023 (Smith Action) and December 18, 2023 (Rotstain Action). Those dismissals were final and non-appealable as of December 27, 2023 (Smith Action) and January 17, 2024 (Rotstain Action). Accordingly, pursuant to the Stanford Settlement Agreement, TNB made the settlement payment on February 2, 2024, concluding the Stanford Settlement. TNB and Trustmark Corporation determined that it was in the best interest of TNB, Trustmark Corporation and the shareholders of Trustmark Corporation to enter into the Stanford Settlement and the Stanford Settlement Agreement to eliminate the risk, ongoing expense, uncertainty as to ultimate outcome, and imposition on management and the business of TNB of further litigation of the Actions and related Stanford claims. As previously announced, on August 30, 2023, TNB agreed to a settlement in principle (the Adams/Madison Timber Settlement) relating to litigation and claims involving Arthur Lamar Adams and Madison Timber Properties, LLC (collectively, Adams/Madison Timber). On October 9, 2023, TNB entered into a Settlement Agreement (the Adams/Madison Timber Settlement Agreement) reflecting the terms of the Adams/Madison Timber Settlement. The parties to the Adams/Madison Timber Settlement are, on the one hand, Alysson Mills in her capacity as Court-appointed Receiver (the Adams/Madison Timber Receiver); and, on the other hand, TNB. Under the terms of the Adams/Madison Timber Settlement Agreement, the parties agreed to settle and dismiss the Adams/Madison Timber Action, and the Adams/Madison Timber Receiver agreed to fully release all claims against TNB and any of its employees, agents and representatives. The Adams/Madison Timber Settlement included the parties’ agreement to seek the Court’s entry of bar orders prohibiting any continued or future claims by anyone against TNB and its related parties relating to Adams/Madison Timber, whether asserted to date or not. Final Court approval of a bar order was a condition of the Adams/Madison Timber Settlement. On November 14, 2023, the Court entered a Partial Final Judgment and Final Bar Order approving the settlement. The bar order therefore is expected to prohibit all litigation relating to Adams/Madison Timber described herein. The Adams/Madison Timber Settlement was subject to notice to Adams/Madison Timber investors, and final, non-appealable approval by the Court and entry of a judgment dismissing the Lawsuit against TNB. No investor or other interested parties appealed the bar order before the appeal deadline passed. Accordingly, TNB made the settlement payment to the Adams/Madison Timber Receiver on January 22, 2024, concluding the Adams/Madison Timber Settlement. 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 are being vigorously contested, with the exception of the TD Bank Declaratory Action that, as noted above, TNB was not served in connection with. In accordance with FASB ASC Subtopic 450-20, “Loss Contingencies,” TNB will establish an accrued liability for any litigation matter if and when such matter presents loss contingencies that are both probable and reasonably estimable. As a result of the entry into the Stanford Settlement as described above, Trustmark Corporation recognized a $ 100.0 million litigation settlement expense included in noninterest expense related to the Stanford litigation during the fourth quarter of 2022, plus an additional $ 750 thousand in related legal fees. As a result of the entry into the Adams/Madison Timber Settlement as described above, Trustmark Corporation recognized a $ 6.5 million litigation settlement expense included in noninterest expense related to the Adams/Madison Timber litigation during the third quarter of 2023. Trustmark Corporation and TNB will remain substantially above levels considered to be well-capitalized under all relevant standards. At the present time, TNB believes, based on its evaluation and the advice of legal counsel, that a loss in any currently pending legal proceeding other than the settled Stanford and Adams/Madison Timber litigation is not probable and a reasonable estimate cannot reasonably be made.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2023
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Note 17 – 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 this 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 2.5 %. Accumulated other comprehensive income (loss), net of tax, is not included in computing regulatory capital. Trustmark 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. At December 31, 2023, Trustmark and TNB exceeded all applicable minimum capital standards. In addition, Trustmark and TNB met applicable regulatory guidelines to be considered well-capitalized at December 31, 2023. To be categorized in this manner, Trustmark and TNB maintained 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 December 31, 2023, 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 December 31, 2023 and 2022 ($ in thousands): Actual Regulatory Capital Minimum To Be Well Amount Ratio Requirement Capitalized At December 31, 2023: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,521,665 10.04 % 7.000 % n/a Trustmark National Bank 1,602,327 10.58 % 7.000 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,581,665 10.44 % 8.500 % n/a Trustmark National Bank 1,602,327 10.58 % 8.500 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,862,246 12.29 % 10.500 % n/a Trustmark National Bank 1,759,426 11.61 % 10.500 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,581,665 8.62 % 4.00 % n/a Trustmark National Bank 1,602,327 8.75 % 4.00 % 5.00 % At December 31, 2022: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,413,672 9.74 % 7.000 % n/a Trustmark National Bank 1,501,889 10.34 % 7.000 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,473,672 10.15 % 8.500 % n/a Trustmark National Bank 1,501,889 10.34 % 8.500 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,729,499 11.91 % 10.500 % n/a Trustmark National Bank 1,634,454 11.26 % 10.500 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,473,672 8.47 % 4.00 % n/a Trustmark National Bank 1,501,889 8.65 % 4.00 % 5.00 % Dividends on Common Stock Dividends paid by Trustmark are substantially funded from dividends received from TNB. Approval by TNB’s regulators is required if the total of all dividends declared in any calendar year exceeds the total of its net income for that year combined with its retained net income of the preceding two years . In 2024, TNB will have available approximately $ 95.1 million plus its net income for that year to pay as dividends. Stock Repurchase Program On January 28, 2020, the Board of Directors of Trustmark authorized a stock repurchase program effective April 1, 2020 under which $ 100.0 million of Trustmark’s outstanding common stock could be acquired through December 31, 2021. Under this authority, Trustmark repurchased approximately 1.9 million shares of its outstanding common stock valued at $ 61.8 million during the year ended December 31, 2021. On December 7, 2021, Trustmark’s Board of Directors authorized a stock repurchase program effective January 1, 2022, under which $ 100.0 million of Trustmark’s outstanding shares could be acquired through December 31, 2022. Under this authority, Trustmark repurchased approximately 789 thousand shares of its common stock valued at $ 24.6 million during the twelve months ended December 31, 2022. On December 6, 2022 , Trustmark’s Board of Directors authorized a stock repurchase program effective January 1, 2023, under which $ 50.0 million of Trustmark’s outstanding shares could be acquired through December 31, 2023. No shares were repurchased under this stock repurchase program. On December 5, 2023 , Trustmark’s Board of Directors authorized a stock repurchase program effective January 1, 2024, under which $ 50.0 million of Trustmark’s outstanding shares may be acquired through December 31, 2024. The repurchase program, which is subject to market conditions and management discretion, will be implemented through open market repurchases or privately negotiated transactions. No shares have been repurchased under this stock repurchase program. 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 years ended December 31, 2023, 2022 and 2021 ($ 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 14 – 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. Reclassification adjustments related to the cash flow hedge derivatives are included in interest and fees on LHFS and LHFI in the accompanying consolidated statements of income. Before Tax Tax (Expense) Net of Tax Amount Benefit Amount Year Ended December 31, 2023 Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising during the period $ 50,537 $ ( 12,404 ) $ 38,133 Reclassification adjustment for net (gains) losses realized in net income ( 39 ) 10 ( 29 ) Change in net unrealized holding loss on securities transferred to held to maturity 15,557 ( 3,889 ) 11,668 Total securities available for sale and transferred securities 66,055 ( 16,283 ) 49,772 Pension and other postretirement benefit plans: Change in the actuarial loss of pension and other postretirement ( 691 ) 173 ( 518 ) Reclassification adjustments for changes realized in net income: Net change in prior service costs 111 ( 28 ) 83 Recognized net loss due to lump sum settlements 25 ( 6 ) 19 Change in net actuarial loss 177 ( 44 ) 133 Total pension and other postretirement benefit plans ( 378 ) 95 ( 283 ) Cash flow hedge derivatives: Change in accumulated gain (loss) on effective cash flow hedge derivatives ( 8,131 ) 2,033 ( 6,098 ) Reclassification adjustment for (gain) loss realized in net income 16,385 ( 4,096 ) 12,289 Total cash flow hedge derivatives 8,254 ( 2,063 ) 6,191 Total other comprehensive income (loss) $ 73,931 $ ( 18,251 ) $ 55,680 Year Ended December 31, 2022 Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising during the period $ ( 229,524 ) $ 57,381 $ ( 172,143 ) Change in net unrealized holding loss on securities transferred to held to maturity ( 86,033 ) 21,508 ( 64,525 ) Total securities available for sale and transferred securities ( 315,557 ) 78,889 ( 236,668 ) Pension and other postretirement benefit plans: Change in the actuarial loss of pension and other postretirement 10,792 ( 2,698 ) 8,094 Reclassification adjustments for changes realized in net income: Net change in prior service costs 111 ( 28 ) 83 Change in net actuarial loss 1,089 ( 272 ) 817 Total pension and other postretirement benefit plans 11,992 ( 2,998 ) 8,994 Cash flow hedge derivatives: Change in accumulated gain (loss) on effective cash flow hedge derivatives ( 20,685 ) 5,171 ( 15,514 ) Reclassification adjustment for (gain) loss realized in net income 460 ( 115 ) 345 Total cash flow hedge derivatives ( 20,225 ) 5,056 ( 15,169 ) Total other comprehensive income (loss) $ ( 323,790 ) $ 80,947 $ ( 242,843 ) Year Ended December 31, 2021 Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising during the period $ ( 49,454 ) $ 12,364 $ ( 37,090 ) Change in net unrealized holding loss on securities transferred to held to maturity 2,647 ( 662 ) 1,985 Total securities available for sale and transferred securities ( 46,807 ) 11,702 ( 35,105 ) Pension and other postretirement benefit plans: Change in the actuarial loss of pension and other postretirement 2,845 ( 711 ) 2,134 Reclassification adjustments for changes realized in net income: Net change in prior service costs 111 ( 27 ) 84 Recognized net loss due to lump sum settlements 183 ( 46 ) 137 Change in net actuarial loss 1,655 ( 414 ) 1,241 Total pension and other postretirement benefit plans 4,794 ( 1,198 ) 3,596 Total other comprehensive income (loss) $ ( 42,013 ) $ 10,504 $ ( 31,509 ) 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 for Sale Transferred Defined Cash Flow Hedge Derivative Total Balance, January 1, 2021 $ 17,331 $ ( 18,382 ) $ — $ ( 1,051 ) Other comprehensive income (loss) before ( 35,105 ) 2,134 — ( 32,971 ) Amounts reclassified from accumulated other — 1,462 — 1,462 Net other comprehensive income (loss) ( 35,105 ) 3,596 — ( 31,509 ) Balance, December 31, 2021 ( 17,774 ) ( 14,786 ) — ( 32,560 ) Other comprehensive income (loss) before ( 236,668 ) 8,094 ( 15,514 ) ( 244,088 ) Amounts reclassified from accumulated other — 900 345 1,245 Net other comprehensive income (loss) ( 236,668 ) 8,994 ( 15,169 ) ( 242,843 ) Balance, December 31, 2022 ( 254,442 ) ( 5,792 ) ( 15,169 ) ( 275,403 ) Other comprehensive income (loss) before reclassification 49,801 ( 518 ) ( 6,098 ) 43,185 Amounts reclassified from accumulated other ( 29 ) 235 12,289 12,495 Net other comprehensive income (loss) 49,772 ( 283 ) 6,191 55,680 Balance, December 31, 2023 $ ( 204,670 ) $ ( 6,075 ) $ ( 8,978 ) $ ( 219,723 )

Fair Value

Fair Value	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value	Note 18 – 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., “deliverable”) for a corresponding security observed in the marketplace. 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 December 31, 2023 and 2022, 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 years ended December 31, 2023 and 2022. December 31, 2023 Total Level 1 Level 2 Level 3 U.S. Treasury securities $ 372,368 $ 372,368 $ — $ — U.S. Government agency obligations 5,792 — 5,792 — Obligations of states and political subdivisions — — — — Mortgage-backed securities 1,384,718 — 1,384,718 — Securities available for sale 1,762,878 372,368 1,390,510 — LHFS 184,812 — 184,812 — MSR 131,870 — — 131,870 Other assets - derivatives 23,316 7,685 14,786 845 Other liabilities - derivatives 35,600 21 35,579 — December 31, 2022 Total Level 1 Level 2 Level 3 U.S. Treasury securities $ 391,513 $ 391,513 $ — $ — U.S. Government agency obligations 7,766 — 7,766 — Obligations of states and political subdivisions 4,862 — 4,862 — Mortgage-backed securities 1,619,941 — 1,619,941 — Securities available for sale 2,024,082 391,513 1,632,569 — LHFS 135,226 — 135,226 — MSR 129,677 — — 129,677 Other assets - derivatives 8,871 54 8,660 157 Other liabilities - derivatives 45,379 474 44,905 — The changes in Level 3 assets measured at fair value on a recurring basis for the years ended December 31, 2023 and 2022 are summarized as follows ($ in thousands): MSR Other Assets - Balance, January 1, 2023 $ 129,677 $ 157 Total net (loss) gain included in Mortgage banking, net (1) ( 11,519 ) 2,470 Additions 13,712 — Sales — ( 1,782 ) Balance, December 31, 2023 $ 131,870 $ 845 The amount of total gains (losses) for the period included in earnings that are $ ( 1,489 ) $ 1,103 Balance, January 1, 2022 $ 87,687 $ 1,859 Total net (loss) gain included in Mortgage banking, net (1) 24,147 ( 131 ) Additions 17,843 — Sales — ( 1,571 ) Balance, December 31, 2022 $ 129,677 $ 157 The amount of total gains (losses) for the period included in earnings that are $ 38,181 $ ( 1,214 ) (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 December 31, 2023, 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 December 31, 2023 , Trustmark had outstanding balances of $ 49.1 million with a related ACL of $ 12.4 million in collateral-dependent LHFI, compared to outstanding balances of $ 40.3 million with a related ACL of $ 17.7 million in collateral-dependent LHFI at December 31, 2022. 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 $ 898 thousand were re-measured during 2023 , requiring write-downs of $ 243 thousand to reach their current fair values compared to $ 3.0 million of foreclosed assets that were re-measured during 2022 , requiring write-downs of $ 1.0 million. Fair Value of Financial Instruments FASB ASC Topic 825 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 December 31, 2023 and 2022 were as follows ($ in thousands): December 31, 2023 December 31, 2022 Carrying Estimated Carrying Estimated Financial Assets: Level 2 Inputs: Cash and short-term investments $ 975,543 $ 975,543 $ 738,787 $ 738,787 Securities held to maturity 1,426,279 1,355,504 1,494,514 1,406,589 Level 3 Inputs: Net LHFI 12,811,157 12,762,505 12,083,825 11,850,318 Financial Liabilities: Level 2 Inputs: Deposits 15,569,763 15,553,417 14,437,648 14,404,661 Federal funds purchased and securities sold under 405,745 405,745 449,331 449,331 Other borrowings 483,230 483,226 1,050,938 1,050,932 Subordinated notes 123,482 108,125 123,262 113,125 Junior subordinated debt securities 61,856 46,856 61,856 46,392 Fair Value Option Trustmark has elected to account for its LHFS under the fair value option, with interest income on these LHFS reported in interest and fees on LHFS and LHFI. The fair value of the LHFS is determined using quoted prices for a similar asset, adjusted for specific attributes of that loan. The 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 the LHFS are largely offset by changes in the fair value of the derivative instruments. For the year ended December 31, 2023 , a net gain of $ 2.2 million was recorded as noninterest income in mortgage banking, net for changes in the fair value of the LHFS accounted for under the fair value option compared to net losses of $ 3.3 million and $ 10.3 million, respectively, for the years ended December 31, 2022 and 2021. Interest and fees on LHFS and LHFI for the year ended December 31, 2023 included $ 7.8 million of interest earned on the LHFS accounted for under the fair value option compared to $ 6.8 million and $ 7.0 million for the years ended December 31, 2022 and 2021 , 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 the 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 $ 78.8 million and $ 70.8 million at December 31, 2023 and 2022, respectively, and are included in LHFS on the accompanying consolidated balance sheets. The following table provides information about the fair value and the contractual principal outstanding of the LHFS accounted for under the fair value option at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 2022 Fair value of LHFS $ 105,974 $ 64,421 LHFS contractual principal outstanding 102,994 63,427 Fair value less unpaid principal $ 2,980 $ 994

Derivative Financial Instrument

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Note 19 – Derivative Financial Instruments Derivatives Designated as Hedging Instruments During the third quarter of 2022, Trustmark initiated a cash flow hedging program. Trustmark's objectives in initiating this hedging program were to add stability to interest income and to manage its exposure to interest rate movements. Interest rate swaps designated as cash flow hedges involve the receipt of fixed-rate amounts from a counterparty in exchange for Trustmark making variable-rate payments over the life of the agreements without exchange of the underlying notional amount. Interest rate floor spreads designated as cash flow hedges involve the receipt of variable-rate amounts if interest rates fall below the purchased floor strike rate on the contract and payments of variable-rate amounts if interest rates fall below the sold floor strike rate on the contract. Trustmark uses such derivatives to hedge the variable cash flows associated with existing and anticipated variable-rate loan assets. At December 31, 2023 , the aggregate notional value of Trustmark's interest rate swaps and floor spreads designated as cash flow hedges totaled $ 1.125 billion compared to $ 825.0 million at December 31, 2022. Trustmark records any gains or losses on these cash flow hedges in accumulated other comprehensive income (loss). Gains and losses on derivatives representing hedge components excluded from the assessment of effectiveness are recognized over the life of the hedge on a systematic and rational basis, as documented at hedge inception in accordance with Trustmark’s accounting policy election. The earnings recognition of excluded components totaled $ 57 thousand of amortization expense for the year ended 2023 and is included in interest and fees on LHFS and LHFI. As interest payments are received on Trustmark's variable-rate assets, amounts reported in accumulated other comprehensive income (loss) are reclassified into interest and fees on LHFS and LHFI in the accompanying consolidated statements of income during the same period. During the next twelve months, Trustmark estimates that $ 13.2 million will be reclassified as a reduction to interest and fees on LHFS and LHFI. This amount could differ due to changes in interest rates, hedge de-designations or the addition of other hedges. 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 $ 285.0 million at December 31, 2023 compared to $ 277.0 million at December 31, 2022 . 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 negative ineffectiveness of $ 6.3 million and a net negative ineffectiveness of $ 4.1 million for the years ended December 31, 2023 and 2022, respectively, compared a net positive ineffectiveness of $ 2.5 million for the year ended December 31, 2021. 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 $ 109.5 million at December 31, 2023 , with a negative valuation adjustment of $ 994 thousand, compared to $ 97.0 million at December 31, 2022 , with a positive valuation adjustment of $ 168 thousand. 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 $ 61.9 million at December 31, 2023 , with a positive valuation adjustment of $ 845 thousand, compared to $ 68.4 million at December 31, 2022 , with a positive valuation adjustment of $ 157 thousand. 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 offsetting interest rate swap transactions are either cleared through the Chicago Mercantile Exchange for clearable transactions or booked directly with institutional derivatives market participants for non-clearable transactions. 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 December 31, 2023 , Trustmark had interest rate swaps with an aggregate notional amount of $ 1.500 billion related to this program, compared to $ 1.391 billion at December 31, 2022. 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 December 31, 2023 , 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 $ 1.4 million compared to none at December 31, 2022. At December 31, 2023 and 2022 , Trustmark had posted collateral of $ 2.0 million and $ 740 thousand, respectively, against its obligations because of negotiated thresholds and minimum transfer amounts under these agreements. If Trustmark had breached any of these triggering provisions at December 31, 2023, 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 December 31, 2023 , Trustmark had entered into six risk participation agreements as a beneficiary with an aggregate notional amount of $ 40.1 million compared to five risk participation agreements as a beneficiary with an aggregate notional amount of $ 50.2 million at December 31, 2022. At December 31, 2023 , Trustmark had entered into thirty-five risk participation agreements as a guarantor with aggregate notional amounts of $ 304.7 million compared to twenty-nine risk participation agreements as a guarantor with aggregate notional amounts of $ 235.8 million at December 31, 2022. The aggregate fair values of these risk participation agreements were immaterial at December 31, 2023 and 2022. Tabular Disclosures The following tables disclose the fair value of derivative instruments in Trustmark’s consolidated balance sheets at December 31, 2023 and 2022 as well as the effect of these derivative instruments on Trustmark’s results of operations for the periods presented ($ in thousands): December 31, 2023 2022 Derivatives in hedging relationships Interest rate contracts: Interest rate swaps included in other assets (1) $ 1,182 $ — Interest rate floors included in other assets 1,689 — Interest rate swaps included in other liabilities (1) 267 761 Derivatives not designated as hedging instruments Interest rate contracts: Exchange traded purchased options included in other assets $ 180 $ 38 OTC written options (rate locks) included in other assets 845 157 Futures contracts included in other assets 7,505 16 Interest rate swaps included in other assets (1) 11,910 8,654 Credit risk participation agreements included in other assets 5 6 Futures contracts included in other liabilities — 268 Forward contracts included in other liabilities 994 ( 168 ) Exchange traded written options included in other liabilities 21 206 Interest rate swaps included in other liabilities (1) 34,255 44,304 Credit risk participation agreements included in other liabilities 63 8 (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. Years Ended December 31, 2023 2022 2021 Derivatives in hedging relationships Amount of gain (loss) reclassified from accumulated other $ ( 16,385 ) $ ( 460 ) $ — Derivatives not designated as hedging instruments Amount of gain (loss) recognized in mortgage banking, net $ ( 5,281 ) $ ( 43,764 ) $ ( 15,436 ) Amount of gain (loss) recognized in bank card and other fees 271 403 1,649 The following table discloses the amount included in other comprehensive income (loss), net of tax, for derivative instruments designated as cash flow hedges for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Derivatives in cash flow hedging relationship Amount of gain (loss) recognized in other comprehensive $ ( 6,098 ) $ ( 15,514 ) $ — Information about financial instruments that are eligible for offset in the consolidated balance sheets at December 31, 2023 and 2022 is presented in the following tables ($ in thousands): Offsetting of Derivative Assets As of December 31, 2023 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts of Financial Cash Collateral Net Amount Derivatives $ 14,781 $ — $ 14,781 $ ( 4,339 ) $ — $ 10,442 Offsetting of Derivative Liabilities As of December 31, 2023 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts of Financial Cash Collateral Net Amount Derivatives $ 34,522 $ — $ 34,522 $ ( 4,339 ) $ ( 2,040 ) $ 28,143 Offsetting of Derivative Assets As of December 31, 2022 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts of the Statement of Financial Cash Collateral Net Amount Derivatives $ 9,415 $ — $ 9,415 $ — $ ( 2,230 ) $ 7,185 Offsetting of Derivative Liabilities As of December 31, 2022 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts of Financial Cash Collateral Net Amount Derivatives $ 44,304 $ — $ 44,304 $ — $ ( 740 ) $ 43,564

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Segment Information	Note 20 – Segment Information Trustmark’s management reporting structure includes three segments: General Banking, Wealth Management and Insurance. The General Banking Segment is responsible for all traditional banking products and services, including loans and deposits. The General Banking Segment also consists of internal operations such as Human Resources, Executive Administration, Treasury (Funds Management), Public Affairs and Corporate Finance. The Wealth Management Segment provides customized solutions for customers by integrating financial services with traditional banking products and services such as money management, full-service brokerage, financial planning, personal and institutional trust and retirement services. Through FBBI, Trustmark’s Insurance Segment provides a full range of retail insurance products including commercial risk management products, bonding, group benefits and personal lines coverage. 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): Years Ended December 31, 2023 2022 2021 General Banking Net interest income $ 547,010 $ 489,398 $ 413,201 PCL 26,716 22,913 ( 24,439 ) Noninterest income 113,497 116,350 137,874 Noninterest expense 463,496 531,397 421,561 Income before income taxes 170,295 51,438 153,953 Income taxes 25,091 ( 3,683 ) 22,706 General banking net income $ 145,204 $ 55,121 $ 131,247 Selected Financial Information Total assets $ 18,440,198 $ 17,710,673 $ 17,275,438 Depreciation and amortization $ 34,924 $ 38,909 $ 44,776 Wealth Management Net interest income $ 5,879 $ 5,321 $ 5,161 PCL ( 2,135 ) ( 21 ) ( 9 ) Noninterest income 34,936 35,072 35,420 Noninterest expense 32,339 32,873 31,721 Income before income taxes 10,611 7,541 8,869 Income taxes 2,653 1,870 2,219 Wealth Management net income $ 7,958 $ 5,671 $ 6,650 Selected Financial Information Total assets $ 185,342 $ 214,313 $ 232,997 Depreciation and amortization $ 261 $ 288 $ 269 Insurance Net interest income $ ( 11 ) $ ( 11 ) $ ( 11 ) Noninterest income 58,525 53,722 48,616 Noninterest expense 42,084 38,943 36,014 Income before income taxes 16,430 14,768 12,591 Income taxes 4,103 3,673 3,123 Insurance net income $ 12,327 $ 11,095 $ 9,468 Selected Financial Information Total assets $ 96,649 $ 90,492 $ 87,201 Depreciation and amortization $ 571 $ 685 $ 768 Consolidated Net interest income $ 552,878 $ 494,708 $ 418,351 PCL 24,581 22,892 ( 24,448 ) Noninterest income 206,958 205,144 221,910 Noninterest expense 537,919 603,213 489,296 Income before income taxes 197,336 73,747 175,413 Income taxes 31,847 1,860 28,048 Consolidated net income $ 165,489 $ 71,887 $ 147,365 Selected Financial Information Total assets $ 18,722,189 $ 18,015,478 $ 17,595,636 Depreciation and amortization $ 35,756 $ 39,882 $ 45,813

Parent Company Only Financial I

Parent Company Only Financial Information	12 Months Ended
	Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract]
Parent Company Only Financial Information	Note 21 – Parent Company Only Financial Information ($ in thousands) Condensed Balance Sheets December 31, 2023 2022 Assets: Investment in banks $ 1,770,392 $ 1,602,169 Other assets 77,901 76,325 Total Assets $ 1,848,293 $ 1,678,494 Liabilities and Shareholders' Equity: Accrued expense $ 1,108 $ 1,108 Subordinated notes 123,482 123,262 Junior subordinated debt securities 61,856 61,856 Shareholders' equity 1,661,847 1,492,268 Total Liabilities and Shareholders' Equity $ 1,848,293 $ 1,678,494 Condensed Statements of Income Years Ended December 31, 2023 2022 2021 Revenue: Dividends received from banks $ 67,189 $ 89,733 $ 45,284 Earnings of subsidiaries over distributions 106,388 ( 11,269 ) 108,141 Other income 163 94 95 Total Revenue 173,740 78,558 153,520 Expense: Other expense 8,251 6,671 6,155 Total Expense 8,251 6,671 6,155 Net Income $ 165,489 $ 71,887 $ 147,365 Condensed Statements of Cash Flows Years Ended December 31, 2023 2022 2021 Operating Activities: Net income $ 165,489 $ 71,887 $ 147,365 Adjustments to reconcile net income to net cash provided Net change in investment in subsidiaries ( 106,388 ) 11,269 ( 108,141 ) Other ( 797 ) ( 1,550 ) ( 2,078 ) Net cash from operating activities 58,304 81,606 37,146 Financing Activities: Common stock dividends ( 56,653 ) ( 56,679 ) ( 58,085 ) Repurchase and retirement of common stock — ( 24,604 ) ( 61,799 ) Net cash from financing activities ( 56,653 ) ( 81,283 ) ( 119,884 ) Net change in cash and cash equivalents 1,651 323 ( 82,738 ) Cash and cash equivalents at beginning of year 75,860 75,537 158,275 Cash and cash equivalents at end of year $ 77,511 $ 75,860 $ 75,537 Trustmark paid income taxes of approximately $ 38.8 million in 2023 , $ 2.7 million in 2022 and $ 15.3 million in 2021 . Trustmark (parent company only) paid interest of $ 4.5 million of interest paid in both 2023 and 2022 and $ 4.6 million in 2021 .

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Business	Business 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 offices in Alabama (includes the Georgia Loan Production Office), Florida, Mississippi, Tennessee and Texas.
Basis of Financial Statement Presentation	Basis of Financial Statement Presentation 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 consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (GAAP). 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 2024 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.
Securities	Securities Securities are classified as either held to maturity or available for sale. Securities are classified as held to maturity and carried at amortized cost when Management has the positive intent and the ability to hold them until maturity. Securities to be held for indefinite periods of time are classified as available for sale and carried at fair value, with the unrealized holding gains and losses reported as a component of other comprehensive income (loss), net of tax. Securities available for sale are used as part of Trustmark’s interest rate risk management strategy and may be sold in response to changes in interest rates, changes in prepayment rates and other factors. Management determines the appropriate classification of securities at the time of purchase. The amortized cost of debt securities classified as securities held to maturity or securities available for sale is adjusted for amortization of premiums and accretion of discounts to maturity of the security using the interest method. Such amortization or accretion is included in interest on securities. Realized gains and losses are determined using the specific identification method and are included in noninterest income as securities gains (losses), net. Securities transferred from the available for sale category to the held to maturity category are recorded at fair value at the date of transfer. Unrealized holding gains or losses associated with the transfer of securities from available for sale to held to maturity are included in the balance of accumulated other comprehensive income (loss), net of tax, in the consolidated balance sheets. These unrealized holding gains or losses are amortized over the remaining life of the security as a yield adjustment in a manner consistent with the amortization or accretion of the original purchase premium or discount on the associated security. Allowance for Credit Losses (ACL) Financial Accounting Standards Board (FASB) Accounting Standard Codification (ASC) Topic 326 requires a current expected credit losses methodology for estimating allowances for credit losses and applies to all financial instruments carried at amortized cost, including securities held to maturity, and makes targeted improvements to the accounting for credit losses on securities available for sale. Under FASB ASC Topic 326, the ACL is an estimate measured using relevant information about past events, including historical credit loss experience on financial assets with similar risk characteristics, current conditions, and reasonable and supportable forecasts that affect the collectability of the remaining cash flows over the contractual term of the financial assets. Trustmark adopted a zero-credit loss assumption for certain classes of securities. This zero-credit loss assumption applies to debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government. The reasons behind the adoption of the zero-credit loss assumption were as follows: • High credit rating • Long history with no credit losses • Guaranteed by a sovereign entity • Widely recognized as “risk-free rate” • Ability and authority to print its own currency • Currency is routinely held by central banks, used in international commerce, and commonly viewed as reserve currency • Currently under the U.S. Government conservatorship or receivership Trustmark continuously monitors any changes in economic conditions, credit downgrades, changes to explicit or implicit guarantees granted to certain debt issuers, and any other relevant information that would indicate potential credit deterioration and prompt Trustmark to reconsider its zero-credit loss assumption. Securities Available for Sale FASB ASC Subtopic 326-30, “Financial Instruments-Credit Losses-Available-for-Sale Debt Securities,” replaced the concept of other-than-temporarily impaired with the ACL. Unlike securities held to maturity, securities available for sale are evaluated on an individual level and pooling of securities is not allowed. 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 as outlined below: • Review the extent to which the fair value is less than the amortized cost and observe the security’s lowest credit rating as reported by third-party credit ratings companies. • The securities that violate the credit loss triggers above would be subjected to additional analysis that may include, but is not limited to: changes in market interest rates, changes in securities credit ratings, security type, service area economic factors, financial performance of the issuer/or obligor of the underlying issue and third-party guarantee. • If Trustmark determines that a credit loss exists, the credit portion of the allowance will be 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). Accrued interest receivable is excluded from the estimate of credit losses for securities available for sale and reported in other assets on the consolidated balance sheets. Securities Held to Maturity FASB ASC Subtopic 326-20, “Financial Instruments-Credit Losses-Measured at Amortized Cost,” requires institutions to measure expected credit losses on financial assets carried at amortized cost on a collective or pool basis when similar risks exist. Trustmark uses several levels of segmentation to measure expected credit losses for its held to maturity securities: • The portfolio is segmented into agency and non-agency securities. • The non-agency securities are separated into municipal, mortgage, and corporate securities. • Each individual segment is categorized by third-party credit ratings. As discussed above, Trustmark has determined that for certain classes of securities it would be appropriate to assume the expected credit loss to be zero , which include debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government. This assumption is reviewed and attested to quarterly. Trustmark uses an internally built model to verify the accuracy of third-party provided calculations. Accrued interest receivable is excluded from the estimate of credit losses for securities held to maturity and included in other assets on the consolidated balance sheets. Trustmark monitors the credit quality of securities held to maturity on a monthly basis through credit ratings.
Loans Held for Sale (LHFS)	Loans Held for Sale (LHFS) Trustmark's LHFS portfolio consists of mortgage loans purchased from wholesale customers or originated in Trustmark’s General Banking Segment. Trustmark has elected to account for its LHFS under the fair value option permitted by FASB ASC Topic 825, “Financial Instruments,” with interest income on the LHFS reported in interest and fees on LHFS and LHFI. Trustmark reports unrealized gains and losses resulting from changes in the fair value of the LHFS accounted for under the fair value option as noninterest income in mortgage banking, net. 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 the fair value reported as noninterest income in mortgage banking, net. Changes in the fair value of the LHFS are largely offset by changes in the fair value of the derivative instruments. Election of the fair value option allows Trustmark to reduce the accounting volatility that would otherwise result from the asymmetry created by accounting for its LHFS at the lower of cost or fair value and the derivative instruments at fair value. Realized gains and losses upon ultimate sale of the loans are reported as noninterest income in mortgage banking, net. Government National Mortgage Association (GNMA) optional repurchase programs allow financial institutions to buy back individual delinquent mortgage loans that meet certain criteria from the securitized loan pool for which the institution provides servicing. At the servicer’s option and without GNMA’s prior authorization, the servicer may repurchase such a delinquent loan for an amount equal to 100 percent of the remaining principal balance of the loan. Under FASB ASC Topic 860, “Transfers and Servicing,” this buy-back option is considered a conditional option until the delinquency criteria are met, at which time the option becomes unconditional. When Trustmark is deemed to have regained effective control over these loans under the unconditional buy-back option, the loans can no longer be reported as sold and must be brought back onto the balance sheet as LHFS, regardless of whether Trustmark intends to exercise the buy-back option. These loans are reported as LHFS with the offsetting liability being reported as short-term borrowings. The fair value option election does not apply to the GNMA optional repurchase loans which do not meet the requirements under FASB ASC Topic 825 to be accounted for under the fair value option. Trustmark defers the upfront loan fees and costs related to the LHFS. In general, the LHFS are only retained on Trustmark’s balance sheet for 30 to 45 days before they are pooled and sold in the secondary market. The difference between deferring these loan fees and costs until the loans are sold and recognizing them in earnings as incurred as required by FASB ASC Subtopic 825-10 is considered immaterial. Deferred loan fees and costs are reflected in the basis of the LHFS and, as such, impact the resulting gain or loss when the loans are sold.
Loans Held for Investment (LHFI)	Loans Held for Investment (LHFI) LHFI are loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off and are reported at amortized cost net of the ACL. Amortized cost is the amount of unpaid principal, adjusted for the net amount of direct costs and nonrefundable loan fees associated with lending. The net amount of nonrefundable loan origination fees and direct costs associated with the lending process, including commitment fees, is deferred and accreted to interest income over the lives of the loans using a method that approximates the interest method. Interest on LHFI is accrued and recorded as interest income based on the outstanding principal balance. Past due LHFI are loans contractually past due 30 days or more as to principal or interest payments. A LHFI is classified as nonaccrual, and the accrual of interest on such loan is discontinued, when the contractual payment of principal or interest becomes 90 days past due on commercial credits and 120 days past due on non-business purpose credits. In addition, a credit may be placed on nonaccrual at any other time Management has serious doubts about further collectability of principal or interest according to the contractual terms, even though the loan is currently performing. A LHFI may remain in accrual status if it is in the process of collection and well-secured. When a LHFI is placed in nonaccrual status, interest accrued but not received is reversed against interest income. Interest payments received on nonaccrual LHFI are applied against principal under the cost-recovery method, until qualifying for return to accrual status. Under the cost-recovery method, interest income is not recognized until the principal balance is reduced to zero. LHFI are restored to accrual status when the ultimate collectability of the total contractual principal and interest is no longer in doubt and the obligation has either been brought current or has performed in accordance with the contractual terms for a reasonable period of time. Purchased Credit Deteriorated (PCD) Loans Purchased loans which have experienced more than insignificant credit deterioration since origination are considered PCD loans. An initial ACL for PCD loans is determined at acquisition using the same ACL methodology as the LHFI. The initial ACL determined on a collective basis is allocated to individual loans. PCD loans are reported at the amortized cost, which equals the loan purchased price plus the initial ACL. The difference between the amortized cost basis of the PCD loan and the par value of the loan is the noncredit premium or discount, which is amortized into interest income over the life of the loan. Subsequent changes to the ACL are recorded through the PCL, LHFI. Upon adoption of FASB ASC Topic 326, Trustmark elected to maintain pools of loans that were previously accounted for under FASB ASC Subtopic 310-30, “Receivables-Loans and Debt Securities Acquired with Deteriorated Credit Quality,” and will continue to account for these pools as a unit of account. Loans are only removed from the existing loan pools if they are written off, paid off or sold. Upon adoption of FASB ASC Topic 326, the ACL was determined for each pool and added to the pool’s carrying value to establish a new amortized cost basis. The difference between the unpaid principal balance of the pool and the new amortized cost basis is the noncredit premium or discount which will be amortized into interest income over the remaining life of the pool. Changes to the ACL after adoption of FASB ASC Topic 326 are recorded through the PCL, LHFI.
ACL	ACL LHFI Trustmark’s ACL methodology for LHFI is based upon guidance within FASB ASC Subtopic 326-20 as well as applicable regulatory guidance. The ACL on LHFI 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 on LHFI. The ACL on LHFI is an estimate of expected losses inherent within Trustmark’s existing LHFI portfolio. The ACL on LHFI is adjusted through the PCL, LHFI and reduced by the charge off of loan amounts, net of recoveries. The loan loss estimation process involves procedures to appropriately consider the unique characteristics of Trustmark’s LHFI portfolio segments. These segments are further disaggregated into loan classes, the level at which credit risk is estimated. When computing allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history, delinquency status and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future. Evaluations of the portfolio and individual credits are inherently subjective, as they require estimates, assumptions and judgments as to the facts and circumstances of particular situations. Determining the appropriateness of the allowance is complex and requires judgment by Management about the effect of matters that are inherently uncertain. In future periods, evaluations of the overall LHFI portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and credit loss expense. Trustmark estimates the ACL on LHFI using relevant available information, from internal and external sources, relating to past events, current conditions and reasonable and supportable forecasts. Trustmark uses a third-party software application to calculate the quantitative portion of the ACL on LHFI using a methodology and assumptions specific to each loan pool. The qualitative portion of the allowance is based on general economic conditions and other internal and external factors affecting Trustmark as a whole as well as specific LHFI. Factors considered include the following: lending policies and procedures, economic conditions and concentrations of credit, nature and volume of the portfolio, performance trends, and external factors. The quantitative and qualitative portions of the allowance are added together to determine the total ACL on LHFI, which reflects Management’s expectations of future conditions based on reasonable and supportable forecasts. The methodology for estimating the amount of expected credit losses reported in the ACL on LHFI 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 ACL for the collective component, loans are segregated into loan pools based on loan product types and similar risk characteristics. 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 ACL for individual loans that do not share risk characteristics with other loans is measured as the difference between the discounted value of expected future cash flows, based on the effective interest rate at origination, and the amortized cost basis of the loan, or the net realizable value. The ACL is the difference between the loan’s net realizable value and its amortized cost basis (net of previous charge-offs and deferred loan fees and costs), except for collateral-dependent loans. 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 the ‘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. If the calculated expected credit loss is determined to be permanent or not recoverable, the amount of the expected credit loss is charged off. Accrued interest receivable is not included in the amortized cost basis of Trustmark’s LHFI and, therefore, excluded from the estimate of credit losses for LHFI. LHFI are charged off against the ACL on LHFI, with any subsequent recoveries credited back to the ACL on LHFI account. Recoveries may not exceed the aggregate of amounts previously charged off. Trustmark’s Loan Policy Manual dictates the guidelines to be followed in determining when a loan is charged off. Commercial purpose LHFI are charged off when a determination is made that the loan is uncollectible and continuance as a bankable asset is not warranted. Consumer LHFI secured by 1-4 family residential real estate are generally charged off or written down to the fair value of the collateral less cost to sell at no later than 180 days of delinquency. Non-real estate consumer purpose LHFI, including both secured and unsecured loans, are generally charged off by 120 days of delinquency. Consumer revolving lines of credit and credit card debt are generally charged off on or prior to 180 days of delinquency. ACL on Off-Balance Sheet Credit Exposures Under FASB ASC Subtopic 326-20, Trustmark is required to estimate expected credit losses for off-balance sheet credit exposures which are not unconditionally cancellable. Trustmark maintains a separate ACL on off-balance sheet credit exposures, including unfunded loan commitments and letters of credit. Expected credit losses for off-balance sheet credit exposures are estimated by calculating a commitment usage factor over the contractual period for exposures that are not unconditionally cancellable by Trustmark. Trustmark calculates a loan pool level unfunded amount for the period. Trustmark views the loan pools as either closed-ended or open-ended. Closed-ended loan pools are those that typically fund up to 100% such as other construction and nonowner-occupied. Open-ended loan pools are those that behave similar to a revolver such as the commercial and industrial and home equity line of credit loan pools. In addition to the unfunded balances, Trustmark uses a funding rate for loan pools that are considered open-ended. Trustmark calculates the funding rate of the open-ended loan pools each period. In order to mitigate volatility and incorporate historical experience in the funding rate, Trustmark uses a twelve-quarter moving average. For the closed-ended loan pools, Trustmark takes a conservative approach and uses a 100% funding rate. The expected funding rate is applied to each pool’s unfunded commitment balances to ensure that reserves will be applied to each pool based on balances expected to be funded based upon historical levels. In addition to the funding rate being applied to the unfunded commitment balance, a reserve rate is applied that incorporates both quantitative and qualitative aspects of the current period’s expected credit loss rate. The reserve rate is loan pool specific and is applied to the unfunded amount to ensure loss factors, both quantitative and qualitative, are being considered on the unfunded portion of the loan pool, consistent with the methodology applied to the funded loan pools. Adjustments to the ACL on off-balance sheet credit exposures are recorded to the PCL, 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. ACL, LHFI Trustmark’s ACL methodology for LHFI is based upon guidance within 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 LHFI. The ACL is an estimate of expected losses inherent within Trustmark’s existing LHFI portfolio. The ACL for LHFI is adjusted through the PCL, LHFI 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 ACL 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 that are centrally underwritten based on the borrower's credit bureau score as well as an evaluation of the borrower’s repayment capacity, credit, and collateral. 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 1-4 family residential 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 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, Nonowner-occupied - 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 DCF Southern Vacancy Rate, Southern Unemployment Nonowner-occupied - DCF Southern Vacancy Rate, Southern Unemployment Nonresidential owner-occupied DCF Southern Unemployment, National GDP Other real estate secured Nonresidential nonowner DCF Southern Vacancy Rate, Southern Unemployment Nonresidential owner-occupied DCF Southern Unemployment, National GDP Nonowner-occupied - DCF Southern Vacancy Rate, Southern Unemployment Other loans secured by Other construction Other construction DCF Prime Rate, National Unemployment Secured by 1-4 family Trustmark mortgage WARM Southern Unemployment Commercial and Commercial and Commercial and industrial - DCF Trustmark historical data Commercial and industrial - DCF Trustmark historical data Equipment finance loans WARM Southern Unemployment, Southern GDP 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 State and other political Obligations of state and DCF Moody's Bond Default Study Other commercial loans and leases Other commercial loans and leases Other loans DCF Prime Rate, Southern Unemployment Commercial and industrial - DCF Trustmark historical data Commercial and industrial - DCF Trustmark historical data Equipment finance leases WARM Southern Unemployment, Southern GDP In general, Trustmark utilizes a DCF method to estimate the quantitative portion of the ACL 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 consumer loans and other commercial loans. During the first quarter of 2022, Management elected to incorporate a methodology change related to the other construction pool. Components of this change include management utilizing an alternative LDA to support the PD and LGD assumptions necessary to apply a DCF methodology to the other construction pool. Fundamentally, this approach utilizes publicly reported default balances and leverages a generalized linear model (GLM) framework to estimate PD. Taken together, these differences allow for results to be scaled to be specific and directly applicable to the other construction segment. LGD is assumed to be a through-the-cycle constant based on the actual performance of Trustmark’s other construction segment. These assumptions are then input into the DCF model and used in conjunction with prepayment data to calculate the cash flows at the individual loan level. Previously, the other construction pool used the weighted average remaining maturity (WARM) method. Management believes this change is commensurate with the level of risk in the pool. 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 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 changed rapidly. At the macroeconomic levels experienced during the COVID-19 pandemic, 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 Gross Domestic Product (GDP), Southern 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 and 99 th percentiles, respectively. These upper and lower limits are then used to calculate the PD for the forecast time period in which the forecasted values are outside of the upper and lower limit range. Due to multiple periods 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 at December 31, 2023: (i) economic conditions and concentrations of credit, (ii) nature and volume of the portfolio and (iii) performance trends. 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. Trustmark's current quantitative methodologies do not completely incorporate changes in credit quality. As a result Trustmark utilizes the performance trends factor. This factor is based on migration analyses, that allocates 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 performance trends qualitative factor is estimated by properly segmenting loan pools into risk levels by risk rating for commercial credits and delinquency status for consumer credits. A migration analysis is then performed quarterly using a third-party software and the results for each risk level is compiled to calculate the historical PD average for each loan portfolio based on risk levels. This average historical PD rate is updated annually. For the mortgage portfolio, Trustmark uses an internal report to incorporate a roll rate method for the calculation of the PD rate. In addition, to the PD rate for each portfolio, Management incorporates the quantitative rate and the k value derived from the Frye-Jacobs method to calculate a loss estimate that includes both PD and LGD. The quantitative rate is used to eliminate any additional reserve that the quantitative reserve already includes. Finally, the loss estimate rate is then applied to the total balances for each risk level for each portfolio to calculate a qualitative reserve. During the second quarter of 2022, Management elected to activate the nature and volume of the portfolio qualitative factor as a result of a sub-pool of the secured by 1-4 family residential properties growing to a significant size along with the underlying nature being different as well. The nature and volume of the portfolio qualitative factor utilizes a WARM methodology that uses industry data for the assumptions to support the qualitative adjustment. The industry data is used to compile a PD based on credit score ranges along with using the industry data to compile an LGD. The sub-pool of credits are then aggregated into the appropriate credit score bands in which a weighted average loss rate is calculated based on the PD and LGD for each credit score range. This weighted average loss rate is then applied to the expected balance for the sub-segment of credits. This total is then used as the qualitative reserve adjustment. The external factors qualitative factor is Management’s best judgment 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). Trustmark's External Factor – Pandemic ensures 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 PD (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. 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 were not being captured in the quantitative reserve. During 2020, due to unforeseen pandemic conditions that varied from Management’s expectations, 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. During the fourth quarter of 2022, Management noted that all pass rated loans (RR 5 & RR 6) related to the External Factor-Pandemic qualitative factor either did not experience significant stress related to the pandemic or have since recovered and does not expect future stresses attributed to the pandemic that may affect these loans. As a result, Management decided to accelerate the release of the additional pandemic reserves on all pass rated loans. During the fourth quarter of 2023, Management decided to resolve the External Factor-Pandemic qualitative factor as a result of the remaining loan balances that were identified as COVID affected loans were immaterial from both a reserve and balance perspective. The remaining loans were incorporated back into the performance qualitative factor as a result of this resolution. Further, due to this resolution there is no longer any active External Factor as of December 31, 2023. During the first quarter of 2022, in order to account for the potential uncertainty related to higher prices and low economic growth, Trustmark chose to enact a portion of the qualitative framework, External Factor - Stagflation. Management calculated the reserve using a third-party stagflation forecast and compared it to the third-party baseline forecast used in the quantitative modeling. The weighted differential is added as qualitative reserves to account for potential uncertainty. During the fourth quarter of 2022, Management determined that the likelihood of a stagflation scenario had sufficiently diminished. Management identified that the potential had already been reduced and effectively captured within a nominally more negative baseline economic forecast. As a result, Management elected to resolve the External Factor - Stagflation and fully release the reserves
Premises and Equipment, Net	Premises and Equipment, Net Premises and equipment are reported at cost, less accumulated depreciation and amortization. Depreciation is charged to expense over the estimated useful lives of the assets, which are up to thirty-nine years for buildings and three to ten years for furniture and equipment. Leasehold improvements are amortized over the terms of the respective leases or the estimated useful lives of the improvements, whichever is shorter. In cases where Trustmark has the right to renew the lease for additional periods, the lease term for the purpose of calculating amortization of the capitalized cost of the leasehold improvements is extended when Trustmark is “reasonably assured” that it will renew the lease. Depreciation and amortization expenses are computed using the straight-line method. Trustmark continually evaluates whether events and circumstances have occurred that indicate that such long-lived assets have become impaired. Measurement of any impairment of such long-lived assets is based on the fair values of those assets. Branch closures and purchased land held for future branch expansion for more than five years are evaluated to determine if the related land, buildings and building improvements should be transferred to assets held for sale in accordance with FASB ASC Topic 360, “Property, Plant and Equipment.” The property is transferred to assets held for sale at the lower of its carrying value or fair value less cost to sell. An impairment loss is recorded at the time of transfer if the carrying value of the assets exceeds the fair value. Impairment losses are recorded as noninterest expense in other expense.
Mortgage Servicing Rights (MSR)	Mortgage Servicing Rights (MSR) Trustmark recognizes as assets the rights to service mortgage loans based on the estimated fair value of the MSR when loans are sold and the associated servicing rights are retained. Trustmark has elected to account for the MSR at fair value. The fair value of the MSR is determined using a valuation model administered by a third party that calculates the present value of estimated future net servicing income. Estimates of fair value involve several assumptions, including the key valuation assumptions about market expectations of future prepayment rates, interest rates and discount rates which are provided by a third-party firm. Prepayment rates are projected using an industry standard prepayment model. The model considers other key factors, such as a wide range of standard industry assumptions tied to specific portfolio characteristics such as remittance cycles, escrow payment requirements, geographic factors, foreclosure loss exposure, VA no-bid exposure, delinquency rates and cost of servicing, including base cost and cost to service delinquent mortgages. Prevailing market conditions at the time of analysis are factored into the accumulation of assumptions and determination of servicing value. Trustmark economically hedges changes in the fair value of the MSR attributable to interest rates. See the section titled “Derivative Financial Instruments – Derivatives Not Designated as Hedging Instruments” of this note for information regarding these derivative instruments. Trustmark receives annual servicing fee income for loans serviced, which is recorded as noninterest income in mortgage banking, net. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned. Late fees and ancillary fees related to loan servicing are not considered material.
Goodwill and Identifiable Intangible Assets	Goodwill and Identifiable Intangible Assets Trustmark accounts for goodwill and other intangible assets in accordance with FASB ASC Topic 350, “Intangibles – Goodwill and Other.” Goodwill, which represents the excess of cost over the fair value of the net assets of an acquired business, is not amortized but tested for impairment on an annual basis, which is October 1 for Trustmark, or more often if events or circumstances indicate that there may be impairment. Identifiable intangible assets are acquired assets that lack physical substance but can be distinguished from goodwill because of contractual or legal rights or because the assets are capable of being sold or exchanged either on their own or in combination with a related contract, asset or liability. Trustmark’s identifiable intangible assets primarily relate to core deposits, insurance customer relationships and borrower relationships. These intangibles, which have definite useful lives, are amortized on an accelerated basis over their estimated useful lives. In addition, these intangibles are evaluated for impairment whenever events and changes in circumstances indicate that the carrying amount should be reevaluated. Trustmark also purchased banking charters in order to facilitate its entry into the states of Florida and Texas. These identifiable intangible assets are being amortized on a straight-line method over 20 years.
Other Real Estate	Other Real Estate 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. When foreclosed real estate is received in full satisfaction of a loan, the amount, if any, by which the recorded amount of the loan exceeds the estimated fair value of the property is a loss charged against the ACL at the time of foreclosure. If the recorded amount of the loan is less than the estimated fair value of the property, a credit is recorded to write-downs of other real estate at the time of foreclosure. Other real estate is revalued on an annual basis or more often if market conditions necessitate. An other real estate specific reserve may be recorded through other real estate expense for declines in fair value subsequent to foreclosure based on recent appraisals or changes in market conditions. Subsequent to foreclosure, losses on the periodic revaluation of the property are charged against an existing other real estate specific reserve or as noninterest expense in other real estate expense if a reserve does not exist. Costs of operating and maintaining the properties as well as gains or losses on their disposition are also included in other real estate expense as incurred. Improvements made to properties are capitalized if the expenditures are expected to be recovered upon the sale of the properties.
Lessor Arrangements	Lessor Arrangements Trustmark leases certain types of machinery and equipment to its commercial customers through sales-type and direct financing leases as part of its equipment financing portfolio. Sales-type and direct financing leases are similar to other forms of installment lending in that lessors generally do not retain benefits and risks incidental to ownership of the property subject to the leases. Such arrangements are essentially financing transactions that permit lessees to acquire and use property. Trustmark does not have any significant operating leases in which it is the lessor. As lessor, the sum of all minimum lease payments over the lease term and the estimated residual value, less unearned interest income, is recorded as the net investment in the lease on the commencement date and is included in LHFI on the consolidated balance sheets. Interest income is accrued as earned over the term of the lease based on the net investment in the leases and is recognized in interest and fees on LHFS and LHFI on the consolidated statements of income. Certain fees or costs associated with lease originations are deferred and accreted or amortized to interest income over the life of the lease using the effective interest method. Trustmark’s portfolio of sales-type and direct financing leases generally have remaining lease terms of three to ten years, some of which include renewal options and/or options for the lessee to purchase the leased property near or at the end of the lease term at either the residual value or a specified price. Trustmark expects to sell or release the equipment at the end of the lease term. Due to the structure of these leases, there is no selling profit or loss on these transactions.
Lessee Arrangements	Lessee Arrangements Trustmark has certain contracts that it has identified as leases according to FASB ASC Topic 842, "Leases". Trustmark classifies these leases as either operating or finance leases and recognizes a right-of-use asset and a lease liability at the lease commencement date. The lease liability represents the present value of the lease payments that remain unpaid as of the commencement date and the right-of-use asset is the initial lease liability recognized for the lease plus any lease payments made to the lessor at or before the commencement date as well as any initial direct costs less any lease incentives received. Trustmark accounts for the lease and nonlease components separately as such amounts are readily determinable. Trustmark’s finance leases consist of building and equipment leases. Trustmark recognizes interest expense based on the discount rate of the lease as interest expense in other interest expense and recognizes depreciation expense on a straight-line basis over the lease term as noninterest expense in net occupancy – premises for building leases and in equipment expense for equipment leases. Trustmark amortizes the right-of-use asset over the life of the lease term on a straight-line basis. Trustmark’s lease liabilities are measured as the present value of the remaining lease payments throughout the lease term. Trustmark records its finance lease right-of-use assets in premises and equipment, net and its finance lease liabilities in other borrowings. Trustmark’s operating leases primarily consist of building and land leases. Trustmark recognizes lease rent expense on a straight-line basis over the term of the lease contract and records it as noninterest expense in net occupancy – premises for building and land leases and in equipment expense for equipment leases. Trustmark’s amortization of the right-of-use asset is the difference between the straight-line lease expense and the interest expense recognized on the lease liability during the period. Trustmark’s lease liabilities are measured as the present value of the remaining lease payments throughout the lease term. Trustmark’s leases typically have one or more renewal options included in the lease contract. Due to the nature of Trustmark’s leases, for leases with renewal options available, Trustmark considers the first renewal option as reasonably certain to renew and is therefore included in the measurement of the right-of-use assets and lease liabilities. In order to calculate its right-of-use assets and lease liabilities, FASB ASC Topic 842 requires Trustmark to use the rate of interest implicit in the lease when readily determinable. If the rate implicit in the lease is not readily determinable, Trustmark is required to use its incremental borrowing rate, which is the rate of interest Trustmark would have to pay to borrow on a collateralized basis over a similar term in a similar economic environment. Trustmark was able to determine the implicit interest rate for its equipment leases and used that rate as its discount rate. Since the implicit interest rate for most of its building and land leases were not readily determinable, Trustmark used its incremental borrowing rate. Trustmark made an accounting policy election to not recognize short-term leases (12 months or less) on the balance sheet. Trustmark’s short-term leases primarily include automated teller machines. For short-term leases, Trustmark recognizes lease expense on a straight-line basis over the lease term.
Federal Home Loan Bank (FHLB) and Federal Reserve Bank of Atlanta Stock	Federal Home Loan Bank (FHLB) and Federal Reserve Bank of Atlanta Stock Trustmark accounts for its investments in FHLB and Federal Reserve Bank of Atlanta stock in accordance with FASB ASC Subtopic 942-325, “Financial Services-Depository and Lending-Investments-Other.” FHLB and Federal Reserve Bank stock are equity securities that do not have a readily determinable fair value because its ownership is restricted and it lacks a market. FHLB and Federal Reserve Bank stock are carried at cost and evaluated for impairment. Trustmark’s investment in member bank stock is included in other assets in the accompanying consolidated balance sheets. At December 31, 2023 and 2022 , Trustmark’s investment in member bank stock totaled $ 54.4 million and $ 72.2 million, respectively. The carrying value of Trustmark’s member bank stock gave rise to no other-than-temporary impairment for the years ended December 31, 2023, 2022 and 2021 .
Revenue from Contract with Customers	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. General Banking Segment Service Charges on Deposit Accounts In general, deposit accounts represent contracts with customers with no fixed duration and can be terminated or modified by either party at any time without compensation to the other party. According to FASB ASC Topic 606, a contract that can be terminated by either party without compensation does not exist for periods beyond the then-current period. Therefore, deposit contracts are considered to renew day-to-day if not minute-to-minute. Deposit contracts have a single continuous or stand-ready service obligation whereby Trustmark makes customer funds available for use by the customer as and when the customer chooses as well as other services such as statement rendering and online banking. The specific services provided vary based on the type of deposit account. These services are not individually distinct, but are distinct as a group, and therefore, constitute a single performance obligation which is satisfied over time and qualifies as a series of distinct service periods. Trustmark receives a fixed service charge amount as consideration monthly for services rendered. The service charge amount varies based on the type of deposit account. Some of the service charge revenue is subject to refund provisions, which is variable consideration under the guidelines of FASB ASC Topic 606. Trustmark has elected the ‘as-invoiced’ practical expedient permitted under FASB ASC Topic 606 for recognition of service charge revenue. Therefore, revenue is recognized at the time and in the amount the customer is charged. The service charge revenue is presented net of refunded amounts on Trustmark’s consolidated statements of income. Services related to non-sufficient funds, overdrafts, excess account activity, stop payments, dormant accounts, etc. are considered optional purchases for a deposit contract because there is no performance obligation for Trustmark until the service is requested by the customer or the occurrence of a triggering event. Fees for these services are fixed amounts and are charged to the customer when the service is performed. Revenue is recognized at the time the customer is charged. Bank Card and Other Fees Revenue from contracts with customers in bank card and other fees includes income related to interchange fees and various other contracts which primarily consists of contracts with a single performance obligation that is satisfied at a point in time. Trustmark receives a fixed consideration amount once the performance obligation is completed for these contracts. Trustmark reports revenue from these contracts net of amounts refunded or due to a third party. As both a debit and credit card issuer, Trustmark receives an interchange fee for every card transaction completed by its customers with a merchant. Trustmark receives two types of interchange fees: point-of-sale transactions in which the customer must enter the PIN associated with the card to complete the transaction (a debit card transaction), and signature transactions in which the signature of the customer is required to complete the transaction (a credit card transaction). Trustmark, as the card issuing or settlement bank, has a contract (implied based on customary business practices) with the payment network in which Trustmark has a single continuous service obligation to make funds available for settlement of the card transaction. Trustmark’s service obligation is satisfied over time and qualifies as a series of distinct service periods. Trustmark receives interchange fees as consideration for services rendered in the amount established by the respective payment network. The interchange fees are established by the payment network based on the type of transaction and is posted on their website. Trustmark receives and records interchange fee revenue from the payment networks daily net of all fees and amounts due to the payment network. Other Income Revenue from contracts with customers in other income includes income related to cash management services and other contracts with a single performance obligation that is satisfied at a point in time. Trustmark receives a fixed consideration amount once the performance obligation is completed for these contracts. Trustmark reports revenue from these contracts net of amounts refunded or due to a third party. Trustmark provides cash management services through the delivery of various products and services offered to its business and municipal customers including various departments of state, city and local governments, universities and other non-profit entities. Similar to the deposit account contracts, the cash management contracts primarily represent contracts with customers with no fixed duration and can be terminated or modified by either party at any time without compensation to the other party. Therefore, cash management contracts are generally considered to renew day-to-day if not minute-to-minute. Cash management contracts have a single continuous or stand-ready service obligation whereby Trustmark makes a specific service or group of services available for use by the customer as and when the customer chooses. The specific services provided vary based on the type of account or product. These services are not individually distinct, but are distinct as a group, and therefore, constitute a single performance obligation which is satisfied over time and qualifies as a series of distinct service periods. Trustmark receives a set service charge or maintenance fee amount as consideration monthly for services rendered. However, some of the fees are based on the number of transactions that occur ( i.e., flat fee for a set number of transactions per month then an additional charge for each transaction after that) or the average daily account balance maintained by the customer during the month and a small amount of the cash management fee revenue is subject to refund provisions. These fees represent variable consideration under the guidelines of FASB ASC Topic 606. Trustmark has elected the ‘as-invoiced’ practical expedient permitted under FASB ASC Topic 606 for recognition of cash management fee revenue. The cash management revenue is presented net of any refunded amounts on Trustmark’s consolidated statements of income. Trustmark’s merchant services provider contracts directly with Trustmark business customers and provides Trustmark’s merchant customers card processing equipment and transaction processing services. Trustmark’s contract with the merchant services provider has a single-continuous service obligation to provide customer referrals for potential new accounts which is satisfied over time and qualifies as a series of distinct service periods. Trustmark receives a flat fee for each new account established and a percentage of the residual income related to transactions processed for Trustmark’s merchant customers each month as provided in the contract. Under the guidelines of FASB ASC Topic 606, the fee received for each new account and the profit sharing represent variable consideration. Revenue from merchant card services contracts is recognized monthly using a time-elapsed measure of progress. Trustmark has elected the ‘as-invoiced’ practical expedient permitted under FASB ASC Topic 606 for recognition of the merchant card services revenue. Other Real Estate 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 expense. Other real estate sales for the year ended December 31, 2023 resulted in a net loss of $ 145 thousand compared to a net loss of $ 1.0 million for the year ended December 31, 2022 and a net loss of $ 1.9 million for the year ended December 31, 2021. In general, purchases of Trustmark’s other real estate property are not financed by Trustmark. Financing the purchase of other real estate is evaluated based upon the same lending policies and procedures as all other types of loans. Under FASB ASC Subtopic 610-20, “Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets,” when Trustmark finances the sale of its other real estate to a buyer, Trustmark is required to assess whether the buyer is committed to perform their obligations under the contract and whether collectability of the transaction price is probable. Once these two criteria are met, Trustmark derecognizes the other real estate asset and records a gain or loss on the sale once control of the property is transferred to the buyer. Wealth Management Segment Trust Management There are five categories of revenue included in trust management: personal trust and investments, retirement plan services, institutional custody, corporate trust and other. Each of these categories includes multiple types of contracts, service obligations and fee income. However, the majority of these contracts include a single service obligation that is satisfied over time, the customer is charged in arrears for services rendered and revenue is recognized when payment is received. In general, the time period between when the service obligation is completed and when payment from the customer is received is less than 30 days. Revenue from trust management contracts is primarily related to monthly service periods and based on the prior month-end’s market value. Some trust management revenue is mandated by a court order, while other revenue consists of flat fees. Trust management revenue based on an account’s market value represents variable consideration under the guidelines of FASB ASC Topic 606. Trustmark has elected the ‘as-invoiced’ practical expedient allowed under FASB ASC Topic 606 to account for the trust management revenue. Assets under administration held by Trustmark in a fiduciary or agency capacity for customers are not included in Trustmark’s consolidated balance sheets. Investment Services Investment services includes both brokerage and annuity income. Trustmark has a contract with a third-party investment services company which contains a single continuous service obligation, to provide broker-dealer and advisory services to customers on behalf of the third-party, which is satisfied over time and qualifies as a series of distinct service periods. Trustmark serves as the agent between the third-party investment services company, the principle, and the customer. In accordance with the contract, Trustmark receives a monthly payment from the investment services company for commissions and advisory fees (asset management fees) earned on transactions completed in the prior month net of all charges and fees due to the investment services company. Trustmark recognizes revenue from the investment services company, net of the revenue sharing expense due to the investment services company, when the payments are received. Commissions vary from month-to-month based on the specific products and transactions completed. The advisory fees vary based on the average daily balance of the managed assets for the period. The commissions and advisory fees represent variable consideration under FASB ASC Topic 606. Trustmark has elected the ‘as-invoiced’ practical expedient allowed under FASB ASC Topic 606 to recognize revenue from the investment services company. Insurance Segment Fisher Brown Bottrell Insurance, Inc. (FBBI), a wholly-owned subsidiary of Trustmark National Bank (TNB), operates as an insurance broker representing the policyholder and has no allegiance with any one insurance provider. FBBI serves as the agent between the insurance provider (either insurance carrier or broker), the principal, and the policy holder, the customer. FBBI has four general categories of insurance contracts: commercial, commercial installments, personal and employee benefits. FBBI’s insurance contracts contain a single performance obligation, policy placement, which is satisfied at a point in time. FBBI’s performance obligation is satisfied as of the policy effective date. In addition to policy placement, FBBI provides various other periodic services to the policyholders for which no additional fee is charged. These additional services are not considered material to the overall contract. Trustmark has elected the immaterial promises practical expedient allowed under FASB ASC Topic 606, which allows Trustmark to not assess whether promised services are performance obligations if the promised services are immaterial in the context of the contract. Therefore, the immaterial additional services offered to policyholders are not considered a performance obligation and no amount of the contract transaction price is allocated to these services. In general, the transaction price for the insurance contracts is an established commission amount agreed upon by FBBI and the insurance provider. The commission amount varies based on the insurance provider and the type of policy. There are a small number of insurance contracts which FBBI does not receive a commission but charges a fee directly to the policyholder. Most of the commissions from insurance contracts are subject to clawback provisions which require FBBI to refund a prorated amount of the commissions received as a result of policy cancellations or lapses. Commissions subject to clawback provisions are considered variable consideration under FASB ASC Topic 606. Trustmark believes the expected value method of estimating the commissions subject to clawback provisions would best predict the amount of commissions FBBI will be entitled to because of the large number of insurance contracts with similar characteristics and the number of possible outcomes. FBBI calculates a separate weighted-average percentage (returned commissions percentage) based on actual cancellations over the previous three years for commercial lines, bonds, and personal lines. FBBI applies the respective returned commissions percentage to the commission revenue earned related to insurance contracts within these three lines each month to calculate the estimated returned commissions amount, which represents the variable consideration subject to variable constraint. Revenue from insurance contracts is reported net of the variable consideration subject to variable constraint. FBBI performs an analysis of the returned commissions reserve quarterly and adjusts the reserve balance based on all available information including actual cancellations and the remaining term of the contract. The returned commission percentage is updated annually. Insurance Producers at FBBI earn commission as compensation for each policy they are responsible for placing. FBBI utilizes a ‘pay when paid’ system. Under the ‘pay when paid’ system, Producers receive the commissions for which they are entitled at the end of the month following the month in which FBBI receives payment from the insurance provider or customer. Under FASB ASC Subtopic 340-40, “Other Assets and Deferred Costs: Contracts with Customers,” the commission paid to the Producers is an incremental cost of obtaining a contract, which should be capitalized and amortized in a manner consistent with the pattern of transfer of the service related to the contract acquisition asset. Insurance contracts have a term of one year or less; therefore, Trustmark has elected the cost of obtaining a contract practical expedient allowed under FASB ASC Subtopic 340-40, which allows FBBI to recognize the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the contract asset that FBBI otherwise would have recognized is one year or less. Commission expense is recorded as noninterest expense in salaries and employee benefits when paid to the Producers. Commercial Insurance Revenue from FBBI’s commercial insurance contracts (both agency billed and direct billed) consists of a set commission amount, which is subject to clawback provisions. Revenue from commercial installment insurance contracts consists of a set commission amount, which is not subject to clawback provisions. An estimated commission amount is entered in the agency management system when a commercial insurance contract is placed. FBBI records a top line receivable based on the estimated commission amount entered in the system each month, along with a corresponding amount recognized as revenue, and then adjusts the estimated receivable when the commissions are received from the insurance provider or customer. Personal Insurance Revenue from FBBI’s personal insurance contracts consists of a set commission amount, which is subject to clawback provisions, and is recognized when payment is received (generally 30 - 60 days after the policy effective date). Personal insurance contracts have a term of one year ; therefore, recognizing the revenue from these contracts when payment is received is not materially different than recognizing the revenue at the policy effective date for any given period. Employee Benefits Insurance Revenue from FBBI’s employee benefits insurance contracts consists of a variable commission amount, which is not subject to clawback provisions, and is recognized when payment is received, typically on a monthly basis. Employee benefits insurance contracts have a set commission rate, but can vary from period to period based on changes in the number of employees covered by the policy ( i.e., new hires and terminations). FBBI generally receives twelve monthly commission payments for these contracts with the initial payment being received approximately 60 - 90 days after the policy effective date. Under the guidelines of FASB ASC Topic 606, commissions from employee benefits insurance contracts represent fixed consideration because at contract inception (policy effective date) there is a set commission rate times a known number of covered employees. Changes in the number of covered employees are not known, nor can they be predicted, at contract inception. An increase or decrease in the number of covered employees after the policy effective date is considered a contract modification resulting from a change in scope and transaction price under FASB ASC Topic 606. This modification is treated as part of the existing contract because it does not add a distinct service. Employee benefits insurance contracts have a term of one year ; therefore, recognizing the revenue from these contracts when payment is received is not materially different than recognizing the revenue at the policy effective date or the contract modification date for any given period. Contingency Commission Insurance In addition to the insurance contracts discussed above, FBBI has contracts with various insurance providers for which it receives contingency income based on volume of business and claims experience. FBBI is the principal and the insurance provider is the customer for these contingency commission insurance contracts. The contingency commission contracts have a single continuous or stand-ready service obligation whereby FBBI places policies with policyholders when acceptable to the insurance provider, which is satisfied over time. The contract term for these contingency commission contracts is one year . Revenue is recognized from the contingency commission contracts monthly using a time-elapsed measure of progress. FBBI accrues throughout the current year the amount of contingency commission income it expects to receive in the following year adjusted for a degree of uncertainty. FBBI updates a detail by insurance provider with the contingency commission income received, which is then compared to the total amount that was expected to be received. If actual receipts are higher or lower than the amount accrued in the prior year, the monthly accrual for the current year is adjusted accordingly. Under the guidelines of FASB ASC Topic 606, revenue from contingency commission insurance contracts represents variable consideration and should be estimated using one of the two allowable methods subject to the variable consideration constraint. FBBI believes the most likely amount method to be the most appropriate method for estimating the variable consideration as there are only a few possible outcomes for each contract.
Derivative Financial Instruments	Derivative Financial Instruments Trustmark maintains an overall interest rate risk management strategy that incorporates the use of derivative instruments to minimize significant unplanned fluctuations in earnings and cash flows caused by interest rate volatility. Trustmark’s interest rate risk management strategy involves modifying the repricing characteristics of certain assets and liabilities so that changes in interest rates do not adversely affect the net interest margin and cash flows. Under the guidelines of FASB ASC Topic 815, “Derivatives and Hedging,” all derivative instruments are required to be recognized as either assets or liabilities and carried at fair value on the balance sheet. The fair value of derivative positions outstanding is included in other assets and/or other liabilities in the accompanying consolidated balance sheets and in the net change in these financial statement line items in the accompanying consolidated statements of cash flows as well as included in noninterest income in the accompanying consolidated statements of income and other comprehensive income (loss), net of tax in the accompanying consolidated statements of comprehensive income. Trustmark’s interest rate 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. Derivatives Designated as Hedging Instruments FASB ASC Topic 815, Derivatives and Hedging (ASC 815), provides the disclosure requirements for derivatives and hedging activities with the intent to provide users of financial statements with an enhanced understanding of: (a) how and why an entity uses derivative instruments, (b) how the entity accounts for derivative instruments and related hedged items, and (c) how derivative instruments and related hedged items affect an entity’s financial position, financial performance, and cash flows. Further, qualitative disclosures are required that explain the objectives and strategies for using derivatives, as well as quantitative disclosures about the fair value of and gains and losses on derivative instruments, and disclosures about credit-risk-related contingent features in derivative instruments. Derivatives designated and qualifying as a hedge of the exposure to changes in the fair value of an asset, liability, or firm commitment attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the changes in the fair value of the hedged asset or liability that are attributable to the hedged risk in a fair value hedge or the earnings effect of the hedged forecasted transactions in a cash flow hedge. When entering into a hedge transaction, Trustmark formally documents the relationship between the hedging instrument and the hedged item, as well as the risk management objective and strategy for undertaking the hedge transaction, which includes designating the derivative instrument as a fair value or cash flow hedge to a specific asset or liability on the balance sheet or to specific forecasted transactions and the risk being hedged, along with a formal assessment at the inception of the hedge as to the effectiveness of the derivative instrument in offsetting changes in fair values or cash flows of the hedged item. Trustmark continues to assess hedge effectiveness on an ongoing basis using either a qualitative or a quantitative assessment (regression analysis). As required by ASC 815, Trustmark records all derivatives on the balance sheet at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether Trustmark has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. For cash flow hedges, changes in the fair value of the derivative instrument are recorded in accumulated other comprehensive income (loss) and subsequently reclassified to net income in the same period that the hedged transaction impacts net income. Upon discontinuation of hedge accounting for cash flow hedges, any amounts in accumulated other comprehensive income (loss) related to that relationship affects earnings at the same time and in the same manner in which the hedged transaction affects earnings. If it becomes probable that the forecasted transaction will not occur, any related amounts in accumulated other comprehensive income (loss) are reclassified to earnings immediately. Derivatives Not Designated as Hedging Instruments 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 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. See Note 1 – Significant Accounting Policies, “Loans Held for Sale (LHFS)” for information regarding the fair value option election. Trustmark also utilizes derivative instruments such as interest rate lock commitments in its mortgage banking area. 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 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. These exchange-traded derivative instruments are accounted for at fair value with changes in the fair value recorded as noninterest income in mortgage banking, net and are offset by changes in the fair value of the MSR. The MSR fair value represents the present value of future cash flows, which among other things includes decay and the effect of changes in interest rates. Ineffectiveness of hedging the MSR fair value is measured by comparing the change in the fair value of the hedge instruments to the change in the fair value of the MSR asset attributable to changes in interest rates and other market driven changes in valuation inputs and assumptions. 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. Derivative 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 offsetting interest rate swap transactions are either cleared through the Chicago Mercantile Exchange for clearable transactions or booked directly with institutional derivatives market participants for non-clearable transactions. 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.
Income Taxes	Income Taxes Trustmark accounts for uncertain tax positions in accordance with FASB ASC Topic 740, “Income Taxes,” which clarifies the accounting and disclosure for uncertainty in tax positions. Under the guidance of FASB ASC Topic 740, Trustmark accounts for deferred income taxes using the liability method. Deferred tax assets and liabilities are based on temporary differences between the financial statement carrying amounts and the tax basis of Trustmark’s assets and liabilities. Deferred tax assets and liabilities are measured using the enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be realized or settled and are presented net in the accompanying consolidated balance sheets in other assets.
Stock-Based Compensation	Stock-Based Compensation Trustmark accounts for the stock and incentive compensation under the provisions of FASB ASC Topic 718, “Compensation – Stock Compensation.” Under this accounting guidance, fair value is established as the measurement objective in accounting for stock awards and requires the application of a fair value based measurement method in accounting for compensation cost, which is recognized over the requisite service period. Trustmark has elected to account for forfeitures of stock awards as they occur.
Statements of Cash Flows	Statements of Cash Flows For purposes of reporting cash flows, cash and cash equivalents include cash on hand and amounts due from banks. The following table reflects specific transaction amounts for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Income taxes paid $ 38,803 $ 2,701 $ 15,259 Interest paid on deposits and borrowings 306,568 45,275 24,429 Noncash transfers from loans to other real estate 7,237 1,533 770 Securities transferred from available for sale to held to maturity — 674,092 — Investment in tax credit partnership not funded 3,202 18,891 10,647 Finance right-of-use assets resulting from lease liabilities — — 92 Operating right-of-use assets resulting from lease liabilities 7,303 6,912 9,666
Per Share Data	Per Share Data Trustmark accounts for per share data in accordance with FASB ASC Topic 260, “Earnings Per Share,” which provides that unvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of earnings per share (EPS) pursuant to the two-class method. Trustmark has determined that its outstanding unvested stock awards are not participating securities. Based on this determination, no change has been made to Trustmark’s current computation for basic and diluted EPS. Basic EPS is computed by dividing net income by the weighted-average shares of common stock outstanding. Diluted EPS is computed by dividing net income by the weighted-average shares of common stock outstanding, adjusted for the effect of potentially dilutive stock awards outstanding during the period. The following table reflects weighted-average shares used to calculate basic and diluted EPS for the periods presented (in thousands): Years Ended December 31, 2023 2022 2021 Basic shares 61,054 61,242 62,788 Dilutive shares 177 190 185 Diluted shares 61,231 61,432 62,973 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): Years Ended December 31, 2023 2022 2021 Weighted-average antidilutive stock awards 23 — 1
Fair Value Measurements	Fair Value Measurements FASB ASC Topic 820, “Fair Value Measurements and Disclosures,” defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and requires certain disclosures about fair value measurements. The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. Depending on the nature of the asset or liability, Trustmark uses various valuation techniques and assumptions when estimating fair value. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. FASB ASC Topic 820 establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows: Level 1 Inputs – Valuation is based upon quoted prices (unadjusted) in active markets for identical assets or liabilities that Trustmark has the ability to access at the measurement date. Level 2 Inputs – Valuation is based upon quoted prices in active markets for similar assets or liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability such as interest rates, yield curves, volatilities and default rates and inputs that are derived principally from or corroborated by observable market data. Level 3 Inputs – Unobservable inputs reflecting the reporting entity’s own determination about the assumptions that market participants would use in pricing the asset or liability based on the best information available. In instances where the determination of the fair value measurement is based on inputs from different levels of the fair value hierarchy, the level in the fair value hierarchy within which the fair value measurement in its entirety is classified is based on the lowest level input that is significant to the fair value measurement in its entirety. Trustmark’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability. Transfers between levels of the fair value hierarchy are recognized on the actual date of the event or circumstances that caused the transfer.
Accounting Policies Recently Adopted	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 2022-02, “Financial Instruments-Credit Losses (Topic 326): Trouble Debt Restructurings and Vintage Disclosures.” Issued in March 2022, ASU 2022-02 seeks to improve the decision usefulness of information provided to investors concerning certain loan refinancings, restructurings and write-offs. In regard to troubled debt restructurings (TDRs) by creditors, investors and preparers observed that the additional designation of a loan modification as a TDR and the related accounting are unnecessarily complex and no longer provide decision-useful information. The amendments of ASU 2022-02 eliminate the accounting guidance for TDRs by creditors in FASB ASC Subtopic 310-40, “Receivables-Troubled Debt Restructurings by Creditors,” as it is no longer meaningful due to the implementation of FASB ASC Topic 326, which requires an entity to consider lifetime expected credit losses on loans when establishing an allowance for credit losses. Therefore, most losses that would have been realized for a TDR under FASB ASC Subtopic 310-40 are now captured by the accounting required under FASB ASC Topic 326. The amendments of ASU 2022-02 also enhanced disclosure requirements for certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty. Stakeholders also noted inconsistency in the requirement for a public business entity (PBE) to disclose gross write-offs and gross recoveries by class of financing receivable and major security type in certain vintage disclosures. Financial statement users expressed that, in addition to the existing vintage disclosures in FASB ASC Topic 326, information about gross write-offs by year of origination would be helpful in understanding credit quality changes in an entity’s loan portfolio and underwriting performance. For PBEs, the amendments of ASU 2022-02 require that an entity disclose current period gross write-offs by year of origination for financing receivables and net investments in leases within the scope of FASB ASC Subtopic 326-20, “Financial Instruments-Credit Losses-Measured at Amortized Cost.” For write-offs associated with origination dates that are more than five annual periods before the reporting period, an entity may present aggregate amounts in the current period for financing receivables and net investment in leases. The amendments of ASU 2022-02 were effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2022 for entities that have already adopted the amendments of ASU 2016-13, such as Trustmark. Trustmark adopted the amendments of ASU 2022-02 effective January 1, 2023 . The amendments of ASU 2022-02 include only changes to certain financial statement disclosures; and, therefore, adoption of ASU 2022-02 did not have a material impact on Trustmark’s consolidated financial statements or results of operations. The enhanced disclosures required by ASU 2022-02 are presented in Note 4 - LHFI and ACL, LHFI of this report. ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” Issued in November 2023, ASU 2023-07 is intended to improve disclosures about a public entity’s reportable segments and address requests from investors and other allocators of capital for additional, more detailed information about a reportable segment’s expenses. The amendments of ASU 2023-07 require a public entity to disclose, on an annual and interim basis, significant segment expenses that are regularly provided to the chief operating decision maker (CODM) and included within each reported measure of segment profit or loss, and an amount for other segment items by reportable segment and a description of its composition. The other segment items category is the difference between segment revenue less the significant expenses disclosed and each reported measure of segment profit or loss. ASU 2023-07 also requires a public entity to provide all annual disclosures about a reportable segment’s profit or loss and assets currently required under FASB ASC Topic 280 in interim periods. The amendments of ASU 2023-07 clarify that if the CODM uses more than one measure of a segment's profit or loss in assessing segment performance and deciding how to allocate resources, a public entity may report one or more of those additional measures of segment profit. However, at least one of the reported segment profit or loss measures (or the single reported measure if only one is disclosed) should be the measure that is most consistent with the measurement principles used in measuring the corresponding amounts in the public entity's consolidated financial statements. ASU 2023-07 requires a public entity to disclose the title and position of the CODM, together with an explanation of how the CODM uses the reported measure(s) of segment profit or loss in assessing segment performance and deciding how to allocate resources. In addition, ASU 2023-07 requires that a public entity with a single reportable segment provide all the disclosures required by the amendments of ASU 2023-07 and all existing segment disclosures in FASB ASC Topic 280. The amendments of ASU 2023-07 are effective for fiscal years beginning after December 15, 2023, and for interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. The amendments in ASU 2023-07 should be applied retrospectively to all periods presented on the financial statements. Upon implementation, the segment expense categories and amounts disclosed in the prior periods should be based on the significant segment expense categories identified and disclosed in the period of adoption. Trustmark has adopted the amendments of ASU 2023-07 related to annual disclosure requirements effective January 1, 2024, and will present any newly required annual disclosures in its Annual Report of Form 10-K for the year ending December 31, 2024. Trustmark intends to adopt the amendments of ASU 2023-07 related to interim disclosure requirements effective January 1, 2025, and will present any newly required interim disclosures beginning with its Quarterly Report on Form 10-Q for the period ending March 31, 2025. Adoption of ASU 2023-07 is not expected to have a material impact to Trustmark’s consolidated financial statements or results of operations. Pending Accounting Pronouncements ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” Issued in December 2023, ASU 2023-09 is intended to improve the disclosures for income taxes to address requests from investors, lenders, creditors and other allocators of capital (collectively, "investors") that use the financial statements to make capital allocation decisions. During the FASB's 2021 agenda consultation process and other stakeholder outreach, investors highlighted that the current system of income tax disclosures does not provide enough information to understand the tax provision for an entity that operates in multiple jurisdictions. Investors currently rely on the rate reconciliation table and other disclosures, including total income taxes paid in the statement of cash flows, to evaluate income tax risks and opportunities. The amendments in ASU 2023-09 will require consistent categories and greater disaggregation of information in the rate reconciliation disclosure as well as disclosure of income taxes paid disaggregated by jurisdiction. The amendments of ASU 2023-09 are effective for annual periods beginning after December 15, 2024, and early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. Trustmark intends to adopt the amendments of ASU 2023-09 effective January 1, 2025, and will include the required disclosures in its Annual Report on Form 10-K for the year ending December 31, 2025. Trustmark is currently evaluating the changes to disclosures required by ASU 2023-09; however, adoption of ASU 2023-09 is not expected to have a material impact to Trustmark’s consolidated financial statements or results of operations.
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 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. At both December 31, 2023 and 2022 , the results of the loss analysis performed did not identify any securities that warranted DCF analysis 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 December 31, 2023 and 2022 , accrued interest receivable totaled $ 3.7 million and $ 4.0 million, respectively, for securities available for sale and was reported in other assets on the accompanying consolidated balance sheet.
Securities Held to Maturity	Securities Held to Maturity At December 31, 2023 and 2022 , the potential credit loss exposure for Trustmark’s securities held to maturity was $ 340 thousand and $ 4.5 million, respectively, and consisted of municipal securities. After applying appropriate probability of default and loss given default assumptions, the total amount of current expected credit losses was deemed immaterial. Therefore, no reserve was recorded at December 31, 2023 and 2022. Accrued interest receivable is excluded from the estimate of credit losses for securities held to maturity. At December 31, 2023 and 2022 , accrued interest receivable totaled $ 2.6 million and $ 2.7 million for securities held to maturity and was reported in other assets on the accompanying consolidated balance sheet. At both December 31, 2023 and 2022 , 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 December 31, 2023 and 2022 .

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Cash Flows Supplementary Disclosures	For purposes of reporting cash flows, cash and cash equivalents include cash on hand and amounts due from banks. The following table reflects specific transaction amounts for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Income taxes paid $ 38,803 $ 2,701 $ 15,259 Interest paid on deposits and borrowings 306,568 45,275 24,429 Noncash transfers from loans to other real estate 7,237 1,533 770 Securities transferred from available for sale to held to maturity — 674,092 — Investment in tax credit partnership not funded 3,202 18,891 10,647 Finance right-of-use assets resulting from lease liabilities — — 92 Operating right-of-use assets resulting from lease liabilities 7,303 6,912 9,666
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): Years Ended December 31, 2023 2022 2021 Basic shares 61,054 61,242 62,788 Dilutive shares 177 190 185 Diluted shares 61,231 61,432 62,973
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): Years Ended December 31, 2023 2022 2021 Weighted-average antidilutive stock awards 23 — 1

Securities Available for Sale_2

Securities Available for Sale and Held to Maturity (Tables)	12 Months Ended
	Dec. 31, 2023
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 December 31, 2023 and 2022 ($ in thousands): Securities Available for Sale Securities Held to Maturity Gross Gross Estimated Gross Gross Estimated Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair December 31, 2023 Cost Gains Losses Value Cost Gains Losses Value U.S. Treasury securities $ 396,179 $ — $ ( 23,811 ) $ 372,368 $ 29,068 $ — $ ( 26 ) $ 29,042 U.S. Government agency obligations 6,207 1 ( 416 ) 5,792 — — — — Obligations of states and political — — — — 340 — — 340 Mortgage-backed securities Residential mortgage pass-through Guaranteed by GNMA 25,744 4 ( 2,613 ) 23,135 13,005 — ( 497 ) 12,508 Issued by FNMA and FHLMC 1,338,256 32 ( 161,490 ) 1,176,798 469,593 — ( 18,205 ) 451,388 Other residential mortgage-backed Issued or guaranteed by FNMA, 92,076 — ( 6,002 ) 86,074 154,466 — ( 10,113 ) 144,353 Commercial mortgage-backed Issued or guaranteed by FNMA, 100,545 — ( 1,834 ) 98,711 759,807 51 ( 41,985 ) 717,873 Total $ 1,959,007 $ 37 $ ( 196,166 ) $ 1,762,878 $ 1,426,279 $ 51 $ ( 70,826 ) $ 1,355,504 December 31, 2022 U.S. Treasury securities $ 425,719 $ 308 $ ( 34,514 ) $ 391,513 $ 28,295 $ — $ ( 115 ) $ 28,180 U.S. Government agency obligations 8,297 — ( 531 ) 7,766 — — — — Obligations of states and political 4,820 53 ( 11 ) 4,862 4,510 3 ( 3 ) 4,510 Mortgage-backed securities Residential mortgage pass-through Guaranteed by GNMA 30,534 7 ( 3,444 ) 27,097 4,442 — ( 395 ) 4,047 Issued by FNMA and FHLMC 1,541,570 12 ( 196,119 ) 1,345,463 509,311 — ( 19,586 ) 489,725 Other residential mortgage-backed Issued or guaranteed by FNMA, 123,755 — ( 8,615 ) 115,140 188,201 — ( 13,826 ) 174,375 Commercial mortgage-backed Issued or guaranteed by FNMA, 136,014 — ( 3,773 ) 132,241 759,755 34 ( 54,037 ) 705,752 Total $ 2,270,709 $ 380 $ ( 247,007 ) $ 2,024,082 $ 1,494,514 $ 37 $ ( 87,962 ) $ 1,406,589
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 December 31, 2023 and 2022 ($ in thousands): December 31, 2023 December 31, 2022 Aaa $ 1,425,939 $ 1,490,004 Aa1 to Aa3 — 3,001 Not Rated (1) 340 1,509 Total $ 1,426,279 $ 1,494,514 (1) Not rated securities primarily consist of Mississippi municipal general obligations.
Securities with Gross Unrealized Losses, Segregated by Length of Impairment	The table below includes securities with gross unrealized losses for which an ACL has not been recorded and segregated by length of impairment at December 31, 2023 and 2022 ($ in thousands): Less than 12 Months 12 Months or More Total Gross Gross Gross Estimated Unrealized Estimated Unrealized Estimated Unrealized December 31, 2023 Fair Value Losses Fair Value Losses Fair Value Losses U.S. Treasury securities $ 29,042 $ ( 26 ) $ 372,368 $ ( 23,811 ) $ 401,410 $ ( 23,837 ) U.S. Government agency obligations — — 5,791 ( 416 ) 5,791 ( 416 ) Mortgage-backed securities Residential mortgage pass-through Guaranteed by GNMA 9,381 ( 172 ) 25,967 ( 2,938 ) 35,348 ( 3,110 ) Issued by FNMA and FHLMC 309,466 ( 3,274 ) 1,311,865 ( 176,421 ) 1,621,331 ( 179,695 ) Other residential mortgage-backed Issued or guaranteed by FNMA, — — 230,368 ( 16,115 ) 230,368 ( 16,115 ) Commercial mortgage-backed Issued or guaranteed by FNMA, 1,656 ( 13 ) 812,520 ( 43,806 ) 814,176 ( 43,819 ) Total $ 349,545 $ ( 3,485 ) $ 2,758,879 $ ( 263,507 ) $ 3,108,424 $ ( 266,992 ) December 31, 2022 U.S. Treasury securities $ 161,298 $ ( 5,655 ) $ 258,087 $ ( 28,974 ) $ 419,385 $ ( 34,629 ) U.S. Government agency obligations 1,828 ( 184 ) 5,938 ( 347 ) 7,766 ( 531 ) Obligations of states and political 1,017 ( 11 ) 3,664 ( 3 ) 4,681 ( 14 ) Mortgage-backed securities Residential mortgage pass-through Guaranteed by GNMA 27,223 ( 3,270 ) 3,577 ( 569 ) 30,800 ( 3,839 ) Issued by FNMA and FHLMC 770,865 ( 41,807 ) 1,062,041 ( 173,898 ) 1,832,906 ( 215,705 ) Other residential mortgage-backed Issued or guaranteed by FNMA, 281,964 ( 21,452 ) 7,235 ( 989 ) 289,199 ( 22,441 ) Commercial mortgage-backed Issued or guaranteed by FNMA, 833,970 ( 57,742 ) 1,644 ( 68 ) 835,614 ( 57,810 ) Total $ 2,078,165 $ ( 130,121 ) $ 1,342,186 $ ( 204,848 ) $ 3,420,351 $ ( 334,969 )
Gains and Losses as a Result of Calls and Disposition of Securities	For the years ended December 31, 2023, 2022 and 2021, gross realized gains or losses as a result of calls and dispositions of securities, as well as any associated proceeds, were as follows ($ in thousands): Years Ended December 31, Available for Sale 2023 2022 2021 Proceeds from calls and sales of securities $ 4,796 $ — $ — Gross realized gains 47 — — Gross realized losses ( 8 ) — —
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 December 31, 2023, 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 Securities Available for Sale Held to Maturity Amortized Estimated Amortized Estimated Cost Fair Value Cost Fair Value Due in one year or less $ 65,199 $ 63,501 $ 340 $ 340 Due after one year through five years 331,225 309,108 29,068 29,042 Due after five years through ten years 2,356 2,151 — — Due after ten years 3,606 3,400 — — 402,386 378,160 29,408 29,382 Mortgage-backed securities 1,556,621 1,384,718 1,396,871 1,326,122 Total $ 1,959,007 $ 1,762,878 $ 1,426,279 $ 1,355,504

LHFI and ACL, LHFII (Tables)

LHFI and ACL, LHFII (Tables)	12 Months Ended
	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Loan Portfolio Held for Investment	At December 31, 2023 and 2022, LHFI consisted of the following ($ in thousands): December 31, 2023 2022 Loans secured by real estate: Construction, land development and other land $ 642,886 $ 690,616 Other secured by 1-4 family residential properties 622,397 590,790 Secured by nonfarm, nonresidential properties 3,489,434 3,278,830 Other real estate secured 1,312,551 742,538 Other loans secured by real estate: Other construction 867,793 1,028,926 Secured by 1-4 family residential properties 2,282,318 2,185,057 Commercial and industrial loans 1,922,910 1,821,259 Consumer loans 165,734 170,230 State and other political subdivision loans 1,088,466 1,223,863 Other commercial loans and leases 556,035 471,930 LHFI 12,950,524 12,204,039 Less ACL 139,367 120,214 Net LHFI $ 12,811,157 $ 12,083,825
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 December 31, 2023 and 2022 ($ in thousands): December 31, 2023 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 $ 2,020 $ 2,642 $ — Other secured by 1-4 family residential properties 946 6,518 1,238 Secured by nonfarm, nonresidential properties 20,812 23,061 54 Other real estate secured — 158 106 Other loans secured by real estate: Other construction — 62 — Secured by 1-4 family residential properties 3,235 43,815 3,740 Commercial and industrial loans 79 22,303 24 Consumer loans — 243 628 Other commercial loans and leases — 1,206 — Total $ 27,092 $ 100,008 $ 5,790 December 31, 2022 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 $ 137 $ 1,902 $ — Other secured by 1-4 family residential properties 482 3,957 534 Secured by nonfarm, nonresidential properties 4,841 6,957 — Other real estate secured — 231 — Other loans secured by real estate: Other construction — 7,620 — Secured by 1-4 family residential properties 1,193 19,775 3,118 Commercial and industrial loans 14,441 25,102 — Consumer loans — 181 277 Other commercial loans — 247 — Total $ 21,094 $ 65,972 $ 3,929
Aging Analysis of Past Due and Nonaccrual LHFI by Loan Type	The following tables provide an aging analysis of the amortized cost basis of past due LHFI (including nonaccrual loans) at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 Past Due 90 Days Total Current 30-59 Days 60-89 Days or More Past Due Loans Total LHFI Loans secured by real estate: Construction, land development and other land $ 93 $ 507 $ 2,362 $ 2,962 $ 639,924 $ 642,886 Other secured by 1-4 family residential properties 4,493 1,687 2,716 8,896 613,501 622,397 Secured by nonfarm, nonresidential properties 1,531 1,063 727 3,321 3,486,113 3,489,434 Other real estate secured 126 — 207 333 1,312,218 1,312,551 Other loans secured by real estate: Other construction 62 — — 62 867,731 867,793 Secured by 1-4 family residential properties 19,298 9,327 22,164 50,789 2,231,529 2,282,318 Commercial and industrial loans 11,881 484 499 12,864 1,910,046 1,922,910 Consumer loans 2,112 772 647 3,531 162,203 165,734 State and other political subdivision loans 152 — — 152 1,088,314 1,088,466 Other commercial loans and leases 1,247 58 — 1,305 554,730 556,035 Total $ 40,995 $ 13,898 $ 29,322 $ 84,215 $ 12,866,309 $ 12,950,524 December 31, 2022 Past Due 90 Days Total Current 30-59 Days 60-89 Days or More Past Due Loans Total LHFI Loans secured by real estate: Construction, land development and other land $ 1,972 $ 199 $ 34 $ 2,205 $ 688,411 $ 690,616 Other secured by 1-4 family residential properties 3,682 1,206 1,281 6,169 584,621 590,790 Secured by nonfarm, nonresidential properties 825 18 794 1,637 3,277,193 3,278,830 Other real estate secured 131 30 — 161 742,377 742,538 Other loans secured by real estate: Other construction — — 7,620 7,620 1,021,306 1,028,926 Secured by 1-4 family residential properties 10,709 4,236 9,999 24,944 2,160,113 2,185,057 Commercial and industrial loans 1,966 508 8,974 11,448 1,809,811 1,821,259 Consumer loans 2,199 645 279 3,123 167,107 170,230 State and other political subdivision loans 431 — — 431 1,223,432 1,223,863 Other commercial loans 785 45 24 854 471,076 471,930 Total $ 22,700 $ 6,887 $ 29,005 $ 58,592 $ 12,145,447 $ 12,204,039 Modified LHFI
Impact of Modifications Classified as Troubled Debt Restructurings	The following tables present the amortized cost of LHFI at the end of each of the periods presented of loans modified to borrowers experiencing financial difficulty disaggregated by class of loan and type of modification ($ in thousands). The percentage of the amortized cost basis of LHFI that were modified to borrowers in financial distress as compared to the amortized cost basis of each class of LHFI is also presented below : Year Ended December 31, 2023 Payment Concessions Term Extensions Total % of Total Class of Loan Loans secured by real estate: Other secured by 1-4 family residential properties $ — $ 805 $ 805 0.13 % Secured by nonfarm, nonresidential properties — 359 359 0.01 % Other loans secured by real estate: Secured by 1-4 family residential properties — 1,148 1,148 0.05 % Commercial and industrial loans 242 — 242 0.01 % Consumer loans — 36 36 0.02 % Other commercial loans and leases 116 31 147 0.03 % Total $ 358 $ 2,379 $ 2,737 0.02 %
Troubled debt restructurings on financial effect	The following table details the financial effect of the loan modifications presented above to borrowers experiencing financial difficulty for the periods presented : Year Ended December 31, 2023 Financial Effect Payment Concessions Term Extensions Loans secured by real estate: Other secured by 1-4 family residential properties Modifed lines of credit to amortize over 12 month and 24 month terms Secured by nonfarm, nonresidential properties One loan renewed and extended maturity by six months Other loans secured by real estate: Secured by 1-4 family residential properties Extended amortization with term adjusted by weighted-average 3.4 years Commercial and industrial loans Six month payment deferrals Consumer loans Bankruptcies extended amortization with term adjusted by weighted average 1.3 years reducing borrower payment Other commercial loans and leases Six month payment deferrals One loan renewed and extended maturity by seven months
Past Due Modifications Related To Loans Held For Investment	The following tables provide details of the performance of such LHFI that have been modified during the periods presented ($ in thousands): Year Ended December 31, 2023 Past Due 90 Days Total Current 30-59 Days 60-89 Days or More Past Due Loans Total Loans secured by real estate: Other secured by 1-4 family residential properties $ 290 $ 17 $ — $ 307 $ 498 $ 805 Secured by nonfarm, nonresidential properties — — — — 359 359 Other loans secured by real estate: Secured by 1-4 family residential properties 64 — — 64 1,084 1,148 Commercial and industrial loans — — — — 242 242 Consumer loans 17 — — 17 19 36 Other commercial loans and leases — — — — 147 147 Total $ 371 $ 17 $ — $ 388 $ 2,349 $ 2,737
Schedule Of Amortized Cost Basis Of Collateral Dependent Loans by Class of Loans	The following tables present the amortized cost basis of collateral-dependent loans by class of loans and collateral type at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 Real Estate Vehicles Miscellaneous Total Loans secured by real estate: Construction, land development and $ 2,020 $ — $ — $ 2,020 Other secured by 1-4 family 946 — — 946 Secured by nonfarm, nonresidential 20,812 — — 20,812 Other loans secured by real estate: Secured by 1-4 family residential 3,235 — — 3,235 Commercial and industrial loans 38 41 21,023 21,102 Other commercial loans and leases — — 967 967 Total $ 27,051 $ 41 $ 21,990 $ 49,082 December 31, 2022 Real Estate Inventory and Receivables Vehicles Miscellaneous Total Loans secured by real estate: Construction, land development and $ 1,558 $ — $ — $ — $ 1,558 Other secured by 1-4 family 482 — — — 482 Secured by nonfarm, nonresidential 4,841 — — — 4,841 Other loans secured by real estate: Other construction 7,620 — — — 7,620 Secured by 1-4 family residential 1,193 — — — 1,193 Commercial and industrial loans 40 233 395 23,926 24,594 Total $ 15,734 $ 233 $ 395 $ 23,926 $ 40,288
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 December 31, 2023 and 2022 ($ in thousands): Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of December 31, 2023 Commercial LHFI Loans secured by real estate: Construction, land development Pass - RR 1 through RR 6 $ 359,813 $ 98,742 $ 35,095 $ 10,591 $ 2,036 $ 1,961 $ 52,351 $ 560,589 Special Mention - RR 7 — — 360 — — — — 360 Substandard - RR 8 606 336 1,512 19 — 21 — 2,494 Doubtful - RR 9 — — — — — 24 — 24 Total 360,419 99,078 36,967 10,610 2,036 2,006 52,351 563,467 Current period gross — ( 4 ) ( 10 ) — ( 228 ) — — ( 242 ) Other secured by 1-4 family residential Pass - RR 1 through RR 6 $ 33,072 $ 30,760 $ 29,159 $ 14,309 $ 8,084 $ 2,822 $ 10,077 $ 128,283 Special Mention - RR 7 — 82 48 10 — — — 140 Substandard - RR 8 220 625 157 22 80 306 98 1,508 Doubtful - RR 9 — — — — — — — — Total 33,292 31,467 29,364 14,341 8,164 3,128 10,175 129,931 Current period gross — — ( 24 ) — — ( 6 ) — ( 30 ) Secured by nonfarm, nonresidential Pass - RR 1 through RR 6 $ 501,327 $ 919,519 $ 526,412 $ 596,240 $ 323,687 $ 369,250 $ 129,142 $ 3,365,577 Special Mention - RR 7 4,271 14,930 — 138 23,966 — — 43,305 Substandard - RR 8 6,332 1,964 47,491 10,809 8,614 5,200 48 80,458 Doubtful - RR 9 21 — — — 53 13 — 87 Total 511,951 936,413 573,903 607,187 356,320 374,463 129,190 3,489,427 Current period gross — ( 39 ) ( 82 ) — ( 19 ) ( 138 ) — ( 278 ) Other real estate secured: Pass - RR 1 through RR 6 $ 194,141 $ 447,200 $ 332,818 $ 209,757 $ 56,024 $ 11,080 $ 8,880 $ 1,259,900 Special Mention - RR 7 126 2,076 — — 35,881 — — 38,083 Substandard - RR 8 — 14,064 — 290 — 39 — 14,393 Doubtful - RR 9 42 — — — — — — 42 Total 194,309 463,340 332,818 210,047 91,905 11,119 8,880 1,312,418 Current period gross — — — — — — — — Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of December 31, 2023 Commercial LHFI Other loans secured by real estate: Other construction Pass - RR 1 through RR 6 $ 179,676 $ 518,062 $ 149,883 $ 14,062 $ — $ 6 $ 6,042 $ 867,731 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 62 — — — — — — 62 Doubtful - RR 9 — — — — — — — — Total 179,738 518,062 149,883 14,062 — 6 6,042 867,793 Current period gross ( 61 ) — ( 3,392 ) — — — — ( 3,453 ) Commercial and industrial loans: Pass - RR 1 through RR 6 $ 497,730 $ 474,737 $ 158,659 $ 80,646 $ 31,876 $ 44,972 $ 537,527 $ 1,826,147 Special Mention - RR 7 12,570 10,141 3,149 1,381 110 — 126 27,477 Substandard - RR 8 4,797 16,872 13,909 11,958 40 80 21,528 69,184 Doubtful - RR 9 6 58 1 — — 25 12 102 Total 515,103 501,808 175,718 93,985 32,026 45,077 559,193 1,922,910 Current period gross ( 42 ) ( 1,071 ) ( 700 ) ( 138 ) ( 95 ) ( 108 ) ( 7 ) ( 2,161 ) State and other political subdivision loans: Pass - RR 1 through RR 6 $ 152,157 $ 247,034 $ 174,812 $ 99,786 $ 32,118 $ 377,225 $ 5,334 $ 1,088,466 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 — — — — — — — — Doubtful - RR 9 — — — — — — — — Total 152,157 247,034 174,812 99,786 32,118 377,225 5,334 1,088,466 Current period gross — — — — — — — — Other commercial loans and leases: Pass - RR 1 through RR 6 $ 211,402 $ 48,947 $ 30,071 $ 21,377 $ 32,837 $ 8,468 $ 201,339 $ 554,441 Special Mention - RR 7 — — — 208 — — 20 228 Substandard - RR 8 106 211 42 — — — 987 1,346 Doubtful - RR 9 — — — — — 20 — 20 Total 211,508 49,158 30,113 21,585 32,837 8,488 202,346 556,035 Current period gross ( 40 ) ( 248 ) — ( 26 ) — — — ( 314 ) Total commercial LHFI $ 2,158,477 $ 2,846,360 $ 1,503,578 $ 1,071,603 $ 555,406 $ 821,512 $ 973,511 $ 9,930,447 Total commercial LHFI $ ( 143 ) $ ( 1,362 ) $ ( 4,208 ) $ ( 164 ) $ ( 342 ) $ ( 252 ) $ ( 7 ) $ ( 6,478 ) Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of December 31, 2023 Consumer LHFI Loans secured by real estate: Construction, land development and Current $ 44,912 $ 23,110 $ 5,973 $ 1,203 $ 1,082 $ 1,864 $ 653 $ 78,797 Past due 30-89 days — 250 — — 30 191 — 471 Past due 90 days or more — — — — — — — — Nonaccrual — — 148 — — 3 — 151 Total 44,912 23,360 6,121 1,203 1,112 2,058 653 79,419 Current period gross — — — — — — — — Other secured by 1-4 family residential Current $ 29,636 $ 11,366 $ 5,733 $ 4,471 $ 4,313 $ 7,674 $ 417,383 $ 480,576 Past due 30-89 days 225 68 74 4 51 220 4,292 4,934 Past due 90 days or more — 264 — — — 41 934 1,239 Nonaccrual 8 76 48 8 — 616 4,961 5,717 Total 29,869 11,774 5,855 4,483 4,364 8,551 427,570 492,466 Current period gross — ( 100 ) ( 9 ) ( 2 ) ( 10 ) ( 22 ) ( 147 ) ( 290 ) Secured by nonfarm, nonresidential Current $ — $ — $ 7 $ — $ — $ — $ — $ 7 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — — 7 — — — — 7 Current period gross — — — — — — — — Other real estate secured: Current $ — $ — $ — $ 78 $ — $ 55 $ — $ 133 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — — — 78 — 55 — 133 Current period gross — — — — — — — — Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of December 31, 2023 Consumer LHFI Other loans secured by real estate: Secured by 1-4 family residential properties Current $ 258,800 $ 878,893 $ 516,324 $ 180,272 $ 98,552 $ 277,664 $ — $ 2,210,505 Past due 30-89 days 3,370 11,293 5,513 2,121 298 1,664 — 24,259 Past due 90 days or more 376 1,219 1,208 682 — 255 — 3,740 Nonaccrual 678 15,586 11,452 4,884 1,848 9,366 — 43,814 Total 263,224 906,991 534,497 187,959 100,698 288,949 — 2,282,318 Current period gross ( 64 ) ( 930 ) ( 217 ) ( 104 ) — ( 142 ) — ( 1,457 ) Consumer loans: Current $ 59,496 $ 32,767 $ 10,698 $ 2,604 $ 917 $ 294 $ 55,321 $ 162,097 Past due 30-89 days 1,274 475 134 34 5 5 839 2,766 Past due 90 days or more 64 44 3 1 — — 516 628 Nonaccrual 44 65 84 26 — — 24 243 Total 60,878 33,351 10,919 2,665 922 299 56,700 165,734 Current period gross ( 6,138 ) ( 559 ) ( 167 ) ( 43 ) ( 1 ) ( 1 ) ( 2,381 ) ( 9,290 ) Total consumer LHFI $ 398,883 $ 975,476 $ 557,399 $ 196,388 $ 107,096 $ 299,912 $ 484,923 $ 3,020,077 Total consumer LHFI $ ( 6,202 ) $ ( 1,589 ) $ ( 393 ) $ ( 149 ) $ ( 11 ) $ ( 165 ) $ ( 2,528 ) $ ( 11,037 ) Total LHFI $ 2,557,360 $ 3,821,836 $ 2,060,977 $ 1,267,991 $ 662,502 $ 1,121,424 $ 1,458,434 $ 12,950,524 Total current period $ ( 6,345 ) $ ( 2,951 ) $ ( 4,601 ) $ ( 313 ) $ ( 353 ) $ ( 417 ) $ ( 2,535 ) $ ( 17,515 ) Term Loans by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Total As of December 31, 2022 Commercial LHFI Loans secured by real estate: Construction, land development Pass - RR 1 through RR 6 $ 363,824 $ 119,727 $ 29,632 $ 3,405 $ 1,016 $ 2,364 $ 64,953 $ 584,921 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 146 199 — 1,415 — — 44 1,804 Doubtful - RR 9 — — — — — 42 — 42 Total 363,970 119,926 29,632 4,820 1,016 2,406 64,997 586,767 Other secured by 1-4 family residential Pass - RR 1 through RR 6 $ 41,996 $ 33,346 $ 17,215 $ 9,341 $ 6,798 $ 2,870 $ 12,209 $ 123,775 Special Mention - RR 7 29 64 17 — — — — 110 Substandard - RR 8 686 31 75 88 220 285 — 1,385 Doubtful - RR 9 15 — — — — — — 15 Total 42,726 33,441 17,307 9,429 7,018 3,155 12,209 125,285 Secured by nonfarm, nonresidential Pass - RR 1 through RR 6 $ 889,556 $ 657,242 $ 603,515 $ 457,163 $ 205,425 $ 281,828 $ 130,052 $ 3,224,781 Special Mention - RR 7 10,284 — — 271 — — — 10,555 Substandard - RR 8 12,034 1,066 9,457 905 706 18,488 693 43,349 Doubtful - RR 9 34 — — 77 — 18 — 129 Total 911,908 658,308 612,972 458,416 206,131 300,334 130,745 3,278,814 Other real estate secured: Pass - RR 1 through RR 6 $ 293,051 $ 156,386 $ 143,114 $ 107,827 $ 11,297 $ 17,626 $ 12,516 $ 741,817 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 30 — 309 — 5 68 126 538 Doubtful - RR 9 — — — — — — — — Total 293,081 156,386 143,423 107,827 11,302 17,694 12,642 742,355 Term Loans by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Total As of December 31, 2022 Commercial LHFI Other loans secured by real estate: Other construction Pass - RR 1 through RR 6 $ 372,981 $ 306,904 $ 340,388 $ 833 $ — $ — $ 200 $ 1,021,306 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 — 7,620 — — — — — 7,620 Doubtful - RR 9 — — — — — — — — Total 372,981 314,524 340,388 833 — — 200 1,028,926 Commercial and industrial loans: Pass - RR 1 through RR 6 $ 673,848 $ 261,962 $ 120,123 $ 44,994 $ 14,265 $ 69,078 $ 577,749 $ 1,762,019 Special Mention - RR 7 — — 12,421 — — — 6,454 18,875 Substandard - RR 8 6,973 9,845 2,170 312 74 — 20,625 39,999 Doubtful - RR 9 240 53 10 4 35 — 24 366 Total 681,061 271,860 134,724 45,310 14,374 69,078 604,852 1,821,259 State and other political subdivision loans: Pass - RR 1 through RR 6 $ 393,345 $ 223,302 $ 123,350 $ 39,031 $ 18,876 $ 421,588 $ 1,671 $ 1,221,163 Special Mention - RR 7 — — — — — 2,700 — 2,700 Substandard - RR 8 — — — — — — — — Doubtful - RR 9 — — — — — — — — Total 393,345 223,302 123,350 39,031 18,876 424,288 1,671 1,223,863 Other commercial loans: Pass - RR 1 through RR 6 $ 88,763 $ 40,006 $ 28,239 $ 37,607 $ 6,424 $ 10,829 $ 244,882 $ 456,750 Special Mention - RR 7 879 — — — — — — 879 Substandard - RR 8 3,728 98 — — 16 1,134 9,301 14,277 Doubtful - RR 9 24 — — — — — — 24 Total 93,394 40,104 28,239 37,607 6,440 11,963 254,183 471,930 Total commercial LHFI $ 3,152,466 $ 1,817,851 $ 1,430,035 $ 703,273 $ 265,157 $ 828,918 $ 1,081,499 $ 9,279,199 Term Loans by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Total As of December 31, 2022 Consumer LHFI Loans secured by real estate: Construction, land development and Current $ 62,049 $ 32,867 $ 3,304 $ 1,759 $ 1,679 $ 1,915 $ — $ 103,573 Past due 30-89 days — 150 — 36 15 9 — 210 Past due 90 days or more — — — — — — — — Nonaccrual — 58 — — — 8 — 66 Total 62,049 33,075 3,304 1,795 1,694 1,932 — 103,849 Other secured by 1-4 family residential Current $ 25,402 $ 7,983 $ 5,389 $ 4,894 $ 3,701 $ 7,252 $ 403,123 $ 457,744 Past due 30-89 days 19 35 15 134 5 286 3,197 3,691 Past due 90 days or more — — — 1 — — 452 453 Nonaccrual 88 24 4 20 7 454 3,020 3,617 Total 25,509 8,042 5,408 5,049 3,713 7,992 409,792 465,505 Secured by nonfarm, nonresidential Current $ — $ 16 $ — $ — $ — $ — $ — $ 16 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — 16 — — — — — 16 Other real estate secured: Current $ — $ — $ 89 $ — $ 5 $ 89 $ — $ 183 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — — 89 — 5 89 — 183 Term Loans by Origination Year 2022 2021 2020 2019 2018 Prior Revolving Loans Total As of December 31, 2022 Consumer LHFI Other loans secured by real estate: Secured by 1-4 family residential properties Current $ 939,511 $ 559,804 $ 198,769 $ 109,466 $ 80,249 $ 262,196 $ — $ 2,149,995 Past due 30-89 days 3,967 3,752 2,119 425 — 1,906 — 12,169 Past due 90 days or more 835 777 272 — 134 1,100 — 3,118 Nonaccrual 2,363 4,180 3,275 1,896 2,028 6,033 — 19,775 Total 946,676 568,513 204,435 111,787 82,411 271,235 — 2,185,057 Consumer loans: Current $ 70,858 $ 25,771 $ 9,514 $ 2,509 $ 1,513 $ 295 $ 56,508 $ 166,968 Past due 30-89 days 1,431 238 159 8 23 10 946 2,815 Past due 90 days or more 28 12 7 1 2 — 216 266 Nonaccrual 79 41 19 17 4 — 21 181 Total 72,396 26,062 9,699 2,535 1,542 305 57,691 170,230 Total consumer LHFI $ 1,106,630 $ 635,708 $ 222,935 $ 121,166 $ 89,365 $ 281,553 $ 467,483 $ 2,924,840 Total LHFI $ 4,259,096 $ 2,453,559 $ 1,652,970 $ 824,439 $ 354,522 $ 1,110,471 $ 1,548,982 $ 12,204,039
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 1-4 family residential 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 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, Nonowner-occupied - 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 DCF Southern Vacancy Rate, Southern Unemployment Nonowner-occupied - DCF Southern Vacancy Rate, Southern Unemployment Nonresidential owner-occupied DCF Southern Unemployment, National GDP Other real estate secured Nonresidential nonowner DCF Southern Vacancy Rate, Southern Unemployment Nonresidential owner-occupied DCF Southern Unemployment, National GDP Nonowner-occupied - DCF Southern Vacancy Rate, Southern Unemployment Other loans secured by Other construction Other construction DCF Prime Rate, National Unemployment Secured by 1-4 family Trustmark mortgage WARM Southern Unemployment Commercial and Commercial and Commercial and industrial - DCF Trustmark historical data Commercial and industrial - DCF Trustmark historical data Equipment finance loans WARM Southern Unemployment, Southern GDP 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 State and other political Obligations of state and DCF Moody's Bond Default Study Other commercial loans and leases Other commercial loans and leases Other loans DCF Prime Rate, Southern Unemployment Commercial and industrial - DCF Trustmark historical data Commercial and industrial - DCF Trustmark historical data Equipment finance leases WARM Southern Unemployment, Southern GDP
Change in Allowance for Loan Losses	The following tables disaggregate the ACL, LHFI and the amortized cost basis of the loans by the measurement methodology used at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 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 $ — $ 17,192 $ 17,192 $ 2,020 640,866 $ 642,886 Other secured by 1-4 family residential properties — 12,942 12,942 946 621,451 622,397 Secured by nonfarm, nonresidential properties — 24,043 24,043 20,812 3,468,622 3,489,434 Other real estate secured — 4,488 4,488 — 1,312,551 1,312,551 Other loans secured by real estate: Other construction — 5,758 5,758 — 867,793 867,793 Secured by 1-4 family residential properties — 34,794 34,794 3,235 2,279,083 2,282,318 Commercial and industrial loans 11,436 15,202 26,638 21,102 1,901,808 1,922,910 Consumer loans — 5,794 5,794 — 165,734 165,734 State and other political subdivision loans — 646 646 — 1,088,466 1,088,466 Other commercial loans and leases 967 6,105 7,072 967 555,068 556,035 Total $ 12,403 $ 126,964 $ 139,367 $ 49,082 $ 12,901,442 $ 12,950,524 December 31, 2022 ACL LHFI Individually Evaluated Collectively Evaluated for Credit Loss Total Individually Evaluated for Credit Loss Collectively Evaluated for Credit Loss Total Loans secured by real estate: Construction, land development and other land $ 121 $ 12,707 $ 12,828 $ 1,558 $ 689,058 $ 690,616 Other secured by 1-4 family residential properties — 12,374 12,374 482 590,308 590,790 Secured by nonfarm, nonresidential properties — 19,488 19,488 4,841 3,273,989 3,278,830 Other real estate secured — 4,743 4,743 — 742,538 742,538 Other loans secured by real estate: Other construction 7,620 7,512 15,132 7,620 1,021,306 1,028,926 Secured by 1-4 family residential properties — 21,185 21,185 1,193 2,183,864 2,185,057 Commercial and industrial loans 9,946 13,194 23,140 24,594 1,796,665 1,821,259 Consumer loans — 5,792 5,792 — 170,230 170,230 State and other political subdivision loans — 885 885 — 1,223,863 1,223,863 Other commercial loans — 4,647 4,647 — 471,930 471,930 Total $ 17,687 $ 102,527 $ 120,214 $ 40,288 $ 12,163,751 $ 12,204,039 Changes in the ACL, LHFI were as follows for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Balance at beginning of period $ 120,214 $ 99,457 $ 117,306 Loans charged-off ( 17,515 ) ( 11,332 ) ( 10,275 ) Recoveries 9,306 10,412 13,925 Net (charge-offs) recoveries ( 8,209 ) ( 920 ) 3,650 PCL, LHFI 27,362 21,677 ( 21,499 ) Balance at end of period $ 139,367 $ 120,214 $ 99,457 The following tables detail changes in the ACL, LHFI by loan class for the years ended December 31, 2023 and 2022 ($ in thousands): 2023 Balance Balance January 1, Charge-offs Recoveries PCL December 31, Loans secured by real estate: Construction, land development and other land $ 12,828 $ ( 242 ) $ 142 $ 4,464 $ 17,192 Other secured by 1-4 family residential properties 12,374 ( 320 ) 439 449 12,942 Secured by nonfarm, nonresidential properties 19,488 ( 278 ) 2,328 2,505 24,043 Other real estate secured 4,743 — 28 ( 283 ) 4,488 Other loans secured by real estate: Other construction 15,132 ( 3,453 ) 73 ( 5,994 ) 5,758 Secured by 1-4 family residential properties 21,185 ( 1,457 ) 38 15,028 34,794 Commercial and industrial loans 23,140 ( 2,161 ) 1,066 4,593 26,638 Consumer loans 5,792 ( 9,290 ) 5,192 4,100 5,794 State and other political subdivision loans 885 — — ( 239 ) 646 Other commercial loans and leases 4,647 ( 314 ) — 2,739 7,072 Total $ 120,214 $ ( 17,515 ) $ 9,306 $ 27,362 $ 139,367 The PCL, LHFI for the year ended December 31, 2023 was primarily attributable to loan growth, extended maturities on the secured by 1-4 family residential properties resulting from lower prepayment speeds, changes in the macroeconomic forecast and net adjustments to the qualitative factors. The negative PCL, LHFI for the other construction portfolio for the year ended December 31, 2023 was primarily due to the transfer of a fully-reserved nonaccrual loan to other real estate, net. 2022 Balance Charge-offs Recoveries PCL Balance Loans secured by real estate: Construction, land development and other land $ 6,079 $ ( 226 ) $ 1,280 $ 5,695 $ 12,828 Other secured by 1-4 family residential properties 10,310 ( 225 ) 597 1,692 12,374 Secured by nonfarm, nonresidential properties 37,912 ( 306 ) 1,724 ( 19,842 ) 19,488 Other real estate secured 4,713 ( 131 ) 14 147 4,743 Other loans secured by real estate: Other construction 5,968 ( 153 ) 222 9,095 15,132 Secured by 1-4 family residential properties 2,706 ( 154 ) 167 18,466 21,185 Commercial and industrial loans 18,939 ( 671 ) 955 3,917 23,140 Consumer loans 4,774 ( 2,125 ) 1,563 1,580 5,792 State and other political subdivision loans 2,708 — — ( 1,823 ) 885 Other commercial loans 5,348 ( 7,341 ) 3,890 2,750 4,647 Total $ 99,457 $ ( 11,332 ) $ 10,412 $ 21,677 $ 120,214

Premises and Equipment, Net (Ta

Premises and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Premises and Equipment, Net	At December 31, 2023 and 2022, premises and equipment, net consisted of the following ($ in thousands): December 31, 2023 2022 Land $ 56,747 $ 54,300 Buildings and leasehold improvements 247,173 237,215 Furniture and equipment 212,625 198,698 Total cost of premises and equipment 516,545 490,213 Less accumulated depreciation and amortization 288,956 282,385 Premises and equipment, net 227,589 207,828 Finance lease right-of-use assets 3,751 4,537 Assets held for sale 1,197 — Total premises and equipment, net $ 232,537 $ 212,365

Mortgage Banking (Tables)

Mortgage Banking (Tables)	12 Months Ended
	Dec. 31, 2023
Mortgage Banking [Abstract]
Schedule of Activity in the Mortgage Servicing Rights	The activity in the MSR is detailed in the table below for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 Balance at beginning of period $ 129,677 $ 87,687 Origination of servicing assets 13,712 17,843 Change in fair value: Due to market changes ( 1,489 ) 38,181 Due to runoff ( 10,030 ) ( 14,034 ) Balance at end of period $ 131,870 $ 129,677
Schedule of Mortgage Loans Sold and Serviced for Others	The table below details the mortgage loans sold and serviced for others at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 2022 Federal National Mortgage Association $ 4,826,028 $ 4,684,815 Government National Mortgage Association 3,510,983 3,350,222 Federal Home Loan Mortgage Corporation 112,352 52,023 Other 28,012 28,764 Total mortgage loans sold and serviced for others $ 8,477,375 $ 8,115,824

Goodwill and Identifiable Int_2

Goodwill and Identifiable Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill by segment	The table below illustrates goodwill by segment for the years ended December 31, 2023 and 2022 ($ in thousands): General Banking Insurance Total Balance as of January 1, 2022 $ 334,603 $ 49,634 $ 384,237 Adjustment during 2022 — — — Balance as of December 31, 2022 334,603 49,634 384,237 Adjustment during 2023 — — — Balance as of December 31, 2023 $ 334,603 $ 49,634 $ 384,237
Schedule of identifiable intangible assets	At December 31, 2023 and 2022, identifiable intangible assets consisted of the following ($ in thousands): December 31, 2023 December 31, 2022 Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Amount Amortization Amount Amount Amortization Amount Core deposit intangibles $ 87,674 $ 87,439 $ 235 $ 87,674 $ 87,199 $ 475 Insurance intangibles 17,272 14,542 2,730 17,272 14,157 3,115 Banking charters 1,325 1,325 — 1,325 1,275 50 Total $ 106,271 $ 103,306 $ 2,965 $ 106,271 $ 102,631 $ 3,640 The following table illustrates the carrying amounts and remaining weighted-average amortization periods of identifiable intangible assets at December 31, 2023 ($ in thousands): Remaining Weighted- Average Net Carrying Amortization Amount Period in Years Core deposit intangibles $ 235 3.2 Insurance intangibles 2,730 14.9 Total $ 2,965 13.9

Other Real Estate (Tables)

Other Real Estate (Tables)	12 Months Ended
	Dec. 31, 2023
Other Real Estate, Foreclosed Assets, and Repossessed 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): Years Ended December 31, 2023 2022 2021 Balance at beginning of period $ 1,986 $ 4,557 $ 11,651 Additions 7,237 1,533 770 Disposals ( 2,555 ) ( 4,142 ) ( 6,932 ) (Write-downs) recoveries 199 38 ( 932 ) Balance at end of period $ 6,867 $ 1,986 $ 4,557 Gains (losses), net on the sale of other real estate $ ( 145 ) $ ( 1,006 ) $ ( 1,869 )
Other Real Estate, By Type of Property	At December 31, 2023 and 2022, other real estate by type of property consisted of the following ($ in thousands): December 31, 2023 2022 1-4 family residential properties $ 1,977 $ 1,128 Nonfarm, nonresidential properties 4,835 561 Other real estate properties 55 297 Total other real estate $ 6,867 $ 1,986
Other Real Estate, By Geographic Location	At December 31, 2023 and 2022, other real estate by geographic location consisted of the following ($ in thousands): December 31, 2023 2022 Alabama $ 1,397 $ 194 Mississippi (1) 1,242 1,769 Tennessee (2) — 23 Texas 4,228 — Total other real estate $ 6,867 $ 1,986 (1) Mississippi includes Central and Southern Mississippi Regions. (2) Tennessee includes Memphis, Tennessee and Northern Mississippi Regions.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Components of the Trustmark's net investment in its sales-type and direct financing leases	The table below summarizes the components of Trustmark's net investment in its sales-type and direct financing leases at December 31, 2023 ($ in thousands): December 31, 2023 Leases receivable $ 161,319 Unearned income ( 29,011 ) Initial direct costs 1,326 Unguaranteed lease residual 4,101 Total net investment $ 137,735
Minimum Future Lease Payments for Trustmark's Leases Receivable	The table below details the minimum future lease payments for Trustmark's leases receivable at December 31, 2023 ($ in thousands): December 31, 2023 2024 $ 24,647 2025 25,617 2026 24,176 2027 36,295 2028 21,141 Thereafter 29,443 Total leases receivable $ 161,319
Components of Net Lease Cost	The table below details the components of net lease cost for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Finance leases Amortization of right-of-use assets $ 786 $ 1,479 $ 1,546 Interest on lease liabilities 163 188 219 Operating lease cost 5,311 5,172 5,275 Short-term lease cost 277 389 463 Variable lease cost 906 1,150 1,234 Sublease income ( 12 ) ( 168 ) ( 350 ) Net lease cost $ 7,431 $ 8,210 $ 8,387
Cash Payments Included in Measurement of Lease Liabilities	The table below details the cash payments included in the measurement of lease liabilities during the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Finance leases Operating cash flows included in operating activities $ 163 $ 188 $ 219 Financing cash flows included in payments under finance lease 721 1,409 1,434 Operating leases Operating cash flows (fixed payments) included in other operating 4,188 4,829 4,781 Operating cash flows (liability reduction) included in other operating 3,643 4,009 3,948
Balance Sheet Information and Weighted-Average Lease Terms and Discount Rates Related to Leases	The table below details balance sheet information, as well as weighted-average lease terms and discount rates, related to leases at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 2022 Finance lease right-of-use assets, net of accumulated depreciation $ 3,751 $ 4,537 Finance lease liabilities 4,334 5,055 Operating lease right-of-use assets 38,142 36,301 Operating lease liabilities 41,584 38,932 Weighted-average lease term Finance leases 8.34 years 8.72 years Operating leases 10.13 years 9.64 years Weighted-average discount rate Finance leases 3.61 % 3.49 % Operating leases 3.64 % 3.22 %
Future Minimum Rental Commitments Under Finance and Operating Leases	At December 31, 2023, future minimum rental commitments under finance and operating leases were as follows ($ in thousands): Finance Leases Operating Leases 2024 $ 573 $ 5,051 2025 584 5,119 2026 589 4,967 2027 594 5,020 2028 599 4,860 Thereafter 2,086 25,452 Total minimum lease payments 5,025 50,469 Less imputed interest ( 691 ) ( 8,885 ) Lease liabilities $ 4,334 $ 41,584

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2023
Deposits [Abstract]
Deposits Summary	At December 31, 2023 and 2022, deposits consisted of the following ($ in thousands): December 31, 2023 2022 Noninterest-bearing demand $ 3,197,620 $ 4,093,771 Interest-bearing demand 4,947,626 4,773,219 Savings 4,047,853 4,282,435 Time 3,376,664 1,288,223 Total $ 15,569,763 $ 14,437,648
Interest Expense on Deposits by Type	Interest expense on deposits by type consisted of the following for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Interest-bearing demand $ 121,138 $ 16,409 $ 4,906 Savings 28,605 9,654 7,912 Time 96,208 3,006 4,127 Total $ 245,951 $ 29,069 $ 16,945
Maturities of Interest-Bearing Deposits	The maturities of interest-bearing deposits at December 31, 2023, are as follows ($ in thousands): 2024 $ 3,199,607 2025 142,607 2026 19,632 2027 7,433 2028 5,503 Thereafter 1,882 Total time deposits 3,376,664 Interest-bearing deposits with no stated maturity 8,995,479 Total interest-bearing deposits $ 12,372,143

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Schedule of Securities Sold Under Repurchase Agreements	The following table presents the securities sold under repurchase agreements by collateral pledged at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 2022 Mortgage-backed securities Residential mortgage pass-through securities Issued by FNMA and FHLMC $ 28,600 $ 41,732 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 526 1,111 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA — 21,277 Total securities sold under repurchase agreements $ 29,126 $ 64,120
Summary of Other Borrowings	At December 31, 2023 and 2022, other borrowings consisted of the following ($ in thousands): December 31, 2023 2022 FHLB advances $ 400,058 $ 975,078 Serviced GNMA loans eligible for repurchase 78,838 70,805 Finance lease liabilities 4,334 5,055 Total other borrowings $ 483,230 $ 1,050,938

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	12 Months Ended
	Dec. 31, 2023
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): Year Ended December 31, 2023 Year Ended December 31, 2022 Year Ended December 31, 2021 Topic 606 Not Topic (1) Total Topic 606 Not Topic (1) Total Topic 606 Not Topic (1) Total General Banking Service charges on $ 43,329 $ — $ 43,329 $ 42,073 $ — $ 42,073 $ 33,169 $ — $ 33,169 Bank card and other fees 30,387 2,995 33,382 31,474 4,584 36,058 30,897 3,727 34,624 Mortgage banking, net — 26,216 26,216 — 28,306 28,306 — 63,750 63,750 Wealth management 838 — 838 639 — 639 48 — 48 Other, net 11,769 ( 2,076 ) 9,693 8,469 805 9,274 6,621 ( 338 ) 6,283 Security gains (losses), — 39 39 — — — — — — Total noninterest $ 86,323 $ 27,174 $ 113,497 $ 82,655 $ 33,695 $ 116,350 $ 70,735 $ 67,139 $ 137,874 Wealth Management Service charges on $ 87 $ — $ 87 $ 84 $ — $ 84 $ 77 $ — $ 77 Bank card and other fees 57 — 57 47 — 47 38 — 38 Wealth management 34,254 — 34,254 34,374 — 34,374 35,142 — 35,142 Other, net 162 376 538 528 39 567 130 33 163 Total noninterest $ 34,560 $ 376 $ 34,936 $ 35,033 $ 39 $ 35,072 $ 35,387 $ 33 $ 35,420 Insurance Segment Insurance commissions $ 57,569 $ — $ 57,569 $ 53,721 $ — $ 53,721 $ 48,511 $ — $ 48,511 Other, net 956 — 956 1 — 1 105 — 105 Total noninterest $ 58,525 $ — $ 58,525 $ 53,722 $ — $ 53,722 $ 48,616 $ — $ 48,616 Consolidated Service charges on $ 43,416 $ — $ 43,416 $ 42,157 $ — $ 42,157 $ 33,246 $ — $ 33,246 Bank card and other fees 30,444 2,995 33,439 31,521 4,584 36,105 30,935 3,727 34,662 Mortgage banking, net — 26,216 26,216 — 28,306 28,306 — 63,750 63,750 Insurance commissions 57,569 — 57,569 53,721 — 53,721 48,511 — 48,511 Wealth management 35,092 — 35,092 35,013 — 35,013 35,190 — 35,190 Other, net 12,887 ( 1,700 ) 11,187 8,998 844 9,842 6,856 ( 305 ) 6,551 Security gains (losses), — 39 39 — — — — — — Total noninterest $ 179,408 $ 27,550 $ 206,958 $ 171,410 $ 33,734 $ 205,144 $ 154,738 $ 67,172 $ 221,910 (1) Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card 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 securities gains (losses), net.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Tax Provision	The income tax provision included in the consolidated statements of income was as follows for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Current Federal $ 29,450 $ 15,377 $ 5,815 State 7,197 3,283 2,118 Deferred Federal ( 3,840 ) ( 13,440 ) 16,092 State ( 960 ) ( 3,360 ) 4,023 Income tax provision $ 31,847 $ 1,860 $ 28,048
Income Tax Reconciliation	For the periods presented, the income tax provision differs from the amount computed by applying the statutory federal income tax rate in effect for each respective period to income before income taxes as a result of the following ($ in thousands): Years Ended December 31, 2023 2022 2021 Income tax computed at statutory tax rate $ 41,441 $ 15,487 $ 36,837 Tax exempt interest ( 5,521 ) ( 4,419 ) ( 3,935 ) Nondeductible interest expense 2,104 271 106 State income taxes, net 5,686 2,596 1,673 Income tax credits, net ( 11,904 ) ( 10,071 ) ( 10,479 ) Death benefit gains ( 80 ) ( 287 ) ( 175 ) Other 121 ( 1,717 ) 4,021 Income tax provision $ 31,847 $ 1,860 $ 28,048
Deferred Tax Assets and Liabilities	Temporary differences between the financial statement carrying amounts and the tax basis of assets and liabilities gave rise to the following net deferred tax assets at December 31, 2023 and 2022, which are included in other assets on the accompanying consolidated balance sheets ($ in thousands): December 31, 2023 2022 Deferred tax assets: Litigation losses $ 26,647 $ 25,187 Other real estate 1,743 70 Accumulated credit losses 43,473 39,370 Deferred compensation 17,893 17,695 Finance and operating lease liabilities 11,426 10,997 Realized built-in losses 8,429 9,180 Securities 68,223 84,813 Pension and other postretirement benefit plans 2,025 1,931 Interest on nonaccrual loans 1,218 1,159 LHFS 777 205 Stock-based compensation 3,196 2,647 Derivatives 2,993 5,056 Other 10,543 10,038 Gross deferred tax asset 198,586 208,348 Deferred tax liabilities: Goodwill and other identifiable intangibles 14,297 14,378 Premises and equipment 17,382 15,978 Finance and operating lease right-of-use assets 10,420 10,209 MSR 26,271 24,452 Securities 3,181 2,069 Other 2,264 2,876 Gross deferred tax liability 73,815 69,962 Net deferred tax asset $ 124,771 $ 138,386
Changes in Unrecognized Tax Benefits	The following table provides a summary of the changes during the calendar years presented in the amount of unrecognized tax benefits that are included in other liabilities in the consolidated balance sheet ($ in thousands): December 31, 2023 2022 2021 Balance at beginning of period $ 2,316 $ 2,129 $ 1,781 Change due to tax positions taken during the current year 1,333 653 412 Change due to tax positions taken during a prior year ( 426 ) ( 266 ) 107 Change due to the lapse of applicable statute of limitations during the ( 359 ) ( 200 ) ( 171 ) Balance at end of period $ 2,864 $ 2,316 $ 2,129 Accrued interest, net of federal benefit $ 470 $ 489 $ 419 Unrecognized tax benefits that would impact the effective $ 2,518 $ 1,948 $ 1,766

Defined Benefit and Other Pos_2

Defined Benefit and Other Postretirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2023
Trustmark Capital Accumulation Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan Benefit Obligation, Plan Assets and Funded Status of the Plan	The following tables present information regarding the benefit obligation, plan assets, funded status, amounts recognized in accumulated other comprehensive loss, net periodic benefit cost and other statistical disclosures for the Continuing Plan for the periods presented ($ in thousands): December 31, 2023 2022 Change in benefit obligation: Benefit obligation, beginning of year $ 6,907 $ 8,647 Service cost 52 115 Interest cost 292 192 Actuarial (gain) loss 164 ( 1,882 ) Benefits paid ( 1,492 ) ( 165 ) Benefit obligation, end of year $ 5,923 $ 6,907 Change in plan assets: Fair value of plan assets, beginning of year $ 2,907 $ 2,900 Actual return on plan assets 237 ( 285 ) Employer contributions 751 457 Benefit payments ( 1,492 ) ( 165 ) Fair value of plan assets, end of year $ 2,403 $ 2,907 Funded status at end of year - net liability $ ( 3,520 ) $ ( 4,000 ) Amounts recognized in accumulated other comprehensive loss: Net (gain) loss - amount recognized $ ( 262 ) $ ( 271 ) Actuarial (gain) loss included in benefit obligation: Change in discount rate $ 124 $ ( 2,174 ) Change in mortality table ( 38 ) — Other 78 292 Actuarial (gain) loss $ 164 $ ( 1,882 )
Net Periodic Benefit Cost	Years Ended December 31, 2023 2022 2021 Net periodic benefit cost: Service cost $ 52 $ 115 $ 252 Interest cost 292 192 173 Expected return on plan assets ( 107 ) ( 121 ) ( 130 ) Recognized net loss due to lump sum settlements 25 — 183 Recognized net actuarial loss — 224 594 Net periodic benefit cost $ 262 $ 410 $ 1,072 Other changes in plan assets and benefit obligation recognized in other Net loss - Total recognized in other comprehensive income (loss) $ 9 $ ( 1,699 ) $ ( 1,136 ) Total recognized in net periodic benefit cost and other comprehensive $ 271 $ ( 1,289 ) $ ( 64 ) Weighted-average assumptions as of end of year: Discount rate for benefit obligation 4.67 % 4.88 % 2.41 % Discount rate for net periodic benefit cost 4.88 % 2.41 % 1.95 % Expected long-term return on plan assets 5.00 % 5.00 % 5.00 %
Weighted-Average Asset Allocation	The weighted-average asset allocations by asset category are presented below for the Continuing Plan at December 31, 2023 and 2022. December 31, 2023 2022 Money market fund 27.0 % 7.0 % Exchange traded funds: Equity securities 36.0 % 47.0 % Fixed income 28.0 % 39.0 % International 9.0 % 7.0 % Total 100.0 % 100.0 %
Plan Assets Measured at Fair Value	The following tables set forth by level, within the fair value hierarchy, the Continuing Plan’s assets measured at fair value at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 Total Level 1 Level 2 Level 3 Money market fund $ 643 $ 643 $ — $ — Exchange traded funds: Equity securities 861 861 — — Fixed income 690 690 — — International 209 209 — — Total assets at fair value $ 2,403 $ 2,403 $ — $ — December 31, 2022 Total Level 1 Level 2 Level 3 Money market fund $ 203 $ 203 $ — $ — Exchange traded funds: Equity securities 1,379 1,379 — — Fixed income 1,135 1,135 — — International 190 190 — — Total assets at fair value $ 2,907 $ 2,907 $ — $ —
Estimated Future Benefit Payments and Other Disclosures	The following table presents the expected benefit payments, which reflect expected future service, for the Continuing Plan ($ in thousands): Year Amount 2024 $ 1,312 2025 682 2026 701 2027 724 2028 428 2029 - 2033 1,396
Supplemental Retirement Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Plan Benefit Obligation, Plan Assets and Funded Status of the Plan	The following tables present information regarding the benefit obligation, plan assets, funded status, amounts recognized in accumulated other comprehensive loss, net periodic benefit cost and other statistical disclosures for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands): December 31, 2023 2022 Change in benefit obligation: Benefit obligation, beginning of year $ 43,201 $ 55,035 Service cost 69 71 Interest cost 2,013 1,278 Actuarial (gain) loss 763 ( 9,195 ) Benefits paid ( 4,427 ) ( 3,988 ) Benefit obligation, end of year $ 41,619 $ 43,201 Change in plan assets: Fair value of plan assets, beginning of year $ — $ — Employer contributions 4,427 3,988 Benefit payments ( 4,427 ) ( 3,988 ) Fair value of plan assets, end of year $ — $ — Funded status at end of year - net liability $ ( 41,619 ) $ ( 43,201 ) Amounts recognized in accumulated other comprehensive loss: Net loss $ 8,235 $ 7,756 Prior service cost 126 237 Amounts recognized $ 8,361 $ 7,993 Actuarial (gain) loss included in benefit obligation: Change in discount rate $ 649 $ ( 9,803 ) Change in mortality table ( 308 ) — Other 422 608 Actuarial (gain) loss $ 763 $ ( 9,195 )
Net Periodic Benefit Cost	Years Ended December 31, 2023 2022 2021 Net periodic benefit cost: Service cost $ 69 $ 71 $ 75 Interest cost 2,013 1,278 1,125 Amortization of prior service cost 111 111 111 Recognized net actuarial loss 284 986 1,192 Net periodic benefit cost $ 2,477 $ 2,446 $ 2,503 Other changes in plan assets and benefit obligation recognized in other Net (gain) loss $ 479 $ ( 10,181 ) $ ( 3,549 ) Amortization of prior service cost ( 111 ) ( 111 ) ( 111 ) Total recognized in other comprehensive income (loss) $ 368 $ ( 10,292 ) $ ( 3,660 ) Total recognized in net periodic benefit cost and other comprehensive $ 2,845 $ ( 7,846 ) $ ( 1,157 ) Weighted-average assumptions as of end of year: Discount rate for benefit obligation 4.67 % 4.88 % 2.41 % Discount rate for net periodic benefit cost 4.88 % 2.41 % 1.95 %
Estimated Future Benefit Payments and Other Disclosures	The following table presents the expected benefits payments for Trustmark’s supplemental retirement plans ($ in thousands): Year Amount 2024 $ 3,997 2025 3,871 2026 3,825 2027 3,641 2028 3,520 2029 - 2033 16,051

Stock and Incentive Compensat_2

Stock and Incentive Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2023
Compensation Expense for Awards Under Stock Plan	The following table presents information regarding compensation expense for units under the Stock Plan for the periods presented ($ in thousands): At December 31, 2023 Recognized Compensation Expense Unrecognized Weighted Average for Years Ended December 31, Compensation Life of Unrecognized 2023 2022 2021 Expense Compensation Expense Performance awards $ 1,772 $ 1,258 $ 828 $ 2,021 1.69 Time-based awards 4,383 3,625 4,773 3,005 1.58 Total $ 6,155 $ 4,883 $ 5,601 $ 5,026
Performance Based Award [Member]
Summary of Stock Plan Activity	The following table summarizes Trustmark’s performance unit activity for the periods presented: Years Ended December 31, 2023 2022 2021 Weighted- Weighted- Weighted- Average Average Average Grant-Date Grant-Date Grant-Date Shares Fair Value Shares Fair Value Shares Fair Value Nonvested shares, beginning of year 148,416 $ 31.63 140,821 $ 31.80 145,042 $ 32.43 Granted 70,666 29.78 60,773 32.64 53,273 30.02 Released from restriction ( 39,943 ) 31.98 ( 19,723 ) 33.40 ( 44,536 ) 31.88 Forfeited ( 4,925 ) 31.41 ( 33,455 ) 33.11 ( 12,958 ) 31.28 Nonvested shares, end of year 174,214 $ 30.81 148,416 $ 31.63 140,821 $ 31.80
Time-based Awards [Member]
Summary of Stock Plan Activity	The following table summarizes Trustmark’s time-based unit activity for the periods presented: Years Ended December 31, 2023 2022 2021 Weighted- Weighted- Weighted- Average Average Average Grant-Date Grant-Date Grant-Date Shares Fair Value Shares Fair Value Shares Fair Value Nonvested shares, beginning of year 312,978 $ 30.99 337,466 $ 31.18 301,619 $ 32.24 Granted 145,003 28.59 133,307 31.85 180,847 29.85 Released from restriction ( 90,587 ) 30.90 ( 148,905 ) 32.16 ( 135,120 ) 31.77 Forfeited ( 9,142 ) 30.72 ( 8,890 ) 31.62 ( 9,880 ) 31.19 Nonvested shares, end of year 358,252 $ 30.04 312,978 $ 30.99 337,466 $ 31.18

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2023
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): Years Ended December 31, 2023 2022 2021 Balance at beginning of period $ 36,838 $ 35,623 $ 38,572 PCL, off-balance sheet credit exposures ( 2,781 ) 1,215 ( 2,949 ) Balance at end of period $ 34,057 $ 36,838 $ 35,623

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2023
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 December 31, 2023 and 2022 ($ in thousands): Actual Regulatory Capital Minimum To Be Well Amount Ratio Requirement Capitalized At December 31, 2023: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,521,665 10.04 % 7.000 % n/a Trustmark National Bank 1,602,327 10.58 % 7.000 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,581,665 10.44 % 8.500 % n/a Trustmark National Bank 1,602,327 10.58 % 8.500 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,862,246 12.29 % 10.500 % n/a Trustmark National Bank 1,759,426 11.61 % 10.500 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,581,665 8.62 % 4.00 % n/a Trustmark National Bank 1,602,327 8.75 % 4.00 % 5.00 % At December 31, 2022: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,413,672 9.74 % 7.000 % n/a Trustmark National Bank 1,501,889 10.34 % 7.000 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,473,672 10.15 % 8.500 % n/a Trustmark National Bank 1,501,889 10.34 % 8.500 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,729,499 11.91 % 10.500 % n/a Trustmark National Bank 1,634,454 11.26 % 10.500 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,473,672 8.47 % 4.00 % n/a Trustmark National Bank 1,501,889 8.65 % 4.00 % 5.00 %
Net Change in Components of Accumulated Other Comprehensive Income (Loss) and the Related Tax Effects	Before Tax Tax (Expense) Net of Tax Amount Benefit Amount Year Ended December 31, 2023 Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising during the period $ 50,537 $ ( 12,404 ) $ 38,133 Reclassification adjustment for net (gains) losses realized in net income ( 39 ) 10 ( 29 ) Change in net unrealized holding loss on securities transferred to held to maturity 15,557 ( 3,889 ) 11,668 Total securities available for sale and transferred securities 66,055 ( 16,283 ) 49,772 Pension and other postretirement benefit plans: Change in the actuarial loss of pension and other postretirement ( 691 ) 173 ( 518 ) Reclassification adjustments for changes realized in net income: Net change in prior service costs 111 ( 28 ) 83 Recognized net loss due to lump sum settlements 25 ( 6 ) 19 Change in net actuarial loss 177 ( 44 ) 133 Total pension and other postretirement benefit plans ( 378 ) 95 ( 283 ) Cash flow hedge derivatives: Change in accumulated gain (loss) on effective cash flow hedge derivatives ( 8,131 ) 2,033 ( 6,098 ) Reclassification adjustment for (gain) loss realized in net income 16,385 ( 4,096 ) 12,289 Total cash flow hedge derivatives 8,254 ( 2,063 ) 6,191 Total other comprehensive income (loss) $ 73,931 $ ( 18,251 ) $ 55,680 Year Ended December 31, 2022 Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising during the period $ ( 229,524 ) $ 57,381 $ ( 172,143 ) Change in net unrealized holding loss on securities transferred to held to maturity ( 86,033 ) 21,508 ( 64,525 ) Total securities available for sale and transferred securities ( 315,557 ) 78,889 ( 236,668 ) Pension and other postretirement benefit plans: Change in the actuarial loss of pension and other postretirement 10,792 ( 2,698 ) 8,094 Reclassification adjustments for changes realized in net income: Net change in prior service costs 111 ( 28 ) 83 Change in net actuarial loss 1,089 ( 272 ) 817 Total pension and other postretirement benefit plans 11,992 ( 2,998 ) 8,994 Cash flow hedge derivatives: Change in accumulated gain (loss) on effective cash flow hedge derivatives ( 20,685 ) 5,171 ( 15,514 ) Reclassification adjustment for (gain) loss realized in net income 460 ( 115 ) 345 Total cash flow hedge derivatives ( 20,225 ) 5,056 ( 15,169 ) Total other comprehensive income (loss) $ ( 323,790 ) $ 80,947 $ ( 242,843 ) Year Ended December 31, 2021 Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising during the period $ ( 49,454 ) $ 12,364 $ ( 37,090 ) Change in net unrealized holding loss on securities transferred to held to maturity 2,647 ( 662 ) 1,985 Total securities available for sale and transferred securities ( 46,807 ) 11,702 ( 35,105 ) Pension and other postretirement benefit plans: Change in the actuarial loss of pension and other postretirement 2,845 ( 711 ) 2,134 Reclassification adjustments for changes realized in net income: Net change in prior service costs 111 ( 27 ) 84 Recognized net loss due to lump sum settlements 183 ( 46 ) 137 Change in net actuarial loss 1,655 ( 414 ) 1,241 Total pension and other postretirement benefit plans 4,794 ( 1,198 ) 3,596 Total other comprehensive income (loss) $ ( 42,013 ) $ 10,504 $ ( 31,509 )
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 for Sale Transferred Defined Cash Flow Hedge Derivative Total Balance, January 1, 2021 $ 17,331 $ ( 18,382 ) $ — $ ( 1,051 ) Other comprehensive income (loss) before ( 35,105 ) 2,134 — ( 32,971 ) Amounts reclassified from accumulated other — 1,462 — 1,462 Net other comprehensive income (loss) ( 35,105 ) 3,596 — ( 31,509 ) Balance, December 31, 2021 ( 17,774 ) ( 14,786 ) — ( 32,560 ) Other comprehensive income (loss) before ( 236,668 ) 8,094 ( 15,514 ) ( 244,088 ) Amounts reclassified from accumulated other — 900 345 1,245 Net other comprehensive income (loss) ( 236,668 ) 8,994 ( 15,169 ) ( 242,843 ) Balance, December 31, 2022 ( 254,442 ) ( 5,792 ) ( 15,169 ) ( 275,403 ) Other comprehensive income (loss) before reclassification 49,801 ( 518 ) ( 6,098 ) 43,185 Amounts reclassified from accumulated other ( 29 ) 235 12,289 12,495 Net other comprehensive income (loss) 49,772 ( 283 ) 6,191 55,680 Balance, December 31, 2023 $ ( 204,670 ) $ ( 6,075 ) $ ( 8,978 ) $ ( 219,723 )

Fair Value (Tables)

Fair Value (Tables)	12 Months Ended
	Dec. 31, 2023
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 December 31, 2023 and 2022, 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 years ended December 31, 2023 and 2022. December 31, 2023 Total Level 1 Level 2 Level 3 U.S. Treasury securities $ 372,368 $ 372,368 $ — $ — U.S. Government agency obligations 5,792 — 5,792 — Obligations of states and political subdivisions — — — — Mortgage-backed securities 1,384,718 — 1,384,718 — Securities available for sale 1,762,878 372,368 1,390,510 — LHFS 184,812 — 184,812 — MSR 131,870 — — 131,870 Other assets - derivatives 23,316 7,685 14,786 845 Other liabilities - derivatives 35,600 21 35,579 — December 31, 2022 Total Level 1 Level 2 Level 3 U.S. Treasury securities $ 391,513 $ 391,513 $ — $ — U.S. Government agency obligations 7,766 — 7,766 — Obligations of states and political subdivisions 4,862 — 4,862 — Mortgage-backed securities 1,619,941 — 1,619,941 — Securities available for sale 2,024,082 391,513 1,632,569 — LHFS 135,226 — 135,226 — MSR 129,677 — — 129,677 Other assets - derivatives 8,871 54 8,660 157 Other liabilities - derivatives 45,379 474 44,905 —
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 years ended December 31, 2023 and 2022 are summarized as follows ($ in thousands): MSR Other Assets - Balance, January 1, 2023 $ 129,677 $ 157 Total net (loss) gain included in Mortgage banking, net (1) ( 11,519 ) 2,470 Additions 13,712 — Sales — ( 1,782 ) Balance, December 31, 2023 $ 131,870 $ 845 The amount of total gains (losses) for the period included in earnings that are $ ( 1,489 ) $ 1,103 Balance, January 1, 2022 $ 87,687 $ 1,859 Total net (loss) gain included in Mortgage banking, net (1) 24,147 ( 131 ) Additions 17,843 — Sales — ( 1,571 ) Balance, December 31, 2022 $ 129,677 $ 157 The amount of total gains (losses) for the period included in earnings that are $ 38,181 $ ( 1,214 ) (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 December 31, 2023 and 2022 were as follows ($ in thousands): December 31, 2023 December 31, 2022 Carrying Estimated Carrying Estimated Financial Assets: Level 2 Inputs: Cash and short-term investments $ 975,543 $ 975,543 $ 738,787 $ 738,787 Securities held to maturity 1,426,279 1,355,504 1,494,514 1,406,589 Level 3 Inputs: Net LHFI 12,811,157 12,762,505 12,083,825 11,850,318 Financial Liabilities: Level 2 Inputs: Deposits 15,569,763 15,553,417 14,437,648 14,404,661 Federal funds purchased and securities sold under 405,745 405,745 449,331 449,331 Other borrowings 483,230 483,226 1,050,938 1,050,932 Subordinated notes 123,482 108,125 123,262 113,125 Junior subordinated debt securities 61,856 46,856 61,856 46,392
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 the LHFS accounted for under the fair value option at December 31, 2023 and 2022 ($ in thousands): December 31, 2023 2022 Fair value of LHFS $ 105,974 $ 64,421 LHFS contractual principal outstanding 102,994 63,427 Fair value less unpaid principal $ 2,980 $ 994

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2023
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 December 31, 2023 and 2022 as well as the effect of these derivative instruments on Trustmark’s results of operations for the periods presented ($ in thousands): December 31, 2023 2022 Derivatives in hedging relationships Interest rate contracts: Interest rate swaps included in other assets (1) $ 1,182 $ — Interest rate floors included in other assets 1,689 — Interest rate swaps included in other liabilities (1) 267 761 Derivatives not designated as hedging instruments Interest rate contracts: Exchange traded purchased options included in other assets $ 180 $ 38 OTC written options (rate locks) included in other assets 845 157 Futures contracts included in other assets 7,505 16 Interest rate swaps included in other assets (1) 11,910 8,654 Credit risk participation agreements included in other assets 5 6 Futures contracts included in other liabilities — 268 Forward contracts included in other liabilities 994 ( 168 ) Exchange traded written options included in other liabilities 21 206 Interest rate swaps included in other liabilities (1) 34,255 44,304 Credit risk participation agreements included in other liabilities 63 8 (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	Years Ended December 31, 2023 2022 2021 Derivatives in hedging relationships Amount of gain (loss) reclassified from accumulated other $ ( 16,385 ) $ ( 460 ) $ — Derivatives not designated as hedging instruments Amount of gain (loss) recognized in mortgage banking, net $ ( 5,281 ) $ ( 43,764 ) $ ( 15,436 ) Amount of gain (loss) recognized in bank card and other fees 271 403 1,649
Schedule of Amount Included in Other Comprehensive Income for Derivative Instruments Designated as Hedges of Cash Flows	The following table discloses the amount included in other comprehensive income (loss), net of tax, for derivative instruments designated as cash flow hedges for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 Derivatives in cash flow hedging relationship Amount of gain (loss) recognized in other comprehensive $ ( 6,098 ) $ ( 15,514 ) $ —
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 at December 31, 2023 and 2022 is presented in the following tables ($ in thousands): Offsetting of Derivative Assets As of December 31, 2023 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts of Financial Cash Collateral Net Amount Derivatives $ 14,781 $ — $ 14,781 $ ( 4,339 ) $ — $ 10,442 Offsetting of Derivative Liabilities As of December 31, 2023 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts of Financial Cash Collateral Net Amount Derivatives $ 34,522 $ — $ 34,522 $ ( 4,339 ) $ ( 2,040 ) $ 28,143 Offsetting of Derivative Assets As of December 31, 2022 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts of the Statement of Financial Cash Collateral Net Amount Derivatives $ 9,415 $ — $ 9,415 $ — $ ( 2,230 ) $ 7,185 Offsetting of Derivative Liabilities As of December 31, 2022 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts of Financial Cash Collateral Net Amount Derivatives $ 44,304 $ — $ 44,304 $ — $ ( 740 ) $ 43,564

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Schedule of Segment Information	The following table discloses financial information by reportable segment for the periods presented ($ in thousands): Years Ended December 31, 2023 2022 2021 General Banking Net interest income $ 547,010 $ 489,398 $ 413,201 PCL 26,716 22,913 ( 24,439 ) Noninterest income 113,497 116,350 137,874 Noninterest expense 463,496 531,397 421,561 Income before income taxes 170,295 51,438 153,953 Income taxes 25,091 ( 3,683 ) 22,706 General banking net income $ 145,204 $ 55,121 $ 131,247 Selected Financial Information Total assets $ 18,440,198 $ 17,710,673 $ 17,275,438 Depreciation and amortization $ 34,924 $ 38,909 $ 44,776 Wealth Management Net interest income $ 5,879 $ 5,321 $ 5,161 PCL ( 2,135 ) ( 21 ) ( 9 ) Noninterest income 34,936 35,072 35,420 Noninterest expense 32,339 32,873 31,721 Income before income taxes 10,611 7,541 8,869 Income taxes 2,653 1,870 2,219 Wealth Management net income $ 7,958 $ 5,671 $ 6,650 Selected Financial Information Total assets $ 185,342 $ 214,313 $ 232,997 Depreciation and amortization $ 261 $ 288 $ 269 Insurance Net interest income $ ( 11 ) $ ( 11 ) $ ( 11 ) Noninterest income 58,525 53,722 48,616 Noninterest expense 42,084 38,943 36,014 Income before income taxes 16,430 14,768 12,591 Income taxes 4,103 3,673 3,123 Insurance net income $ 12,327 $ 11,095 $ 9,468 Selected Financial Information Total assets $ 96,649 $ 90,492 $ 87,201 Depreciation and amortization $ 571 $ 685 $ 768 Consolidated Net interest income $ 552,878 $ 494,708 $ 418,351 PCL 24,581 22,892 ( 24,448 ) Noninterest income 206,958 205,144 221,910 Noninterest expense 537,919 603,213 489,296 Income before income taxes 197,336 73,747 175,413 Income taxes 31,847 1,860 28,048 Consolidated net income $ 165,489 $ 71,887 $ 147,365 Selected Financial Information Total assets $ 18,722,189 $ 18,015,478 $ 17,595,636 Depreciation and amortization $ 35,756 $ 39,882 $ 45,813

Parent Company Only Financial_2

Parent Company Only Financial Information (Tables)	12 Months Ended
	Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract]
Parent Only Financial Statements	Condensed Balance Sheets December 31, 2023 2022 Assets: Investment in banks $ 1,770,392 $ 1,602,169 Other assets 77,901 76,325 Total Assets $ 1,848,293 $ 1,678,494 Liabilities and Shareholders' Equity: Accrued expense $ 1,108 $ 1,108 Subordinated notes 123,482 123,262 Junior subordinated debt securities 61,856 61,856 Shareholders' equity 1,661,847 1,492,268 Total Liabilities and Shareholders' Equity $ 1,848,293 $ 1,678,494 Condensed Statements of Income Years Ended December 31, 2023 2022 2021 Revenue: Dividends received from banks $ 67,189 $ 89,733 $ 45,284 Earnings of subsidiaries over distributions 106,388 ( 11,269 ) 108,141 Other income 163 94 95 Total Revenue 173,740 78,558 153,520 Expense: Other expense 8,251 6,671 6,155 Total Expense 8,251 6,671 6,155 Net Income $ 165,489 $ 71,887 $ 147,365 Condensed Statements of Cash Flows Years Ended December 31, 2023 2022 2021 Operating Activities: Net income $ 165,489 $ 71,887 $ 147,365 Adjustments to reconcile net income to net cash provided Net change in investment in subsidiaries ( 106,388 ) 11,269 ( 108,141 ) Other ( 797 ) ( 1,550 ) ( 2,078 ) Net cash from operating activities 58,304 81,606 37,146 Financing Activities: Common stock dividends ( 56,653 ) ( 56,679 ) ( 58,085 ) Repurchase and retirement of common stock — ( 24,604 ) ( 61,799 ) Net cash from financing activities ( 56,653 ) ( 81,283 ) ( 119,884 ) Net change in cash and cash equivalents 1,651 323 ( 82,738 ) Cash and cash equivalents at beginning of year 75,860 75,537 158,275 Cash and cash equivalents at end of year $ 77,511 $ 75,860 $ 75,537

Significant Accounting Polici_4

Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) RevenueCategory Fee Contract	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Percentage of outstanding principal to be repurchased under GNMA optional repurchase program	100%
Number of days to pass to be classified as past due LHFI	30 days
Finite-lived intangible assets, average useful life	20 years
Securities with limited marketability	$ 54,400,000	$ 72,200,000
Other-than-temporary impairment of investment in member bank stock	$ 0	0	$ 0
Number of types of interchange fees | Fee	2
Other real estate sales, net (losses) gains	$ (145,000)	$ (1,006,000)	$ (1,869,000)
Number of trust management revenue categories | RevenueCategory	5
Time period between service obligation completed and payment received from trust customer	30 days
Fisher Brown Bottrell Insurance, Inc. [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of general categories of insurance contracts | Contract	4
Credit Card Loans [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of days past due loans are to be charged-off	180 days
Commercial Credits [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of days past due for loan to be classified as nonaccrual	90 days
Non-Business Purpose Credits [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of days past due for loan to be classified as nonaccrual	120 days
Number of days past due loans are to be charged-off	120 days
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of days mortgage LHFS are retained on balance sheet	30 days
Minimum [Member] | Fisher Brown Bottrell Insurance, Inc. [Member] | Personal Insurance Contracts [Member]
Summary Of Significant Accounting Policies [Line Items]
Insurance contracts payment received period	30 days
Minimum [Member] | Fisher Brown Bottrell Insurance, Inc. [Member] | Employee Benefits Insurance Contracts [Member]
Summary Of Significant Accounting Policies [Line Items]
Insurance contracts payment received period	60 days
Minimum [Member] | Furniture and Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	3 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of days mortgage LHFS are retained on balance sheet	45 days
Maximum [Member] | Fisher Brown Bottrell Insurance, Inc. [Member] | Personal Insurance Contracts [Member]
Summary Of Significant Accounting Policies [Line Items]
Insurance contracts payment received period	60 days
Maximum [Member] | Fisher Brown Bottrell Insurance, Inc. [Member] | Employee Benefits Insurance Contracts [Member]
Summary Of Significant Accounting Policies [Line Items]
Insurance contracts payment received period	90 days
Maximum [Member] | Buildings [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	39 years
Maximum [Member] | Furniture and Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives of the assets	10 years
Maximum [Member] | 1-4 Family Residential Real Estate [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of days past due loans are to be charged-off	180 days
ASU 2016-13 [Member] | Securities Available for Sale [Member]
Summary Of Significant Accounting Policies [Line Items]
Current expected credit loss	$ 0
ASU 2022-02 [Member]
Summary Of Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2023
Change in accounting principle, accounting standards update, adopted [true false]	true
Change in accounting principle, accounting standards update, immaterial effect [true false]	true

Significant Accounting Polici_5

Significant Accounting Policies - Additional Information (Details 1) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2023-01-01	Dec. 31, 2023
Personal Insurance Contracts [Member] | Fisher Brown Bottrell Insurance, Inc. [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue recognition contract term	1 year
Employee Benefits Insurance Contracts [Member] | Fisher Brown Bottrell Insurance, Inc. [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue recognition contract term	1 year
Contingency Commission Insurance Contracts [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue recognition contract term	1 year
Maximum [Member] | Insurance Contracts [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue recognition contract term	1 year

Significant Accounting Polici_6

Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of cash flows specific transaction amounts [Abstract]
Income taxes paid	$ 38,803	$ 2,701	$ 15,259
Interest paid on deposits and borrowings	306,568	45,275	24,429
Noncash transfers from loans to other real estate	7,237	1,533	770
Securities transferred from available for sale to held to maturity	0	674,092	0
Investment in tax credit partnership not funded	3,202	18,891	10,647
Finance right-of-use assets resulting from lease liabilities	0	0	92
Operating right-of-use assets resulting from lease liabilities	$ 7,303	$ 6,912	$ 9,666

Significant Accounting Polici_7

Significant Accounting Policies - Weighted-Average Shares Used to Calculate Basic and Diluted EPS (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share (EPS) [Abstract]
Basic shares	61,054	61,242	62,788
Dilutive shares	177	190	185
Diluted shares	61,231	61,432	62,973

Significant Accounting Polici_8

Significant Accounting Policies - Weighted-Average Antidilutive Stock Awards Excluded from Determining Diluted EPS (Details) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Weighted-average antidilutive stock awards (in shares)	23,000	0	1,000

Cash and Due from Banks - Addit

Cash and Due from Banks - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023
Cash and Cash Equivalents [Abstract]
Federal reserve tax rate, percent	0%

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	Dec. 31, 2023	Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	$ 1,959,007	$ 2,270,709
Securities Available for Sale, Gross Unrealized Gains	37	380
Securities Available for Sale, Gross Unrealized (Losses)	(196,166)	(247,007)
Securities Available for Sale, Estimated Fair Value	1,762,878	2,024,082
Securities Held to Maturity, Amortized Cost	1,426,279	1,494,514
Securities Held to Maturity, Gross Unrealized Gains	51	37
Securities Held to Maturity, Gross Unrealized (Losses)	(70,826)	(87,962)
Securities Held to Maturity, Estimated Fair Value	1,355,504	1,406,589
U.S. Treasury Securities [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	396,179	425,719
Securities Available for Sale, Gross Unrealized Gains	0	308
Securities Available for Sale, Gross Unrealized (Losses)	(23,811)	(34,514)
Securities Available for Sale, Estimated Fair Value	372,368	391,513
Securities Held to Maturity, Amortized Cost	29,068	28,295
Securities Held to Maturity, Gross Unrealized Gains	0	0
Securities Held to Maturity, Gross Unrealized (Losses)	(26)	(115)
Securities Held to Maturity, Estimated Fair Value	29,042	28,180
U.S. Government Agency Obligations [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	6,207	8,297
Securities Available for Sale, Gross Unrealized Gains	1	0
Securities Available for Sale, Gross Unrealized (Losses)	(416)	(531)
Securities Available for Sale, Estimated Fair Value	5,792	7,766
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	0	4,820
Securities Available for Sale, Gross Unrealized Gains	0	53
Securities Available for Sale, Gross Unrealized (Losses)	0	(11)
Securities Available for Sale, Estimated Fair Value	0	4,862
Securities Held to Maturity, Amortized Cost	340	4,510
Securities Held to Maturity, Gross Unrealized Gains	0	3
Securities Held to Maturity, Gross Unrealized (Losses)	0	(3)
Securities Held to Maturity, Estimated Fair Value	340	4,510
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	25,744	30,534
Securities Available for Sale, Gross Unrealized Gains	4	7
Securities Available for Sale, Gross Unrealized (Losses)	(2,613)	(3,444)
Securities Available for Sale, Estimated Fair Value	23,135	27,097
Securities Held to Maturity, Amortized Cost	13,005	4,442
Securities Held to Maturity, Gross Unrealized Gains	0	0
Securities Held to Maturity, Gross Unrealized (Losses)	(497)	(395)
Securities Held to Maturity, Estimated Fair Value	12,508	4,047
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	1,338,256	1,541,570
Securities Available for Sale, Gross Unrealized Gains	32	12
Securities Available for Sale, Gross Unrealized (Losses)	(161,490)	(196,119)
Securities Available for Sale, Estimated Fair Value	1,176,798	1,345,463
Securities Held to Maturity, Amortized Cost	469,593	509,311
Securities Held to Maturity, Gross Unrealized Gains	0	0
Securities Held to Maturity, Gross Unrealized (Losses)	(18,205)	(19,586)
Securities Held to Maturity, Estimated Fair Value	451,388	489,725
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	92,076	123,755
Securities Available for Sale, Gross Unrealized Gains	0	0
Securities Available for Sale, Gross Unrealized (Losses)	(6,002)	(8,615)
Securities Available for Sale, Estimated Fair Value	86,074	115,140
Securities Held to Maturity, Amortized Cost	154,466	188,201
Securities Held to Maturity, Gross Unrealized Gains	0	0
Securities Held to Maturity, Gross Unrealized (Losses)	(10,113)	(13,826)
Securities Held to Maturity, Estimated Fair Value	144,353	174,375
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	100,545	136,014
Securities Available for Sale, Gross Unrealized Gains	0	0
Securities Available for Sale, Gross Unrealized (Losses)	(1,834)	(3,773)
Securities Available for Sale, Estimated Fair Value	98,711	132,241
Securities Held to Maturity, Amortized Cost	759,807	759,755
Securities Held to Maturity, Gross Unrealized Gains	51	34
Securities Held to Maturity, Gross Unrealized (Losses)	(41,985)	(54,037)
Securities Held to Maturity, Estimated Fair Value	$ 717,873	$ 705,752

Securities Available for Sale_4

Securities Available for Sale and Held to Maturity - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Reclassification of Securities available for sale to securities held to maturity		$ 766,000,000
Net unrealized holding loss on AFS Securities at date of transfer		(91,900,000)
Net unrealized holding losses on AFS Securities, net of tax at date of transfer		(68,900,000)
Net unamortized, unrealized loss on transfer of securities	$ (57,600,000)	(69,200,000)
Credit loss recognized	0	0
Potential credit loss exposure	340,000	4,500,000
Securities held to maturity	1,426,279,000	1,494,514,000
Pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law	2,321,000,000	2,693,000,000
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]
Securities held to maturity	0	0
Securities Available for Sale [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Accrued interest receivable	3,700,000	4,000,000
Securities Held to Maturity [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Accrued interest receivable	2,600,000	2,700,000
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		Dec. 31, 2023	Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Held to Maturity Amortized Cost		$ 1,426,279	$ 1,494,514
Aaa [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Held to Maturity Amortized Cost		1,425,939	1,490,004
Aaa1 to Aa3 [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Held to Maturity Amortized Cost		0	3,001
Not Rated [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Held to Maturity Amortized Cost	[1]	$ 340	$ 1,509
[1] Not rated securities primarily consist of Mississippi municipal general obligations.

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	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	$ 349,545	$ 2,078,165
Estimated Fair Value, 12 Months or More	2,758,879	1,342,186
Estimated Fair Value, Total	3,108,424	3,420,351
Gross Unrealized (Losses), Less than 12 Months	(3,485)	(130,121)
Gross Unrealized (Losses), 12 Months or More	(263,507)	(204,848)
Gross Unrealized (Losses), Total	(266,992)	(334,969)
US Treasury Securities [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	29,042	161,298
Estimated Fair Value, 12 Months or More	372,368	258,087
Estimated Fair Value, Total	401,410	419,385
Gross Unrealized (Losses), Less than 12 Months	(26)	(5,655)
Gross Unrealized (Losses), 12 Months or More	(23,811)	(28,974)
Gross Unrealized (Losses), Total	(23,837)	(34,629)
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	1,828
Estimated Fair Value, 12 Months or More	5,791	5,938
Estimated Fair Value, Total	5,791	7,766
Gross Unrealized (Losses), Less than 12 Months	0	(184)
Gross Unrealized (Losses), 12 Months or More	(416)	(347)
Gross Unrealized (Losses), Total	(416)	(531)
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		1,017
Estimated Fair Value, 12 Months or More		3,664
Estimated Fair Value, Total		4,681
Gross Unrealized (Losses), Less than 12 Months		(11)
Gross Unrealized (Losses), 12 Months or More		(3)
Gross Unrealized (Losses), Total		(14)
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	9,381	27,223
Estimated Fair Value, 12 Months or More	25,967	3,577
Estimated Fair Value, Total	35,348	30,800
Gross Unrealized (Losses), Less than 12 Months	(172)	(3,270)
Gross Unrealized (Losses), 12 Months or More	(2,938)	(569)
Gross Unrealized (Losses), Total	(3,110)	(3,839)
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	309,466	770,865
Estimated Fair Value, 12 Months or More	1,311,865	1,062,041
Estimated Fair Value, Total	1,621,331	1,832,906
Gross Unrealized (Losses), Less than 12 Months	(3,274)	(41,807)
Gross Unrealized (Losses), 12 Months or More	(176,421)	(173,898)
Gross Unrealized (Losses), Total	(179,695)	(215,705)
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	0	281,964
Estimated Fair Value, 12 Months or More	230,368	7,235
Estimated Fair Value, Total	230,368	289,199
Gross Unrealized (Losses), Less than 12 Months	0	(21,452)
Gross Unrealized (Losses), 12 Months or More	(16,115)	(989)
Gross Unrealized (Losses), Total	(16,115)	(22,441)
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	1,656	833,970
Estimated Fair Value, 12 Months or More	812,520	1,644
Estimated Fair Value, Total	814,176	835,614
Gross Unrealized (Losses), Less than 12 Months	(13)	(57,742)
Gross Unrealized (Losses), 12 Months or More	(43,806)	(68)
Gross Unrealized (Losses), Total	$ (43,819)	$ (57,810)

Securities Available for Sale_7

Securities Available for Sale and Held to Maturity - Gains and Losses as a Result of Calls and Disposition of Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Proceeds From Calls And Sales Of Securities	$ 4,796	$ 0	$ 0
Gross realized gains	47	0	0
Gross realized losses	$ (8)	$ 0	$ 0

Securities Available for Sale_8

Securities Available for Sale and Held to Maturity - Contractual Maturities of Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Securities Available for Sale, Amortized Cost [Abstract]
Due in one year or less	$ 65,199
Due after one year through five years	331,225
Due after five years through ten years	2,356
Due after ten years	3,606
Total amortized cost, before mortgage-backed securities	402,386
Mortgage-backed securities	1,556,621
Securities Available for Sale, Amortized Cost	1,959,007	$ 2,270,709
Securities Available for Sale, Estimated Fair Value [Abstract]
Due in one year or less	63,501
Due after one year through five years	309,108
Due after five years through ten years	2,151
Due after ten years	3,400
Total fair value, before mortgage-backed securities	378,160
Mortgage-backed securities	1,384,718
Total	1,762,878	2,024,082
Securities Held to Maturity, Amortized Cost [Abstract]
Due in one year or less	340
Due after one year through five years	29,068
Due after five years through ten years	0
Due after ten years	0
Total amortized cost, before mortgage-backed securities	29,408
Mortgage-backed securities	1,396,871
Securities Held to Maturity, Amortized Cost	1,426,279	1,494,514
Securities Held to Maturity, Estimated Fair Value [Abstract]
Due in one year or less	340
Due after one year through five years	29,042
Due after five years through ten years	0
Due after ten years	0
Total fair value, before mortgage-backed securities	29,382
Mortgage-backed securities	1,326,122
Total	$ 1,355,504	$ 1,406,589

LHFI and ACL, LHFI - Loan Portf

LHFI and ACL, LHFI - Loan Portfolio Held for Investment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loan Portfolio [Abstract]
Total LHFI	$ 12,950,524	$ 12,204,039
Less ACL, LHFI	139,367	120,214	$ 99,457	$ 117,306
Net LHFI	12,811,157	12,083,825
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	642,886	690,616
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	622,397	590,790
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	2,282,318	2,185,057
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	1,312,551	742,538
Other Construction [Member] | Other Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	867,793	1,028,926
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	3,489,434	3,278,830
Less ACL, LHFI	24,043	19,488	37,912
Commercial and Industrial Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	1,922,910	1,821,259
Less ACL, LHFI	26,638	23,140	18,939
Consumer Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	165,734	170,230
Less ACL, LHFI	5,794	5,792	4,774
State and Other Political Subdivision Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	1,088,466	1,223,863
Less ACL, LHFI	646	885	$ 2,708
Other Commercial Loans and Leases [Member]
Loan Portfolio [Abstract]
Total LHFI	556,035	471,930
Less ACL, LHFI	$ 7,072	$ 4,647

LHFI and ACL, LHFI - Additional

LHFI and ACL, LHFI - Additional Information (Details 1) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) Region	Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Accrued interest receivable	$ 71	$ 50.7
Maximum concentration of loan as a percentage of total LHFI	10%
Key market regions | Region	5
Loans and Leases Receivable, Related Parties	$ 41.1	$ 47
New loan advances to related party	287.4
Loan repayment by related party	293.2
Decrease in loans due to changes in executive officers and directors	$ 0

LHFI and ACL, LHFI - Schedule o

LHFI and ACL, LHFI - Schedule of Amortized Cost Basis of Loans on Nonaccrual Status (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	$ 27,092	$ 21,094
Total Nonaccrual	100,008	65,972
Loans Past Due 90 Days or More Still Accruing	5,790	3,929
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	2,020	137
Total Nonaccrual	2,642	1,902
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	946	482
Total Nonaccrual	6,518	3,957
Loans Past Due 90 Days or More Still Accruing	1,238	534
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	20,812	4,841
Total Nonaccrual	23,061	6,957
Loans Past Due 90 Days or More Still Accruing	54
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL		0
Total Nonaccrual	158	231
Loans Past Due 90 Days or More Still Accruing	106
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	3,235	1,193
Total Nonaccrual	43,815	19,775
Loans Past Due 90 Days or More Still Accruing	3,740	3,118
Commercial and Industrial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	79	14,441
Total Nonaccrual	22,303	25,102
Loans Past Due 90 Days or More Still Accruing	24
Consumer Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Nonaccrual	243	181
Loans Past Due 90 Days or More Still Accruing	628	277
Other Commercial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL		0
Total Nonaccrual		247
Other Commercial Loans and Leases Financing Receivable [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Nonaccrual	1,206
Loans Past Due 90 Days or More Still Accruing	0
Other construction [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	0
Total Nonaccrual	$ 62	$ 7,620

LHFI and ACL, LHFI - Aging Anal

LHFI and ACL, LHFI - Aging Analysis of Past Due and Nonaccrual LHFI by Loan Type (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	$ 12,950,524	$ 12,204,039
Total LHFI	12,950,524	12,204,039
Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	40,995	22,700
Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	13,898	6,887
Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	29,322	29,005
Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	84,215	58,592
Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	12,866,309	12,145,447
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	642,886	690,616
Total LHFI	642,886	690,616
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	93	1,972
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	507	199
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	2,362	34
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	2,962	2,205
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	639,924	688,411
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	622,397	590,790
Total LHFI	622,397	590,790
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	4,493	3,682
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,687	1,206
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	2,716	1,281
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	8,896	6,169
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	613,501	584,621
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	2,282,318	2,185,057
Total LHFI	2,282,318	2,185,057
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	19,298	10,709
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	9,327	4,236
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	22,164	9,999
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	50,789	24,944
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	2,231,529	2,160,113
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	3,489,434	3,278,830
Total LHFI	3,489,434	3,278,830
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,531	825
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,063	18
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	727	794
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	3,321	1,637
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	3,486,113	3,277,193
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,312,551	742,538
Total LHFI	1,312,551	742,538
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	126	131
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	0	30
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	207	0
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	333	161
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,312,218	742,377
Commercial and Industrial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,922,910	1,821,259
Total LHFI	1,922,910	1,821,259
Commercial and Industrial Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	11,881	1,966
Commercial and Industrial Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	484	508
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	499	8,974
Commercial and Industrial Loans [Member] | Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	12,864	11,448
Commercial and Industrial Loans [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,910,046	1,809,811
Other construction [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total LHFI	867,793	1,028,926
Other construction [Member] | Other Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	62	0
Other construction [Member] | Other Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	0	0
Other construction [Member] | Other Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	0	7,620
Other construction [Member] | Other Loans Secured by Real Estate [Member] | Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	62	7,620
Other construction [Member] | Other Loans Secured by Real Estate [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	867,731	1,021,306
Consumer Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	165,734	170,230
Total LHFI	165,734	170,230
Consumer Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	2,112	2,199
Consumer Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	772	645
Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	647	279
Consumer Loans [Member] | Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	3,531	3,123
Consumer Loans [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	162,203	167,107
State and Other Political Subdivision Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,088,466	1,223,863
Total LHFI	1,088,466	1,223,863
State and Other Political Subdivision Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	152	431
State and Other Political Subdivision Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	0	0
State and Other Political Subdivision Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	0	0
State and Other Political Subdivision Loans [Member] | Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	152	431
State and Other Political Subdivision Loans [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,088,314	1,223,432
Other Commercial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)		471,930
Total LHFI		471,930
Other Commercial Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)		785
Other Commercial Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)		45
Other Commercial Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)		24
Other Commercial Loans [Member] | Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)		854
Other Commercial Loans [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)		471,076
Other Commercial Loans and Leases [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	556,035	$ 471,930
Total LHFI	556,035
Other Commercial Loans and Leases [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,247
Other Commercial Loans and Leases [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	58
Other Commercial Loans and Leases [Member] | Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	0
Other Commercial Loans and Leases [Member] | Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,305
Other Commercial Loans and Leases [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	$ 554,730

LHFI and ACL, LHFI - Impact of

LHFI and ACL, LHFI - Impact of Modifications Classified as Troubled Debt Restructurings (Details) - Troubled Debt Restructurings [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 358
Amortized Cost Basis	$ 2,379
% of Total Class of Loan	0.02%
Post-Modification Outstanding Recorded Investment	$ 2,737
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Amortized Cost Basis	$ 805
% of Total Class of Loan	0.13%
Post-Modification Outstanding Recorded Investment	$ 805
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Amortized Cost Basis	$ 359
% of Total Class of Loan	0.01%
Post-Modification Outstanding Recorded Investment	$ 359
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Amortized Cost Basis	$ 1,148
% of Total Class of Loan	0.05%
Post-Modification Outstanding Recorded Investment	$ 1,148
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	$ 242
% of Total Class of Loan	0.01%
Post-Modification Outstanding Recorded Investment	$ 242
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Amortized Cost Basis	$ 36
% of Total Class of Loan	0.02%
Post-Modification Outstanding Recorded Investment	$ 36
Other Commercial Loans and Leases [Member]
Financing Receivable Modifications [Line Items]
Pre-Modification Outstanding Recorded Investment	116
Amortized Cost Basis	$ 31
% of Total Class of Loan	0.03%
Post-Modification Outstanding Recorded Investment	$ 147

LHFI and ACL, LHFI - Troubled d

LHFI and ACL, LHFI - Troubled debt restructurings on financial effect (Details) - Troubled Debt Restructurings [Member]	12 Months Ended
	Dec. 31, 2023
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Modified [Line Items]
Term Extension - Financial Effect	One loan renewed and extended maturity by six months
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured By Real Estate [Member]
Financing Receivable, Modified [Line Items]
Term Extension - Financial Effect	Extended amortization with term adjusted by weighted-average 3.4 years
Weighted average amortization period	3 years 4 months 24 days
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Modified [Line Items]
Term Extension - Financial Effect	Modifed lines of credit to amortize over 12 month and 24 month terms
Commercial and Industrial Loans [Member]
Financing Receivable, Modified [Line Items]
Term Extension - Payment Concessions	Six month payment deferrals
Consumer Loans [Member]
Financing Receivable, Modified [Line Items]
Term Extension - Financial Effect	Bankruptcies extended amortization with term adjusted by weighted average 1.3 years reducing borrower payment
Weighted average amortization period	1 year 3 months 18 days
Other Commercial Loans and Leases [Member]
Financing Receivable, Modified [Line Items]
Term Extension - Financial Effect	One loan renewed and extended maturity by seven months
Term Extension - Payment Concessions	Six month payment deferrals

LHFI and ACL, LHFI - Troubled_2

LHFI and ACL, LHFI - Troubled Debt Restructuring Subsequently Defaulted (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Troubled Debt Restructurings [Member] | Other Commercial Loans and Leases [Member]
Financing Receivable Modifications [Line Items]
Recorded Investment	$ 116

LHFI and ACL, LHFI - Past Due M

LHFI and ACL, LHFI - Past Due Modifications Related To Loans Held For Investment (Details) - Troubled Debt Restructurings [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable Modifications [Line Items]
Total	$ 2,737
30 Days or More Past Due [Member]
Financing Receivable Modifications [Line Items]
Total	371
Past Due 60 to 89 Days [Member]
Financing Receivable Modifications [Line Items]
Total	17
Past Due
Financing Receivable Modifications [Line Items]
Total	388
Current Loans
Financing Receivable Modifications [Line Items]
Total	2,349
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Total	1,148
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | 30 Days or More Past Due [Member]
Financing Receivable Modifications [Line Items]
Total	64
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due
Financing Receivable Modifications [Line Items]
Total	64
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Current Loans
Financing Receivable Modifications [Line Items]
Total	1,084
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Total	805
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | 30 Days or More Past Due [Member]
Financing Receivable Modifications [Line Items]
Total	290
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable Modifications [Line Items]
Total	17
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due
Financing Receivable Modifications [Line Items]
Total	307
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Current Loans
Financing Receivable Modifications [Line Items]
Total	498
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Total	359
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Current Loans
Financing Receivable Modifications [Line Items]
Total	359
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Total	242
Commercial and Industrial Loans [Member] | Current Loans
Financing Receivable Modifications [Line Items]
Total	242
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Total	36
Consumer Loans [Member] | 30 Days or More Past Due [Member]
Financing Receivable Modifications [Line Items]
Total	17
Consumer Loans [Member] | Past Due
Financing Receivable Modifications [Line Items]
Total	17
Consumer Loans [Member] | Current Loans
Financing Receivable Modifications [Line Items]
Total	19
Other Commercial Loans and Leases [Member]
Financing Receivable Modifications [Line Items]
Total	147
Other Commercial Loans and Leases [Member] | Current Loans
Financing Receivable Modifications [Line Items]
Total	$ 147

LHFI and ACL, LHFI - Schedule_2

LHFI and ACL, LHFI - Schedule of Amortized Cost Basis of Collateral-Dependent Loans by Class of Loans and Collateral Type (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	$ 49,082	$ 40,288
Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	27,051	15,734
Inventory and Receivables [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		233
Vehicles [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	41	395
Miscellaneous [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	21,990	23,926
Construction, Land Development and Other Land [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	2,020	1,558
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	2,020	1,558
Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	946	482
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	946
Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	20,812	4,841
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	20,812	4,841
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		482
Other Construction Financing Receivable [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		7,620
Other Construction Financing Receivable [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		7,620
Other Construction Financing Receivable [Member] | Inventory and Receivables [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		0
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	3,235	1,193
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	3,235	1,193
Commercial and Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	21,102	24,594
Commercial and Industrial Loans [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	38	40
Commercial and Industrial Loans [Member] | Inventory and Receivables [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		233
Commercial and Industrial Loans [Member] | Vehicles [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	41	395
Commercial and Industrial Loans [Member] | Miscellaneous [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	21,023	$ 23,926
Other Commercial Loans and Leases [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	967
Other Commercial Loans and Leases [Member] | Miscellaneous [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	$ 967

LHFI and ACL, LHFI - Addition_2

LHFI and ACL, LHFI - Additional Information (Details 2)	12 Months Ended
	Dec. 31, 2023 USD ($) KeyRatio	Dec. 31, 2022 USD ($)
Financing Receivable Recorded Investment [Line Items]
Number of key quality ratios | KeyRatio	6
Exposure for commercial non accrual loans to be reviewed on individual basis	$ 500,000
Exposure for modified commercial accrual loans deemed to be reviewed on individual basis	500,000
LHFS past due 90 days or more	$ 51,200,000	$ 49,300,000
Number of days used as baseline in evaluating collateral documentation exceptions for loan policy	90 days
Minimum [Member]
Financing Receivable [Abstract]
Credit amount used as baseline in evaluating loan policy	$ 100,000

LHFI and ACL, LHFI - Summary of

LHFI and ACL, LHFI - Summary of Amortized Cost Basis of Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	$ 2,557,360	$ 4,259,096
Term Loans by Origination Year, Before Latest Fiscal Year	3,821,836	2,453,559
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	2,060,977	1,652,970
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,267,991	824,439
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	662,502	354,522
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	1,121,424	1,110,471
Financing Receivable, Revolving Loans	1,458,434	1,548,982
Total LHFI	12,950,524	12,204,039
Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	29,322	29,005
Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	1,922,910	1,821,259
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	499	8,974
State and Other Political Subdivision Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	1,088,466	1,223,863
State and Other Political Subdivision Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	0	0
Other Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI		471,930
Other Commercial Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI		24
Other Commercial Loans and Leases [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	556,035	471,930
Other Commercial Loans and Leases [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	0
Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	165,734	170,230
Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	647	279
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	642,886	690,616
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	622,397	590,790
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	1,312,551	742,538
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	3,489,434	3,278,830
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	727	794
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	867,793	1,028,926
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	2,282,318	2,185,057
Commercial LHFI [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	2,158,477	3,152,466
Term Loans by Origination Year, Before Latest Fiscal Year	2,846,360	1,817,851
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	1,503,578	1,430,035
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,071,603	703,273
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	555,406	265,157
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	821,512	828,918
Financing Receivable, Revolving Loans	973,511	1,081,499
Total LHFI	9,930,447	9,279,199
Commercial LHFI [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	515,103	681,061
Term Loans by Origination Year, Before Latest Fiscal Year	501,808	271,860
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	175,718	134,724
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	93,985	45,310
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	32,026	14,374
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	45,077	69,078
Financing Receivable, Revolving Loans	559,193	604,852
Total LHFI	1,922,910	1,821,259
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	497,730	673,848
Term Loans by Origination Year, Before Latest Fiscal Year	474,737	261,962
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	158,659	120,123
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	80,646	44,994
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	31,876	14,265
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	44,972	69,078
Financing Receivable, Revolving Loans	537,527	577,749
Total LHFI	1,826,147	1,762,019
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	12,570
Term Loans by Origination Year, Before Latest Fiscal Year	10,141
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	3,149	12,421
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,381
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	110
Financing Receivable, Revolving Loans	126	6,454
Total LHFI	27,477	18,875
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	4,797	6,973
Term Loans by Origination Year, Before Latest Fiscal Year	16,872	9,845
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	13,909	2,170
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	11,958	312
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	40	74
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	80
Financing Receivable, Revolving Loans	21,528	20,625
Total LHFI	69,184	39,999
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	6	240
Term Loans by Origination Year, Before Latest Fiscal Year	58	53
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	1	10
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		4
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		35
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	25
Financing Receivable, Revolving Loans	12	24
Total LHFI	102	366
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	152,157	393,345
Term Loans by Origination Year, Before Latest Fiscal Year	247,034	223,302
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	174,812	123,350
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	99,786	39,031
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	32,118	18,876
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	377,225	424,288
Financing Receivable, Revolving Loans	5,334	1,671
Total LHFI	1,088,466	1,223,863
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	152,157	393,345
Term Loans by Origination Year, Before Latest Fiscal Year	247,034	223,302
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	174,812	123,350
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	99,786	39,031
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	32,118	18,876
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	377,225	421,588
Financing Receivable, Revolving Loans	5,334	1,671
Total LHFI	1,088,466	1,221,163
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		2,700
Total LHFI		2,700
Commercial LHFI [Member] | Other Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		93,394
Term Loans by Origination Year, Before Latest Fiscal Year		40,104
Term Loans by Origination Year, Two Years Before Latest Fiscal Year		28,239
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		37,607
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		6,440
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year		11,963
Financing Receivable, Revolving Loans		254,183
Total LHFI		471,930
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		88,763
Term Loans by Origination Year, Before Latest Fiscal Year		40,006
Term Loans by Origination Year, Two Years Before Latest Fiscal Year		28,239
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		37,607
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		6,424
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year		10,829
Financing Receivable, Revolving Loans		244,882
Total LHFI		456,750
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		879
Total LHFI		879
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		3,728
Term Loans by Origination Year, Before Latest Fiscal Year		98
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		16
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year		1,134
Financing Receivable, Revolving Loans		9,301
Total LHFI		14,277
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		24
Total LHFI		24
Commercial LHFI [Member] | Other Commercial Loans and Leases [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	211,508
Term Loans by Origination Year, Before Latest Fiscal Year	49,158
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	30,113
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	21,585
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	32,837
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	8,488
Financing Receivable, Revolving Loans	202,346
Total LHFI	556,035
Commercial LHFI [Member] | Other Commercial Loans and Leases [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	211,402
Term Loans by Origination Year, Before Latest Fiscal Year	48,947
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	30,071
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	21,377
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	32,837
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	8,468
Financing Receivable, Revolving Loans	201,339
Total LHFI	554,441
Commercial LHFI [Member] | Other Commercial Loans and Leases [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	208
Financing Receivable, Revolving Loans	20
Total LHFI	228
Commercial LHFI [Member] | Other Commercial Loans and Leases [Member] | Substandard - RR 8 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	106
Term Loans by Origination Year, Before Latest Fiscal Year	211
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	42
Financing Receivable, Revolving Loans	987
Total LHFI	1,346
Commercial LHFI [Member] | Other Commercial Loans and Leases [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	20
Total LHFI	20
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	360,419	363,970
Term Loans by Origination Year, Before Latest Fiscal Year	99,078	119,926
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	36,967	29,632
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	10,610	4,820
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	2,036	1,016
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	2,006	2,406
Financing Receivable, Revolving Loans	52,351	64,997
Total LHFI	563,467	586,767
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	359,813	363,824
Term Loans by Origination Year, Before Latest Fiscal Year	98,742	119,727
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	35,095	29,632
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	10,591	3,405
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	2,036	1,016
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	1,961	2,364
Financing Receivable, Revolving Loans	52,351	64,953
Total LHFI	560,589	584,921
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	360
Total LHFI	360
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	606	146
Term Loans by Origination Year, Before Latest Fiscal Year	336	199
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	1,512
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	19	1,415
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	21
Financing Receivable, Revolving Loans		44
Total LHFI	2,494	1,804
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	24	42
Total LHFI	24	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	33,292	42,726
Term Loans by Origination Year, Before Latest Fiscal Year	31,467	33,441
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	29,364	17,307
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	14,341	9,429
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	8,164	7,018
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	3,128	3,155
Financing Receivable, Revolving Loans	10,175	12,209
Total LHFI	129,931	125,285
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	33,072	41,996
Term Loans by Origination Year, Before Latest Fiscal Year	30,760	33,346
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	29,159	17,215
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	14,309	9,341
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	8,084	6,798
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	2,822	2,870
Financing Receivable, Revolving Loans	10,077	12,209
Total LHFI	128,283	123,775
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		29
Term Loans by Origination Year, Before Latest Fiscal Year	82	64
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	48	17
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	10
Total LHFI	140	110
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	220	686
Term Loans by Origination Year, Before Latest Fiscal Year	625	31
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	157	75
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	22	88
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	80	220
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	306	285
Financing Receivable, Revolving Loans	98
Total LHFI	1,508	1,385
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		15
Total LHFI		15
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	194,309	293,081
Term Loans by Origination Year, Before Latest Fiscal Year	463,340	156,386
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	332,818	143,423
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	210,047	107,827
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	91,905	11,302
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	11,119	17,694
Financing Receivable, Revolving Loans	8,880	12,642
Total LHFI	1,312,418	742,355
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	194,141	293,051
Term Loans by Origination Year, Before Latest Fiscal Year	447,200	156,386
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	332,818	143,114
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	209,757	107,827
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	56,024	11,297
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	11,080	17,626
Financing Receivable, Revolving Loans	8,880	12,516
Total LHFI	1,259,900	741,817
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, Current Fiscal Year	126
Term Loans by Origination Year, Before Latest Fiscal Year	2,076
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	35,881
Total LHFI	38,083
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		30
Term Loans by Origination Year, Before Latest Fiscal Year	14,064
Term Loans by Origination Year, Two Years Before Latest Fiscal Year		309
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	290
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		5
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	39	68
Financing Receivable, Revolving Loans		126
Total LHFI	14,393	538
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	42
Total LHFI	42
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	511,951	911,908
Term Loans by Origination Year, Before Latest Fiscal Year	936,413	658,308
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	573,903	612,972
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	607,187	458,416
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	356,320	206,131
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	374,463	300,334
Financing Receivable, Revolving Loans	129,190	130,745
Total LHFI	3,489,427	3,278,814
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	501,327	889,556
Term Loans by Origination Year, Before Latest Fiscal Year	919,519	657,242
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	526,412	603,515
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	596,240	457,163
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	323,687	205,425
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	369,250	281,828
Financing Receivable, Revolving Loans	129,142	130,052
Total LHFI	3,365,577	3,224,781
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	4,271	10,284
Term Loans by Origination Year, Before Latest Fiscal Year	14,930
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	138	271
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	23,966
Total LHFI	43,305	10,555
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	6,332	12,034
Term Loans by Origination Year, Before Latest Fiscal Year	1,964	1,066
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	47,491	9,457
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	10,809	905
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	8,614	706
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	5,200	18,488
Financing Receivable, Revolving Loans	48	693
Total LHFI	80,458	43,349
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	21	34
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		77
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	53
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	13	18
Total LHFI	87	129
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	179,738	372,981
Term Loans by Origination Year, Before Latest Fiscal Year	518,062	314,524
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	149,883	340,388
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	14,062	833
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	6
Financing Receivable, Revolving Loans	6,042	200
Total LHFI	867,793	1,028,926
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	179,676	372,981
Term Loans by Origination Year, Before Latest Fiscal Year	518,062	306,904
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	149,883	340,388
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	14,062	833
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	6
Financing Receivable, Revolving Loans	6,042	200
Total LHFI	867,731	1,021,306
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	62
Term Loans by Origination Year, Before Latest Fiscal Year		7,620
Total LHFI	62	7,620
Commercial Borrower Gross Charge-offs [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	143
Term Loans by Origination Year, Before Latest Fiscal Year	1,362
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	4,208
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	164
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	342
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	252
Financing Receivable, Revolving Loans	7
Total LHFI	6,478
Commercial Borrower Gross Charge-offs [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	42
Term Loans by Origination Year, Before Latest Fiscal Year	1,071
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	700
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	138
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	95
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	108
Financing Receivable, Revolving Loans	7
Total LHFI	2,161
Commercial Borrower Gross Charge-offs [Member] | Other Commercial Loans and Leases [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	40
Term Loans by Origination Year, Before Latest Fiscal Year	248
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	26
Total LHFI	314
Commercial Borrower Gross Charge-offs [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, Before Latest Fiscal Year	4
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	10
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	228
Total LHFI	242
Commercial Borrower Gross Charge-offs [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, Two Years Before Latest Fiscal Year	24
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	6
Total LHFI	30
Commercial Borrower Gross Charge-offs [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Before Latest Fiscal Year	39
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	82
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	19
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	138
Total LHFI	278
Commercial Borrower Gross Charge-offs [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	61
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	3,392
Total LHFI	3,453
Consumer LHFI [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	398,883	1,106,630
Term Loans by Origination Year, Before Latest Fiscal Year	975,476	635,708
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	557,399	222,935
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	196,388	121,166
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	107,096	89,365
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	299,912	281,553
Financing Receivable, Revolving Loans	484,923	467,483
Total LHFI	3,020,077	2,924,840
Consumer LHFI [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	60,878	72,396
Term Loans by Origination Year, Before Latest Fiscal Year	33,351	26,062
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	10,919	9,699
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	2,665	2,535
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	922	1,542
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	299	305
Financing Receivable, Revolving Loans	56,700	57,691
Total LHFI	165,734	170,230
Consumer LHFI [Member] | Consumer Loans [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	59,496	70,858
Term Loans by Origination Year, Before Latest Fiscal Year	32,767	25,771
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	10,698	9,514
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	2,604	2,509
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	917	1,513
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	294	295
Financing Receivable, Revolving Loans	55,321	56,508
Total LHFI	162,097	166,968
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	1,274	1,431
Term Loans by Origination Year, Before Latest Fiscal Year	475	238
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	134	159
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	34	8
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	5	23
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	5	10
Financing Receivable, Revolving Loans	839	946
Total LHFI	2,766	2,815
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	64	28
Term Loans by Origination Year, Before Latest Fiscal Year	44	12
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	3	7
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1	1
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		2
Financing Receivable, Revolving Loans	516	216
Total LHFI	628	266
Consumer LHFI [Member] | Consumer Loans [Member] | Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	44	79
Term Loans by Origination Year, Before Latest Fiscal Year	65	41
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	84	19
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	26	17
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		4
Financing Receivable, Revolving Loans	24	21
Total LHFI	243	181
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	44,912	62,049
Term Loans by Origination Year, Before Latest Fiscal Year	23,360	33,075
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	6,121	3,304
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,203	1,795
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1,112	1,694
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	2,058	1,932
Financing Receivable, Revolving Loans	653
Total LHFI	79,419	103,849
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	44,912	62,049
Term Loans by Origination Year, Before Latest Fiscal Year	23,110	32,867
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	5,973	3,304
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,203	1,759
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1,082	1,679
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	1,864	1,915
Financing Receivable, Revolving Loans	653
Total LHFI	78,797	103,573
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	250	150
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		36
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	30	15
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	191	9
Total LHFI	471	210
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, Before Latest Fiscal Year		58
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	148
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	3	8
Total LHFI	151	66
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	29,869	25,509
Term Loans by Origination Year, Before Latest Fiscal Year	11,774	8,042
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	5,855	5,408
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	4,483	5,049
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	4,364	3,713
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	8,551	7,992
Financing Receivable, Revolving Loans	427,570	409,792
Total LHFI	492,466	465,505
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	29,636	25,402
Term Loans by Origination Year, Before Latest Fiscal Year	11,366	7,983
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	5,733	5,389
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	4,471	4,894
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	4,313	3,701
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	7,674	7,252
Financing Receivable, Revolving Loans	417,383	403,123
Total LHFI	480,576	457,744
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	225	19
Term Loans by Origination Year, Before Latest Fiscal Year	68	35
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	74	15
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	4	134
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	51	5
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	220	286
Financing Receivable, Revolving Loans	4,292	3,197
Total LHFI	4,934	3,691
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, Before Latest Fiscal Year	264
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		1
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	41
Financing Receivable, Revolving Loans	934	452
Total LHFI	1,239	453
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	8	88
Term Loans by Origination Year, Before Latest Fiscal Year	76	24
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	48	4
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	8	20
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		7
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	616	454
Financing Receivable, Revolving Loans	4,961	3,020
Total LHFI	5,717	3,617
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, Two Years Before Latest Fiscal Year		89
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	78
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		5
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	55	89
Total LHFI	133	183
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, Two Years Before Latest Fiscal Year		89
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	78
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		5
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	55	89
Total LHFI	133	183
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, Before Latest Fiscal Year		16
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	7
Total LHFI	7	16
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, Before Latest Fiscal Year		16
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	7
Total LHFI	7	16
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	263,224	946,676
Term Loans by Origination Year, Before Latest Fiscal Year	906,991	568,513
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	534,497	204,435
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	187,959	111,787
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	100,698	82,411
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	288,949	271,235
Total LHFI	2,282,318	2,185,057
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	258,800	939,511
Term Loans by Origination Year, Before Latest Fiscal Year	878,893	559,804
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	516,324	198,769
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	180,272	109,466
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	98,552	80,249
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	277,664	262,196
Total LHFI	2,210,505	2,149,995
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	3,370	3,967
Term Loans by Origination Year, Before Latest Fiscal Year	11,293	3,752
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	5,513	2,119
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	2,121	425
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	298
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	1,664	1,906
Total LHFI	24,259	12,169
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	376	835
Term Loans by Origination Year, Before Latest Fiscal Year	1,219	777
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	1,208	272
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	682
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		134
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	255	1,100
Total LHFI	3,740	3,118
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	678	2,363
Term Loans by Origination Year, Before Latest Fiscal Year	15,586	4,180
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	11,452	3,275
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	4,884	1,896
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1,848	2,028
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	9,366	6,033
Total LHFI	43,814	$ 19,775
Consumer Borrower Gross Charge-offs [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	6,202
Term Loans by Origination Year, Before Latest Fiscal Year	1,589
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	393
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	149
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	11
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	165
Financing Receivable, Revolving Loans	2,528
Total LHFI	11,037
Consumer Borrower Gross Charge-offs [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	6,138
Term Loans by Origination Year, Before Latest Fiscal Year	559
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	167
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	43
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	1
Financing Receivable, Revolving Loans	2,381
Total LHFI	9,290
Consumer Borrower Gross Charge-offs [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, Before Latest Fiscal Year	100
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	9
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	2
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	10
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	22
Financing Receivable, Revolving Loans	147
Total LHFI	290
Consumer Borrower Gross Charge-offs [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	64
Term Loans by Origination Year, Before Latest Fiscal Year	930
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	217
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	104
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	142
Total LHFI	1,457
Financing Receivables Current Period Gross Charge-offs [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	6,345
Term Loans by Origination Year, Before Latest Fiscal Year	2,951
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	4,601
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	313
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	353
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	417
Financing Receivable, Revolving Loans	2,535
Total LHFI	$ 17,515

LHFI and ACL, LHFI - Summary _2

LHFI and ACL, LHFI - Summary of Trustmark's Portfolio Segments, Loan Classes, Loan Pools and the ACL Methodology and Loss Drivers (Details)	12 Months Ended
	Dec. 31, 2023
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	DCF
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
Commercial and Industrial Loans [Member] | Commercial and Industrial Loans [Member] | Equipment Finance Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	WARM
Loss Drivers	Southern Unemployment, Southern GDP
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 and Leases [Member] | Other Commercial Loans and Leases [Member] | Commercial and Industrial - Non-Working Capital [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Trustmark historical data
Other Commercial Loans and Leases [Member] | Other Commercial Loans and Leases [Member] | Commercial and Industrial - Working Capital [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Trustmark historical data
Other Commercial Loans and Leases [Member] | Other Commercial Loans and Leases [Member] | Other Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Prime Rate, Southern Unemployment
Other Commercial Loans and Leases [Member] | Other Commercial Loans and Leases [Member] | Equipment Finance Leases [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	WARM
Loss Drivers	Southern Unemployment, Southern GDP

LHFI and ACL, LHFI - Summary _3

LHFI and ACL, LHFI - Summary of Balance in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	$ 12,403	$ 17,687
Individually Evaluated for Credit Loss	49,082	40,288
Collectively Evaluated for Credit Loss	126,964	102,527
Collectively Evaluated for Credit Loss	12,901,442	12,163,751
Total LHFI	12,950,524	12,204,039
Total	139,367	120,214	$ 99,457	$ 117,306
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	11,436	9,946
Individually Evaluated for Credit Loss	21,102	24,594
Collectively Evaluated for Credit Loss	15,202	13,194
Collectively Evaluated for Credit Loss	1,901,808	1,796,665
Total LHFI	1,922,910	1,821,259
Total	26,638	23,140	18,939
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	0
Collectively Evaluated for Credit Loss	5,794	5,792
Collectively Evaluated for Credit Loss	165,734	170,230
Total LHFI	165,734	170,230
Total	5,794	5,792	4,774
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	0	0
Individually Evaluated for Credit Loss	0	0
Collectively Evaluated for Credit Loss	646	885
Collectively Evaluated for Credit Loss	1,088,466	1,223,863
Total LHFI	1,088,466	1,223,863
Total	646	885	2,708
Other Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	967
Individually Evaluated for Credit Loss	967
Collectively Evaluated for Credit Loss	6,105
Collectively Evaluated for Credit Loss	555,068
Total LHFI	556,035	471,930
Total	7,072	4,647
Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		0
Individually Evaluated for Credit Loss		0
Collectively Evaluated for Credit Loss		4,647
Collectively Evaluated for Credit Loss		471,930
Total LHFI		471,930
Total		4,647	5,348
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	0	121
Individually Evaluated for Credit Loss	2,020	1,558
Collectively Evaluated for Credit Loss	17,192	12,707
Collectively Evaluated for Credit Loss	640,866	689,058
Total LHFI	642,886	690,616
Total	17,192	12,828	6,079
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	946	482
Collectively Evaluated for Credit Loss	12,942	12,374
Collectively Evaluated for Credit Loss	621,451	590,308
Total LHFI	622,397	590,790
Total	12,942	12,374	10,310
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	20,812	4,841
Collectively Evaluated for Credit Loss	24,043	19,488
Collectively Evaluated for Credit Loss	3,468,622	3,273,989
Total LHFI	3,489,434	3,278,830
Total	24,043	19,488	37,912
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	0	0
Collectively Evaluated for Credit Loss	4,488	4,743
Collectively Evaluated for Credit Loss	1,312,551	742,538
Total LHFI	1,312,551	742,538
Total	4,488	4,743	4,713
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	0	7,620
Individually Evaluated for Credit Loss	0	7,620
Collectively Evaluated for Credit Loss	5,758	7,512
Collectively Evaluated for Credit Loss	867,793	1,021,306
Total LHFI	867,793	1,028,926
Total	5,758	15,132	5,968
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	3,235	1,193
Collectively Evaluated for Credit Loss	34,794	21,185
Collectively Evaluated for Credit Loss	2,279,083	2,183,864
Total LHFI	2,282,318	2,185,057
Total	$ 34,794	$ 21,185	$ 2,706

LHFI and ACL, LHFI - Change in

LHFI and ACL, LHFI - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 120,214	$ 99,457	$ 117,306
Loans charged-off	(17,515)	(11,332)	(10,275)
Recoveries	9,306	10,412	13,925
Net (charge-offs) recoveries	(8,209)	(920)	3,650
Provision for credit losses (PCL), LHFI	27,362	21,677	(21,499)
Balance at end of period	139,367	120,214	99,457
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	23,140	18,939
Loans charged-off	(2,161)	(671)
Recoveries	1,066	955
Provision for credit losses (PCL), LHFI	4,593	3,917
Balance at end of period	26,638	23,140	18,939
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,792	4,774
Loans charged-off	(9,290)	(2,125)
Recoveries	5,192	1,563
Provision for credit losses (PCL), LHFI	4,100	1,580
Balance at end of period	5,794	5,792	4,774
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	885	2,708
Loans charged-off	0	0
Recoveries	0	0
Provision for credit losses (PCL), LHFI	(239)	(1,823)
Balance at end of period	646	885	2,708
Other Commercial Loans and Leases [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,647
Loans charged-off	(314)
Recoveries	0
Provision for credit losses (PCL), LHFI	2,739
Balance at end of period	7,072	4,647
Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,647	5,348
Loans charged-off		(7,341)
Recoveries		3,890
Provision for credit losses (PCL), LHFI		2,750
Balance at end of period		4,647	5,348
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	12,828	6,079
Loans charged-off	(242)	(226)
Recoveries	142	1,280
Provision for credit losses (PCL), LHFI	4,464	5,695
Balance at end of period	17,192	12,828	6,079
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	12,374	10,310
Loans charged-off	(320)	(225)
Recoveries	439	597
Provision for credit losses (PCL), LHFI	449	1,692
Balance at end of period	12,942	12,374	10,310
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	19,488	37,912
Loans charged-off	(278)	(306)
Recoveries	2,328	1,724
Provision for credit losses (PCL), LHFI	2,505	(19,842)
Balance at end of period	24,043	19,488	37,912
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	4,743	4,713
Loans charged-off	0	(131)
Recoveries	28	14
Provision for credit losses (PCL), LHFI	(283)	147
Balance at end of period	4,488	4,743	4,713
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	15,132	5,968
Loans charged-off	(3,453)	(153)
Recoveries	73	222
Provision for credit losses (PCL), LHFI	(5,994)	9,095
Balance at end of period	5,758	15,132	5,968
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	21,185	2,706
Loans charged-off	(1,457)	(154)
Recoveries	38	167
Provision for credit losses (PCL), LHFI	15,028	18,466
Balance at end of period	$ 34,794	$ 21,185	$ 2,706

Premises and Equipment, Net - P

Premises and Equipment, Net - Premises and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Premises and Equipment, Net, by Type [Abstract]
Total cost of premises and equipment	$ 516,545	$ 490,213
Less accumulated depreciation and amortization	288,956	282,385
Premises and equipment, net	227,589	207,828
Finance lease right-of-use assets	3,751	4,537
Assets held for sale	1,197	0
Total premises and equipment, net	232,537	212,365
Land [Member]
Premises and Equipment, Net, by Type [Abstract]
Total cost of premises and equipment	56,747	54,300
Building and Leasehold Improvements [Member]
Premises and Equipment, Net, by Type [Abstract]
Total cost of premises and equipment	247,173	237,215
Furniture and Equipment [Member]
Premises and Equipment, Net, by Type [Abstract]
Total cost of premises and equipment	$ 212,625	$ 198,698

Premises and Equipment, Net - A

Premises and Equipment, Net - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Property	Dec. 31, 2022 USD ($) Property	Dec. 31, 2021 USD ($)
Property, Plant and Equipment [Abstract]
Number of property held for sale | Property	3	0
Property valuation adjustments	$ 470	$ 400	$ 140
Premises and Equipment, Net, by Type [Abstract]
Depreciation and amortization of premises and equipment	$ 17,400	$ 16,200	$ 15,600

Mortgage Banking - Schedule of

Mortgage Banking - Schedule of Activity in the Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Mortgage servicing rights [Abstract]
Balance at beginning of period	$ 129,677	$ 87,687
Origination of servicing assets	13,712	17,843
Change in fair value [Abstract]
Due to market changes	$ 1,489	$ 38,181
Servicing Asset, Fair Value, Change in Fair Value, Valuation Input, Statement of Income or Comprehensive Income [Extensible Enumeration]	Mortgage Banking Income	Mortgage Banking Income
Due to runoff	$ (10,030)	$ (14,034)
Balance at end of period	$ 131,870	$ 129,677

Mortgage Banking - Additional I

Mortgage Banking - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) CPR	Dec. 31, 2022 USD ($) CPR	Dec. 31, 2021 USD ($)
Schedule of changes in the reserve for mortgage loan [Abstract]
Assumed average prepayment speed | CPR	9	8
Average discount rate (in hundredths)	10.07%	10.08%
Annual servicing fee	$ 26,900	$ 26,000	$ 25,100
Servicing fee income percentage of outstanding balance of underlying loans (in hundredths)	0.32%
Mortgage servicing rights [Abstract]
Residential mortgage loans sold	$ 1,136,000	1,243,000	2,286,000
Gains on sales of residential mortgage loans	$ 15,300	20,200	$ 56,000
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	Dec. 31, 2023	Dec. 31, 2022
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	$ 8,477,375	$ 8,115,824
Federal National Mortgage Association [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	4,826,028	4,684,815
Government National Mortgage Association [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	3,510,983	3,350,222
Federal Home Loan Mortgage Corporation [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	112,352	52,023
Other [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	$ 28,012	$ 28,764

Goodwill and Identifiable Int_3

Goodwill and Identifiable Intangible Assets - Goodwill by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 384,237	$ 384,237
Adjustment	0	0
Balance, end of period	384,237	384,237
General Banking [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	334,603	334,603
Adjustment	0	0
Balance, end of period	334,603	334,603
Insurance [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	49,634	49,634
Adjustment	0	0
Balance, end of period	$ 49,634	$ 49,634

Goodwill and Identifiable Int_4

Goodwill and Identifiable Intangible Assets - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Amortization expense of identifiable intangible assets	$ 675,000	$ 1,400,000	$ 2,300,000
Impairment losses on identifiable intangible assets	0	0	0
Future amortization expense for identifiable intangible assets [Abstract]
2024	469,000
2025	403,000
2026	341,000
2027	283,000
2028	250,000
General Banking And Insurance [Member]
Goodwill [Line Items]
Impairment charge	$ 0	$ 0	$ 0

Goodwill and Identifiable Int_5

Goodwill and Identifiable Intangible Assets - Schedule of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 106,271	$ 106,271
Accumulated Amortization	103,306	102,631
Net Carrying Amount	$ 2,965	3,640
Remaining Weighted-Average Amortization Periods in Years	13 years 10 months 24 days
Core Deposit Intangibles [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 87,674	87,674
Accumulated Amortization	87,439	87,199
Net Carrying Amount	$ 235	475
Remaining Weighted-Average Amortization Periods in Years	3 years 2 months 12 days
Insurance Intangibles [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 17,272	17,272
Accumulated Amortization	14,542	14,157
Net Carrying Amount	$ 2,730	3,115
Remaining Weighted-Average Amortization Periods in Years	14 years 10 months 24 days
Banking Charters [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,325	1,325
Accumulated Amortization	1,325	1,275
Net Carrying Amount	$ 0	$ 50

Other Real Estate - Changes and

Other Real Estate - Changes and Gains (Losses), Net on Other Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at beginning of period	$ 1,986	$ 4,557	$ 11,651
Additions	7,237	1,533	770
Disposals	(2,555)	(4,142)	(6,932)
(Write-downs) recoveries	(199)	(38)	(932)
Balance at end of period	6,867	1,986	4,557
Gains (losses), net on the sale of other real estate included in other real estate expense	$ (145)	$ (1,006)	$ (1,869)

Other Real Estate - Other Real

Other Real Estate - Other Real Estate, By Type of Property (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other real estate [Line Items]
Total other real estate	$ 6,867	$ 1,986	$ 4,557	$ 11,651
1 - 4 Family Residential Properties [Member]
Other real estate [Line Items]
Total other real estate	1,977	1,128
Nonfarm, Nonresidential Properties [Member]
Other real estate [Line Items]
Total other real estate	4,835	561
Other Real Estate Properties [Member]
Other real estate [Line Items]
Total other real estate	$ 55	$ 297

Other Real Estate - Other Rea_2

Other Real Estate - Other Real Estate, By Geographic Location (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Real Estate by Geographic Location [Line Items]
Total other real estate		$ 6,867	$ 1,986	$ 4,557	$ 11,651
Alabama [Member]
Other Real Estate by Geographic Location [Line Items]
Total other real estate		1,397	194
Mississippi [Member]
Other Real Estate by Geographic Location [Line Items]
Total other real estate	[1]	1,242	1,769
Tennessee [Member]
Other Real Estate by Geographic Location [Line Items]
Total other real estate	[2]	0	23
Texas [Member]
Other Real Estate by Geographic Location [Line Items]
Total other real estate		$ 4,228	$ 0
[1] Mississippi includes Central and Southern Mississippi Regions. Tennessee includes Memphis, Tennessee and Northern Mississippi Regions.

Other Real Estate - Additional

Other Real Estate - Additional information (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Foreclosed residential real estate properties recorded as a result of obtaining physical possession of property	$ 2	$ 1.1
Consumer mortgage loans and that formal foreclosure proceedings are in process	$ 6.4	$ 2.9

Leases - Additional Information

Leases - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Interest Income from its Sales-Type and Direct Financing Leases	$ 3.2
Minimum [Member]
Lessee, Lease, Description [Line Items]
Remaining Lease Term	3 years
Maximum [Member]
Lessee, Lease, Description [Line Items]
Remaining Lease Term	10 years

Leases - Components of the Trus

Leases - Components of the Trustmark's net investment in its sales-type and direct financing leases (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Capital Leases, Net Investment in Direct Financing Leases [Abstract]
Leases receivable	$ 161,319
Unearned income	(29,011)
Initial direct costs	1,326
Unguaranteed lease residual	4,101
Total net investment	$ 137,735

Leases - Minimum Future Lease P

Leases - Minimum Future Lease Payments for Trustmark's Leases Receivable (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Sales-Type and Direct Financing Leases, Payment to be Received, Fiscal Year Maturity [Abstract]
2024	$ 24,647
2025	25,617
2026	24,176
2027	36,295
2028	21,141
Thereafter	29,443
Total leases receivable	$ 161,319

Leases - Components of Net Leas

Leases - Components of Net Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finance leases
Amortization of right-of-use assets	$ 786	$ 1,479	$ 1,546
Interest on lease liabilities	163	188	219
Operating lease cost	5,311	5,172	5,275
Short-term lease cost	277	389	463
Variable lease cost	906	1,150	1,234
Sublease income	(12)	(168)	(350)
Net lease cost	$ 7,431	$ 8,210	$ 8,387

Leases - Cash Payments Included

Leases - Cash Payments Included in Measurement of Lease liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finance leases
Operating cash flows included in operating activities	$ 163	$ 188	$ 219
Financing cash flows included in payments under finance lease obligations	721	1,409	1,434
Operating leases
Operating cash flows (fixed payments) included in other operating activities, net	4,188	4,829	4,781
Operating cash flows (liability reduction) included in other operating activities, net	$ 3,643	$ 4,009	$ 3,948

Leases - Balance Sheet Informat

Leases - Balance Sheet Information and Weighted-Average Lease Terms and Discount Rates Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Finance lease right-of-use assets, net of accumulated depreciation	$ 3,751	$ 4,537
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, Plant and Equipment, Net	Property, Plant and Equipment, Net
Finance lease liabilities	$ 4,334	$ 5,055
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Borrowings	Other Borrowings
Operating lease right-of-use assets	$ 38,142	$ 36,301
Operating lease liabilities	$ 41,584	$ 38,932
Weighted-average lease term
Finance leases	8 years 4 months 2 days	8 years 8 months 19 days
Operating leases	10 years 1 month 17 days	9 years 7 months 20 days
Weighted-average discount rate
Finance leases	3.61%	3.49%
Operating leases	3.64%	3.22%

Leases - Future Minimum Rental

Leases - Future Minimum Rental Commitments Under Finance and Operating Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Finance leases, 2024	$ 573
Finance leases, 2025	584
Finance leases, 2026	589
Finance leases, 2027	594
Finance leases, 2028	599
Finance leases, Thereafter	2,086
Finance leases, total minimum lease payments	5,025
Finance leases, imputed interest	(691)
Finance lease liabilities	4,334	$ 5,055
Operating leases, 2024	5,051
Operating leases, 2025	5,119
Operating leases, 2026	4,967
Operating leases, 2027	5,020
Operating leases, 2028	4,860
Operating leases, Thereafter	25,452
Operating leases, total minimum lease payments	50,469
Operating leases, imputed interest	(8,885)
Operating lease liabilities	$ 41,584	$ 38,932

Deposits - Deposits Summary (De

Deposits - Deposits Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deposits [Abstract]
Noninterest-bearing demand	$ 3,197,620	$ 4,093,771
Interest-bearing demand	4,947,626	4,773,219
Savings	4,047,853	4,282,435
Time	3,376,664	1,288,223
Total deposits	$ 15,569,763	$ 14,437,648

Deposits - Interest Expense on

Deposits - Interest Expense on Deposits by Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest expense on deposits by type [Abstract]
Interest-bearing demand	$ 121,138	$ 16,409	$ 4,906
Savings	28,605	9,654	7,912
Time	96,208	3,006	4,127
Total	$ 245,951	$ 29,069	$ 16,945

Deposits - Additional Informati

Deposits - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deposits [Abstract]
Time deposits that exceed the FDIC insurance limit of $250 thousand	$ 822.4	$ 247.2

Deposits - Maturities of Intere

Deposits - Maturities of Interest-Bearing Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Maturities of interest-bearing deposits [Abstract]
2024	$ 3,199,607
2025	142,607
2026	19,632
2027	7,433
2028	5,503
Thereafter	1,882
Total time deposits	3,376,664	$ 1,288,223
Interest-bearing deposits with no stated maturity	8,995,479
Total interest-bearing deposits	$ 12,372,143	$ 10,343,877

Borrowings - Securities Sold Un

Borrowings - Securities Sold Under Repurchase Agreements - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Securities sold under repurchase agreements, secured by securities carrying amount	$ 61.6	$ 102.4

Borrowings - Schedule of Securi

Borrowings - Schedule of Securities Sold Under Repurchase Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements	$ 29,126	$ 64,120
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	28,600	41,732
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	526	1,111
Commercial 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	$ 0	$ 21,277

Borrowings - Summary of Other B

Borrowings - Summary of Other Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
FHLB advances	$ 400,058	$ 975,078
Serviced GNMA loans eligible for repurchase	78,838	70,805
Finance lease liabilities	4,334	5,055
Total other borrowings	$ 483,230	$ 1,050,938

Borrowings - FHLB Advances - Ad

Borrowings - FHLB Advances - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) Loan	Dec. 31, 2022 USD ($) Loan	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Weighted-average cost related to FHLB advances (in hundredths)	5.54%	4.58%
Weighted average remaining maturity	9 days	10 days
Atlanta | BancTrust [Member] | Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Number of outstanding short-term FHLB advances | Loan	0	0
Interest rate (in hundredths)	0.08%	0.08%
Debt instrument remaining maturity period	2 years 8 months 15 days	3 years 8 months 15 days
Number of outstanding long-term FHLB advances | Loan	1	1
Long-term FHLB advances	$ 58,000	$ 78,000
Atlanta | BancTrust [Member] | Fair Market Value Adjustment [Member] | Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Fair value adjustment on FHLB advances	$ 0	$ 0
Dallas [Member] | Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Number of outstanding short-term FHLB advances | Loan	5	4
Short-term FHLB advances	$ 400,000,000	$ 975,000,000
Long-term FHLB advances	0	0
Additional debt instrument borrowing capacity	4,003,000,000	3,034,000,000
Dallas [Member] | Short Term FhlbAdvances1 [Member] | Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Short-term FHLB advances	$ 50,000,000
Interest rate (in hundredths)	5.38%
Dallas [Member] | Short Term FhlbAdvances2 [Member] | Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Short-term FHLB advances	$ 125,000,000
Interest rate (in hundredths)	5.61%
Dallas [Member] | Fair Market Value Adjustment [Member] | Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Interest expense, short-term borrowings		4,800,000
Dallas [Member] | BancTrust [Member] | Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Interest expense, long-term borrowings	$ 0	$ 0	$ 0
Dallas [Member] | BancTrust [Member] | Fair Market Value Adjustment [Member]
Debt Instrument [Line Items]
Interest expense, short-term borrowings	$ 49,900,000		$ 2,000

Borrowings - Subordinated Notes

Borrowings - Subordinated Notes Payable - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Dec. 01, 2025	Dec. 31, 2020	Dec. 31, 2023	Dec. 31, 2020	Dec. 31, 2022
Debt Instrument [Line Items]
Subordinated notes			$ 123,482		$ 123,262
Subordinated Notes [Member]
Debt Instrument [Line Items]
Face amount of debt issued		$ 125,000		$ 125,000
Interest rate (in hundredths)		3.625%	3.625%	3.625%
Maturity date				Dec. 01, 2030
Underwriting discount percentage		1.20%
Proceeds from issuance of subordinated notes before deducting offering expenses		$ 123,500
Subordinated notes			$ 123,500		$ 123,300
Frequency of periodic payment			semi-annually
Subordinated Notes [Member] | Forecast
Debt Instrument [Line Items]
Frequency of periodic payment	quarterly
Variable interest rate, description	Three-Month Term Secured Overnight Financing Rate (SOFR)
Basis spread percentage (in hundredths)	3.387%

Borrowings - Junior Subordinate

Borrowings - Junior Subordinated Debt Securities - Additional information (Details) $ in Thousands		12 Months Ended
	Aug. 18, 2006 USD ($) qtr	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Variable Interest Entity [Line Items]
Junior subordinated debt securities		$ 61,856	$ 61,856
Total assets		18,722,189	18,015,478	$ 17,595,636
Total liabilities and shareholders' equity		18,722,189	18,015,478
Common securities		12,725	12,705
Net income		165,489	71,887	147,365
Trustmark Preferred Capital Trust I [Member] | Junior Subordinated Debt Securities [Member]
Variable Interest Entity [Line Items]
Face amount of debt issued	$ 60,000
Maturity date	Sep. 30, 2036
Variable interest rate, description	three-month Chicago Mercantile Exchange, Inc. (CME) SOFR
Basis spread over SOFR rate (in hundredths)	0.26%
Debt instrument interest rate margin	1.72%
Junior subordinated debt securities	$ 61,900
Consecutive quarters that Trustmark may defer interest payments | qtr	20
Total assets		61,900	61,900
Total liabilities and shareholders' equity		61,900	61,900
Trust preferred securities		60,000		60,000
Common securities		1,900	1,900
Net income		132	66	36
Dividends paid		$ 132	$ 66	$ 36

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Summary of Noninterest Income Disaggregated by Reportable Operating Segment and Revenue Stream (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		$ 43,416	$ 42,157	$ 33,246
Bank card and other fees		33,439	36,105	34,662
Mortgage banking, net		26,216	28,306	63,750
Insurance commissions		57,569	53,721	48,511
Wealth management		35,092	35,013	35,190
Other, net		11,187	9,842	6,551
Security gains (losses), net		39
Total Noninterest Income		206,958	205,144	221,910
Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		43,416	42,157	33,246
Bank card and other fees		30,444	31,521	30,935
Insurance commissions		57,569	53,721	48,511
Wealth management		35,092	35,013	35,190
Other, net		12,887	8,998	6,856
Total Noninterest Income		179,408	171,410	154,738
Not Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Bank card and other fees	[1]	2,995	4,584	3,727
Mortgage banking, net	[1]	26,216	28,306	63,750
Other, net	[1]	(1,700)	844	(305)
Security gains (losses), net	[1]	39
Total Noninterest Income	[1]	27,550	33,734	67,172
General Banking Segment [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		43,329	42,073	33,169
Bank card and other fees		33,382	36,058	34,624
Mortgage banking, net		26,216	28,306	63,750
Wealth management		838	639	48
Other, net		9,693	9,274	6,283
Security gains (losses), net		39
Total Noninterest Income		113,497	116,350	137,874
General Banking Segment [Member] | Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		43,329	42,073	33,169
Bank card and other fees		30,387	31,474	30,897
Wealth management		838	639	48
Other, net		11,769	8,469	6,621
Total Noninterest Income		86,323	82,655	70,735
General Banking Segment [Member] | Not Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Bank card and other fees	[1]	2,995	4,584	3,727
Mortgage banking, net	[1]	26,216	28,306	63,750
Other, net	[1]	(2,076)	805	(338)
Security gains (losses), net	[1]	39
Total Noninterest Income	[1]	27,174	33,695	67,139
Wealth Management Segment [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		87	84	77
Bank card and other fees		57	47	38
Wealth management		34,254	34,374	35,142
Other, net		538	567	163
Total Noninterest Income		34,936	35,072	35,420
Wealth Management Segment [Member] | Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		87	84	77
Bank card and other fees		57	47	38
Wealth management		34,254	34,374	35,142
Other, net		162	528	130
Total Noninterest Income		34,560	35,033	35,387
Wealth Management Segment [Member] | Not Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Other, net	[1]	376	39	33
Total Noninterest Income	[1]	376	39	33
Insurance Segment [Member]
Revenue From Contract With Customer [Line Items]
Insurance commissions		57,569	53,721	48,511
Other, net		956	1	105
Total Noninterest Income		58,525	53,722	48,616
Insurance Segment [Member] | Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Insurance commissions		57,569	53,721	48,511
Other, net		956	1	105
Total Noninterest Income		58,525	53,722	48,616
Insurance Segment [Member] | Not Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Total Noninterest Income	[1]	$ 0	$ 0	$ 0
[1] Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card 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 securities gains (losses), net.

Income Taxes - Income Tax Provi

Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current [Abstract]
Federal	$ 29,450	$ 15,377	$ 5,815
State	7,197	3,283	2,118
Deferred [Abstract]
Federal	(3,840)	(13,440)	16,092
State	(960)	(3,360)	4,023
Income tax provision	$ 31,847	$ 1,860	$ 28,048

Income Taxes - Income Tax Recon

Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of provision for tax from the federal rate to the effective tax rate [Abstract]
Income tax computed at statutory tax rate	$ 41,441	$ 15,487	$ 36,837
Tax exempt interest	(5,521)	(4,419)	(3,935)
Nondeductible interest expense	2,104	271	106
State income taxes, net	5,686	2,596	1,673
Income tax credits, net	(11,904)	(10,071)	(10,479)
Death benefit gains	(80)	(287)	(175)
Other	121	(1,717)	4,021
Income tax provision	$ 31,847	$ 1,860	$ 28,048

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets [Abstract]
Litigation losses	$ 26,647	$ 25,187
Other real estate	1,743	70
Accumulated credit losses	43,473	39,370
Deferred compensation	17,893	17,695
Finance and operating lease liabilities	11,426	10,997
Realized built-in losses	8,429	9,180
Securities	68,223	84,813
Pension and other postretirement benefit plans	2,025	1,931
Interest on nonaccrual loans	1,218	1,159
LHFS	777	205
Stock-based compensation	3,196	2,647
Derivatives	2,993	5,056
Other	10,543	10,038
Gross deferred tax asset	198,586	208,348
Deferred tax liabilities [Abstract]
Goodwill and other identifiable intangibles	14,297	14,378
Premises and equipment	17,382	15,978
Finance and operating lease right-of-use assets	10,420	10,209
MSR	26,271	24,452
Securities	3,181	2,069
Other	2,264	2,876
Gross deferred tax liability	73,815	69,962
Net deferred tax asset	$ 124,771	$ 138,386

Income Taxes - Changes in Unrec

Income Taxes - Changes in Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Changes in unrecognized tax benefits [Roll Forward]
Balance at beginning of period	$ 2,316	$ 2,129	$ 1,781
Change due to tax positions taken during the current year	1,333	653	412
Change due to tax positions taken during a prior year	(426)	(266)	107
Change due to the lapse of applicable statute of limitations during the current year	(359)	(200)	(171)
Balance at end of period	2,864	2,316	2,129
Accrued interest, net of federal benefit, at end of period	470	489	419
Unrecognized tax benefits that would impact the effective tax rate, if recognized, at end of period	$ 2,518	$ 1,948	$ 1,766

Defined Benefit and Other Pos_3

Defined Benefit and Other Postretirement Benefits - Plan Benefit Obligation, Plan Assets and Funded Status of the Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Trustmark Capital Accumulation Plan [Member] | Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning of year	$ 6,907	$ 8,647
Service cost	52	115	$ 252
Interest cost	292	192	173
Actuarial (gain) loss	164	(1,882)
Benefits paid	(1,492)	(165)
Benefit obligation, end of year	5,923	6,907	8,647
Change in plan assets [ Roll Forward]
Fair value of plan assets, beginning of year	2,907	2,900
Actual return on plan assets	237	(285)
Employer contributions	751	457
Benefit payments	(1,492)	(165)
Fair value of plan assets, end of year	2,403	2,907	2,900
Funded status at end of year - net liability	(3,520)	(4,000)
Amounts recognized in accumulated other comprehensive income (loss) [Abstract]
Net (gain) loss - amount recognized	(262)	(271)
Actuarial (gain) loss included in benefit obligation:
Change in discount rate	124	(2,174)
Change in mortality table	(38)	0
Other	78	292
Actuarial (gain) loss	164	(1,882)
Supplemental Retirement Plan [Member]
Change in benefit obligation [Roll Forward]
Benefit obligation, beginning of year	43,201	55,035
Service cost	69	71	75
Interest cost	2,013	1,278	1,125
Actuarial (gain) loss	763	(9,195)
Benefits paid	(4,427)	(3,988)
Benefit obligation, end of year	41,619	43,201	$ 55,035
Change in plan assets [ Roll Forward]
Employer contributions	4,427	3,988
Benefit payments	(4,427)	(3,988)
Funded status at end of year - net liability	(41,619)	(43,201)
Amounts recognized in accumulated other comprehensive income (loss) [Abstract]
Net (gain) loss - amount recognized	8,235	7,756
Prior service cost	126	237
Amounts recognized	8,361	7,993
Actuarial (gain) loss included in benefit obligation:
Change in discount rate	649	(9,803)
Change in mortality table	(308)	0
Other	422	608
Actuarial (gain) loss	$ 763	$ (9,195)

Defined Benefit and Other Pos_4

Defined Benefit and Other Postretirement Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net periodic benefit cost [Abstract]
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Immediate Recognition of Actuarial Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax
Trustmark Capital Accumulation Plan [Member] | Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions [Member]
Net periodic benefit cost [Abstract]
Service cost	$ 52	$ 115	$ 252
Interest cost	292	192	173
Expected return on plan assets	(107)	(121)	(130)
Recognized net loss due to lump sum settlements	25	0	183
Recognized net actuarial loss	0	224	594
Net periodic benefit cost	262	410	1,072
Other changes in plan assets and benefit obligation recognized in other comprehensive income (loss), before taxes:
Net loss - Total recognized in other comprehensive income (loss)	9	(1,699)	(1,136)
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 271	$ (1,289)	$ (64)
Weighted-average assumptions as of end of year [Abstract]
Discount rate for benefit obligation	4.67%	4.88%	2.41%
Discount rate for net periodic benefit cost	4.88%	2.41%	1.95%
Expected long-term return on plan assets	5%	5%	5%
Supplemental Retirement Plan [Member]
Net periodic benefit cost [Abstract]
Service cost	$ 69	$ 71	$ 75
Interest cost	2,013	1,278	1,125
Amortization of prior service cost	111	111	111
Recognized net actuarial loss	284	986	1,192
Net periodic benefit cost	2,477	2,446	2,503
Other changes in plan assets and benefit obligation recognized in other comprehensive income (loss), before taxes:
Net (gain) loss	479	(10,181)	(3,549)
Amortization of prior service cost	(111)	(111)	(111)
Net loss - Total recognized in other comprehensive income (loss)	368	(10,292)	(3,660)
Total recognized in net periodic benefit cost and other comprehensive income (loss)	$ 2,845	$ (7,846)	$ (1,157)
Weighted-average assumptions as of end of year [Abstract]
Discount rate for benefit obligation	4.67%	4.88%	2.41%
Discount rate for net periodic benefit cost	4.88%	2.41%	1.95%

Defined Benefit and Other Pos_5

Defined Benefit and Other Postretirement Benefits - Weighted-Average Asset Allocation (Details) - Trustmark Capital Accumulation Plan [Member] - Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions [Member]	Dec. 31, 2023	Dec. 31, 2022
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	100%	100%
Money Market Funds [Member]
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	27%	7%
Exchange Traded Equity Securities Funds [Member]
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	36%	47%
Exchange Traded Fixed Income Funds [Member]
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	28%	39%
International Exchange Traded Funds [Member]
Asset target allocations [Abstract]
Weighted-average asset allocation (in hundredths)	9%	7%

Defined Benefit and Other Pos_6

Defined Benefit and Other Postretirement Benefits - Plan Assets Measured at Fair Value (Details) - Trustmark Capital Accumulation Plan [Member] - Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Asset target allocations [Abstract]
Fair value of plan assets	$ 2,403	$ 2,907	$ 2,900
Level 1 [Member]
Asset target allocations [Abstract]
Fair value of plan assets	2,403	2,907
Money Market Funds [Member]
Asset target allocations [Abstract]
Fair value of plan assets	643	203
Money Market Funds [Member] | Level 1 [Member]
Asset target allocations [Abstract]
Fair value of plan assets	643	203
Exchange Traded Equity Securities Funds [Member]
Asset target allocations [Abstract]
Fair value of plan assets	861	1,379
Exchange Traded Equity Securities Funds [Member] | Level 1 [Member]
Asset target allocations [Abstract]
Fair value of plan assets	861	1,379
Exchange Traded Fixed Income Funds [Member]
Asset target allocations [Abstract]
Fair value of plan assets	690	1,135
Exchange Traded Fixed Income Funds [Member] | Level 1 [Member]
Asset target allocations [Abstract]
Fair value of plan assets	690	1,135
International Exchange Traded Funds [Member]
Asset target allocations [Abstract]
Fair value of plan assets	209	190
International Exchange Traded Funds [Member] | Level 1 [Member]
Asset target allocations [Abstract]
Fair value of plan assets	$ 209	$ 190

Defined Benefit and Other Pos_7

Defined Benefit and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Trustmark Capital Accumulation Plan [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		$ 154
Trustmark's contribution to the Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions		609
Trustmark Capital Accumulation Plan [Member] | Forecast
Defined Benefit Plan Disclosure [Line Items]
Trustmark's minimum required contribution to the Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions	$ 128
Supplemental Retirement Plan [Member]
Estimated future benefit payments [Abstract]
Accumulated other comprehensive income (loss) expected to be recognized during next fiscal year as components of net periodic benefit cost		346
Accumulated other comprehensive loss expected to be recognized during next fiscal year as prior service cost		111
Defined Contribution Plan [Member]
Other Benefit Plans - Defined Contribution Plan [Abstract]
Trustmarks contribution to defined contribution plan		$ 10,800	$ 10,200	$ 9,900
Contributions up to a maximum of eligible compensation		6%
Automatically enrolled Contributions of eligible compensation		3%
Trustmark contributions to the plan		100%
Period when associates may become eligible to make elective deferral contributions after employment		60 days

Defined Benefit and Other Pos_8

Defined Benefit and Other Postretirement Benefits - Estimated Future Benefit Payments and Other Disclosures (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Supplemental Retirement Plan [Member]
Estimated future benefit payments [Abstract]
2024	$ 3,997
2025	3,871
2026	3,825
2027	3,641
2028	3,520
2029 - 2033	16,051
Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions [Member] | Trustmark Capital Accumulation Plan [Member]
Estimated future benefit payments [Abstract]
2024	1,312
2025	682
2026	701
2027	724
2028	428
2029 - 2033	$ 1,396

Stock and Incentive Compensat_3

Stock and Incentive Compensation Plans - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 shares
Performance Units [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]
Total shareholder return, performance measure	100%
Time-based Awards [Member] | Management [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Time-based Awards [Member] | Director [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	1 year
Stock and Incentive Compensation Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock available for issuance (in shares)	777,264

Stock and Incentive Compensat_4

Stock and Incentive Compensation Plans - Summary of Stock Plan Activity (Details) - Stock and Incentive Compensation Plan [Member] - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Performance Units [Member]
Shares [Roll Forward]
Nonvested shares, beginning of year (in shares)	148,416	140,821	145,042
Granted (in shares)	70,666	60,773	53,273
Released from restriction (in shares)	(39,943)	(19,723)	(44,536)
Forfeited (in shares)	(4,925)	(33,455)	(12,958)
Nonvested shares, end of year (in shares)	174,214	148,416	140,821
Weighted-Average Grant Date Fair Value [Abstract]
Nonvested shares, beginning of year (in dollars per share)	$ 31.63	$ 31.8	$ 32.43
Granted (in dollars per share)	29.78	32.64	30.02
Released from restriction (in dollars per share)	31.98	33.4	31.88
Forfeited (in dollars per share)	31.41	33.11	31.28
Nonvested shares, end of year (in dollars per share)	$ 30.81	$ 31.63	$ 31.8
Time-based Awards [Member]
Shares [Roll Forward]
Nonvested shares, beginning of year (in shares)	312,978	337,466	301,619
Granted (in shares)	145,003	133,307	180,847
Released from restriction (in shares)	(90,587)	(148,905)	(135,120)
Forfeited (in shares)	(9,142)	(8,890)	(9,880)
Nonvested shares, end of year (in shares)	358,252	312,978	337,466
Weighted-Average Grant Date Fair Value [Abstract]
Nonvested shares, beginning of year (in dollars per share)	$ 30.99	$ 31.18	$ 32.24
Granted (in dollars per share)	28.59	31.85	29.85
Released from restriction (in dollars per share)	30.9	32.16	31.77
Forfeited (in dollars per share)	30.72	31.62	31.19
Nonvested shares, end of year (in dollars per share)	$ 30.04	$ 30.99	$ 31.18

Stock and Incentive Compensat_5

Stock and Incentive Compensation Plans - Compensation Expense for Awards Under Stock Plan (Details) - Stock and Incentive Compensation Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized compensation expense	$ 6,155	$ 4,883	$ 5,601
Unrecognized compensation expense	5,026
Performance Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized compensation expense	1,772	1,258	828
Unrecognized compensation expense	$ 2,021
Weighted average life of unrecognized compensation expense	1 year 8 months 8 days
Time Based Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Recognized compensation expense	$ 4,383	$ 3,625	$ 4,773
Unrecognized compensation expense	$ 3,005
Weighted average life of unrecognized compensation expense	1 year 6 months 29 days

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Feb. 02, 2024	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Unused commitments to extend credit			$ 5,472,000	$ 4,907,000	$ 5,472,000
Litigation settlement expense				6,500	100,750	$ 0
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Potential exposure to credit loss in the event of nonperformance			144,100	$ 125,400	144,100
Letters of credit, maturity term - maximum				3 years
Collateral held, fair value			15,400	$ 31,400	$ 15,400
Settlement Agreement [Member]
Loss Contingencies [Line Items]
Litigation settlement expense		$ 6,500	100,000
Legal fees			$ 750
Settlement Agreement [Member] | Subsequent Event [Member]
Loss Contingencies [Line Items]
One-time cash payment of legal settlement	$ 100,000

Commitments and Contingencies_2

Commitments and Contingencies - Summary of Changes in ACL on Off-balance Sheet Credit Exposures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 36,838	$ 35,623	$ 38,572
PCL, off-balance sheet credit exposures	(2,781)	1,215	(2,949)
Balance at end of period	$ 34,057	$ 36,838	$ 35,623

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 05, 2023	Dec. 06, 2022	Dec. 07, 2021	Jan. 28, 2020
Stockholders Equity [Line items]
Capital conservation buffer rate	2.50%
Dividend potential for next fiscal year	$ 95.1
Period for which retained net income considered for approval	2 years
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			1,900
Repurchase shares of common stock, value			$ 61.8
Stock Repurchase Program 4 [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase						$ 100
Stock Repurchase Program 4 [Member] | Common Stock [Member]
Stockholders Equity [Line items]
Repurchase shares of common stock		789
Repurchase shares of common stock, value		$ 24.6
Stock Repurchase Program 5 [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase					$ 50
Stock Repurchase Program 6 [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase				$ 50

Shareholders' Equity - Table of

Shareholders' Equity - Table of Actual Regulatory Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
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	$ 1,521,665	$ 1,413,672
Actual Regulatory Capital Ratio	10.04%	9.74%
Minimum Regulatory Capital Required Ratio	7%	7%
Minimum Regulatory Provision to be Well-Capitalized Ratio
Trustmark Corporation [Member] | Tier 1 Capital (to Risk Weighted Assets) [Member]
Tier 1 Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount	$ 1,581,665	$ 1,473,672
Actual Regulatory Capital Ratio	10.44%	10.15%
Minimum Regulatory Capital Required Ratio	8.50%	8.50%
Minimum Regulatory Provision to be Well-Capitalized Ratio
Trustmark Corporation [Member] | Total Capital (to Risk Weighted Assets) [Member]
Total Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount	$ 1,862,246	$ 1,729,499
Actual Regulatory Capital Ratio	12.29%	11.91%
Minimum Regulatory Capital Required Ratio	10.50%	10.50%
Minimum Regulatory Provision to be Well-Capitalized Ratio
Trustmark Corporation [Member] | Tier 1 Leverage (to Average Assets) [Member]
Tier 1 Leverage (to Average Assets) [Abstract]
Actual Regulatory Capital Amount	$ 1,581,665	$ 1,473,672
Actual Regulatory Capital Ratio	8.62%	8.47%
Minimum Regulatory Capital Required Ratio	4%	4%
Minimum Regulatory Provision to be Well-Capitalized Ratio
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	$ 1,602,327	$ 1,501,889
Actual Regulatory Capital Ratio	10.58%	10.34%
Minimum Regulatory Capital Required Ratio	7%	7%
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	$ 1,602,327	$ 1,501,889
Actual Regulatory Capital Ratio	10.58%	10.34%
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	$ 1,759,426	$ 1,634,454
Actual Regulatory Capital Ratio	11.61%	11.26%
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	$ 1,602,327	$ 1,501,889
Actual Regulatory Capital Ratio	8.75%	8.65%
Minimum Regulatory Capital Required Ratio	4%	4%
Minimum Regulatory Provision to be Well-Capitalized Ratio	5%	5%

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	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax amount	$ 73,931	$ (323,790)	$ (42,013)
Other Comprehensive Income (Loss), Tax, Total	(18,251)	80,947	10,504
Other comprehensive income (loss), before reclassifications, net of tax amount	43,185	(244,088)	(32,971)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	12,495	1,245	1,462
Other comprehensive income (loss), net of tax amount	55,680	(242,843)	(31,509)
Securities Available for Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, before tax amount	50,537	(229,524)	(49,454)
Reclassification from accumulated other comprehensive income net current period before tax	(39)
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, before tax amount	15,557	(86,033)	2,647
Other comprehensive income (loss), before tax amount	66,055	(315,557)	(46,807)
Other comprehensive income (loss), before reclassifications, tax (expense) benefit	(12,404)	57,381	12,364
Reclassification from Aoci net current period tax	10
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, tax (expense) benefit	(3,889)	21,508	(662)
Other Comprehensive Income (Loss), Tax, Total	(16,283)	78,889	11,702
Other comprehensive income (loss), before reclassifications, net of tax amount	38,133	(172,143)	(37,090)
Reclassification from accumulated other comprehensive income net current period net of tax	(29)
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, net of tax amount	11,668	(64,525)	1,985
Other comprehensive income (loss), net of tax amount	49,772	(236,668)	(35,105)
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	111	111	111
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(28)	(28)	(27)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	83	83	84
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	25		183
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(6)		(46)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	19		137
Change in Net Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, before tax amount	(691)	(10,792)	2,845
Reclassification from accumulated other comprehensive income, current period, before tax amount	177	1,089	1,655
Other comprehensive income (loss), before reclassifications, tax (expense) benefit	173	(2,698)	(711)
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(44)	(272)	(414)
Other comprehensive income (loss), before reclassifications, net of tax amount	(518)	8,094	2,134
Reclassification from accumulated other comprehensive income, current period, net of tax amount	133	817	1,241
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	(378)	11,992	4,794
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	95	(2,998)	(1,198)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	(283)	8,994	$ 3,596
Cash Flow Hedge Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, before tax amount	(8,131)	(20,685)
Reclassification from accumulated other comprehensive income, current period, before tax amount	16,385	460
Other comprehensive income (loss), before tax amount	8,254	(20,225)
Other comprehensive income (loss), before reclassifications, tax (expense) benefit	2,033	5,171
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(4,096)	(115)
Other Comprehensive Income (Loss), Tax, Total	(2,063)	5,056
Other comprehensive income (loss), before reclassifications, net of tax amount	(6,098)	(15,514)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	12,289	345
Other comprehensive income (loss), net of tax amount	$ 6,191	$ (15,169)

Shareholders' Equity - Changes

Shareholders' Equity - Changes in Balances of Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 1,492,268	$ 1,741,311	$ 1,741,117
Other comprehensive income (loss) before reclassification	43,185	(244,088)	(32,971)
Amounts reclassified from accumulated other comprehensive income (loss)	(12,495)	(1,245)	(1,462)
Other comprehensive income (loss), net of tax amount	55,680	(242,843)	(31,509)
Balance	1,661,847	1,492,268	1,741,311
Securities Available for Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(254,442)	(17,774)	17,331
Other comprehensive income (loss) before reclassification	49,801	(236,668)	(35,105)
Amounts reclassified from accumulated other comprehensive income (loss)	(29)	0	0
Other comprehensive income (loss), net of tax amount	49,772	(236,668)	(35,105)
Balance	(204,670)	(254,442)	(17,774)
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(5,792)	(14,786)	(18,382)
Other comprehensive income (loss) before reclassification	(518)	8,094	2,134
Amounts reclassified from accumulated other comprehensive income (loss)	235	900	1,462
Other comprehensive income (loss), net of tax amount	(283)	8,994	3,596
Balance	(6,075)	(5,792)	(14,786)
Cash Flow Hedge Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(15,169)	0	0
Other comprehensive income (loss) before reclassification	(6,098)	(15,514)	0
Amounts reclassified from accumulated other comprehensive income (loss)	(12,289)	345	0
Other comprehensive income (loss), net of tax amount	6,191	(15,169)	0
Balance	(8,978)	(15,169)	0
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(275,403)	(32,560)	(1,051)
Balance	$ (219,723)	$ (275,403)	$ (32,560)

Fair Value - Financial Assets a

Fair Value - Financial Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 1,762,878	$ 2,024,082
Loans held for sale	184,812	135,226
Mortgage servicing rights (MSR)	131,870	129,677	$ 87,687
U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	372,368	391,513
U.S. Government Agency Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	5,792	7,766
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	4,862
Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,762,878	2,024,082
Loans held for sale	184,812	135,226
Mortgage servicing rights (MSR)	131,870	129,677
Other assets - derivatives	23,316	8,871
Other liabilities - derivatives	$ 35,600	$ 45,379
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets	Other Assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities	Other Liabilities
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	$ 372,368	$ 391,513
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	5,792	7,766
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	4,862
Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,384,718	1,619,941
Level 1 [Member] | Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	372,368	391,513
Loans held for sale	0	0
Mortgage servicing rights (MSR)	0	0
Other assets - derivatives	7,685	54
Other liabilities - derivatives	21	474
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	372,368	391,513
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	1,390,510	1,632,569
Loans held for sale	184,812	135,226
Mortgage servicing rights (MSR)	0	0
Other assets - derivatives	14,786	8,660
Other liabilities - derivatives	35,579	44,905
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	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	5,792	7,766
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	0	4,862
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	1,384,718	1,619,941
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 (MSR)	131,870	129,677
Other assets - derivatives	845	157
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	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) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Mortgage Banking Income	Mortgage Banking Income
MSR [Member] | Recurring Basis [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ 129,677	$ 87,687
Total net (loss) gain included in Mortgage banking, net	[1]	(11,519)	24,147
Additions		13,712	17,843
Sales		0	0
Ending Balance		131,870	129,677
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		(1,489)	38,181
Other Assets - Derivatives [Member] | Recurring Basis [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		157	1,859
Total net (loss) gain included in Mortgage banking, net		2,470	(131)
Additions		0	0
Sales		(1,782)	(1,571)
Ending Balance		845	157
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		$ 1,103	$ (1,214)
[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	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Outstanding balances in collateral dependent related to allowance for credit losses	$ 49,100	$ 40,300
Collateral dependent related to allowance for credit losses	12,400	17,700
Foreclosed assets re-measured after initial recognition	898	3,000
Write-downs of allowance for foreclosed assets after initial recognition	243	1,000
Noninterest gain (loss) Mortgage banking, net for changes in fair value of LHFS	2,200	(3,300)	$ (10,300)
Interest and fees on fair value option LHFS	7,800	6,800	$ 7,000
Serviced GNMA loans eligible for repurchase	$ 78,838	$ 70,805

Fair Value - Carrying Amounts a

Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity	$ 1,426,279	$ 1,494,514
Deposits	15,569,763	14,437,648
Federal funds purchased and securities sold under repurchase agreements	405,745	449,331
Other borrowings	483,230	1,050,938
Subordinated notes	123,482	123,262
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	975,543	738,787
Securities held to maturity	1,426,279	1,494,514
Deposits	15,569,763	14,437,648
Federal funds purchased and securities sold under repurchase agreements	405,745	449,331
Other borrowings	483,230	1,050,938
Subordinated notes	123,482	123,262
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	975,543	738,787
Securities held to maturity	1,355,504	1,406,589
Deposits	15,553,417	14,404,661
Federal funds purchased and securities sold under repurchase agreements	405,745	449,331
Other borrowings	483,226	1,050,932
Subordinated notes	108,125	113,125
Junior subordinated debt securities	46,856	46,392
Level 3 [Member] | Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI	12,811,157	12,083,825
Level 3 [Member] | Estimate Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI	$ 12,762,505	$ 11,850,318

Fair Value - Fair Value and the

Fair Value - Fair Value and the Contractual Principal Outstanding of the LHFS (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair value and the contractual principal outstanding of the LHFS [Abstract]
Fair value of LHFS	$ 105,974	$ 64,421
LHFS contractual principal outstanding	102,994	63,427
Fair value less unpaid principal	$ 2,980	$ 994

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) Contract	Dec. 31, 2022 USD ($) Contract	Dec. 31, 2021 USD ($)
Designated as Hedging Instrument [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total excluded components of earnings recognition	$ 57,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	1,125,000,000	$ 825,000,000
Interest and fees on LHFS and LHFI reclassified as a reduction over twelve months	13,200,000
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	$ 1,125,000,000	$ 825,000,000
Derivatives not Designated as Hedging Instruments [Member] | Beneficiary [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of risk participation agreements | Contract	6	5
Aggregate notional amount of credit risk participation agreements	$ 40,100,000	$ 50,200,000
Derivatives not Designated as Hedging Instruments [Member] | Guarantor [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of risk participation agreements | Contract	35	29
Aggregate notional amount of credit risk participation agreements	$ 304,700,000	$ 235,800,000
Derivatives not Designated as Hedging Instruments [Member] | Mortgage Servicing Rights Hedge [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	285,000,000	277,000,000
Net (negative) positive ineffectiveness on MSR fair value	(6,300,000)	(4,100,000)	$ 2,500,000
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	1,500,000,000	1,391,000,000
Termination value of derivatives	1,400,000	0
Collateral Posted	2,000,000	740,000
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	109,500,000	97,000,000
Valuation adjustment	(994,000)	168,000
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Lock Commitments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	61,900,000	68,400,000
Valuation adjustment	$ 845,000	$ 157,000

Derivative Financial Instrume_4

Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset		$ 14,781	$ 9,415
Fair value of derivative liability		34,522	44,304
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	[1]	1,182	0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	[1]	267	761
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset		1,689	0
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		5	6
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		63	8
Derivatives not Designated as Hedging Instruments [Member] | Future Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset		7,505	16
Derivatives not Designated as Hedging Instruments [Member] | Future Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability		0	268
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability		994	(168)
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		180	38
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		845	157
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]	11,910	8,654
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]	34,255	44,304
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		$ 21	$ 206
[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) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest and Fee Income, Loan and Lease, Held-in-Portfolio	Interest and Fee Income, Loan and Lease, Held-in-Portfolio	Interest and Fee Income, Loan and Lease, Held-in-Portfolio
Derivatives in Hedging Relationships [Member]
Derivatives, Fair Value [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) and recognized in interest and fees on LHFS & LHFI	$ (16,385)	$ (460)	$ 0
Derivatives not Designated as Hedging Instruments [Member] | Mortgage Banking, Net [Member]
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in mortgage banking, net	(5,281)	(43,764)	(15,436)
Derivatives not Designated as Hedging Instruments [Member] | Bank Card and Other Fees [Member]
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in bank card and other fees	$ 271	$ 403	$ 1,649

Derivative Financial Instrume_6

Derivative Financial Instruments - Schedule of Amount Included in Other Comprehensive Income (Loss) for Derivative Instruments Designated as Hedges of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss), net of tax	$ (12,289)	$ (345)	$ 0
Derivatives in Hedging Relationships [Member]
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss), net of tax	$ (6,098)	$ (15,514)	$ 0

Derivative Financial Instrume_7

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	Dec. 31, 2023	Dec. 31, 2022
Offsetting Derivative Assets
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets	$ 14,781	$ 9,415
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	14,781	9,415
Financial Instruments, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Assets	(4,339)	0
Cash Collateral Received, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Assets	0	(2,230)
Net Amount, Offsetting of Derivative Assets	10,442	7,185
Offsetting Derivative Liabilities
Gross Amounts of Recognized Liabilities, Offsetting of Derivative Liabilities	34,522	44,304
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	34,522	44,304
Financial Instruments, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities	(4,339)	0
Cash Collateral Posted, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities	(2,040)	(740)
Net Amount, Offsetting of Derivative Liabilities	$ 28,143	$ 43,564

Segment Information - Additiona

Segment Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2023 Segment
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	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net interest income	$ 552,878	$ 494,708	$ 418,351
PCL	24,581	22,892	(24,448)
Noninterest income	206,958	205,144	221,910
Noninterest expense	537,919	603,213	489,296
Income Before Income Taxes	197,336	73,747	175,413
Income taxes	31,847	1,860	28,048
Net Income	165,489	71,887	147,365
Selected Financial Information
Total assets	18,722,189	18,015,478	17,595,636
Depreciation and amortization	35,756	39,882	45,813
General Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	547,010	489,398	413,201
PCL	26,716	22,913	(24,439)
Noninterest income	113,497	116,350	137,874
Noninterest expense	463,496	531,397	421,561
Income Before Income Taxes	170,295	51,438	153,953
Income taxes	25,091	(3,683)	22,706
Net Income	145,204	55,121	131,247
Selected Financial Information
Total assets	18,440,198	17,710,673	17,275,438
Depreciation and amortization	34,924	38,909	44,776
Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest income	5,879	5,321	5,161
PCL	(2,135)	(21)	(9)
Noninterest income	34,936	35,072	35,420
Noninterest expense	32,339	32,873	31,721
Income Before Income Taxes	10,611	7,541	8,869
Income taxes	2,653	1,870	2,219
Net Income	7,958	5,671	6,650
Selected Financial Information
Total assets	185,342	214,313	232,997
Depreciation and amortization	261	288	269
Insurance [Member]
Segment Reporting Information [Line Items]
Net interest income	(11)	(11)	(11)
Noninterest income	58,525	53,722	48,616
Noninterest expense	42,084	38,943	36,014
Income Before Income Taxes	16,430	14,768	12,591
Income taxes	4,103	3,673	3,123
Net Income	12,327	11,095	9,468
Selected Financial Information
Total assets	96,649	90,492	87,201
Depreciation and amortization	$ 571	$ 685	$ 768

Parent Company Only Financial_3

Parent Company Only Financial Information - Parent Only Financial Statements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Other assets	$ 764,902	$ 770,838
Total Assets	18,722,189	18,015,478	$ 17,595,636
Liabilities and Shareholders' Equity:
Subordinated notes	123,482	123,262
Junior subordinated debt securities	61,856	61,856
Shareholders' equity	1,661,847	1,492,268	1,741,311	$ 1,741,117
Total Liabilities and Shareholders' Equity	18,722,189	18,015,478
Expense:
Net Income	165,489	71,887	147,365
Operating Activities
Net income	165,489	71,887	147,365
Adjustments to reconcile net income to net cash provided by operating activities:
Other	1,192	(57,359)	(9,601)
Net cash from operating activities	196,887	296,516	348,771
Financing Activities
Common stock dividends	(56,653)	(56,679)	(58,085)
Repurchase and retirement of common stock	0	(24,604)	(61,799)
Net cash from financing activities	455,043	451,844	970,568
Net change in cash and cash equivalents	240,756	(1,532,042)	314,325
Trustmark Corp (Parent Company Only) [Member]
Assets
Investment in banks	1,770,392	1,602,169
Other assets	77,901	76,325
Total Assets	1,848,293	1,678,494
Liabilities and Shareholders' Equity:
Accrued expense	1,108	1,108
Subordinated notes	123,482	123,262
Junior subordinated debt securities	61,856	61,856
Shareholders' equity	1,661,847	1,492,268
Total Liabilities and Shareholders' Equity	1,848,293	1,678,494
Revenue:
Dividends received from banks	67,189	89,733	45,284
Earnings of subsidiaries over distributions	106,388	(11,269)	108,141
Other income	163	94	95
Total Revenue	173,740	78,558	153,520
Expense:
Other expense	8,251	6,671	6,155
Total Expense	8,251	6,671	6,155
Net Income	165,489	71,887	147,365
Operating Activities
Net income	165,489	71,887	147,365
Adjustments to reconcile net income to net cash provided by operating activities:
Net change in investment in subsidiaries	(106,388)	11,269	(108,141)
Other	(797)	(1,550)	(2,078)
Net cash from operating activities	58,304	81,606	37,146
Financing Activities
Common stock dividends	(56,653)	(56,679)	58,085
Repurchase and retirement of common stock	0	(24,604)	(61,799)
Net cash from financing activities	(56,653)	(81,283)	(119,884)
Net change in cash and cash equivalents	1,651	323	(82,738)
Cash and cash equivalents at beginning of year	75,860	75,537	158,275
Cash and cash equivalents at end of year	$ 77,511	$ 75,860	$ 75,537

Parent Company Only Financial_4

Parent Company Only Financial Information - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Financial Statements Captions [Line Items]
Income taxes paid	$ 38,803	$ 2,701	$ 15,259
Trustmark Corp (Parent Company Only) [Member]
Condensed Financial Statements Captions [Line Items]
Income taxes paid	38,800	2,700	15,300
Interest paid	$ 4,500	$ 4,500	$ 4,600