Trustmark (TRMK) 10-Q 7 Nov 23 2023 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2023	Oct. 31, 2023
Cover [Abstract]
Entity Registrant Name	Trustmark Corp
Entity Central Index Key	0000036146
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		61,070,437
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 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 Current Reporting Status	Yes
Entity File Number	000-03683
Entity Incorporation, State or Country Code	MS
Entity Tax Identification Number	64-0471500
Entity Address, Address Line One	248 East Capitol Street
Entity Address, City or Town	Jackson
Entity Address, State or Province	MS
Entity Address, Postal Zip Code	39201
City Area Code	601
Local Phone Number	208-5111
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 750,492	$ 734,787
Federal funds sold and securities purchased under reverse repurchase agreements	0	4,000
securities available for sale, at fair value (amortized cost: $2,028,863 - 2023 $2,270,709 - 2022; allowance for credit losses (ACL): $0)	1,766,174	2,024,082
Securities held to maturity, net of ACL of $0 (fair value: $1,312,871 - 2023; $1,406,589 - 2022)	1,438,287	1,494,514
Loans held for sale (LHFS)	169,244	135,226
Loans held for investment (LHFI)	12,810,259	12,204,039
Less ACL, LHFI	134,031	120,214
Net LHFI	12,676,228	12,083,825
Premises and equipment, net	230,718	212,365
Mortgage servicing rights (MSR)	142,379	129,677
Goodwill	384,237	384,237
Identifiable intangible assets, net	3,093	3,640
Other real estate, net	5,485	1,986
Operating lease right-of-use assets	39,639	36,301
Other assets	784,863	770,838
Total Assets	18,390,839	18,015,478
Deposits:
Noninterest-bearing	3,320,124	4,093,771
Interest-bearing	11,781,799	10,343,877
Total deposits	15,101,923	14,437,648
Federal funds purchased and securities sold under repurchase agreements	321,799	449,331
Other borrowings	793,193	1,050,938
Subordinated notes	123,427	123,262
Junior subordinated debt securities	61,856	61,856
ACL on off-balance sheet credit exposures	34,945	36,838
Operating lease liabilities	42,730	38,932
Other liabilities	340,615	324,405
Total Liabilities	16,820,488	16,523,210
Shareholders' Equity
Authorized: 250,000,000 shares Issued and outstanding: 61,070, 095 shares - 2023; 60,977,686 shares - 2022	12,724	12,705
Capital surplus	158,316	154,645
Retained earnings	1,687,199	1,600,321
Accumulated other comprehensive income (loss), net of tax	(287,888)	(275,403)
Total Shareholders' Equity	1,570,351	1,492,268
Total Liabilities and Shareholders' Equity	$ 18,390,839	$ 18,015,478

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Assets
Securities available-for-sale, amortized cost	$ 2,028,863,000	$ 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	$ 1,312,871,000	$ 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)	61,070,095	60,977,686
Common stock, outstanding (in shares)	61,070,095	60,977,686

Consolidated Statements of Inco

Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest Income
Interest and fees on LHFS & LHFI		$ 203,236	$ 126,441	$ 568,318	$ 316,855
Interest and fees on PPP loans		0	186	0	538
Interest on securities:
Taxable		16,624	16,222	50,164	43,140
Tax exempt		46	79	173	260
Interest on federal funds sold and securities purchased under reverse repurchase agreements		3	2	78	3
Other interest income		8,613	1,493	27,217	4,524
Total Interest Income		228,522	144,423	645,950	365,320
Interest Expense
Interest on deposits		69,797	5,097	165,104	10,631
Interest on federal funds purchased and securities sold under repurchase agreements		5,375	1,225	15,072	1,365
Other interest expense		14,713	1,996	49,638	5,199
Total Interest Expense		89,885	8,318	229,814	17,195
Net Interest Income		138,637	136,105	416,136	348,125
Provision for credit losses (PCL), LHFI		8,322	12,919	19,777	14,775
PCL, off-balance sheet credit exposures		104	(1,326)	(1,893)	(4,000)
Net Interest Income After PCL		130,211	124,512	398,252	337,350
Noninterest Income
Service charges on deposit accounts		11,074	11,318	32,105	30,995
Bank card and other fees		8,217	9,305	24,937	27,914
Mortgage banking, net		6,458	6,876	20,697	24,898
Insurance commissions		15,303	13,911	44,372	41,702
Wealth management		8,773	8,778	26,435	26,934
Other, net		2,399	2,418	8,608	7,531
Total Noninterest Income		52,224	52,606	157,154	159,974
Noninterest Expense
Salaries and employee benefits		76,666	72,707	226,662	213,971
Services and fees	[1]	27,882	26,787	81,572	77,760
Net occupancy - premises		7,383	7,395	22,120	21,366
Equipment expense		6,816	6,072	19,625	18,180
Litigation settlement expense		6,500	0	6,500	0
Other expense	[1]	15,698	13,737	45,011	40,707
Total Noninterest Expense		140,945	126,698	401,490	371,984
Income before income taxes		41,490	50,420	153,916	125,340
Income taxes		7,461	7,965	24,550	19,390
Net Income		$ 34,029	$ 42,455	$ 129,366	$ 105,950
Earnings Per Share
Basic		$ 0.56	$ 0.69	$ 2.12	$ 1.73
Diluted		$ 0.56	$ 0.69	$ 2.11	$ 1.72
[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.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 34,029	$ 42,455	$ 129,366	$ 105,950
Net unrealized gains (losses) on available for sale securities and transferred securities:
Net unrealized holding gains (losses) arising during the period	(20,223)	(85,737)	(11,816)	(235,887)
Change in net unrealized holding loss on securities transferred to held to maturity	3,000	1,350	8,849	(23,588)
Reclassification adjustments for changes realized in net income:
Net change in prior service costs	21	21	62	62
Recognized net loss due to lump sum settlement	0	0	19	0
Change in net actuarial loss	52	221	162	686
Derivatives:
Change in the accumulated gain (loss) on effective cash flow hedge derivatives	(8,504)	(14,643)	(18,427)	(14,643)
Reclassification adjustment for (gain) loss realized in net income	3,470	(482)	8,666	(482)
Other comprehensive income (loss), net of tax	(22,184)	(99,270)	(12,485)	(273,852)
Comprehensive income (loss)	$ 11,845	$ (56,815)	$ 116,881	$ (167,902)

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
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 (Loss)	29,211			29,211
Other comprehensive income (loss), net of tax	(116,096)				(116,096)
Common stock dividends paid ($0.23 per share)	(14,186)			(14,186)
Shares withheld to pay taxes, long-term incentive plan	(1,009)	$ 19	(1,028)
Shares withheld to pay taxes, long-term incentive plan (in shares)		93,944
Repurchase and retirement of common stock	(9,094)	$ (58)	(9,036)
Repurchase and retirement of common stock (in shares)		(279,231)
Compensation expense, long-term incentive plan	1,245		1,245
Balance at Mar. 31, 2022	1,631,382	$ 12,806	167,094	1,600,138	(148,656)
Balance (in shares) at Mar. 31, 2022		61,463,392
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 (Loss)	105,950
Other comprehensive income (loss), net of tax	(273,852)
Balance at Sep. 30, 2022	1,508,945	$ 12,700	154,150	1,648,507	(306,412)
Balance (in shares) at Sep. 30, 2022		60,953,864
Balance at Mar. 31, 2022	1,631,382	$ 12,806	167,094	1,600,138	(148,656)
Balance (in shares) at Mar. 31, 2022		61,463,392
Net Income (Loss)	34,284			34,284
Other comprehensive income (loss), net of tax	(58,486)				(58,486)
Common stock dividends paid ($0.23 per share)	(14,212)			(14,212)
Shares withheld to pay taxes, long-term incentive plan	(7)		(7)
Shares withheld to pay taxes, long-term incentive plan (in shares)		513
Repurchase and retirement of common stock	(7,505)	$ (54)	(7,451)
Repurchase and retirement of common stock (in shares)		(262,782)
Compensation expense, long-term incentive plan	1,240		1,240
Balance at Jun. 30, 2022	1,586,696	$ 12,752	160,876	1,620,210	(207,142)
Balance (in shares) at Jun. 30, 2022		61,201,123
Net Income (Loss)	42,455			42,455
Other comprehensive income (loss), net of tax	(99,270)				(99,270)
Common stock dividends paid ($0.23 per share)	(14,158)			(14,158)
Shares withheld to pay taxes, long-term incentive plan	(2)		(2)
Shares withheld to pay taxes, long-term incentive plan (in shares)		119
Repurchase and retirement of common stock	(8,005)	$ (52)	(7,953)
Repurchase and retirement of common stock (in shares)		(247,378)
Compensation expense, long-term incentive plan	1,229		1,229
Balance at Sep. 30, 2022	1,508,945	$ 12,700	154,150	1,648,507	(306,412)
Balance (in shares) at Sep. 30, 2022		60,953,864
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 (Loss)	$ 50,300			50,300
Other comprehensive income (loss), net of tax	33,022				33,022
Common stock dividends paid ($0.23 per share)	(14,158)			(14,158)
Shares withheld to pay taxes, long-term incentive plan	(1,048)	$ 15	(1,063)
Shares withheld to pay taxes, long-term incentive plan (in shares)		70,830
Compensation expense, long-term incentive plan	1,715		1,715
Balance at Mar. 31, 2023	1,562,099	$ 12,720	155,297	1,636,463	(242,381)
Balance (in shares) at Mar. 31, 2023		61,048,516
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 (Loss)	$ 129,366
Other comprehensive income (loss), net of tax	(12,485)
Balance at Sep. 30, 2023	$ 1,570,351	$ 12,724	158,316	1,687,199	(287,888)
Balance (in shares) at Sep. 30, 2023	61,070,095	61,070,095
Balance at Mar. 31, 2023	$ 1,562,099	$ 12,720	155,297	1,636,463	(242,381)
Balance (in shares) at Mar. 31, 2023		61,048,516
Net Income (Loss)	45,037			45,037
Other comprehensive income (loss), net of tax	(23,323)				(23,323)
Common stock dividends paid ($0.23 per share)	(14,161)			(14,161)
Shares withheld to pay taxes, long-term incentive plan	(22)	$ 4	(26)
Shares withheld to pay taxes, long-term incentive plan (in shares)		20,520
Compensation expense, long-term incentive plan	1,563		1,563
Balance at Jun. 30, 2023	1,571,193	$ 12,724	156,834	1,667,339	(265,704)
Balance (in shares) at Jun. 30, 2023		61,069,036
Net Income (Loss)	34,029			34,029
Other comprehensive income (loss), net of tax	(22,184)				(22,184)
Common stock dividends paid ($0.23 per share)	(14,169)			(14,169)
Shares withheld to pay taxes, long-term incentive plan	(12)		(12)
Shares withheld to pay taxes, long-term incentive plan (in shares)		1,059
Compensation expense, long-term incentive plan	1,494		1,494
Balance at Sep. 30, 2023	$ 1,570,351	$ 12,724	$ 158,316	$ 1,687,199	$ (287,888)
Balance (in shares) at Sep. 30, 2023	61,070,095	61,070,095

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Cash dividends paid on common stock (in dollars per share)	$ 0.23	$ 0.23	$ 0.23	$ 0.23	$ 0.23	$ 0.23

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating Activities
Net Income (Loss)	$ 129,366	$ 105,950
Adjustments to reconcile net income to net cash provided by operating activities:
PCL	17,884	10,775
Depreciation and amortization	26,129	30,354
Net amortization of securities	4,590	9,096
Gains on sales of loans, net	(10,923)	(20,674)
Compensation expense, long-term incentive plan	4,772	3,714
Deferred income tax provision	(470)	12,000
Proceeds from sales of loans held for sale	903,938	1,046,999
Purchases and originations of loans held for sale	(934,136)	(932,601)
Originations of mortgage servicing rights	(11,025)	(14,452)
Earnings on bank-owned life insurance	(3,868)	(3,639)
Net change in other assets	5,043	(21,585)
Net change in other liabilities	9,922	63,048
Other operating activities, net	(8,520)	(60,519)
Net cash from operating activities	132,702	228,466
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity	79,680	98,211
Proceeds from maturities, prepayments and calls of securities available for sale	237,752	358,130
Purchases of securities held to maturity	(11,843)	(600,933)
Purchases of securities available for sale	0	(230,527)
Net proceeds from bank-owned life insurance	(27)	(307)
Net change in federal funds sold and securities purchased under reverse repurchase agreements	4,000	10,098
Net change in member bank stock	(3,358)	5,467
Net change in LHFI and PPP loans	(617,614)	(1,310,309)
Purchases of premises and equipment	(33,105)	(20,656)
Proceeds from sales of premises and equipment	1,828	4,926
Proceeds from sales of other real estate	1,744	2,038
Purchases of software	(7,544)	(5,487)
Investments in tax credit and other partnerships	(11,041)	(20,042)
Net cash from investing activities	(359,528)	(1,739,907)
Financing Activities
Net change in deposits	664,275	(661,980)
Net change in federal funds purchased and securities sold under repurchase agreements	(127,532)	305,491
Net change in short-term borrowings	(250,000)	150,000
Payments on long-term FHLB advances	(15)	(14)
Payments under finance lease obligations	(627)	(1,070)
Common stock dividends	(42,488)	(42,556)
Repurchase and retirement of common stock	0	(24,604)
Shares withheld to pay taxes, long-term incentive plan	(1,082)	(1,018)
Net cash from financing activities	242,531	275,751
Net change in cash and cash equivalents	15,705	1,787,192
Cash and cash equivalents at beginning of period	734,787	2,266,829
Cash and cash equivalents at end of period	$ 750,492	$ 479,637

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 34,029	$ 45,037	$ 50,300	$ 42,455	$ 34,284	$ 29,211	$ 129,366	$ 105,950

Insider Trading Arrangements

Insider Trading Arrangements	9 Months Ended
	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Business, Basis of Financial St

Business, Basis of Financial Statement Presentation and Principles of Consolidation	6 Months Ended
	Jun. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business, Basis of Financial Statement Presentation and Principles of Consolidation	Note 1 – Business, Basis of Financial Statement Presentation and Principles of Consolidation Trustmark Corporation (Trustmark) is a bank holding company headquartered in Jackson, Mississippi. Through its subsidiaries, Trustmark operates as a financial services organization providing banking and financial solutions to corporate institutions and individual customers through offices in Alabama (includes the Georgia Loan Production Office), Florida, Mississippi, Tennessee and Texas. The consolidated financial statements include the accounts of Trustmark and all other entities in which Trustmark has a controlling financial interest. All significant intercompany accounts and transactions have been eliminated in consolidation. Certain reclassifications have been made to prior period amounts to conform to the current period presentation. The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements, and notes thereto, included in Trustmark’s Annual Report on Form 10-K for its fiscal year ended December 31, 2022 (2022 Annual Report). Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period. In the opinion of Management, all adjustments (consisting of normal recurring accruals) considered necessary for the fair presentation of these consolidated financial statements have been included. The preparation of financial statements in conformity with these accounting principles requires Management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and income and expense during the reporting periods and the related disclosures. Although Management’s estimates contemplate current conditions and how they are expected to change in the future, it is reasonably possible that in 2023 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 Available for Sale a

Securities Available for Sale and Held to Maturity	9 Months Ended
	Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]
Securities Available for Sale and Held to Maturity	Note 2 – Securities Available for Sale and Held to Maturity The following tables are a summary of the amortized cost and estimated fair value of securities available for sale and held to maturity at September 30, 2023 and December 31, 2022 ($ in thousands): Securities Available for Sale Securities Held to Maturity September 30, 2023 Amortized Gross Gross Estimated Amortized Gross Gross Estimated U.S. Treasury securities $ 396,070 $ — $ ( 32,594 ) $ 363,476 $ 28,872 $ 1 $ ( 987 ) $ 27,886 U.S. Government agency 7,309 — ( 529 ) 6,780 — — — — Obligations of states and 4,771 — ( 129 ) 4,642 341 — — 341 Mortgage-backed securities Residential mortgage pass- Guaranteed by GNMA 27,009 — ( 4,128 ) 22,881 13,090 — ( 1,083 ) 12,007 Issued by FNMA and 1,386,253 3 ( 214,735 ) 1,171,521 474,003 1 ( 36,482 ) 437,522 Other residential mortgage- Issued or guaranteed by 98,610 — ( 8,208 ) 90,402 162,031 — ( 14,474 ) 147,557 Commercial mortgage-backed Issued or guaranteed by 108,841 — ( 2,369 ) 106,472 759,950 1 ( 72,393 ) 687,558 Total $ 2,028,863 $ 3 $ ( 262,692 ) $ 1,766,174 $ 1,438,287 $ 3 $ ( 125,419 ) $ 1,312,871 Securities Available for Sale Securities Held to Maturity December 31, 2022 Amortized Gross Gross Estimated Amortized Gross Gross Estimated U.S. Treasury Securities $ 425,719 $ 308 $ ( 34,514 ) $ 391,513 $ 28,295 $ — $ ( 115 ) $ 28,180 U.S. Government agency 8,297 — ( 531 ) 7,766 — — — — Obligations of states and 4,820 53 ( 11 ) 4,862 4,510 3 ( 3 ) 4,510 Mortgage-backed securities Residential mortgage pass- Guaranteed by GNMA 30,534 7 ( 3,444 ) 27,097 4,442 — ( 395 ) 4,047 Issued by FNMA and 1,541,570 12 ( 196,119 ) 1,345,463 509,311 — ( 19,586 ) 489,725 Other residential mortgage- Issued or guaranteed by 123,755 — ( 8,615 ) 115,140 188,201 — ( 13,826 ) 174,375 Commercial mortgage-backed Issued or guaranteed by 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. At 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 September 30, 2023 , the net unamortized, unrealized loss on transferred securities included in accumulated other comprehensive income (loss) in the accompanying balance sheet totaled $ 60.4 million compared to $ 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 discounted cash flow (DCF) analysis using the effective interest rate as of the security’s purchase date. The amount of credit loss recorded by Trustmark is limited to the amount by which the amortized cost exceeds the fair value. The DCF analysis utilizes contractual maturities, as well as third-party credit ratings and cumulative default rates published annually by Moody’s Investor Service (Moody’s). At both September 30, 2023 and December 31, 2022 , the results of the analysis 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 September 30, 2023 , accrued interest receivable totaled $ 3.6 million for securities available for sale compared to $ 4.0 million at December 31, 2022 and was reported in other assets on the accompanying consolidated balance sheet. Securities Held to Maturity At September 30, 2023 and December 31, 2022, the potential for credit loss exposure for Trustmark's securities held to maturity was $ 341 thousand and $ 4.5 million, respectively, and consisted of municipal securities. After applying appropriate probability of default (PD) and loss given default (LGD) assumptions, the total amount of current expected credit losses was deemed immaterial. Therefore, no reserve was recorded at September 30, 2023 and December 31, 2022. Accrued interest receivable is excluded from the estimate of credit losses for securities held to maturity. At September 30, 2023 , accrued interest receivable totaled $ 2.6 million for securities held to maturity compared to $ 2.7 million at December 31, 2022 and was reported in other assets on the accompanying consolidated balance sheet. At both September 30, 2023 and December 31, 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 September 30, 2023 and December 31, 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 September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 December 31, 2022 Aaa $ 1,437,946 $ 1,490,004 Aa1 to Aa3 — 3,001 Not Rated (1) 341 1,509 Total $ 1,438,287 $ 1,494,514 (1) Not rated securities primarily consist of Mississippi municipal general obligations. The tables below include securities with gross unrealized losses for which an allowance for credit losses has not been recorded segregated by length of impairment at September 30, 2023 and December 31, 2022 ($ in thousands): Less than 12 Months 12 Months or More Total September 30, 2023 Estimated Gross Estimated Gross Estimated Gross U.S. Treasury securities $ 70,893 $ ( 2,494 ) $ 320,470 $ ( 31,087 ) $ 391,363 $ ( 33,581 ) U.S. Government agency obligations — — 6,742 ( 529 ) 6,742 ( 529 ) Obligations of states and political subdivisions 4,642 ( 129 ) — — 4,642 ( 129 ) Mortgage-backed securities Residential mortgage pass-through Guaranteed by GNMA 9,998 ( 652 ) 24,768 ( 4,559 ) 34,766 ( 5,211 ) Issued by FNMA and FHLMC 300,761 ( 15,670 ) 1,304,006 ( 235,547 ) 1,604,767 ( 251,217 ) Other residential mortgage-backed Issued or guaranteed by FNMA, 8,264 ( 314 ) 229,599 ( 22,368 ) 237,863 ( 22,682 ) Commercial mortgage-backed securities Issued or guaranteed by FNMA, 491,986 ( 44,734 ) 302,044 ( 30,028 ) 794,030 ( 74,762 ) Total $ 886,544 $ ( 63,993 ) $ 2,187,629 $ ( 324,118 ) $ 3,074,173 $ ( 388,111 ) 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 subdivisions 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 securities 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 During the nine months ended September 30, 2023 and 2022 , there were no gross realized gains or losses as a result of calls and dispositions of securities. Realized gains and losses are determined using the specific identification method and are included in noninterest income as securities gains (losses), net. Securities Pledged Securities with a carrying value of $ 2.389 billion and $ 2.693 billion at September 30, 2023 and December 31, 2022, respectively, were pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law. At both September 30, 2023 and December 31, 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 September 30, 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 Amortized Estimated Amortized Estimated Due in one year or less $ 51,084 $ 49,189 $ 341 $ 341 Due after one year through five years 346,269 315,552 28,872 27,886 Due after five years through ten years 6,188 5,794 — — Due after ten years 4,609 4,363 — — 408,150 374,898 29,213 28,227 Mortgage-backed securities 1,620,713 1,391,276 1,409,074 1,284,644 Total $ 2,028,863 $ 1,766,174 $ 1,438,287 $ 1,312,871

LHFI and ACL, LHFI

LHFI and ACL, LHFI	9 Months Ended
	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
LHFI and ACL, LHFI	Note 3 – LHFI and ACL, LHFI At September 30, 2023 and December 31, 2022, LHFI consisted of the following ($ in thousands): September 30, 2023 December 31, 2022 Loans secured by real estate: Construction, land development and other land $ 655,381 $ 690,616 Other secured by 1-4 family residential properties 603,818 590,790 Secured by nonfarm, nonresidential properties 3,569,671 3,278,830 Other real estate secured 1,218,499 742,538 Other loans secured by real estate: Other construction 953,945 1,028,926 Secured by 1-4 family residential properties 2,289,788 2,185,057 Commercial and industrial loans 1,828,924 1,821,259 Consumer loans 165,556 170,230 State and other political subdivision loans 1,056,569 1,223,863 Other commercial loans 468,108 471,930 LHFI 12,810,259 12,204,039 Less ACL 134,031 120,214 Net LHFI $ 12,676,228 $ 12,083,825 Accrued interest receivable is not included in the amortized cost basis of Trustmark’s LHFI. At September 30, 2023 and December 31, 2022 , accrued interest receivable for LHFI totaled $ 64.3 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 September 30, 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. Nonaccrual and Past Due LHFI No material interest income was recognized in the income statement on nonaccrual LHFI for each of the periods ended September 30, 2023 and 2022. 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 September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 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 $ — $ 1,190 $ — Other secured by 1-4 family residential properties 3,801 6,339 727 Secured by nonfarm, nonresidential properties 20,973 24,009 — Other real estate secured — 111 — Other loans secured by real estate: Other construction — 63 — Secured by 1-4 family residential properties — 34,655 2,558 Commercial and industrial loans 88 10,575 39 Consumer loans — 254 480 Other commercial loans — 13,703 — Total $ 24,862 $ 90,899 $ 3,804 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 LHFI) at September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 Past Due 30-59 Days 60-89 Days 90 Days Total Past Due Current Total LHFI Loans secured by real estate: Construction, land development and $ 481 $ 241 $ 508 $ 1,230 $ 654,151 $ 655,381 Other secured by 1-4 family residential 6,527 1,460 2,007 9,994 593,824 603,818 Secured by nonfarm, nonresidential 1,120 57 1,155 2,332 3,567,339 3,569,671 Other real estate secured 224 — 42 266 1,218,233 1,218,499 Other loans secured by real estate: Other construction — — — — 953,945 953,945 Secured by 1-4 family residential properties 17,157 11,471 16,575 45,203 2,244,585 2,289,788 Commercial and industrial loans 5,413 1,156 1,040 7,609 1,821,315 1,828,924 Consumer loans 1,731 688 480 2,899 162,657 165,556 State and other political subdivision loans 110 — — 110 1,056,459 1,056,569 Other commercial loans 1,164 27 — 1,191 466,917 468,108 Total $ 33,927 $ 15,100 $ 21,807 $ 70,834 $ 12,739,425 $ 12,810,259 December 31, 2022 Past Due 30-59 Days 60-89 Days 90 Days More Total Past Due Current Total LHFI Loans secured by real estate: Construction, land development and $ 1,972 $ 199 $ 34 $ 2,205 $ 688,411 $ 690,616 Other secured by 1-4 family residential 3,682 1,206 1,281 6,169 584,621 590,790 Secured by nonfarm, nonresidential 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: Three Months Ended September 30, 2023 Payment Concession Term Extension Total % of Total Class of Loan Loans secured by real estate: Other secured by 1-4 family residential properties $ — $ 96 $ 96 0.02 % Other loans secured by real estate: Secured by 1-4 family residential properties — 346 346 0.02 % Total $ — $ 442 $ 442 0.00 % Nine Months Ended September 30, 2023 Payment Concession Term Extension Total % of Total Class of Loan Loans secured by real estate: Other secured by 1-4 family residential properties $ — $ 494 $ 494 0.08 % Secured by nonfarm, nonresidential properties — 370 370 0.01 % Other loans secured by real estate: Secured by 1-4 family residential properties — 912 912 0.04 % Commercial and industrial loans 255 — 255 0.01 % Consumer loans — 40 40 0.02 % Other commercial loans 116 31 147 0.03 % Total $ 371 $ 1,847 $ 2,218 0.02 % The following tables detail the financial effect of the loan modifications presented above to borrowers experiencing financial difficulty for the periods presented: Three Months Ended September 30, 2023 Financial Effect Payment Concessions Term Extension Loans secured by real estate: Other secured by 1-4 family residential properties Modified lines of credit to amortize over 12 month and 24 month terms Other loans secured by real estate: Secured by 1-4 family residential properties Extended amortization on loans with term adjusted by weighted-average 10.6 years Nine Months Ended September 30, 2023 Financial Effect Payment Concessions Term Extension 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 3.2 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 Six month payment deferral One loan renewed and extended maturity by seven months Trustmark had no unused commitments on modified loans to borrowers experiencing financial difficulty at September 30, 2023. During the nine months ended September 30, 2023 , Trustmark had term extension balances of $ 108 thousand at default for LHFI in the loans secured by 1-4 family residential properties 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): Three Months Ended September 30, 2023 Past Due 30-59 Days 60-89 Days 90 Days Total Past Due Current Total Loans secured by real estate: Other secured by 1-4 family residential $ — $ — $ — $ — $ 96 $ 96 Other loans secured by real estate: Secured by 1-4 family residential properties — — — — 346 346 Total $ — $ — $ — $ — $ 442 $ 442 Nine Months Ended September 30, 2023 Past Due 30-59 Days 60-89 Days 90 Days Total Past Due Current Total Loans secured by real estate: Other secured by 1-4 family residential $ 272 $ — $ — $ 272 $ 222 $ 494 Secured by nonfarm, nonresidential — — — — 370 370 Other loans secured by real estate: Secured by 1-4 family residential properties 170 — — 170 742 912 Commercial and industrial loans — — — — 255 255 Consumer loans 20 — — 20 20 40 Other commercial loans — — — — 147 147 Total $ 462 $ — $ — $ 462 $ 1,756 $ 2,218 Collateral-Dependent Loans The following tables present the amortized cost basis of collateral-dependent loans by class of loans and collateral type as of September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 Real Estate Inventory and Receivables Vehicles Miscellaneous Total Loans secured by real estate: Other secured by 1-4 family $ 980 $ — $ — $ — $ 980 Secured by nonfarm, nonresidential 20,973 — — — 20,973 Other loans secured by real estate: Secured by 1-4 family residential 2,822 — — — 2,822 Commercial and industrial loans 38 355 367 8,472 9,232 Other commercial loans — — — 13,371 13,371 Total $ 24,813 $ 355 $ 367 $ 21,843 $ 47,378 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. One credit relationship experienced a decline in fair value due to general deterioration during the quarter to the collateral that secures the relationship. There have been no other significant changes to the collateral that secures these financial assets during the period. • State and other political subdivision loans – Loans within this loan class are secured by liens on real estate properties 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. One loan relationship experienced a decline in fair value due to general deterioration during the quarter to the assets that secure the relationship. There have been no other significant changes to the collateral that secures these financial assets during the period. Credit Quality Indicators Trustmark’s LHFI portfolio credit quality indicators focus on six key quality ratios that are compared against bank tolerances. The loan indicators are total classified outstanding, total criticized outstanding, nonperforming loans, nonperforming assets, delinquencies and net loan losses. Due to the homogeneous 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 an 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 the bank regulatory agencies and are generally equally applied to each individual lending institution. The remaining credit risk grades are considered pass credits and are solely defined by Trustmark. To enhance this process, Trustmark has determined that 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 the 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, accru al 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 $100 thousand or more. In addition, periodic reviews of significant development, commercial construction, multi-family and nonowner-occupied projects are performed. These reviews assess each particular project with respect to location, project valuations, progress of completion, leasing status, current financial information, rents, operating expenses, cash flow, adherence to budget and projections and other information as applicable. Summary results are reviewed by Senior and Regional Credit Officers in addition to the Chief Credit Officer with a determination made as to the appropriateness of existing risk ratings and accrual status. Consumer Credits Consumer LHFI that do not meet a minimum custom credit score are reviewed quarterly. The Retail Credit Review Committee, Management Credit Policy Committee and the Enterprise Risk Committee review the volume and/or percentage of approvals that did not meet the minimum passing custom score to ensure that Trustmark continues to originate quality loans. Trustmark monitors the levels and severity of past due consumer LHFI on a daily basis through its collection activities. A detailed assessment of consumer LHFI delinquencies is performed monthly at both a product and market level. The tables below present the amortized cost basis of loans by credit quality indicator and class of loans based on analyses performed at September 30, 2023 and December 31, 2022 ($ in thousands): Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of September 30, 2023 Commercial LHFI Loans secured by real estate: Construction, land Pass - RR 1 through RR 6 $ 293,087 $ 138,233 $ 51,342 $ 16,250 $ 2,219 $ 2,166 $ 58,294 $ 561,591 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 338 592 — 20 — 23 — 973 Doubtful - RR 9 — — — — — 42 — 42 Total 293,425 138,825 51,342 16,270 2,219 2,231 58,294 562,606 Current period gross — 4 10 — 228 — — 242 Other secured by 1-4 family Pass - RR 1 through RR 6 $ 28,114 $ 32,346 $ 27,894 $ 14,821 $ 8,273 $ 4,298 $ 9,176 $ 124,922 Special Mention - RR 7 — 28 53 12 — — — 93 Substandard - RR 8 704 681 29 61 82 238 99 1,894 Doubtful - RR 9 — 9 — — — — — 9 Total 28,818 33,064 27,976 14,894 8,355 4,536 9,275 126,918 Current period gross — — 23 — — — — 23 Secured by nonfarm, Pass - RR 1 through RR 6 $ 441,919 $ 880,761 $ 599,643 $ 626,109 $ 387,867 $ 387,001 $ 129,632 $ 3,452,932 Special Mention - RR 7 13,235 14,930 25,000 1,147 — — — 54,312 Substandard - RR 8 10,123 1,712 21,914 10,112 8,661 9,748 50 62,320 Doubtful - RR 9 24 — — — 60 14 — 98 Total 465,301 897,403 646,557 637,368 396,588 396,763 129,682 3,569,662 Current period gross — 39 82 — 19 138 — 278 Other real estate secured: Pass - RR 1 through RR 6 $ 102,678 $ 353,814 $ 361,897 $ 268,866 $ 56,340 $ 11,711 $ 11,631 $ 1,166,937 Special Mention - RR 7 126 14,867 — — 35,911 — — 50,904 Substandard - RR 8 — 131 — 294 — 47 — 472 Doubtful - RR 9 42 — — — — — — 42 Total 102,846 368,812 361,897 269,160 92,251 11,758 11,631 1,218,355 Current period gross — — — — — — — — Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of September 30, 2023 Commercial LHFI Other loans secured by real Other construction: Pass - RR 1 through RR 6 $ 175,054 $ 529,544 $ 180,594 $ 68,641 $ — $ — $ 49 $ 953,882 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 63 — — — — — — 63 Doubtful - RR 9 — — — — — — — — Total 175,117 529,544 180,594 68,641 — — 49 953,945 Current period gross 61 3,392 — — — — — 3,453 Commercial and industrial Pass - RR 1 through RR 6 $ 410,007 $ 529,180 $ 181,582 $ 74,467 $ 34,800 $ 46,348 $ 489,700 $ 1,766,084 Special Mention - RR 7 — 7,048 128 7 — — 1,963 9,146 Substandard - RR 8 5,842 4,862 8,265 12,055 154 88 22,238 53,504 Doubtful - RR 9 3 84 38 — — 63 2 190 Total 415,852 541,174 190,013 86,529 34,954 46,499 513,903 1,828,924 Current period gross 28 536 651 138 94 108 7 1,562 State and other political Pass - RR 1 through RR 6 $ 74,824 $ 261,922 $ 182,951 $ 106,513 $ 34,148 $ 390,838 $ 5,373 $ 1,056,569 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 — — — — — — — — Doubtful - RR 9 — — — — — — — — Total 74,824 261,922 182,951 106,513 34,148 390,838 5,373 1,056,569 Current period gross — — — — — — — — Other commercial loans: Pass - RR 1 through RR 6 $ 142,805 $ 35,989 $ 28,920 $ 22,720 $ 33,492 $ 9,638 $ 179,719 $ 453,283 Special Mention - RR 7 — — — — — — 20 20 Substandard - RR 8 106 3,401 48 — — 1,050 10,108 14,713 Doubtful - RR 9 92 — — — — — — 92 Total 143,003 39,390 28,968 22,720 33,492 10,688 189,847 468,108 Current period gross — 6 — 26 — — — 32 Total commercial $ 1,699,186 $ 2,810,134 $ 1,670,298 $ 1,222,095 $ 602,007 $ 863,313 $ 918,054 $ 9,785,087 Total commercial LHFI $ 89 $ 3,977 $ 766 $ 164 $ 341 $ 246 $ 7 $ 5,590 Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of September 30, 2023 Consumer LHFI Loans secured by real estate: Construction, land Current $ 37,611 $ 42,200 $ 7,116 $ 1,754 $ 1,176 $ 2,185 $ 166 $ 92,208 Past due 30-89 days — 313 — — 33 17 — 363 Past due 90 days or more — — — — — — — — Nonaccrual — — 200 — — 4 — 204 Total 37,611 42,513 7,316 1,754 1,209 2,206 166 92,775 Current period gross — — — — — — — — Other secured by 1-4 family Current $ 20,453 $ 13,762 $ 5,905 $ 4,603 $ 4,438 $ 8,965 $ 406,021 $ 464,147 Past due 30-89 days 6 41 58 10 44 522 5,880 6,561 Past due 90 days or more — 6 — — — 67 654 727 Nonaccrual 59 128 60 10 435 482 4,291 5,465 Total 20,518 13,937 6,023 4,623 4,917 10,036 416,846 476,900 Current period gross — 94 5 — 10 17 81 207 Secured by nonfarm, Current $ — $ — $ 9 $ — $ — $ — $ — $ 9 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — — 9 — — — — 9 Current period gross — — — — — — — — Other real estate secured: Current $ — $ — $ — $ 81 $ — $ 63 $ — $ 144 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — — — 81 — 63 — 144 Current period gross — — — — — — — — Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of September 30, 2023 Consumer LHFI Other loans secured by real Secured by 1-4 family Current $ 242,667 $ 886,235 $ 529,310 $ 183,816 $ 101,283 $ 284,715 $ — $ 2,228,026 Past due 30-89 days 1,458 12,375 6,151 2,270 297 1,996 — 24,547 Past due 90 days or more 246 1,169 938 139 — 65 — 2,557 Nonaccrual 158 9,876 9,480 4,398 2,196 8,550 — 34,658 Total 244,529 909,655 545,879 190,623 103,776 295,326 — 2,289,788 Current period gross 1 562 156 92 — 92 — 903 Consumer loans: Current $ 50,059 $ 39,900 $ 13,199 $ 3,511 $ 1,217 $ 471 $ 54,101 $ 162,458 Past due 30-89 days 683 394 156 1 13 8 1,109 2,364 Past due 90 days or more 29 39 1 2 — — 409 480 Nonaccrual — 113 90 16 — — 35 254 Total 50,771 40,446 13,446 3,530 1,230 479 55,654 165,556 Current period gross 4,389 434 146 41 1 1 1,553 6,565 Total consumer LHFI $ 353,429 $ 1,006,551 $ 572,673 $ 200,611 $ 111,132 $ 308,110 $ 472,666 $ 3,025,172 Total consumer LHFI $ 4,390 $ 1,090 $ 307 $ 133 $ 11 $ 110 $ 1,634 $ 7,675 Total LHFI $ 2,052,615 $ 3,816,685 $ 2,242,971 $ 1,422,706 $ 713,139 $ 1,171,423 $ 1,390,720 $ 12,810,259 Total current period $ 4,479 $ 5,067 $ 1,073 $ 297 $ 352 $ 356 $ 1,641 $ 13,265 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 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 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, 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 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 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 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 $ 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 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 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, 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 Other loans secured by real Secured by 1-4 family 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

Mortgage Banking

Mortgage Banking	9 Months Ended
	Sep. 30, 2023
Mortgage Banking [Abstract]
Mortgage Banking	Note 4 – Mortgage Banking MSR The activity in the MSR is detailed in the table below for the periods presented ($ in thousands): Nine Months Ended September 30, 2023 2022 Balance at beginning of period $ 129,677 $ 87,687 Origination of servicing assets 11,025 14,452 Change in fair value: Due to market changes 8,735 41,529 Due to run-off ( 7,058 ) ( 11,053 ) Balance at end of period $ 142,379 $ 132,615 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 September 30, 2023 , the fair value of the MSR included an assumed average prepayment speed of 8 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 9.58 % at September 30, 2022. Mortgage Loans Serviced/Sold During the first nine months of 2023 and 2022 , Trustmark sold $ 893.0 million and $ 1.026 billion, respectively, of residential mortgage loans. Gains on these sales were recorded as noninterest income in mortgage banking, net and totaled $ 11.4 million for the first nine months of 2023 compared to $ 16.9 million for the first nine months of 2022. The table below details the mortgage loans sold and serviced for others at September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 December 31, 2022 Federal National Mortgage Association $ 4,802,861 $ 4,684,815 Government National Mortgage Association 3,478,965 3,350,222 Federal Home Loan Mortgage Corporation 90,119 52,023 Other 31,440 28,764 Total mortgage loans sold and serviced for others $ 8,403,385 $ 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 certain instances in which FNMA and FHLMC will not exercise their remedies, including a putback request, for breaches of certain selling representations and warranties, such as payment history and quality control review. When a putback request is received, Trustmark evaluates the request and takes appropriate actions based on the nature of the request. Trustmark is required by FNMA and FHLMC to provide a response to putback requests within 60 days of the date of receipt. The total mortgage loan servicing putback expenses are included in other expense. At both September 30, 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.

Other Real Estate

Other Real Estate	9 Months Ended
	Sep. 30, 2023
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Other Real Estate	Note 5 – Other Real Estate At September 30, 2023, Trustmark’s geographic other real estate distribution was primarily concentrated in its Texas and Mississippi 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): Nine Months Ended September 30, 2023 2022 Balance at beginning of period $ 1,986 $ 4,557 Additions 5,434 1,430 Disposals ( 1,903 ) ( 2,503 ) (Write-downs) recoveries ( 32 ) ( 513 ) Balance at end of period $ 5,485 $ 2,971 Gains (losses), net on the sale of other real estate included in $ ( 159 ) $ ( 465 ) At September 30, 2023 and December 31, 2022, other real estate by type of property consisted of the following ($ in thousands): September 30, 2023 December 31, 2022 1-4 family residential properties $ 902 $ 1,128 Nonfarm, nonresidential properties 4,528 561 Other real estate properties 55 297 Total other real estate $ 5,485 $ 1,986 At September 30, 2023 and December 31, 2022, other real estate by geographic location consisted of the following ($ in thousands): September 30, 2023 December 31, 2022 Alabama $ 315 $ 194 Mississippi (1) 942 1,769 Tennessee (2) — 23 Texas 4,228 — Total other real estate $ 5,485 $ 1,986 (1) Mississippi includes Central and Southern Mississippi Regions. (2) Tennessee includes Memphis, Tennessee and Northern Mississippi Regions. At September 30, 2023 , the balance of other real estate included $ 902 thousand of foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property compared to $ 1.1 million at December 31, 2022. At September 30, 2023 and December 31, 2022, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process was $ 6.0 million and $ 2.9 million, respectively.

Leases

Leases	9 Months Ended
	Sep. 30, 2023
Leases [Abstract]
Leases	Note 6 – Leases The following table details the components of net lease cost for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Finance leases: Amortization of right-of-use assets $ 113 $ 356 $ 673 $ 1,122 Interest on lease liabilities 41 46 124 143 Operating lease cost 1,372 1,309 3,976 3,877 Short-term lease cost 62 98 218 328 Variable lease cost 208 257 690 891 Sublease income ( 3 ) ( 4 ) ( 9 ) ( 166 ) Net lease cost $ 1,793 $ 2,062 $ 5,672 $ 6,195 The following table details the cash payments included in the measurement of lease liabilities during the periods presented ($ in thousands): Nine Months Ended September 30, 2023 2022 Finance leases: Operating cash flows included in operating activities $ 124 $ 143 Financing cash flows included in payments under finance lease obligations 627 1,070 Operating leases: Operating cash flows (fixed payments) included in other operating activities, net 3,430 4,389 Operating cash flows (liability reduction) included in other operating activities, net 2,771 3,075 The following table details balance sheet information, as well as weighted-average lease terms and discount rates, related to leases at September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 December 31, 2022 Finance lease right-of-use assets, net of accumulated depreciation $ 3,864 $ 4,537 Finance lease liabilities 4,427 5,055 Operating lease right-of-use assets 39,639 36,301 Operating lease liabilities 42,730 38,932 Weighted-average lease term: Finance leases 8.60 years 8.72 years Operating leases 10.15 years 9.64 years Weighted-average discount rate: Finance leases 3.61 % 3.49 % Operating leases 3.63 % 3.22 % At September 30, 2023, future minimum rental commitments under finance and operating leases were as follows ($ in thousands): Finance Leases Operating Leases 2023 (excluding the nine months ended September 30, 2023) $ 133 $ 843 2024 572 5,394 2025 584 5,425 2026 589 5,176 2027 594 4,971 Thereafter 2,685 30,194 Total minimum lease payments 5,157 52,003 Less imputed interest ( 730 ) ( 9,273 ) Lease liabilities $ 4,427 $ 42,730

Deposits

Deposits	9 Months Ended
	Sep. 30, 2023
Deposits [Abstract]
Deposits	Note 7 – Deposits At September 30, 2023 and December 31, 2022, deposits consisted of the following ($ in thousands): September 30, 2023 December 31, 2022 Noninterest-bearing demand $ 3,320,124 $ 4,093,771 Interest-bearing demand 4,835,577 4,773,219 Savings 3,547,547 4,282,435 Time 3,398,675 1,288,223 Total $ 15,101,923 $ 14,437,648

Securities Sold Under Repurchas

Securities Sold Under Repurchase Agreements	9 Months Ended
	Sep. 30, 2023
Securities Sold under Agreements to Repurchase [Abstract]
Securities Sold Under Repurchase Agreements	Note 8 – Securities Sold Under Repurchase Agreements Trustmark utilizes securities sold under repurchase agreements as a source of borrowing in connection with overnight repurchase agreements offered to commercial deposit customers by using its unencumbered investment securities as collateral. Trustmark accounts for its securities sold under repurchase agreements as secured borrowings in accordance with FASB ASC Subtopic 860-30, “Transfers and Servicing – Secured Borrowing and Collateral.” Securities sold under repurchase agreements are stated at the amount of cash received in connection with the transaction. Trustmark monitors collateral levels on a continual basis and may be required to provide additional collateral based on the fair value of the underlying securities. Securities sold under repurchase agreements were secured by securities with a carrying amount of $ 61.0 million and $ 102.4 million at September 30, 2023 and December 31, 2022, respectively. Trustmark’s repurchase agreements are transacted under master repurchase agreements that give Trustmark, in the event of default by the counterparty, the right of offset with the same counterparty. At both September 30, 2023 and December 31, 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 September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 December 31, 2022 Mortgage-backed securities Residential mortgage pass-through securities Issued by FNMA and FHLMC $ 42,108 $ 41,732 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 1,294 1,111 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA — 21,277 Total securities sold under repurchase agreements $ 43,402 $ 64,120

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Note 9 – Revenue from Contracts with Customers Trustmark accounts for revenue from contracts with customers in accordance with FASB ASC Topic 606, “Revenue from Contracts with Customers,” which provides that revenue be recognized in a manner that depicts the transfer of goods or services to a customer in an amount that reflects the consideration Trustmark expects to be entitled to in exchange for those goods or services. Revenue from contracts with customers is recognized either over time in a manner that depicts Trustmark’s performance, or at a point in time when control of the goods or services are transferred to the customer. Trustmark’s noninterest income, excluding all of mortgage banking, net and securities gains (losses), net and portions of bank card and other fees and other income, are considered within the scope of FASB ASC Topic 606. Gains or losses on the sale of other real estate, which are included in Trustmark’s noninterest expense as other real estate expense, are also within the scope of FASB ASC Topic 606. Trustmark records a gain or loss from the sale of other real estate when control of the property transfers to the buyer. Trustmark records the gain or loss from the sale of other real estate in noninterest expense as other, net. Other real estate sales for the three months ended September 30, 2023 result in a net loss of $ 47 thousand compared to a net loss of $ 11 thousand for the three months ended September 30, 2022. Other real estate sales for the nine months ended September 30, 2023 resulted in a net loss of $ 159 thousand compared to a net loss of $ 465 thousand for the nine months ended September 30, 2022. The following tables present noninterest income disaggregated by reportable operating segment and revenue stream for the periods presented ($ in thousands): Three Months Ended September 30, 2023 Three Months Ended September 30, 2022 Topic 606 Not Topic (1) Total Topic 606 Not Topic (1) Total General Banking Segment Service charges on deposit accounts $ 11,052 $ — $ 11,052 $ 11,296 $ — $ 11,296 Bank card and other fees 7,332 873 8,205 7,644 1,648 9,292 Mortgage banking, net — 6,458 6,458 — 6,876 6,876 Wealth management 202 — 202 263 — 263 Other, net 2,843 ( 579 ) 2,264 1,724 239 1,963 Total noninterest income $ 21,429 $ 6,752 $ 28,181 $ 20,927 $ 8,763 $ 29,690 Wealth Management Segment Service charges on deposit accounts $ 22 $ — $ 22 $ 22 $ — $ 22 Bank card and other fees 12 — 12 13 — 13 Wealth management 8,571 — 8,571 8,515 — 8,515 Other, net 41 94 135 447 10 457 Total noninterest income $ 8,646 $ 94 $ 8,740 $ 8,997 $ 10 $ 9,007 Insurance Segment Insurance commissions $ 15,303 $ — $ 15,303 $ 13,911 $ — $ 13,911 Other, net — — — ( 2 ) — ( 2 ) Total noninterest income $ 15,303 $ — $ 15,303 $ 13,909 $ — $ 13,909 Consolidated Service charges on deposit accounts $ 11,074 $ — $ 11,074 $ 11,318 $ — $ 11,318 Bank card and other fees 7,344 873 8,217 7,657 1,648 9,305 Mortgage banking, net — 6,458 6,458 — 6,876 6,876 Insurance commissions 15,303 — 15,303 13,911 — 13,911 Wealth management 8,773 — 8,773 8,778 — 8,778 Other, net 2,884 ( 485 ) 2,399 2,169 249 2,418 Total noninterest income $ 45,378 $ 6,846 $ 52,224 $ 43,833 $ 8,773 $ 52,606 (1) Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, accretion of the FDIC indemnification asset, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and security gains (losses), net. Nine Months Ended September 30, 2023 Nine Months Ended September 30, 2022 Topic 606 Not Topic (1) Total Topic 606 Not Topic (1) Total General Banking Segment Service charges on deposit accounts $ 32,040 $ — $ 32,040 $ 30,932 $ — $ 30,932 Bank card and other fees 23,011 1,890 24,901 23,726 4,153 27,879 Mortgage banking, net — 20,697 20,697 — 24,898 24,898 Wealth management 650 — 650 468 — 468 Other, net 8,763 ( 1,516 ) 7,247 6,097 896 6,993 Total noninterest income $ 64,464 $ 21,071 $ 85,535 $ 61,223 $ 29,947 $ 91,170 Wealth Management Segment Service charges on deposit accounts $ 65 $ — $ 65 $ 63 $ — $ 63 Bank card and other fees 36 — 36 35 — 35 Wealth management 25,785 — 25,785 26,466 — 26,466 Other, net 122 285 407 512 29 541 Total noninterest income $ 26,008 $ 285 $ 26,293 $ 27,076 $ 29 $ 27,105 Insurance Segment Insurance commissions $ 44,372 $ — $ 44,372 $ 41,702 $ — $ 41,702 Other, net 954 — 954 ( 3 ) — ( 3 ) Total noninterest income $ 45,326 $ — $ 45,326 $ 41,699 $ — $ 41,699 Consolidated Service charges on deposit accounts $ 32,105 $ — $ 32,105 $ 30,995 $ — $ 30,995 Bank card and other fees 23,047 1,890 24,937 23,761 4,153 27,914 Mortgage banking, net — 20,697 20,697 — 24,898 24,898 Insurance commissions 44,372 — 44,372 41,702 — 41,702 Wealth management 26,435 — 26,435 26,934 — 26,934 Other, net 9,839 ( 1,231 ) 8,608 6,606 925 7,531 Total noninterest income $ 135,798 $ 21,356 $ 157,154 $ 129,998 $ 29,976 $ 159,974 (1) Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, accretion of the FDIC indemnification asset, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and security gains (losses), net.

Defined Benefit and Other Postr

Defined Benefit and Other Postretirement Benefits	9 Months Ended
	Sep. 30, 2023
Retirement Benefits [Abstract]
Defined Benefit and Other Postretirement Benefits	Note 10 – Defined Benefit and Other Postretirement Benefits Qualified Pension Plan Trustmark maintains a noncontributory tax-qualified defined benefit pension plan titled the Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions (the Continuing Plan) to satisfy commitments made by Trustmark to associates covered through plans obtained in acquisitions. The following table presents information regarding the net periodic benefit cost for the Continuing Plan for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Service cost $ 13 $ 28 $ 39 $ 86 Interest cost 73 48 219 144 Expected return on plan assets ( 27 ) ( 30 ) ( 80 ) ( 90 ) Recognized net loss due to lump sum settlements — — 25 — Recognized net actuarial loss — 52 — 172 Net periodic benefit cost $ 59 $ 98 $ 203 $ 312 For the plan year ending December 31, 2023, Trustmark’s minimum required contribution to the Continuing Plan is $ 159 thousand; however, Management and the Board of Directors of Trustmark will monitor the Continuing Plan throughout 2023 to determine any additional funding requirements by the plan’s measurement date, which is December 31. Supplemental Retirement Plans Trustmark maintains a nonqualified supplemental retirement plan covering key executive officers and senior officers as well as directors who have elected to defer fees. The plan provides for retirement and/or death benefits based on a participant’s covered salary or deferred fees. Although plan benefits may be paid from Trustmark’s general assets, Trustmark has purchased life insurance contracts on the participants covered under the plan, which may be used to fund future benefit payments under the plan. The annual measurement date for the plan is December 31. As a result of mergers prior to 2014, Trustmark became the administrator of nonqualified supplemental retirement plans, for which the plan benefits were frozen prior to the merger date. The following table presents information regarding the net periodic benefit cost for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Service cost $ 17 $ 18 $ 51 $ 54 Interest cost 497 316 1,515 962 Amortization of prior service cost 28 28 83 83 Recognized net actuarial loss 70 243 216 742 Net periodic benefit cost $ 612 $ 605 $ 1,865 $ 1,841

Stock and Incentive Compensatio

Stock and Incentive Compensation	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stock and Incentive Compensation	Note 11 – Stock and Incentive Compensation 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. 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 units at the grant date. The Monte Carlo simulation was 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. 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 tables summarize the Stock Plan activity for the periods presented: Three Months Ended September 30, 2023 Performance Time-Vested Nonvested units, beginning of period 174,214 364,198 Granted — — Released from restriction — ( 1,500 ) Forfeited — ( 688 ) Nonvested units, end of period 174,214 362,010 Nine Months Ended September 30, 2023 Performance Time-Vested Nonvested units, beginning of period 148,416 312,978 Granted 70,666 145,003 Released from restriction ( 39,943 ) ( 89,041 ) Forfeited ( 4,925 ) ( 6,930 ) Nonvested units, end of period 174,214 362,010 The following table presents information regarding compensation expense for units under the Stock Plan for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Performance units $ 449 $ 381 $ 1,181 $ 916 Time-vested units 1,045 848 3,591 2,798 Total compensation expense $ 1,494 $ 1,229 $ 4,772 $ 3,714

Contingencies

Contingencies	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Note 12 – Contingencies Lending Related Trustmark makes commitments to extend credit and issues standby and commercial letters of credit (letters of credit) in the normal course of business in order to fulfill the financing needs of its customers. The carrying amount of commitments to extend credit and letters of credit approximates the fair value of such financial instruments. Commitments to extend credit are agreements to lend money to customers pursuant to certain specified conditions. Commitments generally have fixed expiration dates or other termination clauses. Because many of these commitments are expected to expire without being fully drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The exposure to credit loss in the event of nonperformance by the other party to the commitments to extend credit is represented by the contract amount of those instruments. Trustmark applies the same credit policies and standards as it does in the lending process when making these commitments. The collateral obtained is based upon the nature of the transaction and the assessed creditworthiness of the borrower. At September 30, 2023 and 2022 , Trustmark had unused commitments to extend credit of $ 5.030 billion and $ 5.171 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 September 30, 2023 and 2022, Trustmark’s maximum exposure to credit loss in the event of nonperformance by the customer for letters of credit was $ 127.8 million and $ 140.6 million, respectively. These amounts consist primarily of commitments with maturities of less than three years , which have an immaterial carrying value. Trustmark holds collateral to support standby letters of credit when deemed necessary. As of September 30, 2023 and 2022 , the fair value of collateral held was $ 32.0 million and $ 32.6 million, respectively. ACL on Off-Balance Sheet Credit Exposures Trustmark maintains a separate ACL on off-balance sheet credit exposures, including unfunded loan commitments and letters of credit, which is included on the accompanying consolidated balance sheet as of September 30, 2023 and December 31, 2022. Changes in the ACL on off-balance sheet credit exposures were as follows for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Balance at beginning of period $ 34,841 $ 32,949 $ 36,838 $ 35,623 PCL, off-balance sheet credit exposures 104 ( 1,326 ) ( 1,893 ) ( 4,000 ) Balance at end of period $ 34,945 $ 31,623 $ 34,945 $ 31,623 Adjustments to the ACL on off-balance sheet credit exposures are recorded to PCL, off-balance sheet credit exposures. The increase in the ACL on off-balance sheet credit exposures for the three months ended September 30, 2023 was primarily due to the weakening macroeconomic forecasts as well as the net adjustment to the qualitative factors. The decrease in the ACL on off-balance sheet credit exposures for the nine months ended September 30, 2023 was primarily due to decreases in unfunded balances for the construction, land development and other land portfolio and other construction loan portfolio. The decrease in the ACL on off-balance sheet credit exposures for the three and nine months ended September 30, 2022 was primarily due to a decrease in the unfunded balances. No credit loss estimate is reported for off-balance sheet credit exposures that are unconditionally cancellable by Trustmark or for undrawn amounts under such arrangements that may be drawn prior to the cancellation of the arrangement. Legal Proceedings Trustmark’s wholly-owned subsidiary, TNB, has been named as a defendant in several lawsuits related to the collapse of the Stanford Financial Group. On August 23, 2009, a purported class action complaint was filed in the District Court of Harris County, Texas, by Peggy Roif Rotstain, Guthrie Abbott, Catherine Burnell, Steven Queyrouze, Jaime Alexis Arroyo Bornstein and Juan C. Olano (collectively, Class Plaintiffs), on behalf of themselves and all others similarly situated, naming TNB and four other financial institutions and one individual, each of which are unaffiliated with Trustmark, as defendants (the Rotstain Action). The complaint sought to recover (i) alleged fraudulent transfers from each of the defendants in the amount of fees and other monies received by each defendant from entities controlled by R. Allen Stanford (collectively, the Stanford Financial Group) and (ii) damages allegedly attributable to alleged conspiracies by one or more of the defendants with the Stanford Financial Group to commit fraud and/or aid and abet fraud on the asserted grounds that defendants knew or should have known the Stanford Financial Group was conducting an illegal and fraudulent scheme. In November 2009, the lawsuit was removed to federal court by certain defendants and then transferred by the United States Panel on Multidistrict Litigation to the United States District Court for the Northern District of Texas (Dallas), where multiple Stanford related matters have been consolidated for pre-trial proceedings. In May 2010, all defendants (including TNB) filed motions to dismiss the lawsuit. In August 2010, the court authorized and approved the formation of an Official Stanford Investors Committee (OSIC) to represent the interests of Stanford investors and, under certain circumstances, to file legal actions for the benefit of Stanford investors. In December 2011, the OSIC filed a motion to intervene in this action, which was granted in December 2012. The OSIC initially sought to recover from TNB and the other defendant financial institutions: (i) alleged fraudulent transfers in the amount of the fees each of the defendants allegedly received from Stanford Financial Group, the profits each of the defendants allegedly made from Stanford Financial Group deposits, and other monies each of the defendants allegedly received from Stanford Financial Group; (ii) damages attributable to alleged conspiracies by each of the defendants with the Stanford Financial Group to commit fraud and/or aid and abet fraud and conversion on the asserted grounds that the defendants knew or should have known the Stanford Financial Group was conducting an illegal and fraudulent scheme; and (iii) punitive damages. In July 2013, all defendants (including TNB) filed motions to dismiss the OSIC’s claims. In March 2015, the court entered an order authorizing the parties to conduct discovery regarding class certification, staying all other discovery and setting a deadline for the parties to complete briefing on class certification issues. In April 2015, the court granted in part and denied in part the defendants’ motions to dismiss the Class Plaintiffs’ claims and the OSIC’s claims. The court dismissed all of the Class Plaintiffs’ fraudulent transfer claims and dismissed certain of the OSIC’s claims. The court denied the motions by TNB and the other financial institution defendants to dismiss the OSIC’s constructive fraudulent transfer claims. On June 23, 2015, the court allowed the Class Plaintiffs to file a Second Amended Class Action Complaint (SAC), which asserted new claims against TNB and certain of the other defendants for (i) aiding, abetting and participating in a fraudulent scheme, (ii) aiding, abetting and participating in violations of the Texas Securities Act, (iii) aiding, abetting and participating in breaches of fiduciary duty, (iv) aiding, abetting and participating in conversion and (v) conspiracy. On July 14, 2015, the defendants (including TNB) filed motions to dismiss the SAC and to reconsider the court’s prior denial to dismiss the OSIC’s constructive fraudulent transfer claims against TNB and the other financial institutions that are defendants in the action. On July 27, 2016, the court denied the motion by TNB and the other financial institution defendants to dismiss the SAC and also denied the motion by TNB and the other financial institution defendants to reconsider the court’s prior refusal to dismiss the OSIC’s constructive fraudulent transfer claims. On August 24, 2016, TNB filed its answer to the SAC. On October 20, 2017, the OSIC filed a motion seeking an order lifting the discovery stay and establishing a trial schedule. On November 4, 2016, the OSIC filed a First Amended Intervenor Complaint, which added claims for (i) aiding, abetting or participation in violations of the Texas Securities Act and (ii) aiding, abetting or participation in the breach of fiduciary duty. On November 7, 2017, the court denied the Class Plaintiffs’ motion seeking class certification and designation of class representatives and counsel, finding that common issues of fact did not predominate. The court granted the OSIC’s motion to lift the discovery stay that it had previously ordered. On May 3, 2019, individual investors and entities filed motions to intervene in the action. On September 18, 2019, the court denied the motions to intervene. On October 14, 2019, certain of the proposed intervenors filed a notice of appeal. On February 3, 2021, the Fifth Circuit Court of Appeals affirmed the denial of the motions to intervene; this decision was affirmed by a panel of the Fifth Circuit on March 12, 2021. On February 12, 2021, all defendants (including TNB) filed a motion for summary judgment with respect to OSIC claims that applied to all defendants. In addition, on the same date, TNB filed a separate motion for summary judgment with respect to aspects of OSIC claims that applied specifically to TNB. On March 19, 2021, OSIC filed notice with the court that it was abandoning as against all of the defendants (including TNB) certain of the claims previously set forth in the SAC. As a result, only the claims for (i) aiding, abetting and participating in breaches of fiduciary duty, (ii) aiding, abetting and participating in violations of the Texas Securities Act, and (iii) punitive damages remained as against TNB. On January 20, 2022, the court denied TNB’s motion for summary judgment, as well as the motion for summary judgment filed by all defendants (including TNB) with respect to OSIC claims that apply to all defendants. The parties to the action agreed that the case was to be tried in the District Court for the Southern District of Texas. On March 25, 2021, the District Court for the Northern District of Texas rescinded its previously-issued trial scheduling orders so that the Southern District of Texas could set scheduling for this case once the case had in fact been remanded. On January 19, 2022, the judge of the District Court for the Northern District of Texas to whom the case was then assigned issued a recommendation to the Judicial Panel on Multidistrict Litigation (the Panel) that the case be remanded to the District Court for the Southern District of Texas in light of the judge’s determination with respect to the summary judgment motions that triable issues of fact exist. On January 21, 2022, the Panel approved the remand of the case to the District Court for the Southern District of Texas, and on January 28, 2022 the remand of the case became effective. On June 9, 2022, the court entered an order scheduling trial to begin February 27, 2023, which was to be held as a jury trial in front of Judge Kenneth M. Hoyt of the District Court for the Southern District of Texas. On December 14, 2009, a different Stanford-related lawsuit was filed in the District Court of Ascension Parish, Louisiana, individually by Harold Jackson, Paul Blaine and Carolyn Bass Smith, Christine Nichols, and Ronald and Ramona Hebert naming TNB (misnamed as Trust National Bank) and other individuals and entities not affiliated with Trustmark as defendants (the Jackson Action). The complaint seeks to recover the money lost by these individual plaintiffs as a result of the collapse of the Stanford Financial Group (in addition to other damages) under various theories and causes of action, including negligence, breach of contract, breach of fiduciary duty, negligent misrepresentation, detrimental reliance, conspiracy, and violation of Louisiana’s uniform fiduciary, securities, and racketeering laws. The complaint does not quantify the amount of money the plaintiffs seek to recover. In January 2010, the lawsuit was removed to federal court by certain defendants and then transferred by the United States Panel on Multidistrict Litigation to federal court in the Northern District of Texas (Dallas) where multiple Stanford related matters are being consolidated for pre-trial proceedings. On March 29, 2010, the court stayed the case. TNB filed a motion to lift the stay, which was denied on February 28, 2012. In September 2012, the district court referred the case to a magistrate judge for hearing and determination of certain pretrial issues. On April 11, 2016, Trustmark learned that a different Stanford-related lawsuit had been filed on that date in the Superior Court of Justice in Ontario, Canada, by The Toronto-Dominion Bank (TD Bank), naming TNB and three other financial institutions not affiliated with Trustmark as defendants (the TD Bank Declaratory Action). The complaint seeks a declaration specifying the degree to which each of TNB and the other defendants are liable in respect of any loss and damage for which TD Bank is found to be liable in separate litigation commenced against TD Bank brought by the joint liquidators of Stanford International Bank Limited in the Superior Court of Justice, Commercial List in Ontario, Canada (the Joint Liquidators’ Action), as well as contribution and indemnity in respect of any judgment, interest and costs TD Bank is ordered to pay in the Joint Liquidators’ Action. Trustmark understands that on or about June 8, 2021, after an extensive trial on the merits, the judge in the Joint Liquidators’ Action ruled in favor of TD Bank and found TD Bank not liable as to the claims asserted against the bank by the joint liquidators of Stanford International Bank Limited. The plaintiffs in the Joint Liquidators’ Action appealed this decision. On November 17, 2022, the intermediate appellate court in Canada dismissed the appeal. On January 16, 2023, the plaintiffs in the Joint Liquidators’ Action filed an application with the Supreme Court of Canada for leave to appeal, which the Supreme Court of Canada dismissed on July 20, 2023. TNB was never served in connection with the TD Bank Declaratory Action (including any of the appeals), and thus has not made an appearance in that action. On November 1, 2019, TNB was named as a defendant in a complaint filed by Paul Blaine Smith, Carolyn Bass Smith and other plaintiffs identified therein (the Smith Action and, collectively with the Rotstain Action and the Jackson Action, the Actions). The Smith Action was filed in Texas state court (District Court, Harris County, Texas) and named TNB and four other financial institutions and one individual, each of which are unaffiliated with Trustmark, as defendants. The Smith Action relates to the collapse of the Stanford Financial Group, as does the other pending litigation relating to Stanford summarized above. Plaintiffs in the Smith Action demanded a jury trial. On January 15, 2020, the court granted Stanford Financial Group receiver’s motion to stay the Texas state court action. On February 26, 2020, the lawsuit was removed to federal court in the Southern District of Texas by TNB. On December 31, 2022, 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) Trustmark. 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. If the Court’s approval (as described below) of the Stanford Settlement Agreement, including the bar orders described below, is upheld on appeal, Trustmark will make a one-time cash payment of $ 100.0 million to the Stanford Receiver. 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 Trustmark and its related parties relating to Stanford, whether asserted to date or not. The bar orders therefore would 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 is a condition of the Stanford Settlement. The Stanford Settlement Agreement is 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. While Trustmark believes that the Stanford Settlement Agreement is consistent with the terms of prior Stanford-related settlements that have been approved by the Court and were not successfully appealed, it is possible that the Court’s approval of the Stanford Settlement Agreement (which has occurred, as described further below) may not be upheld on appeal. The Stanford Settlement Agreement also provides that Trustmark 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, Trustmark 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. Trustmark’s relationship with Stanford began as a result of Trustmark’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. On August 8, 2023, Mr. Stanford filed a motion for stay of mandate pending petition for certiorari. On August 22, 2023, the Fifth Circuit denied the motion for stay of mandate. On August 30, 2023, the Fifth Circuit issued the mandate. The Stanford Settlement will become effective when the trial court’s ruling approving the Stanford Settlement and entering the bar order becomes final and non-appealable, as defined in the Stanford Settlement Agreement (the Stanford Settlement Effective Date). Within five days of the Stanford Settlement Effective Date, the parties to the Rotstain and Smith Actions will file agreed dismissals of those cases. Absent any further appeal in either of the Rotstain or Smith Actions, those dismissals will become final 30 days after entered and signed by the respective judges. Trustmark will be required to make the Stanford Settlement payment within 16 days after those dismissals become final. Any further appeal of any of the orders described above would delay the making of the Stanford Settlement payment. On August 11, 2023, the Stanford Receiver filed a Motion to Enforce Settlement Agreement in the Northern District of Texas District Court, asking Judge Godbey to rule that the Stanford Settlement Effective Date has occurred. The Stanford Receiver took the position that Mr. Stanford’s appeals are frivolous and do not prevent the trial court’s ruling from becoming final and non-appealable, as defined in the Stanford Settlement Agreement. Trustmark filed a response in opposition to the Stanford Receiver’s Motion to Enforce. The trial court has not yet ruled on the Motion to Enforce. On September 22, 2023, the Stanford Receiver filed a Motion to Enjoin, requesting that the trial court enjoin Mr. Stanford from making court filings in any Stanford-related case, including notices of appeal, without obtaining leave of the court. The court has not yet ruled on the Motion to Enjoin. Pending the resolution of the Stanford Settlement approval process, the Rotstain, Smith and Jackson Actions are stayed. On December 30, 2019, a complaint was filed in the United States District Court for the Southern District of Mississippi, Northern Division by Alysson Mills in her capacity as Court-appointed Receiver (the Adams/Madison Timber Receiver) for Arthur Lamar Adams and Madison Timber Properties, LLC (collectively, Adams/Madison Timber), naming TNB, two other Mississippi-based financial institutions both of which are unaffiliated with TNB and two individuals, one of who was employed by TNB at all times relevant to the complaint and the other was employed either by TNB or one of the other defendant financial institutions, as defendants (the Adams/Madison Timber Action). The complaint seeks to recover from the defendants, for the benefit of the receivership estate and also for certain investors who were allegedly defrauded by Adams/Madison Timber, damages (including punitive damages) and related costs allegedly attributable to actions of the defendants that allegedly enabled illegal and fraudulent activities engaged in by Adams/Madison Timber. The Adams/Madison Timber Receiver did not quantify damages. By order issued by the court on September 30, 2021, the action to which TNB is a party was consolidated with three other pending cases for purposes of discovery, based upon a finding by the court that the actions involve overlapping questions of law and fact. TNB’s relationship with Adams/Madison Timber consisted of traditional banking services in the ordinary course of business. TNB 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. 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 will fully release all claims against TNB and any of its employees, agents and representatives. The Adams/Madison Timber Settlement includes 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. The bar orders therefore would prohibit all litigation relating to Adams/Madison Timber described herein. Final Court approval of a bar order is a condition of the Adams/Madison Timber Settlement. The Adams/Madison Timber Settlement is also 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. The timing of any final decision by the Court is subject to the discretion of the Court and any appeal. If the Adams/Madison Timber Settlement, including the bar order described above, is approved by the Court and is not subject to further appeal, TNB will make a one-time cash payment of $ 6.5 million to the Adams/Madison Timber Receiver. While TNB believes that the Adams/Madison Timber Settlement is consistent with the terms of settlements in similar cases that have been approved and were not successfully appealed, it is possible that the Court may decide not to approve the Adams/Madison Timber Settlement Agreement or that the Court of Appeals could reject the Adams/Madison Timber Settlement Agreement on an appeal, either of which could render the Adams/Madison Timber Settlement a nullity. 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 expects that both the Stanford Settlement and Adams/Madison Timber Settlement will be tax deductible. 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.

Earnings Per Share (EPS)

Earnings Per Share (EPS)	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Earnings Per Share (EPS)	Note 13 – Earnings Per Share (EPS) The following table reflects weighted-average shares used to calculate basic and diluted EPS for the periods presented (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Basic shares 61,070 61,115 61,048 61,334 Dilutive shares 193 204 171 186 Diluted shares 61,263 61,319 61,219 61,520 Weighted-average antidilutive stock awards were excluded in determining diluted EPS. The following table reflects weighted-average antidilutive stock awards for the periods presented (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Weighted-average antidilutive stock awards 23 — 75 —

Statements of Cash Flows

Statements of Cash Flows	9 Months Ended
	Sep. 30, 2023
Supplemental Cash Flow Information [Abstract]
Statements of Cash Flows	Note 14 – Statements of Cash Flows The following table reflects specific transaction amounts for the periods presented ($ in thousands): Nine Months Ended September 30, 2023 2022 Income taxes paid $ 34,898 $ 1,241 Interest expense paid on deposits and borrowings 214,745 17,077 Noncash transfers from loans to other real estate 5,434 1,430 Operating right-of-use assets resulting from lease liabilities 7,092 6,572

Shareholders' Equity

Shareholders' Equity	9 Months Ended
	Sep. 30, 2023
Stockholders' Equity Note [Abstract]
Shareholders' Equity	Note 15 – Shareholders’ Equity Regulatory Capital Trustmark and TNB are subject to minimum risk-based capital and leverage capital requirements, as described in the section captioned “Capital Adequacy” included in Part I. Item 1. – Business of Trustmark’s 2022 Annual Report, which are administered by the federal bank regulatory agencies. These capital requirements, as defined by federal regulations, involve quantitative and qualitative measures of assets, liabilities and certain off-balance sheet instruments. Trustmark’s and TNB’s minimum risk-based capital requirements include a capital conservation buffer of 2.50 %. 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. As of September 30, 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 September 30, 2023. To be categorized in this manner, Trustmark and TNB maintained, as applicable, minimum common equity Tier 1 risk-based capital, Tier 1 risk-based capital, total risk-based capital and Tier 1 leverage ratios as set forth in the accompanying table, and were not subject to any written agreement, order or capital directive, or prompt corrective action directive issued by their primary federal regulators to meet and maintain a specific capital level for any capital measures. There are no significant conditions or events that have occurred since September 30, 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 September 30, 2023 and December 31, 2022 ($ in thousands): Actual Regulatory Capital Minimum To Be Well Amount Ratio Requirement Capitalized At September 30, 2023: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,498,217 9.89 % 7.00 % n/a Trustmark National Bank 1,579,132 10.43 % 7.00 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,558,217 10.29 % 8.50 % n/a Trustmark National Bank 1,579,132 10.43 % 8.50 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,834,295 12.11 % 10.50 % n/a Trustmark National Bank 1,731,783 11.44 % 10.50 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,558,217 8.49 % 4.00 % n/a Trustmark National Bank 1,579,132 8.63 % 4.00 % 5.00 % At December 31, 2022: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,413,672 9.74 % 7.00 % n/a Trustmark National Bank 1,501,889 10.34 % 7.00 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,473,672 10.15 % 8.50 % n/a Trustmark National Bank 1,501,889 10.34 % 8.50 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,729,499 11.91 % 10.50 % n/a Trustmark National Bank 1,634,454 11.26 % 10.50 % 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 % Stock Repurchase Program 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 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 may be acquired through December 31, 2023. 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 periods presented ($ in thousands). The amortization of prior service cost, recognized net loss due to lump sum settlements and change in net actuarial loss are included in the computation of net periodic benefit cost (see Note 10 – Defined Benefit and Other Postretirement Benefits for additional details). Reclassification adjustments related to pension and other postretirement benefit plans are included in salaries and employee benefits and other expense in the accompanying consolidated statements of income. 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. Three Months Ended September 30, 2023 Three Months Ended September 30, 2022 Before Tax Tax (Expense) Net of Tax Before Tax Tax (Expense) Net of Tax Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising $ ( 26,963 ) $ 6,740 $ ( 20,223 ) $ ( 114,317 ) $ 28,580 $ ( 85,737 ) Change in net unrealized holding loss on 4,000 ( 1,000 ) 3,000 1,800 ( 450 ) 1,350 Total securities available for sale ( 22,963 ) 5,740 ( 17,223 ) ( 112,517 ) 28,130 ( 84,387 ) Pension and other postretirement benefit plans: Reclassification adjustments for changes Net change in prior service costs 28 ( 7 ) 21 28 ( 7 ) 21 Recognized net loss due to lump sum — — — — — — Change in net actuarial loss 70 ( 18 ) 52 295 ( 74 ) 221 Total pension and other postretirement 98 ( 25 ) 73 323 ( 81 ) 242 Cash flow hedge derivatives: Change in accumulated gain (loss) on effective ( 11,338 ) 2,834 ( 8,504 ) ( 19,524 ) 4,881 ( 14,643 ) Reclassification adjustment for (gain) loss realized 4,627 ( 1,157 ) 3,470 ( 643 ) 161 ( 482 ) Total cash flow hedge derivatives ( 6,711 ) 1,677 ( 5,034 ) ( 20,167 ) 5,042 ( 15,125 ) Total other comprehensive income (loss) $ ( 29,576 ) $ 7,392 $ ( 22,184 ) $ ( 132,361 ) $ 33,091 $ ( 99,270 ) Nine Months Ended September 30, 2023 Nine Months Ended September 30, 2022 Before Tax Tax (Expense) Net of Tax Before Tax Tax (Expense) Net of Tax Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising $ ( 16,062 ) $ 4,246 $ ( 11,816 ) $ ( 314,517 ) $ 78,630 $ ( 235,887 ) Change in net unrealized holding loss on 11,799 ( 2,950 ) 8,849 ( 31,451 ) 7,863 ( 23,588 ) Total securities available for sale ( 4,263 ) 1,296 ( 2,967 ) ( 345,968 ) 86,493 ( 259,475 ) Pension and other postretirement benefit plans: Reclassification adjustments for changes Net change in prior service costs 83 ( 21 ) 62 83 ( 21 ) 62 Recognized net loss due to lump sum 25 ( 6 ) 19 — — — Change in net actuarial loss 216 ( 54 ) 162 914 ( 228 ) 686 Total pension and other postretirement 324 ( 81 ) 243 997 ( 249 ) 748 Cash flow hedge derivatives: Change in accumulated gain (loss) on effective ( 24,569 ) 6,142 ( 18,427 ) ( 19,524 ) 4,881 ( 14,643 ) Reclassification adjustment for (gain) loss realized 11,555 ( 2,889 ) 8,666 ( 643 ) 161 ( 482 ) Total cash flow hedge derivatives ( 13,014 ) 3,253 ( 9,761 ) ( 20,167 ) 5,042 ( 15,125 ) Total other comprehensive income (loss) $ ( 16,953 ) $ 4,468 $ ( 12,485 ) $ ( 365,138 ) $ 91,286 $ ( 273,852 ) 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 Defined Cash Flow Total Balance at January 1, 2023 $ ( 254,442 ) $ ( 5,792 ) $ ( 15,169 ) $ ( 275,403 ) Other comprehensive income (loss) before reclassification ( 2,967 ) — ( 18,427 ) ( 21,394 ) Amounts reclassified from accumulated other — 243 8,666 8,909 Net other comprehensive income (loss) ( 2,967 ) 243 ( 9,761 ) ( 12,485 ) Balance at September 30, 2023 $ ( 257,409 ) $ ( 5,549 ) $ ( 24,930 ) $ ( 287,888 ) Balance at January 1, 2022 $ ( 17,774 ) $ ( 14,786 ) $ — $ ( 32,560 ) Other comprehensive income (loss) before reclassification ( 259,475 ) — ( 14,643 ) ( 274,118 ) Amounts reclassified from accumulated other — 748 ( 482 ) 266 Net other comprehensive income (loss) ( 259,475 ) 748 ( 15,125 ) ( 273,852 ) Balance at September 30, 2022 $ ( 277,249 ) $ ( 14,038 ) $ ( 15,125 ) $ ( 306,412 )

Fair Value

Fair Value	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value	Note 16 – Fair Value Financial Instruments Measured at Fair Value The methodologies Trustmark uses in determining the fair values are based primarily on the use of independent, market-based data to reflect a value that would be reasonably expected upon exchange of the position in an orderly transaction between market participants at the measurement date. The predominant portion of assets that are stated at fair value are of a nature that can be valued using prices or inputs that are readily observable through a variety of independent data providers. The providers selected by Trustmark for fair valuation data are widely recognized and accepted vendors whose evaluations support the pricing functions of financial institutions, investment and mutual funds, and portfolio managers. Trustmark has documented and evaluated the pricing methodologies used by the vendors and maintains internal processes that regularly test valuations for anomalies. Trustmark utilizes an independent pricing service to advise it on the carrying value of the securities available for sale portfolio. As part of Trustmark’s procedures, the price provided from the service is evaluated for reasonableness given market changes. When a questionable price exists, Trustmark investigates further to determine if the price is valid. If needed, other market participants may be utilized to determine the correct fair value. Trustmark has also reviewed and confirmed its determinations in thorough discussions with the pricing source regarding their methods of price discovery. Mortgage loan commitments are valued based on the securities prices of similar collateral, term, rate and delivery for which the loan is eligible to deliver in place of the particular security. Trustmark acquires a broad array of mortgage security prices that are supplied by a market data vendor, which in turn accumulates prices from a broad list of securities dealers. Prices are processed through a mortgage pipeline management system that accumulates and segregates all loan commitment and forward-sale transactions according to the similarity of various characteristics (maturity, term, rate, and collateral). Prices are matched to those positions that are deemed to be an eligible substitute or offset ( i.e ., “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 September 30, 2023 and December 31, 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 nine months ended September 30, 2023 and the year ended December 31, 2022. September 30, 2023 Total Level 1 Level 2 Level 3 U.S. Treasury securities $ 363,476 $ 363,476 $ — $ — U.S. Government agency obligations 6,780 — 6,780 — Obligations of states and political subdivisions 4,642 — 4,642 — Mortgage-backed securities 1,391,276 — 1,391,276 — Securities available for sale 1,766,174 363,476 1,402,698 — LHFS 169,244 — 169,244 — MSR 142,379 — — 142,379 Other assets - derivatives 16,846 8 16,641 197 Other liabilities - derivatives 56,135 3,327 52,808 — 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 nine months ended September 30, 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) 1,677 1,672 Additions 11,025 — Sales — ( 1,632 ) Balance, September 30, 2023 $ 142,379 $ 197 The amount of total gains (losses) for the period included in earnings $ 8,734 $ 559 Balance, January 1, 2022 $ 87,687 $ 1,859 Total net (loss) gain included in Mortgage banking, net (1) 30,476 ( 401 ) Additions 14,452 — Sales — ( 2,326 ) Balance, September 30, 2022 $ 132,615 $ ( 868 ) The amount of total gains (losses) for the period included in $ 41,530 $ ( 1,181 ) (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 September 30, 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 September 30, 2023 , Trustmark had outstanding balances of $ 47.4 million with a related ACL of $ 15.0 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 $ 765 thousand were remeasured during the first nine months of 2023 , requiring write-downs of $ 205 thousand to reach their current fair values compared to $ 3.0 million of foreclosed assets that were remeasured during the first nine months of 2022 , requiring write-downs of $ 1.0 million. Fair Value of Financial Instruments FASB ASC Topic 825, “Financial Instruments,” requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis. The carrying amounts and estimated fair values of financial instruments at September 30, 2023 and December 31, 2022, are as follows ($ in thousands): September 30, 2023 December 31, 2022 Carrying Estimated Carrying Estimated Financial Assets: Level 2 Inputs: Cash and short-term investments $ 750,492 $ 750,492 $ 738,787 $ 738,787 Securities held to maturity 1,438,287 1,312,871 1,494,514 1,406,589 Level 3 Inputs: Net LHFI 12,676,228 12,505,990 12,083,825 11,850,318 Financial Liabilities: Level 2 Inputs: Deposits 15,101,923 15,076,677 14,437,648 14,404,661 Federal funds purchased and securities sold under 321,799 321,799 449,331 449,331 Other borrowings 793,193 793,188 1,050,938 1,050,932 Subordinated notes 123,427 103,750 123,262 113,125 Junior subordinated debt securities 61,856 45,928 61,856 46,392 Fair Value Option Trustmark has elected to account for its mortgage LHFS under the fair value option, with interest income on these mortgage LHFS reported in interest and fees on LHFS and LHFI. The fair value of the mortgage LHFS is determined using quoted prices for a similar asset, adjusted for specific attributes of that loan. The mortgage LHFS are actively managed and monitored and certain market risks of the loans may be mitigated through the use of derivatives. These derivative instruments are carried at fair value with changes in fair value recorded as noninterest income in mortgage banking, net. The changes in the fair value of LHFS are largely offset by changes in the fair value of the derivative instruments. For the three and nine months ended September 30, 2023 , net losses of $ 602 thousand and $ 841 thousand, respectively, were recorded as noninterest income in mortgage banking, net for changes in the fair value of LHFS accounted for under the fair value option, compared to net losses of $ 4.4 million and $ 6.7 million for the three and nine months ended September 30, 2022, respectively. Interest and fees on LHFS and LHFI for the three and nine months ended September 30, 2023 included $ 2.3 million and $ 5.9 million, respectively, of interest earned on LHFS accounted for under the fair value option, compared to $ 2.0 million and $ 5.2 million for the three and nine months ended September 30, 2022 , respectively. Election of the fair value option allows Trustmark to reduce the accounting volatility that would otherwise result from the asymmetry created by accounting for the financial instruments at the lower of cost or fair value and the derivatives at fair value. The fair value option election does not apply to GNMA optional repurchase loans which do not meet the requirements under FASB ASC Topic 825 to be accounted for under the fair value option. GNMA optional repurchase loans totaled $ 63.7 million and $ 70.8 million at September 30, 2023 and December 31, 2022, respectively, and are included in LHFS on the accompanying consolidated balance sheets. For additional information regarding GNMA optional repurchase loans, please see the section captioned “Past Due LHFS” included in Note 3 – LHFI and ACL, LHFI. The following table provides information about the fair value and the contractual principal outstanding of LHFS accounted for under the fair value option at September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 December 31, 2022 Fair value of LHFS $ 105,542 $ 64,421 LHFS contractual principal outstanding 105,618 63,427 Fair value less unpaid principal $ ( 76 ) $ 994

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Note 17 – 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 September 30, 2023 , the aggregate notional value of Trustmark's interest rate swaps and floor spreads designated as cash flow hedges totaled $ 1.000 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 $ 13 thousand and $ 35 thousand of amortization expense for the three and nine months ended September 30, 2023, respectively, and are included in interest and fees on LHFS and LHFI. As interest payments are received on Trustmark's variable-rate a ssets, 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 $ 18.4 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 $ 270.0 million at September 30, 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 $ 1.0 million and $ 928 thousand for the three months ended September 30, 2023 and 2022, respectively. For the nine months ended September 30, 2023 and 2022 , the impact was a net negative ineffectiveness of $ 4.1 million and $ 554 thousand, respectively. As part of Trustmark’s risk management strategy in the mortgage banking area, derivative instruments such as forward sales contracts are utilized. Trustmark’s obligations under forward sales contracts consist of commitments to deliver mortgage loans, originated and/or purchased, in the secondary market at a future date. Changes in the fair value of these derivative instruments are recorded as noninterest income in mortgage banking, net and are offset by changes in the fair value of LHFS. Trustmark’s off-balance sheet obligations under these derivative instruments totaled $ 133.0 million at September 30, 2023 , with a positive valuation adjustment of $ 1.5 million, compared to $ 97.0 million, with a positive valuation adjustment of $ 168 thousand, at December 31, 2022. 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 $ 96.8 million at September 30, 2023 , with a positive valuation adjustment of $ 197 thousand, compared to $ 68.4 million, with a positive valuation adjustment of $ 157 thousand, at December 31, 2022. Trustmark offers certain derivatives products directly to qualified commercial lending clients seeking to manage their interest rate risk. Trustmark economically hedges interest rate swap transactions executed with commercial lending clients by entering into offsetting interest rate swap transactions with institutional derivatives market participants. Derivatives transactions executed as part of this program are not designated as qualifying hedging relationships and are, therefore, carried at fair value with the change in fair value recorded as noninterest income in bank card and other fees. Because these derivatives have mirror-image contractual terms, in addition to collateral provisions which mitigate the impact of non-performance risk, the changes in fair value are expected to substantially offset. The Chicago Mercantile Exchange rules legally characterize variation margin collateral payments made or received for centrally cleared interest rate swaps as settlements rather than collateral. As a result, centrally cleared interest rate swaps included in other assets and other liabilities are presented on a net basis in the accompanying consolidated balance sheets. At September 30, 2023 , Trustmark had interest rate swaps with an aggregate notional amount of $ 1.365 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 both September 30, 2023 and December 31, 2022 , there was no 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. At September 30, 2023 and December 31, 2022 , Trustmark had posted collateral of $ 40 thousand 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 September 30, 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 September 30, 2023 and December 31, 2022, Trustmark had entered into five risk p articipation agreements as a beneficiary with aggregate notional amounts of $ 49.1 million and $ 50.2 million, respectively. At September 30, 2023 , Trustmark had entered into thirty-four risk participation agreements as a guarantor with an aggregate notional amount of $ 281.9 million compared to twenty-nine risk participation agreements as a guarantor with an aggregate notional amount of $ 235.8 million at December 31, 2022. The aggregate fair values of these risk participation agreements were immaterial at both September 30, 2023 and December 31, 2022. Tabular Disclosures The following tables disclose the fair value of derivative instruments in Trustmark’s consolidated balance sheets at September 30, 2023 and December 31, 2022 as well as the effect of these derivative instruments on Trustmark’s results of operations for the periods presented ($ in thousands): September 30, 2023 December 31, 2022 Derivatives in hedging relationships: Interest rate contracts: Interest rate floors included in other assets $ 203 $ — Interest rate swaps included in other liabilities (1) 2,302 761 Derivatives not designated as hedging instruments: Interest rate contracts: Exchange traded purchased options included in other assets $ 8 $ 38 OTC written options (rate locks) included in other assets 197 157 Futures contracts included in other assets — 16 Interest rate swaps included in other assets (1) 16,437 8,654 Credit risk participation agreements included in other assets 1 6 Futures contracts included in other liabilities 2,764 268 Forward contracts included in other liabilities ( 1,479 ) ( 168 ) Exchange traded written options included in other liabilities 563 206 Interest rate swaps included in other liabilities (1) 51,953 44,304 Credit risk participation agreements included in other liabilities 32 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. Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Derivatives in hedging relationships: Amount of gain (loss) reclassified from accumulated other $ ( 4,627 ) $ 643 $ ( 11,555 ) $ 643 Derivatives not designated as hedging instruments: Amount of gain (loss) recognized in mortgage banking, net $ ( 7,634 ) $ ( 8,405 ) $ ( 11,526 ) $ ( 39,181 ) Amount of gain (loss) recognized in bank card and other fees 381 63 571 385 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): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Derivatives in cash flow hedging relationship Amount of gain (loss) recognized in other comprehensive $ ( 8,504 ) $ ( 14,643 ) $ ( 18,427 ) $ ( 14,643 ) Trustmark’s interest rate swap derivative instruments are subject to master netting agreements, and therefore, eligible for offsetting in the consolidated balance sheets. Trustmark has elected to not offset any derivative instruments in its consolidated balance sheets. Information about financial instruments that are eligible for offset in the consolidated balance sheets as of September 30, 2023 and December 31, 2022 is presented in the following tables ($ in thousands): Offsetting of Derivative Assets As of September 30, 2023 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts of Financial Cash Collateral Net Amount Derivatives $ 16,640 $ — $ 16,640 $ ( 2,618 ) $ ( 6,230 ) $ 7,792 Offsetting of Derivative Liabilities As of September 30, 2023 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts of Financial Cash Collateral Net Amount Derivatives $ 54,255 $ — $ 54,255 $ ( 2,618 ) $ ( 40 ) $ 51,597 Offsetting of Derivative Assets As of December 31, 2022 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts 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	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Segment Information	Note 18 – Segment Information Trustmark’s management reporting structure includes three segments: General Banking, Wealth Management and Insurance. For a complete overview of Trustmark’s operating segments, see Note 20 – Segment Information included in Part II. Item 8. – Financial Statements and Supplementary Data, of Trustmark’s 2022 Annual Report. The accounting policies of each reportable segment are the same as those of Trustmark except for its internal allocations. Noninterest expenses for back-office operations support are allocated to segments based on estimated uses of those services. Trustmark measures the net interest income of its business segments with a process that assigns cost of funds or earnings credit on a matched-term basis. This process, called “funds transfer pricing”, charges an appropriate cost of funds to assets held by a business unit, or credits the business unit for potential earnings for carrying liabilities. The net of these charges and credits flows through to the General Banking Segment, which contains the management team responsible for determining TNB’s funding and interest rate risk strategies. The following table discloses financial information by reportable segment for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 General Banking Net interest income $ 137,145 $ 134,842 $ 411,682 $ 344,185 Provision for credit losses 10,646 11,595 20,015 10,785 Noninterest income 28,181 29,690 85,535 91,170 Noninterest expense 122,045 108,740 345,329 318,425 Income before income taxes 32,635 44,197 131,873 106,145 Income taxes 5,245 6,396 19,024 14,571 General banking net income $ 27,390 $ 37,801 $ 112,849 $ 91,574 Selected Financial Information Total assets $ 18,099,301 $ 16,897,083 $ 18,099,301 $ 16,897,083 Depreciation and amortization $ 9,483 $ 9,439 $ 25,496 $ 29,610 Wealth Management Net interest income $ 1,494 $ 1,266 $ 4,462 $ 3,948 Provision for credit losses ( 2,220 ) ( 2 ) ( 2,131 ) ( 10 ) Noninterest income 8,740 9,007 26,293 27,105 Noninterest expense 8,281 8,224 24,276 24,637 Income before income taxes 4,173 2,051 8,610 6,426 Income taxes 1,043 515 2,153 1,609 Wealth management net income $ 3,130 $ 1,536 $ 6,457 $ 4,817 Selected Financial Information Total assets $ 194,837 $ 205,873 $ 194,837 $ 205,873 Depreciation and amortization $ 63 $ 71 $ 199 $ 217 Insurance Net interest income $ ( 2 ) $ ( 3 ) $ ( 8 ) $ ( 8 ) Noninterest income 15,303 13,909 45,326 41,699 Noninterest expense 10,619 9,734 31,885 28,922 Income before income taxes 4,682 4,172 13,433 12,769 Income taxes 1,173 1,054 3,373 3,210 Insurance net income $ 3,509 $ 3,118 $ 10,060 $ 9,559 Selected Financial Information Total assets $ 96,701 $ 87,678 $ 96,701 $ 87,678 Depreciation and amortization $ 135 $ 159 $ 434 $ 527 Consolidated Net interest income $ 138,637 $ 136,105 $ 416,136 $ 348,125 Provision for credit losses 8,426 11,593 17,884 10,775 Noninterest income 52,224 52,606 157,154 159,974 Noninterest expense 140,945 126,698 401,490 371,984 Income before income taxes 41,490 50,420 153,916 125,340 Income taxes 7,461 7,965 24,550 19,390 Consolidated net income $ 34,029 $ 42,455 $ 129,366 $ 105,950 Selected Financial Information Total assets $ 18,390,839 $ 17,190,634 $ 18,390,839 $ 17,190,634 Depreciation and amortization $ 9,681 $ 9,669 $ 26,129 $ 30,354

Accounting Policies Recently Ad

Accounting Policies Recently Adopted and Pending Accounting Pronouncements	9 Months Ended
	Sep. 30, 2023
Accounting Standards Update and Change in Accounting Principle [Abstract]
Accounting Policies Recently Adopted and Pending Accounting Pronouncements	Note 19 – Accounting Policies Recently Adopted and Pending Accounting Pronouncements Accounting Policies Recently Adopted Except for the changes detailed below, Trustmark has consistently applied its accounting policies to all periods presented in the accompanying consolidated financial statements. ASU 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 are 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. Early adoption is permitted, provided that an entity has adopted ASU 2016-13. If an entity elects to early adopt the amendments of this ASU during an interim period, the guidance should be applied as of the beginning of the fiscal year that includes the interim period. In addition, an entity may elect to early adopt the amendments about TDRs and related disclosure enhancements separately from the amendments related to vintage disclosures. 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 no t 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 3 - LHFI and ACL, LHFI of this report.

Accounting Policies Recently _2

Accounting Policies Recently Adopted and Pending Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Securities Available for Sale	Securities Available for Sale Quarterly, Trustmark evaluates if any security has a fair value less than its amortized cost. Once these securities are identified, in order to determine whether a decline in fair value resulted from a credit loss or other factors, Trustmark performs further analysis. If Trustmark determines that a credit loss exists, the credit portion of the allowance is measured using a discounted cash flow (DCF) analysis using the effective interest rate as of the security’s purchase date. The amount of credit loss recorded by Trustmark is limited to the amount by which the amortized cost exceeds the fair value. The DCF analysis utilizes contractual maturities, as well as third-party credit ratings and cumulative default rates published annually by Moody’s Investor Service (Moody’s). At both September 30, 2023 and December 31, 2022 , the results of the analysis 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 September 30, 2023 , accrued interest receivable totaled $ 3.6 million for securities available for sale compared to $ 4.0 million at December 31, 2022 and was reported in other assets on the accompanying consolidated balance sheet.
Securities Held to Maturity	Securities Held to Maturity At September 30, 2023 and December 31, 2022, the potential for credit loss exposure for Trustmark's securities held to maturity was $ 341 thousand and $ 4.5 million, respectively, and consisted of municipal securities. After applying appropriate probability of default (PD) and loss given default (LGD) assumptions, the total amount of current expected credit losses was deemed immaterial. Therefore, no reserve was recorded at September 30, 2023 and December 31, 2022. Accrued interest receivable is excluded from the estimate of credit losses for securities held to maturity. At September 30, 2023 , accrued interest receivable totaled $ 2.6 million for securities held to maturity compared to $ 2.7 million at December 31, 2022 and was reported in other assets on the accompanying consolidated balance sheet. At both September 30, 2023 and December 31, 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 September 30, 2023 and December 31, 2022 .
Allowance for Credit Losses, LHFI (ACL)	ACL on LHFI Trustmark’s ACL methodology for LHFI is based upon guidance within the Financial Accounting Standards Board (FASB) Accounting Standards Codification (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 a credit 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 Equipment finance leases WARM Southern Unemployment, Southern GDP 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 Other commercial loans Other loans DCF Prime Rate, Southern Unemployment Commercial and industrial - DCF Trustmark historical data Commercial and industrial - DCF Trustmark historical data 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 four are currently considered active: (i) economic conditions and concentrations of credit, (ii) nature and volume of the portfolio, (iii) performance trends and (iv) external factors. Two of Trustmark’s largest loan classes are the loans secured by nonfarm, nonresidential properties and the loans secured by other real estate. Trustmark elected to create a qualitative factor specifically for these loan classes which addresses changes in the economic conditions of metropolitan areas and applies additional pool level reserves. This qualitative factor is based on third-party market data and forecast trends and is updated quarterly as information is available, by market and by loan pool. For the performance trends factor, Trustmark uses migration analyses to allocate additional ACL to non-pass/delinquent loans within each pool. In this way, Management believes the ACL will directly reflect changes in risk, based on the performance of the loans within a pool, whether declining or improving. The nature and volume of the portfolio qualitative factor utilizes peer and industry assumptions for pools of loans where Trustmark’s historical experience might not capture the risk associated within a specific pool due to it being a different type of lending, different sources of repayment or a new line of business. The external factors qualitative factor is Management’s best judgement on the loan or pool level impact of all factors that affect the portfolio that are not accounted for using any other part of the ACL methodology ( e.g. , natural disasters, changes in legislation, impacts due to technology and pandemics). 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 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.
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 are 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. Early adoption is permitted, provided that an entity has adopted ASU 2016-13. If an entity elects to early adopt the amendments of this ASU during an interim period, the guidance should be applied as of the beginning of the fiscal year that includes the interim period. In addition, an entity may elect to early adopt the amendments about TDRs and related disclosure enhancements separately from the amendments related to vintage disclosures. 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 no t 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 3 - LHFI and ACL, LHFI of this report.
Derivatives Designated as Hedging 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 September 30, 2023 , the aggregate notional value of Trustmark's interest rate swaps and floor spreads designated as cash flow hedges totaled $ 1.000 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 $ 13 thousand and $ 35 thousand of amortization expense for the three and nine months ended September 30, 2023, respectively, and are included in interest and fees on LHFS and LHFI. As interest payments are received on Trustmark's variable-rate a ssets, 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 $ 18.4 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 $ 270.0 million at September 30, 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 $ 1.0 million and $ 928 thousand for the three months ended September 30, 2023 and 2022, respectively. For the nine months ended September 30, 2023 and 2022 , the impact was a net negative ineffectiveness of $ 4.1 million and $ 554 thousand, respectively. As part of Trustmark’s risk management strategy in the mortgage banking area, derivative instruments such as forward sales contracts are utilized. Trustmark’s obligations under forward sales contracts consist of commitments to deliver mortgage loans, originated and/or purchased, in the secondary market at a future date. Changes in the fair value of these derivative instruments are recorded as noninterest income in mortgage banking, net and are offset by changes in the fair value of LHFS. Trustmark’s off-balance sheet obligations under these derivative instruments totaled $ 133.0 million at September 30, 2023 , with a positive valuation adjustment of $ 1.5 million, compared to $ 97.0 million, with a positive valuation adjustment of $ 168 thousand, at December 31, 2022. 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 $ 96.8 million at September 30, 2023 , with a positive valuation adjustment of $ 197 thousand, compared to $ 68.4 million, with a positive valuation adjustment of $ 157 thousand, at December 31, 2022. Trustmark offers certain derivatives products directly to qualified commercial lending clients seeking to manage their interest rate risk. Trustmark economically hedges interest rate swap transactions executed with commercial lending clients by entering into offsetting interest rate swap transactions with institutional derivatives market participants. Derivatives transactions executed as part of this program are not designated as qualifying hedging relationships and are, therefore, carried at fair value with the change in fair value recorded as noninterest income in bank card and other fees. Because these derivatives have mirror-image contractual terms, in addition to collateral provisions which mitigate the impact of non-performance risk, the changes in fair value are expected to substantially offset. The Chicago Mercantile Exchange rules legally characterize variation margin collateral payments made or received for centrally cleared interest rate swaps as settlements rather than collateral. As a result, centrally cleared interest rate swaps included in other assets and other liabilities are presented on a net basis in the accompanying consolidated balance sheets. At September 30, 2023 , Trustmark had interest rate swaps with an aggregate notional amount of $ 1.365 billion related to this program, compared to $ 1.391 billion at December 31, 2022 .

Securities Available for Sale_2

Securities Available for Sale and Held to Maturity (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2023 and December 31, 2022 ($ in thousands): Securities Available for Sale Securities Held to Maturity September 30, 2023 Amortized Gross Gross Estimated Amortized Gross Gross Estimated U.S. Treasury securities $ 396,070 $ — $ ( 32,594 ) $ 363,476 $ 28,872 $ 1 $ ( 987 ) $ 27,886 U.S. Government agency 7,309 — ( 529 ) 6,780 — — — — Obligations of states and 4,771 — ( 129 ) 4,642 341 — — 341 Mortgage-backed securities Residential mortgage pass- Guaranteed by GNMA 27,009 — ( 4,128 ) 22,881 13,090 — ( 1,083 ) 12,007 Issued by FNMA and 1,386,253 3 ( 214,735 ) 1,171,521 474,003 1 ( 36,482 ) 437,522 Other residential mortgage- Issued or guaranteed by 98,610 — ( 8,208 ) 90,402 162,031 — ( 14,474 ) 147,557 Commercial mortgage-backed Issued or guaranteed by 108,841 — ( 2,369 ) 106,472 759,950 1 ( 72,393 ) 687,558 Total $ 2,028,863 $ 3 $ ( 262,692 ) $ 1,766,174 $ 1,438,287 $ 3 $ ( 125,419 ) $ 1,312,871 Securities Available for Sale Securities Held to Maturity December 31, 2022 Amortized Gross Gross Estimated Amortized Gross Gross Estimated U.S. Treasury Securities $ 425,719 $ 308 $ ( 34,514 ) $ 391,513 $ 28,295 $ — $ ( 115 ) $ 28,180 U.S. Government agency 8,297 — ( 531 ) 7,766 — — — — Obligations of states and 4,820 53 ( 11 ) 4,862 4,510 3 ( 3 ) 4,510 Mortgage-backed securities Residential mortgage pass- Guaranteed by GNMA 30,534 7 ( 3,444 ) 27,097 4,442 — ( 395 ) 4,047 Issued by FNMA and 1,541,570 12 ( 196,119 ) 1,345,463 509,311 — ( 19,586 ) 489,725 Other residential mortgage- Issued or guaranteed by 123,755 — ( 8,615 ) 115,140 188,201 — ( 13,826 ) 174,375 Commercial mortgage-backed Issued or guaranteed by 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 September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 December 31, 2022 Aaa $ 1,437,946 $ 1,490,004 Aa1 to Aa3 — 3,001 Not Rated (1) 341 1,509 Total $ 1,438,287 $ 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 tables below include securities with gross unrealized losses for which an allowance for credit losses has not been recorded segregated by length of impairment at September 30, 2023 and December 31, 2022 ($ in thousands): Less than 12 Months 12 Months or More Total September 30, 2023 Estimated Gross Estimated Gross Estimated Gross U.S. Treasury securities $ 70,893 $ ( 2,494 ) $ 320,470 $ ( 31,087 ) $ 391,363 $ ( 33,581 ) U.S. Government agency obligations — — 6,742 ( 529 ) 6,742 ( 529 ) Obligations of states and political subdivisions 4,642 ( 129 ) — — 4,642 ( 129 ) Mortgage-backed securities Residential mortgage pass-through Guaranteed by GNMA 9,998 ( 652 ) 24,768 ( 4,559 ) 34,766 ( 5,211 ) Issued by FNMA and FHLMC 300,761 ( 15,670 ) 1,304,006 ( 235,547 ) 1,604,767 ( 251,217 ) Other residential mortgage-backed Issued or guaranteed by FNMA, 8,264 ( 314 ) 229,599 ( 22,368 ) 237,863 ( 22,682 ) Commercial mortgage-backed securities Issued or guaranteed by FNMA, 491,986 ( 44,734 ) 302,044 ( 30,028 ) 794,030 ( 74,762 ) Total $ 886,544 $ ( 63,993 ) $ 2,187,629 $ ( 324,118 ) $ 3,074,173 $ ( 388,111 ) 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 subdivisions 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 securities 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 )
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 September 30, 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 Amortized Estimated Amortized Estimated Due in one year or less $ 51,084 $ 49,189 $ 341 $ 341 Due after one year through five years 346,269 315,552 28,872 27,886 Due after five years through ten years 6,188 5,794 — — Due after ten years 4,609 4,363 — — 408,150 374,898 29,213 28,227 Mortgage-backed securities 1,620,713 1,391,276 1,409,074 1,284,644 Total $ 2,028,863 $ 1,766,174 $ 1,438,287 $ 1,312,871

LHFI and ACL, LHFI (Tables)

LHFI and ACL, LHFI (Tables)	6 Months Ended	9 Months Ended
	Jun. 30, 2023	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Loan Portfolio Held for Investment		At September 30, 2023 and December 31, 2022, LHFI consisted of the following ($ in thousands): September 30, 2023 December 31, 2022 Loans secured by real estate: Construction, land development and other land $ 655,381 $ 690,616 Other secured by 1-4 family residential properties 603,818 590,790 Secured by nonfarm, nonresidential properties 3,569,671 3,278,830 Other real estate secured 1,218,499 742,538 Other loans secured by real estate: Other construction 953,945 1,028,926 Secured by 1-4 family residential properties 2,289,788 2,185,057 Commercial and industrial loans 1,828,924 1,821,259 Consumer loans 165,556 170,230 State and other political subdivision loans 1,056,569 1,223,863 Other commercial loans 468,108 471,930 LHFI 12,810,259 12,204,039 Less ACL 134,031 120,214 Net LHFI $ 12,676,228 $ 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 September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 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 $ — $ 1,190 $ — Other secured by 1-4 family residential properties 3,801 6,339 727 Secured by nonfarm, nonresidential properties 20,973 24,009 — Other real estate secured — 111 — Other loans secured by real estate: Other construction — 63 — Secured by 1-4 family residential properties — 34,655 2,558 Commercial and industrial loans 88 10,575 39 Consumer loans — 254 480 Other commercial loans — 13,703 — Total $ 24,862 $ 90,899 $ 3,804 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 LHFI) at September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 Past Due 30-59 Days 60-89 Days 90 Days Total Past Due Current Total LHFI Loans secured by real estate: Construction, land development and $ 481 $ 241 $ 508 $ 1,230 $ 654,151 $ 655,381 Other secured by 1-4 family residential 6,527 1,460 2,007 9,994 593,824 603,818 Secured by nonfarm, nonresidential 1,120 57 1,155 2,332 3,567,339 3,569,671 Other real estate secured 224 — 42 266 1,218,233 1,218,499 Other loans secured by real estate: Other construction — — — — 953,945 953,945 Secured by 1-4 family residential properties 17,157 11,471 16,575 45,203 2,244,585 2,289,788 Commercial and industrial loans 5,413 1,156 1,040 7,609 1,821,315 1,828,924 Consumer loans 1,731 688 480 2,899 162,657 165,556 State and other political subdivision loans 110 — — 110 1,056,459 1,056,569 Other commercial loans 1,164 27 — 1,191 466,917 468,108 Total $ 33,927 $ 15,100 $ 21,807 $ 70,834 $ 12,739,425 $ 12,810,259 December 31, 2022 Past Due 30-59 Days 60-89 Days 90 Days More Total Past Due Current Total LHFI Loans secured by real estate: Construction, land development and $ 1,972 $ 199 $ 34 $ 2,205 $ 688,411 $ 690,616 Other secured by 1-4 family residential 3,682 1,206 1,281 6,169 584,621 590,790 Secured by nonfarm, nonresidential 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
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: Three Months Ended September 30, 2023 Payment Concession Term Extension Total % of Total Class of Loan Loans secured by real estate: Other secured by 1-4 family residential properties $ — $ 96 $ 96 0.02 % Other loans secured by real estate: Secured by 1-4 family residential properties — 346 346 0.02 % Total $ — $ 442 $ 442 0.00 % Nine Months Ended September 30, 2023 Payment Concession Term Extension Total % of Total Class of Loan Loans secured by real estate: Other secured by 1-4 family residential properties $ — $ 494 $ 494 0.08 % Secured by nonfarm, nonresidential properties — 370 370 0.01 % Other loans secured by real estate: Secured by 1-4 family residential properties — 912 912 0.04 % Commercial and industrial loans 255 — 255 0.01 % Consumer loans — 40 40 0.02 % Other commercial loans 116 31 147 0.03 % Total $ 371 $ 1,847 $ 2,218 0.02 %
Troubled debt restructurings on financial effect		The following tables detail the financial effect of the loan modifications presented above to borrowers experiencing financial difficulty for the periods presented: Three Months Ended September 30, 2023 Financial Effect Payment Concessions Term Extension Loans secured by real estate: Other secured by 1-4 family residential properties Modified lines of credit to amortize over 12 month and 24 month terms Other loans secured by real estate: Secured by 1-4 family residential properties Extended amortization on loans with term adjusted by weighted-average 10.6 years Nine Months Ended September 30, 2023 Financial Effect Payment Concessions Term Extension 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 3.2 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 Six month payment deferral One loan renewed and extended maturity by seven months
Troubled Debt Restructuring Related to Loans Held for Investment by Loan Type		The following tables provide details of the performance of such LHFI that have been modified during the periods presented ($ in thousands): Three Months Ended September 30, 2023 Past Due 30-59 Days 60-89 Days 90 Days Total Past Due Current Total Loans secured by real estate: Other secured by 1-4 family residential $ — $ — $ — $ — $ 96 $ 96 Other loans secured by real estate: Secured by 1-4 family residential properties — — — — 346 346 Total $ — $ — $ — $ — $ 442 $ 442 Nine Months Ended September 30, 2023 Past Due 30-59 Days 60-89 Days 90 Days Total Past Due Current Total Loans secured by real estate: Other secured by 1-4 family residential $ 272 $ — $ — $ 272 $ 222 $ 494 Secured by nonfarm, nonresidential — — — — 370 370 Other loans secured by real estate: Secured by 1-4 family residential properties 170 — — 170 742 912 Commercial and industrial loans — — — — 255 255 Consumer loans 20 — — 20 20 40 Other commercial loans — — — — 147 147 Total $ 462 $ — $ — $ 462 $ 1,756 $ 2,218
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 as of September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 Real Estate Inventory and Receivables Vehicles Miscellaneous Total Loans secured by real estate: Other secured by 1-4 family $ 980 $ — $ — $ — $ 980 Secured by nonfarm, nonresidential 20,973 — — — 20,973 Other loans secured by real estate: Secured by 1-4 family residential 2,822 — — — 2,822 Commercial and industrial loans 38 355 367 8,472 9,232 Other commercial loans — — — 13,371 13,371 Total $ 24,813 $ 355 $ 367 $ 21,843 $ 47,378 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 September 30, 2023 and December 31, 2022 ($ in thousands): Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of September 30, 2023 Commercial LHFI Loans secured by real estate: Construction, land Pass - RR 1 through RR 6 $ 293,087 $ 138,233 $ 51,342 $ 16,250 $ 2,219 $ 2,166 $ 58,294 $ 561,591 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 338 592 — 20 — 23 — 973 Doubtful - RR 9 — — — — — 42 — 42 Total 293,425 138,825 51,342 16,270 2,219 2,231 58,294 562,606 Current period gross — 4 10 — 228 — — 242 Other secured by 1-4 family Pass - RR 1 through RR 6 $ 28,114 $ 32,346 $ 27,894 $ 14,821 $ 8,273 $ 4,298 $ 9,176 $ 124,922 Special Mention - RR 7 — 28 53 12 — — — 93 Substandard - RR 8 704 681 29 61 82 238 99 1,894 Doubtful - RR 9 — 9 — — — — — 9 Total 28,818 33,064 27,976 14,894 8,355 4,536 9,275 126,918 Current period gross — — 23 — — — — 23 Secured by nonfarm, Pass - RR 1 through RR 6 $ 441,919 $ 880,761 $ 599,643 $ 626,109 $ 387,867 $ 387,001 $ 129,632 $ 3,452,932 Special Mention - RR 7 13,235 14,930 25,000 1,147 — — — 54,312 Substandard - RR 8 10,123 1,712 21,914 10,112 8,661 9,748 50 62,320 Doubtful - RR 9 24 — — — 60 14 — 98 Total 465,301 897,403 646,557 637,368 396,588 396,763 129,682 3,569,662 Current period gross — 39 82 — 19 138 — 278 Other real estate secured: Pass - RR 1 through RR 6 $ 102,678 $ 353,814 $ 361,897 $ 268,866 $ 56,340 $ 11,711 $ 11,631 $ 1,166,937 Special Mention - RR 7 126 14,867 — — 35,911 — — 50,904 Substandard - RR 8 — 131 — 294 — 47 — 472 Doubtful - RR 9 42 — — — — — — 42 Total 102,846 368,812 361,897 269,160 92,251 11,758 11,631 1,218,355 Current period gross — — — — — — — — Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of September 30, 2023 Commercial LHFI Other loans secured by real Other construction: Pass - RR 1 through RR 6 $ 175,054 $ 529,544 $ 180,594 $ 68,641 $ — $ — $ 49 $ 953,882 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 63 — — — — — — 63 Doubtful - RR 9 — — — — — — — — Total 175,117 529,544 180,594 68,641 — — 49 953,945 Current period gross 61 3,392 — — — — — 3,453 Commercial and industrial Pass - RR 1 through RR 6 $ 410,007 $ 529,180 $ 181,582 $ 74,467 $ 34,800 $ 46,348 $ 489,700 $ 1,766,084 Special Mention - RR 7 — 7,048 128 7 — — 1,963 9,146 Substandard - RR 8 5,842 4,862 8,265 12,055 154 88 22,238 53,504 Doubtful - RR 9 3 84 38 — — 63 2 190 Total 415,852 541,174 190,013 86,529 34,954 46,499 513,903 1,828,924 Current period gross 28 536 651 138 94 108 7 1,562 State and other political Pass - RR 1 through RR 6 $ 74,824 $ 261,922 $ 182,951 $ 106,513 $ 34,148 $ 390,838 $ 5,373 $ 1,056,569 Special Mention - RR 7 — — — — — — — — Substandard - RR 8 — — — — — — — — Doubtful - RR 9 — — — — — — — — Total 74,824 261,922 182,951 106,513 34,148 390,838 5,373 1,056,569 Current period gross — — — — — — — — Other commercial loans: Pass - RR 1 through RR 6 $ 142,805 $ 35,989 $ 28,920 $ 22,720 $ 33,492 $ 9,638 $ 179,719 $ 453,283 Special Mention - RR 7 — — — — — — 20 20 Substandard - RR 8 106 3,401 48 — — 1,050 10,108 14,713 Doubtful - RR 9 92 — — — — — — 92 Total 143,003 39,390 28,968 22,720 33,492 10,688 189,847 468,108 Current period gross — 6 — 26 — — — 32 Total commercial $ 1,699,186 $ 2,810,134 $ 1,670,298 $ 1,222,095 $ 602,007 $ 863,313 $ 918,054 $ 9,785,087 Total commercial LHFI $ 89 $ 3,977 $ 766 $ 164 $ 341 $ 246 $ 7 $ 5,590 Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of September 30, 2023 Consumer LHFI Loans secured by real estate: Construction, land Current $ 37,611 $ 42,200 $ 7,116 $ 1,754 $ 1,176 $ 2,185 $ 166 $ 92,208 Past due 30-89 days — 313 — — 33 17 — 363 Past due 90 days or more — — — — — — — — Nonaccrual — — 200 — — 4 — 204 Total 37,611 42,513 7,316 1,754 1,209 2,206 166 92,775 Current period gross — — — — — — — — Other secured by 1-4 family Current $ 20,453 $ 13,762 $ 5,905 $ 4,603 $ 4,438 $ 8,965 $ 406,021 $ 464,147 Past due 30-89 days 6 41 58 10 44 522 5,880 6,561 Past due 90 days or more — 6 — — — 67 654 727 Nonaccrual 59 128 60 10 435 482 4,291 5,465 Total 20,518 13,937 6,023 4,623 4,917 10,036 416,846 476,900 Current period gross — 94 5 — 10 17 81 207 Secured by nonfarm, Current $ — $ — $ 9 $ — $ — $ — $ — $ 9 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — — 9 — — — — 9 Current period gross — — — — — — — — Other real estate secured: Current $ — $ — $ — $ 81 $ — $ 63 $ — $ 144 Past due 30-89 days — — — — — — — — Past due 90 days or more — — — — — — — — Nonaccrual — — — — — — — — Total — — — 81 — 63 — 144 Current period gross — — — — — — — — Term Loans by Origination Year 2023 2022 2021 2020 2019 Prior Revolving Loans Total As of September 30, 2023 Consumer LHFI Other loans secured by real Secured by 1-4 family Current $ 242,667 $ 886,235 $ 529,310 $ 183,816 $ 101,283 $ 284,715 $ — $ 2,228,026 Past due 30-89 days 1,458 12,375 6,151 2,270 297 1,996 — 24,547 Past due 90 days or more 246 1,169 938 139 — 65 — 2,557 Nonaccrual 158 9,876 9,480 4,398 2,196 8,550 — 34,658 Total 244,529 909,655 545,879 190,623 103,776 295,326 — 2,289,788 Current period gross 1 562 156 92 — 92 — 903 Consumer loans: Current $ 50,059 $ 39,900 $ 13,199 $ 3,511 $ 1,217 $ 471 $ 54,101 $ 162,458 Past due 30-89 days 683 394 156 1 13 8 1,109 2,364 Past due 90 days or more 29 39 1 2 — — 409 480 Nonaccrual — 113 90 16 — — 35 254 Total 50,771 40,446 13,446 3,530 1,230 479 55,654 165,556 Current period gross 4,389 434 146 41 1 1 1,553 6,565 Total consumer LHFI $ 353,429 $ 1,006,551 $ 572,673 $ 200,611 $ 111,132 $ 308,110 $ 472,666 $ 3,025,172 Total consumer LHFI $ 4,390 $ 1,090 $ 307 $ 133 $ 11 $ 110 $ 1,634 $ 7,675 Total LHFI $ 2,052,615 $ 3,816,685 $ 2,242,971 $ 1,422,706 $ 713,139 $ 1,171,423 $ 1,390,720 $ 12,810,259 Total current period $ 4,479 $ 5,067 $ 1,073 $ 297 $ 352 $ 356 $ 1,641 $ 13,265 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 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 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, 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 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 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 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 $ 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 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 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, 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 Other loans secured by real Secured by 1-4 family 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 Equipment finance leases WARM Southern Unemployment, Southern GDP 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 Other commercial loans Other loans DCF Prime Rate, Southern Unemployment Commercial and industrial - DCF Trustmark historical data Commercial and industrial - DCF Trustmark historical data
Change in Allowance for Loan Losses	The following tables disaggregate the ACL and the amortized cost basis of the loans by the measurement methodology used at September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 ACL LHFI Individually Evaluated for Credit Loss 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 $ — $ 17,241 $ 17,241 $ — 655,381 $ 655,381 Other secured by 1-4 family residential — 12,563 12,563 980 602,838 603,818 Secured by nonfarm, nonresidential — 23,298 23,298 20,973 3,548,698 3,569,671 Other real estate secured — 3,565 3,565 — 1,218,499 1,218,499 Other loans secured by real estate: Other construction — 6,306 6,306 — 953,945 953,945 Secured by 1-4 family residential — 30,144 30,144 2,822 2,286,966 2,289,788 Commercial and industrial loans 9,118 14,637 23,755 9,232 1,819,692 1,828,924 Consumer loans — 5,804 5,804 — 165,556 165,556 State and other political subdivision loans — 665 665 — 1,056,569 1,056,569 Other commercial loans 5,837 4,853 10,690 13,371 454,737 468,108 Total $ 14,955 $ 119,076 $ 134,031 $ 47,378 $ 12,762,881 $ 12,810,259 December 31, 2022 ACL LHFI Individually Evaluated for Credit Loss 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 $ 121 $ 12,707 $ 12,828 $ 1,558 $ 689,058 $ 690,616 Other secured by 1-4 family residential — 12,374 12,374 482 590,308 590,790 Secured by nonfarm, nonresidential — 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 — 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): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Balance at beginning of period $ 129,298 $ 103,140 $ 120,214 $ 99,457 Loans charged-off ( 7,496 ) ( 2,920 ) ( 13,265 ) ( 7,439 ) Recoveries 3,907 1,911 7,305 8,257 Net (charge-offs) recoveries ( 3,589 ) ( 1,009 ) ( 5,960 ) 818 PCL, LHFI 8,322 12,919 19,777 14,775 Balance at end of period $ 134,031 $ 115,050 $ 134,031 $ 115,050 The following tables detail changes in the ACL, LHFI by loan class for the periods presented ($ in thousands): Three Months Ended September 30, 2023 Balance at Beginning of Period Charge-offs Recoveries PCL Balance at Loans secured by real estate: Construction, land development and other land $ 15,343 $ ( 228 ) $ 22 $ 2,104 $ 17,241 Other secured by 1-4 family residential properties 12,173 ( 110 ) 43 457 12,563 Secured by nonfarm, nonresidential properties 20,376 ( 192 ) 2,216 898 23,298 Other real estate secured 3,481 — — 84 3,565 Other loans secured by real estate: Other construction 14,377 ( 3,453 ) 15 ( 4,633 ) 6,306 Secured by 1-4 family residential properties 28,555 ( 448 ) 7 2,030 30,144 Commercial and industrial loans 23,170 ( 635 ) 267 953 23,755 Consumer loans 5,540 ( 2,421 ) 1,337 1,348 5,804 State and other political subdivision loans 676 — — ( 11 ) 665 Other commercial loans 5,607 ( 9 ) — 5,092 10,690 Total $ 129,298 $ ( 7,496 ) $ 3,907 $ 8,322 $ 134,031 The increases in the PCL, LHFI for the three months ended September 30, 2023 were primarily attributable to an individually evaluated and reserved for nonaccrual loan, loan growth, the weakening macroeconomic forecasts and the net adjustment to the qualitative factors. The PCL, LHFI for the other construction portfolio decreased $ 4.6 million during the three months ended September 30, 2023 primarily due to the transfer of a fully-reserved nonaccrual loan to other real estate, net. Three Months Ended September 30, 2022 Balance at Beginning of Period Charge-offs Recoveries PCL Balance at Loans secured by real estate: Construction, land development and other land $ 7,301 $ ( 189 ) $ 43 $ 3,096 $ 10,251 Other secured by 1-4 family residential properties 10,038 ( 33 ) 234 500 10,739 Secured by nonfarm, nonresidential properties 29,735 — 35 ( 3,846 ) 25,924 Other real estate secured 3,297 — 4 97 3,398 Other loans secured by real estate: Other construction 14,397 ( 153 ) 1 ( 326 ) 13,919 Secured by 1-4 family residential properties 12,250 ( 37 ) 125 3,057 15,395 Commercial and industrial loans 14,103 ( 191 ) 111 10,081 24,104 Consumer loans 5,139 ( 458 ) 425 ( 78 ) 5,028 State and other political subdivision loans 1,917 — — ( 323 ) 1,594 Other commercial loans 4,963 ( 1,859 ) 933 661 4,698 Total $ 103,140 $ ( 2,920 ) $ 1,911 $ 12,919 $ 115,050 The increases in the PCL, LHFI for the three months ended September 30, 2022 were primarily due to a less positive outlook in the macroeconomic forecasting, an increase in loan growth and specific reserves for individually analyzed loans. The PCL, LHFI for the secured by nonfarm, nonresidential properties portfolio decreased $ 3.8 million during the three months ended September 30, 2022 primarily due to reductions in the pandemic qualitative factor . Nine Months Ended September 30, 2023 Balance at Beginning of Period Charge-offs Recoveries PCL Balance at Loans secured by real estate: Construction, land development and other land $ 12,828 $ ( 242 ) $ 94 $ 4,561 $ 17,241 Other secured by 1-4 family residential properties 12,374 ( 230 ) 165 254 12,563 Secured by nonfarm, nonresidential properties 19,488 ( 278 ) 2,322 1,766 23,298 Other real estate secured 4,743 — 5 ( 1,183 ) 3,565 Other loans secured by real estate: Other construction 15,132 ( 3,453 ) 63 ( 5,436 ) 6,306 Secured by 1-4 family residential properties 21,185 ( 903 ) 27 9,835 30,144 Commercial and industrial loans 23,140 ( 1,562 ) 754 1,423 23,755 Consumer loans 5,792 ( 6,565 ) 3,875 2,702 5,804 State and other political subdivision loans 885 — — ( 220 ) 665 Other commercial loans 4,647 ( 32 ) — 6,075 10,690 Total $ 120,214 $ ( 13,265 ) $ 7,305 $ 19,777 $ 134,031 The increases in the PCL, LHFI for the nine months ended September 30, 2023 were primarily attributable to loan growth, extended maturities on the secured by 1-4 family residential properties resulting from lower prepayment speeds, the weakening macroeconomic forecast and net adjustments to the qualitative factors. The PCL, LHFI for the other construction portfolio decreased $ 5.4 million during the nine months ended September 30, 2023 primarily due to the transfer of a fully-reserved nonaccrual loan to other real estate, net. The PCL, LHFI for the other real estate secured portfolio decreased $ 1.2 million during the nine months ended September 30, 2023 primarily due to reductions in the pandemic qualitative factor . Nine Months Ended September 30, 2022 Balance at Beginning of Period Charge-offs Recoveries PCL Balance at Loans secured by real estate: Construction, land development and other land $ 6,079 $ ( 223 ) $ 1,230 $ 3,165 $ 10,251 Other secured by 1-4 family residential properties 10,310 ( 95 ) 529 ( 5 ) 10,739 Secured by nonfarm, nonresidential properties 37,912 — 1,536 ( 13,524 ) 25,924 Other real estate secured 4,713 ( 131 ) 11 ( 1,195 ) 3,398 Other loans secured by real estate: Other construction 5,968 ( 153 ) 205 7,899 13,919 Secured by 1-4 family residential properties 2,706 ( 116 ) 135 12,670 15,395 Commercial and industrial loans 18,939 ( 566 ) 414 5,317 24,104 Consumer loans 4,774 ( 1,394 ) 1,256 392 5,028 State and other political subdivision loans 2,708 — — ( 1,114 ) 1,594 Other commercial loans 5,348 ( 4,761 ) 2,941 1,170 4,698 Total $ 99,457 $ ( 7,439 ) $ 8,257 $ 14,775 $ 115,050 The increases in the PCL, LHFI for the nine months ended September 30, 2022 primarily due to loan growth, the nature and volume of the portfolio, and specific reserves for individually analyzed loans. For the nine months ended September 30, 2022, the decreases in the PCL, LHFI for the secured by nonfarm, nonresidential properties and other real estate secured loan portfolios was primarily due to a positive economic outlook and the initial stages of resolution of the External Factor- Pandemic qualitative factor. The decrease in the PCL, LHFI for the state and other political subdivision loans portfolio was due to routine modeling assumption updates.

Mortgage Banking (Tables)

Mortgage Banking (Tables)	9 Months Ended
	Sep. 30, 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): Nine Months Ended September 30, 2023 2022 Balance at beginning of period $ 129,677 $ 87,687 Origination of servicing assets 11,025 14,452 Change in fair value: Due to market changes 8,735 41,529 Due to run-off ( 7,058 ) ( 11,053 ) Balance at end of period $ 142,379 $ 132,615
Schedule of Mortgage Loans Sold and Serviced for Others	The table below details the mortgage loans sold and serviced for others at September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 December 31, 2022 Federal National Mortgage Association $ 4,802,861 $ 4,684,815 Government National Mortgage Association 3,478,965 3,350,222 Federal Home Loan Mortgage Corporation 90,119 52,023 Other 31,440 28,764 Total mortgage loans sold and serviced for others $ 8,403,385 $ 8,115,824

Other Real Estate (Tables)

Other Real Estate (Tables)	9 Months Ended
	Sep. 30, 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): Nine Months Ended September 30, 2023 2022 Balance at beginning of period $ 1,986 $ 4,557 Additions 5,434 1,430 Disposals ( 1,903 ) ( 2,503 ) (Write-downs) recoveries ( 32 ) ( 513 ) Balance at end of period $ 5,485 $ 2,971 Gains (losses), net on the sale of other real estate included in $ ( 159 ) $ ( 465 )
Other Real Estate, by Type of Property	At September 30, 2023 and December 31, 2022, other real estate by type of property consisted of the following ($ in thousands): September 30, 2023 December 31, 2022 1-4 family residential properties $ 902 $ 1,128 Nonfarm, nonresidential properties 4,528 561 Other real estate properties 55 297 Total other real estate $ 5,485 $ 1,986
Other Real Estate, by Geographic Location	At September 30, 2023 and December 31, 2022, other real estate by geographic location consisted of the following ($ in thousands): September 30, 2023 December 31, 2022 Alabama $ 315 $ 194 Mississippi (1) 942 1,769 Tennessee (2) — 23 Texas 4,228 — Total other real estate $ 5,485 $ 1,986 (1) Mississippi includes Central and Southern Mississippi Regions. (2) Tennessee includes Memphis, Tennessee and Northern Mississippi Regions.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2023
Leases [Abstract]
Components of Net Lease Cost	The following table details the components of net lease cost for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Finance leases: Amortization of right-of-use assets $ 113 $ 356 $ 673 $ 1,122 Interest on lease liabilities 41 46 124 143 Operating lease cost 1,372 1,309 3,976 3,877 Short-term lease cost 62 98 218 328 Variable lease cost 208 257 690 891 Sublease income ( 3 ) ( 4 ) ( 9 ) ( 166 ) Net lease cost $ 1,793 $ 2,062 $ 5,672 $ 6,195
Cash Payments Included in Measurement of Lease Liabilities	The following table details the cash payments included in the measurement of lease liabilities during the periods presented ($ in thousands): Nine Months Ended September 30, 2023 2022 Finance leases: Operating cash flows included in operating activities $ 124 $ 143 Financing cash flows included in payments under finance lease obligations 627 1,070 Operating leases: Operating cash flows (fixed payments) included in other operating activities, net 3,430 4,389 Operating cash flows (liability reduction) included in other operating activities, net 2,771 3,075
Balance Sheet Information and Weighted-Average Lease Terms and Discount Rates Related to Leases	The following table details balance sheet information, as well as weighted-average lease terms and discount rates, related to leases at September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 December 31, 2022 Finance lease right-of-use assets, net of accumulated depreciation $ 3,864 $ 4,537 Finance lease liabilities 4,427 5,055 Operating lease right-of-use assets 39,639 36,301 Operating lease liabilities 42,730 38,932 Weighted-average lease term: Finance leases 8.60 years 8.72 years Operating leases 10.15 years 9.64 years Weighted-average discount rate: Finance leases 3.61 % 3.49 % Operating leases 3.63 % 3.22 %
Future Minimum Rental Commitments Under Finance and Operating Leases	At September 30, 2023, future minimum rental commitments under finance and operating leases were as follows ($ in thousands): Finance Leases Operating Leases 2023 (excluding the nine months ended September 30, 2023) $ 133 $ 843 2024 572 5,394 2025 584 5,425 2026 589 5,176 2027 594 4,971 Thereafter 2,685 30,194 Total minimum lease payments 5,157 52,003 Less imputed interest ( 730 ) ( 9,273 ) Lease liabilities $ 4,427 $ 42,730

Deposits (Tables)

Deposits (Tables)	9 Months Ended
	Sep. 30, 2023
Deposits [Abstract]
Deposits Summary	At September 30, 2023 and December 31, 2022, deposits consisted of the following ($ in thousands): September 30, 2023 December 31, 2022 Noninterest-bearing demand $ 3,320,124 $ 4,093,771 Interest-bearing demand 4,835,577 4,773,219 Savings 3,547,547 4,282,435 Time 3,398,675 1,288,223 Total $ 15,101,923 $ 14,437,648

Securities Sold Under Repurch_2

Securities Sold Under Repurchase Agreements (Tables)	9 Months Ended
	Sep. 30, 2023
Securities Sold under Agreements to Repurchase [Abstract]
Schedule of Securities Sold Under Repurchase Agreements	The following table presents the securities sold under repurchase agreements by collateral pledged at September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 December 31, 2022 Mortgage-backed securities Residential mortgage pass-through securities Issued by FNMA and FHLMC $ 42,108 $ 41,732 Other residential mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA 1,294 1,111 Commercial mortgage-backed securities Issued or guaranteed by FNMA, FHLMC or GNMA — 21,277 Total securities sold under repurchase agreements $ 43,402 $ 64,120

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Summary of Noninterest Income Disaggregated by Reportable Operating Segment and Revenue Stream	The following tables present noninterest income disaggregated by reportable operating segment and revenue stream for the periods presented ($ in thousands): Three Months Ended September 30, 2023 Three Months Ended September 30, 2022 Topic 606 Not Topic (1) Total Topic 606 Not Topic (1) Total General Banking Segment Service charges on deposit accounts $ 11,052 $ — $ 11,052 $ 11,296 $ — $ 11,296 Bank card and other fees 7,332 873 8,205 7,644 1,648 9,292 Mortgage banking, net — 6,458 6,458 — 6,876 6,876 Wealth management 202 — 202 263 — 263 Other, net 2,843 ( 579 ) 2,264 1,724 239 1,963 Total noninterest income $ 21,429 $ 6,752 $ 28,181 $ 20,927 $ 8,763 $ 29,690 Wealth Management Segment Service charges on deposit accounts $ 22 $ — $ 22 $ 22 $ — $ 22 Bank card and other fees 12 — 12 13 — 13 Wealth management 8,571 — 8,571 8,515 — 8,515 Other, net 41 94 135 447 10 457 Total noninterest income $ 8,646 $ 94 $ 8,740 $ 8,997 $ 10 $ 9,007 Insurance Segment Insurance commissions $ 15,303 $ — $ 15,303 $ 13,911 $ — $ 13,911 Other, net — — — ( 2 ) — ( 2 ) Total noninterest income $ 15,303 $ — $ 15,303 $ 13,909 $ — $ 13,909 Consolidated Service charges on deposit accounts $ 11,074 $ — $ 11,074 $ 11,318 $ — $ 11,318 Bank card and other fees 7,344 873 8,217 7,657 1,648 9,305 Mortgage banking, net — 6,458 6,458 — 6,876 6,876 Insurance commissions 15,303 — 15,303 13,911 — 13,911 Wealth management 8,773 — 8,773 8,778 — 8,778 Other, net 2,884 ( 485 ) 2,399 2,169 249 2,418 Total noninterest income $ 45,378 $ 6,846 $ 52,224 $ 43,833 $ 8,773 $ 52,606 (1) Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, accretion of the FDIC indemnification asset, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and security gains (losses), net. Nine Months Ended September 30, 2023 Nine Months Ended September 30, 2022 Topic 606 Not Topic (1) Total Topic 606 Not Topic (1) Total General Banking Segment Service charges on deposit accounts $ 32,040 $ — $ 32,040 $ 30,932 $ — $ 30,932 Bank card and other fees 23,011 1,890 24,901 23,726 4,153 27,879 Mortgage banking, net — 20,697 20,697 — 24,898 24,898 Wealth management 650 — 650 468 — 468 Other, net 8,763 ( 1,516 ) 7,247 6,097 896 6,993 Total noninterest income $ 64,464 $ 21,071 $ 85,535 $ 61,223 $ 29,947 $ 91,170 Wealth Management Segment Service charges on deposit accounts $ 65 $ — $ 65 $ 63 $ — $ 63 Bank card and other fees 36 — 36 35 — 35 Wealth management 25,785 — 25,785 26,466 — 26,466 Other, net 122 285 407 512 29 541 Total noninterest income $ 26,008 $ 285 $ 26,293 $ 27,076 $ 29 $ 27,105 Insurance Segment Insurance commissions $ 44,372 $ — $ 44,372 $ 41,702 $ — $ 41,702 Other, net 954 — 954 ( 3 ) — ( 3 ) Total noninterest income $ 45,326 $ — $ 45,326 $ 41,699 $ — $ 41,699 Consolidated Service charges on deposit accounts $ 32,105 $ — $ 32,105 $ 30,995 $ — $ 30,995 Bank card and other fees 23,047 1,890 24,937 23,761 4,153 27,914 Mortgage banking, net — 20,697 20,697 — 24,898 24,898 Insurance commissions 44,372 — 44,372 41,702 — 41,702 Wealth management 26,435 — 26,435 26,934 — 26,934 Other, net 9,839 ( 1,231 ) 8,608 6,606 925 7,531 Total noninterest income $ 135,798 $ 21,356 $ 157,154 $ 129,998 $ 29,976 $ 159,974 (1) Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, accretion of the FDIC indemnification asset, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and security gains (losses), net.

Defined Benefit and Other Pos_2

Defined Benefit and Other Postretirement Benefits (Tables)	9 Months Ended
	Sep. 30, 2023
Trustmark Capital Accumulation Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Periodic Benefit Cost	The following table presents information regarding the net periodic benefit cost for the Continuing Plan for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Service cost $ 13 $ 28 $ 39 $ 86 Interest cost 73 48 219 144 Expected return on plan assets ( 27 ) ( 30 ) ( 80 ) ( 90 ) Recognized net loss due to lump sum settlements — — 25 — Recognized net actuarial loss — 52 — 172 Net periodic benefit cost $ 59 $ 98 $ 203 $ 312
Supplemental Retirement Plan [Member]
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Net Periodic Benefit Cost	The following table presents information regarding the net periodic benefit cost for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Service cost $ 17 $ 18 $ 51 $ 54 Interest cost 497 316 1,515 962 Amortization of prior service cost 28 28 83 83 Recognized net actuarial loss 70 243 216 742 Net periodic benefit cost $ 612 $ 605 $ 1,865 $ 1,841

Stock and Incentive Compensat_2

Stock and Incentive Compensation (Tables)	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Summary of Stock Plan Activity	The following tables summarize the Stock Plan activity for the periods presented: Three Months Ended September 30, 2023 Performance Time-Vested Nonvested units, beginning of period 174,214 364,198 Granted — — Released from restriction — ( 1,500 ) Forfeited — ( 688 ) Nonvested units, end of period 174,214 362,010 Nine Months Ended September 30, 2023 Performance Time-Vested Nonvested units, beginning of period 148,416 312,978 Granted 70,666 145,003 Released from restriction ( 39,943 ) ( 89,041 ) Forfeited ( 4,925 ) ( 6,930 ) Nonvested units, end of period 174,214 362,010
Compensation Expense for Awards and Units Under Stock Plan	The following table presents information regarding compensation expense for units under the Stock Plan for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Performance units $ 449 $ 381 $ 1,181 $ 916 Time-vested units 1,045 848 3,591 2,798 Total compensation expense $ 1,494 $ 1,229 $ 4,772 $ 3,714

Contingencies (Tables)

Contingencies (Tables)	9 Months Ended
	Sep. 30, 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): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Balance at beginning of period $ 34,841 $ 32,949 $ 36,838 $ 35,623 PCL, off-balance sheet credit exposures 104 ( 1,326 ) ( 1,893 ) ( 4,000 ) Balance at end of period $ 34,945 $ 31,623 $ 34,945 $ 31,623

Earnings Per Share (EPS) (Table

Earnings Per Share (EPS) (Tables)	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Weighted-Average Shares Used to Calculate Basic and Diluted EPS	The following table reflects weighted-average shares used to calculate basic and diluted EPS for the periods presented (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Basic shares 61,070 61,115 61,048 61,334 Dilutive shares 193 204 171 186 Diluted shares 61,263 61,319 61,219 61,520
Weighted-Average Antidilutive Stock Awards Excluded from Determining Diluted EPS	Weighted-average antidilutive stock awards were excluded in determining diluted EPS. The following table reflects weighted-average antidilutive stock awards for the periods presented (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Weighted-average antidilutive stock awards 23 — 75 —

Statements of Cash Flows (Table

Statements of Cash Flows (Tables)	9 Months Ended
	Sep. 30, 2023
Supplemental Cash Flow Information [Abstract]
Cash Flows Supplementary Disclosures	The following table reflects specific transaction amounts for the periods presented ($ in thousands): Nine Months Ended September 30, 2023 2022 Income taxes paid $ 34,898 $ 1,241 Interest expense paid on deposits and borrowings 214,745 17,077 Noncash transfers from loans to other real estate 5,434 1,430 Operating right-of-use assets resulting from lease liabilities 7,092 6,572

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2023 and December 31, 2022 ($ in thousands): Actual Regulatory Capital Minimum To Be Well Amount Ratio Requirement Capitalized At September 30, 2023: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,498,217 9.89 % 7.00 % n/a Trustmark National Bank 1,579,132 10.43 % 7.00 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,558,217 10.29 % 8.50 % n/a Trustmark National Bank 1,579,132 10.43 % 8.50 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,834,295 12.11 % 10.50 % n/a Trustmark National Bank 1,731,783 11.44 % 10.50 % 10.00 % Tier 1 Leverage (to Average Assets) Trustmark Corporation $ 1,558,217 8.49 % 4.00 % n/a Trustmark National Bank 1,579,132 8.63 % 4.00 % 5.00 % At December 31, 2022: Common Equity Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,413,672 9.74 % 7.00 % n/a Trustmark National Bank 1,501,889 10.34 % 7.00 % 6.50 % Tier 1 Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,473,672 10.15 % 8.50 % n/a Trustmark National Bank 1,501,889 10.34 % 8.50 % 8.00 % Total Capital (to Risk Weighted Assets) Trustmark Corporation $ 1,729,499 11.91 % 10.50 % n/a Trustmark National Bank 1,634,454 11.26 % 10.50 % 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	The following tables present the net change in the components of accumulated other comprehensive income (loss) and the related tax effects allocated to each component for the periods presented ($ in thousands). Nine Months Ended September 30, 2023 Nine Months Ended September 30, 2022 Before Tax Tax (Expense) Net of Tax Before Tax Tax (Expense) Net of Tax Securities available for sale and transferred securities: Net unrealized holding gains (losses) arising $ ( 16,062 ) $ 4,246 $ ( 11,816 ) $ ( 314,517 ) $ 78,630 $ ( 235,887 ) Change in net unrealized holding loss on 11,799 ( 2,950 ) 8,849 ( 31,451 ) 7,863 ( 23,588 ) Total securities available for sale ( 4,263 ) 1,296 ( 2,967 ) ( 345,968 ) 86,493 ( 259,475 ) Pension and other postretirement benefit plans: Reclassification adjustments for changes Net change in prior service costs 83 ( 21 ) 62 83 ( 21 ) 62 Recognized net loss due to lump sum 25 ( 6 ) 19 — — — Change in net actuarial loss 216 ( 54 ) 162 914 ( 228 ) 686 Total pension and other postretirement 324 ( 81 ) 243 997 ( 249 ) 748 Cash flow hedge derivatives: Change in accumulated gain (loss) on effective ( 24,569 ) 6,142 ( 18,427 ) ( 19,524 ) 4,881 ( 14,643 ) Reclassification adjustment for (gain) loss realized 11,555 ( 2,889 ) 8,666 ( 643 ) 161 ( 482 ) Total cash flow hedge derivatives ( 13,014 ) 3,253 ( 9,761 ) ( 20,167 ) 5,042 ( 15,125 ) Total other comprehensive income (loss) $ ( 16,953 ) $ 4,468 $ ( 12,485 ) $ ( 365,138 ) $ 91,286 $ ( 273,852 )
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 Defined Cash Flow Total Balance at January 1, 2023 $ ( 254,442 ) $ ( 5,792 ) $ ( 15,169 ) $ ( 275,403 ) Other comprehensive income (loss) before reclassification ( 2,967 ) — ( 18,427 ) ( 21,394 ) Amounts reclassified from accumulated other — 243 8,666 8,909 Net other comprehensive income (loss) ( 2,967 ) 243 ( 9,761 ) ( 12,485 ) Balance at September 30, 2023 $ ( 257,409 ) $ ( 5,549 ) $ ( 24,930 ) $ ( 287,888 ) Balance at January 1, 2022 $ ( 17,774 ) $ ( 14,786 ) $ — $ ( 32,560 ) Other comprehensive income (loss) before reclassification ( 259,475 ) — ( 14,643 ) ( 274,118 ) Amounts reclassified from accumulated other — 748 ( 482 ) 266 Net other comprehensive income (loss) ( 259,475 ) 748 ( 15,125 ) ( 273,852 ) Balance at September 30, 2022 $ ( 277,249 ) $ ( 14,038 ) $ ( 15,125 ) $ ( 306,412 )

Fair Value (Tables)

Fair Value (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2023 and December 31, 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 nine months ended September 30, 2023 and the year ended December 31, 2022. September 30, 2023 Total Level 1 Level 2 Level 3 U.S. Treasury securities $ 363,476 $ 363,476 $ — $ — U.S. Government agency obligations 6,780 — 6,780 — Obligations of states and political subdivisions 4,642 — 4,642 — Mortgage-backed securities 1,391,276 — 1,391,276 — Securities available for sale 1,766,174 363,476 1,402,698 — LHFS 169,244 — 169,244 — MSR 142,379 — — 142,379 Other assets - derivatives 16,846 8 16,641 197 Other liabilities - derivatives 56,135 3,327 52,808 — 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 nine months ended September 30, 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) 1,677 1,672 Additions 11,025 — Sales — ( 1,632 ) Balance, September 30, 2023 $ 142,379 $ 197 The amount of total gains (losses) for the period included in earnings $ 8,734 $ 559 Balance, January 1, 2022 $ 87,687 $ 1,859 Total net (loss) gain included in Mortgage banking, net (1) 30,476 ( 401 ) Additions 14,452 — Sales — ( 2,326 ) Balance, September 30, 2022 $ 132,615 $ ( 868 ) The amount of total gains (losses) for the period included in $ 41,530 $ ( 1,181 ) (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 September 30, 2023 and December 31, 2022, are as follows ($ in thousands): September 30, 2023 December 31, 2022 Carrying Estimated Carrying Estimated Financial Assets: Level 2 Inputs: Cash and short-term investments $ 750,492 $ 750,492 $ 738,787 $ 738,787 Securities held to maturity 1,438,287 1,312,871 1,494,514 1,406,589 Level 3 Inputs: Net LHFI 12,676,228 12,505,990 12,083,825 11,850,318 Financial Liabilities: Level 2 Inputs: Deposits 15,101,923 15,076,677 14,437,648 14,404,661 Federal funds purchased and securities sold under 321,799 321,799 449,331 449,331 Other borrowings 793,193 793,188 1,050,938 1,050,932 Subordinated notes 123,427 103,750 123,262 113,125 Junior subordinated debt securities 61,856 45,928 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 LHFS accounted for under the fair value option at September 30, 2023 and December 31, 2022 ($ in thousands): September 30, 2023 December 31, 2022 Fair value of LHFS $ 105,542 $ 64,421 LHFS contractual principal outstanding 105,618 63,427 Fair value less unpaid principal $ ( 76 ) $ 994

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 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 September 30, 2023 and December 31, 2022 as well as the effect of these derivative instruments on Trustmark’s results of operations for the periods presented ($ in thousands): September 30, 2023 December 31, 2022 Derivatives in hedging relationships: Interest rate contracts: Interest rate floors included in other assets $ 203 $ — Interest rate swaps included in other liabilities (1) 2,302 761 Derivatives not designated as hedging instruments: Interest rate contracts: Exchange traded purchased options included in other assets $ 8 $ 38 OTC written options (rate locks) included in other assets 197 157 Futures contracts included in other assets — 16 Interest rate swaps included in other assets (1) 16,437 8,654 Credit risk participation agreements included in other assets 1 6 Futures contracts included in other liabilities 2,764 268 Forward contracts included in other liabilities ( 1,479 ) ( 168 ) Exchange traded written options included in other liabilities 563 206 Interest rate swaps included in other liabilities (1) 51,953 44,304 Credit risk participation agreements included in other liabilities 32 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	Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Derivatives in hedging relationships: Amount of gain (loss) reclassified from accumulated other $ ( 4,627 ) $ 643 $ ( 11,555 ) $ 643 Derivatives not designated as hedging instruments: Amount of gain (loss) recognized in mortgage banking, net $ ( 7,634 ) $ ( 8,405 ) $ ( 11,526 ) $ ( 39,181 ) Amount of gain (loss) recognized in bank card and other fees 381 63 571 385
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]	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): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Derivatives in cash flow hedging relationship Amount of gain (loss) recognized in other comprehensive $ ( 8,504 ) $ ( 14,643 ) $ ( 18,427 ) $ ( 14,643 )
Information about Financial Instruments that are Eligible for Offset in the Consolidated Balance Sheets	Information about financial instruments that are eligible for offset in the consolidated balance sheets as of September 30, 2023 and December 31, 2022 is presented in the following tables ($ in thousands): Offsetting of Derivative Assets As of September 30, 2023 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts of Financial Cash Collateral Net Amount Derivatives $ 16,640 $ — $ 16,640 $ ( 2,618 ) $ ( 6,230 ) $ 7,792 Offsetting of Derivative Liabilities As of September 30, 2023 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts of Financial Cash Collateral Net Amount Derivatives $ 54,255 $ — $ 54,255 $ ( 2,618 ) $ ( 40 ) $ 51,597 Offsetting of Derivative Assets As of December 31, 2022 Gross Amounts Not Offset in the Gross Gross Amounts Net Amounts 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)	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Schedule of Segment Information	The following table discloses financial information by reportable segment for the periods presented ($ in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 General Banking Net interest income $ 137,145 $ 134,842 $ 411,682 $ 344,185 Provision for credit losses 10,646 11,595 20,015 10,785 Noninterest income 28,181 29,690 85,535 91,170 Noninterest expense 122,045 108,740 345,329 318,425 Income before income taxes 32,635 44,197 131,873 106,145 Income taxes 5,245 6,396 19,024 14,571 General banking net income $ 27,390 $ 37,801 $ 112,849 $ 91,574 Selected Financial Information Total assets $ 18,099,301 $ 16,897,083 $ 18,099,301 $ 16,897,083 Depreciation and amortization $ 9,483 $ 9,439 $ 25,496 $ 29,610 Wealth Management Net interest income $ 1,494 $ 1,266 $ 4,462 $ 3,948 Provision for credit losses ( 2,220 ) ( 2 ) ( 2,131 ) ( 10 ) Noninterest income 8,740 9,007 26,293 27,105 Noninterest expense 8,281 8,224 24,276 24,637 Income before income taxes 4,173 2,051 8,610 6,426 Income taxes 1,043 515 2,153 1,609 Wealth management net income $ 3,130 $ 1,536 $ 6,457 $ 4,817 Selected Financial Information Total assets $ 194,837 $ 205,873 $ 194,837 $ 205,873 Depreciation and amortization $ 63 $ 71 $ 199 $ 217 Insurance Net interest income $ ( 2 ) $ ( 3 ) $ ( 8 ) $ ( 8 ) Noninterest income 15,303 13,909 45,326 41,699 Noninterest expense 10,619 9,734 31,885 28,922 Income before income taxes 4,682 4,172 13,433 12,769 Income taxes 1,173 1,054 3,373 3,210 Insurance net income $ 3,509 $ 3,118 $ 10,060 $ 9,559 Selected Financial Information Total assets $ 96,701 $ 87,678 $ 96,701 $ 87,678 Depreciation and amortization $ 135 $ 159 $ 434 $ 527 Consolidated Net interest income $ 138,637 $ 136,105 $ 416,136 $ 348,125 Provision for credit losses 8,426 11,593 17,884 10,775 Noninterest income 52,224 52,606 157,154 159,974 Noninterest expense 140,945 126,698 401,490 371,984 Income before income taxes 41,490 50,420 153,916 125,340 Income taxes 7,461 7,965 24,550 19,390 Consolidated net income $ 34,029 $ 42,455 $ 129,366 $ 105,950 Selected Financial Information Total assets $ 18,390,839 $ 17,190,634 $ 18,390,839 $ 17,190,634 Depreciation and amortization $ 9,681 $ 9,669 $ 26,129 $ 30,354

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	Sep. 30, 2023	Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	$ 2,028,863	$ 2,270,709
Securities Available for Sale, Gross Unrealized Gains	3	380
Securities Available for Sale, Gross Unrealized (Losses)	(262,692)	(247,007)
Debt Securities, Available-for-sale	1,766,174	2,024,082
Securities Held to Maturity, Amortized Cost	1,438,287	1,494,514
Securities Held to Maturity, Gross Unrealized Gains	3	37
Securities Held to Maturity, Gross Unrealized (Losses)	(125,419)	(87,962)
Securities Held to Maturity, Estimated Fair Value	1,312,871	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	396,070	425,719
Securities Available for Sale, Gross Unrealized Gains	0	308
Securities Available for Sale, Gross Unrealized (Losses)	(32,594)	(34,514)
Debt Securities, Available-for-sale	363,476	391,513
Securities Held to Maturity, Amortized Cost	28,872	28,295
Securities Held to Maturity, Gross Unrealized Gains	1	0
Securities Held to Maturity, Gross Unrealized (Losses)	(987)	(115)
Securities Held to Maturity, Estimated Fair Value	27,886	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	7,309	8,297
Securities Available for Sale, Gross Unrealized Gains	0	0
Securities Available for Sale, Gross Unrealized (Losses)	(529)	(531)
Debt Securities, Available-for-sale	6,780	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	4,771	4,820
Securities Available for Sale, Gross Unrealized Gains	0	53
Securities Available for Sale, Gross Unrealized (Losses)	(129)	(11)
Debt Securities, Available-for-sale	4,642	4,862
Securities Held to Maturity, Amortized Cost	341	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	341	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	27,009	30,534
Securities Available for Sale, Gross Unrealized Gains	0	7
Securities Available for Sale, Gross Unrealized (Losses)	(4,128)	(3,444)
Debt Securities, Available-for-sale	22,881	27,097
Securities Held to Maturity, Amortized Cost	13,090	4,442
Securities Held to Maturity, Gross Unrealized Gains	0	0
Securities Held to Maturity, Gross Unrealized (Losses)	(1,083)	(395)
Securities Held to Maturity, Estimated Fair Value	12,007	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	1,386,253	1,541,570
Securities Available for Sale, Gross Unrealized Gains	3	12
Securities Available for Sale, Gross Unrealized (Losses)	(214,735)	(196,119)
Debt Securities, Available-for-sale	1,171,521	1,345,463
Securities Held to Maturity, Amortized Cost	474,003	509,311
Securities Held to Maturity, Gross Unrealized Gains	1	0
Securities Held to Maturity, Gross Unrealized (Losses)	(36,482)	(19,586)
Securities Held to Maturity, Estimated Fair Value	437,522	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	98,610	123,755
Securities Available for Sale, Gross Unrealized Gains	0	0
Securities Available for Sale, Gross Unrealized (Losses)	(8,208)	(8,615)
Debt Securities, Available-for-sale	90,402	115,140
Securities Held to Maturity, Amortized Cost	162,031	188,201
Securities Held to Maturity, Gross Unrealized Gains	0	0
Securities Held to Maturity, Gross Unrealized (Losses)	(14,474)	(13,826)
Securities Held to Maturity, Estimated Fair Value	147,557	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	108,841	136,014
Securities Available for Sale, Gross Unrealized Gains	0	0
Securities Available for Sale, Gross Unrealized (Losses)	(2,369)	(3,773)
Debt Securities, Available-for-sale	106,472	132,241
Securities Held to Maturity, Amortized Cost	759,950	759,755
Securities Held to Maturity, Gross Unrealized Gains	1	34
Securities Held to Maturity, Gross Unrealized (Losses)	(72,393)	(54,037)
Securities Held to Maturity, Estimated Fair Value	$ 687,558	$ 705,752

Securities Available for Sale_4

Securities Available for Sale and Held to Maturity - Additional Information (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	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	$ 60,400,000		69,200,000
Credit loss recognized	0		0
Potential credit loss exposure	341,000,000		4,500,000
Securities held to maturity	1,438,287,000		1,494,514,000
Realized gains or losses on security	0	$ 0
Pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law	2,389,000,000		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	3,600,000		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	Sep. 30, 2023	Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	$ 1,438,287	$ 1,494,514
Aaa [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	1,437,946	1,490,004
Aaa1 to Aa3 [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	0	3,001
Not Rated [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss	$ 341	$ 1,509

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	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	$ 886,544	$ 2,078,165
Estimated Fair Value, 12 Months or More	2,187,629	1,342,186
Estimated Fair Value, Total	3,074,173	3,420,351
Gross Unrealized (Losses), Less than 12 Months	(63,993)	(130,121)
Gross Unrealized (Losses), 12 Months or More	(324,118)	(204,848)
Gross Unrealized (Losses), Total	(388,111)	(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	70,893	161,298
Estimated Fair Value, 12 Months or More	320,470	258,087
Estimated Fair Value, Total	391,363	419,385
Gross Unrealized (Losses), Less than 12 Months	(2,494)	(5,655)
Gross Unrealized (Losses), 12 Months or More	(31,087)	(28,974)
Gross Unrealized (Losses), Total	(33,581)	(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	6,742	5,938
Estimated Fair Value, Total	6,742	7,766
Gross Unrealized (Losses), Less than 12 Months	0	(184)
Gross Unrealized (Losses), 12 Months or More	(529)	(347)
Gross Unrealized (Losses), Total	(529)	(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	4,642	1,017
Estimated Fair Value, 12 Months or More	0	3,664
Estimated Fair Value, Total	4,642	4,681
Gross Unrealized (Losses), Less than 12 Months	(129)	(11)
Gross Unrealized (Losses), 12 Months or More	0	(3)
Gross Unrealized (Losses), Total	(129)	(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	9,998	27,223
Estimated Fair Value, 12 Months or More	24,768	3,577
Estimated Fair Value, Total	34,766	30,800
Gross Unrealized (Losses), Less than 12 Months	(652)	(3,270)
Gross Unrealized (Losses), 12 Months or More	(4,559)	(569)
Gross Unrealized (Losses), Total	(5,211)	(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	300,761	770,865
Estimated Fair Value, 12 Months or More	1,304,006	1,062,041
Estimated Fair Value, Total	1,604,767	1,832,906
Gross Unrealized (Losses), Less than 12 Months	(15,670)	(41,807)
Gross Unrealized (Losses), 12 Months or More	(235,547)	(173,898)
Gross Unrealized (Losses), Total	(251,217)	(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	8,264	281,964
Estimated Fair Value, 12 Months or More	229,599	7,235
Estimated Fair Value, Total	237,863	289,199
Gross Unrealized (Losses), Less than 12 Months	314	(21,452)
Gross Unrealized (Losses), 12 Months or More	22,368	(989)
Gross Unrealized (Losses), Total	22,682	(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	491,986	833,970
Estimated Fair Value, 12 Months or More	302,044	1,644
Estimated Fair Value, Total	794,030	835,614
Gross Unrealized (Losses), Less than 12 Months	(44,734)	(57,742)
Gross Unrealized (Losses), 12 Months or More	(30,028)	(68)
Gross Unrealized (Losses), Total	$ (74,762)	$ (57,810)

Securities Available for Sale_7

Securities Available for Sale and Held to Maturity - Contractual Maturities of Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities Available for Sale, Amortized Cost [Abstract]
Due in one year or less	$ 51,084
Due after one year through five years	346,269
Due after five years through ten years	6,188
Due after ten years	4,609
Total amortized cost, before mortgage-backed securities	408,150
Mortgage-backed securities	1,620,713
Securities Available for Sale, Amortized Cost	2,028,863	$ 2,270,709
Securities Available for Sale, Estimated Fair Value [Abstract]
Due in one year or less	49,189
Due after one year through five years	315,552
Due after five years through ten years	5,794
Due after ten years	4,363
Total fair value, before mortgage-backed securities	374,898
Mortgage-backed securities	1,391,276
Total	1,766,174	2,024,082
Securities Held to Maturity, Amortized Cost [Abstract]
Due in one year or less	341
Due after one year through five years	28,872
Due after five years through ten years	0
Due after ten years	0
Total amortized cost, before mortgage-backed securities	29,213
Mortgage-backed securities	1,409,074
Securities Held to Maturity, Amortized Cost	1,438,287	1,494,514
Securities Held to Maturity, Estimated Fair Value [Abstract]
Due in one year or less	341
Due after one year through five years	27,886
Due after five years through ten years	0
Due after ten years	0
Total fair value, before mortgage-backed securities	28,227
Mortgage-backed securities	1,284,644
Total	$ 1,312,871	$ 1,406,589

LHFI and ACL, LHFI - Loan Portf

LHFI and ACL, LHFI - Loan Portfolio Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Loan Portfolio [Abstract]
Total LHFI	$ 12,810,259		$ 12,204,039
Less ACL, LHFI	134,031	$ 129,298	120,214	$ 115,050	$ 103,140	$ 99,457
Net LHFI	12,676,228		12,083,825
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	655,381		690,616
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	603,818		590,790
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	2,289,788		2,185,057
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	1,218,499		742,538
Other Construction [Member] | Other Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	953,945		1,028,926
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	3,569,671		3,278,830
Less ACL, LHFI	23,298	20,376	19,488	25,924	29,735	37,912
Commercial and Industrial Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	1,828,924		1,821,259
Less ACL, LHFI	23,755	23,170	23,140	24,104	14,103	18,939
Consumer Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	165,556		170,230
Less ACL, LHFI	5,804	5,540	5,792	5,028	5,139	4,774
State and Other Political Subdivision Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	1,056,569		1,223,863
Less ACL, LHFI	665	676	885	1,594	1,917	2,708
Other Commercial Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	468,108		471,930
Less ACL, LHFI	$ 10,690	$ 5,607	$ 4,647	$ 4,698	$ 4,963	$ 5,348

LHFI and ACL, LHFI - Additional

LHFI and ACL, LHFI - Additional Information (Details 1) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) Region	Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Accrued interest receivable | $	$ 64.3	$ 50.7
Maximum concentration of loan as a percentage of total LHFI	10%
Key market regions | Region	5

LHFI and ACL, LHFI - Schedule o

LHFI and ACL, LHFI - Schedule of Amortized Cost Basis of Loans on Nonaccrual Status (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	$ 24,862	$ 21,094
Total Nonaccrual	90,899	65,972
Loans Past Due 90 Days or More Still Accruing	3,804	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		137
Total Nonaccrual	1,190	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	3,801	482
Total Nonaccrual	6,339	3,957
Loans Past Due 90 Days or More Still Accruing	727	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	20,973	4,841
Total Nonaccrual	24,009	6,957
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	111	231
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	63	7,620
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	0	1,193
Total Nonaccrual	34,655	19,775
Loans Past Due 90 Days or More Still Accruing	2,558	3,118
Commercial and Industrial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL	88	14,441
Total Nonaccrual	10,575	25,102
Loans Past Due 90 Days or More Still Accruing	39
Consumer Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total Nonaccrual	254	181
Loans Past Due 90 Days or More Still Accruing	480	277
Other Commercial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Nonaccrual With No ACL		0
Total Nonaccrual	$ 13,703	$ 247

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	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	$ 12,810,259	$ 12,204,039
Total LHFI	12,810,259	12,204,039
Past Due 30 to 59 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	33,927	22,700
Past Due 60 to 89 Days [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	15,100	6,887
Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	21,807	29,005
Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	70,834	58,592
Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	12,739,425	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)	655,381	690,616
Total LHFI	655,381	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)	481	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)	241	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)	508	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)	1,230	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)	654,151	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)	603,818	590,790
Total LHFI	603,818	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)	6,527	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)	1,460	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)	2,007	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)	9,994	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)	593,824	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)	2,289,788	2,185,057
Total LHFI	2,289,788	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)	17,157	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)	11,471	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)	16,575	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)	45,203	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)	2,244,585	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)	3,569,671	3,278,830
Total LHFI	3,569,671	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)	1,120	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)	57	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)	1,155	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)	2,332	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)	3,567,339	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)	1,218,499	742,538
Total LHFI	1,218,499	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)	224	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)	42	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)	266	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)	1,218,233	742,377
Commercial and Industrial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,828,924	1,821,259
Total LHFI	1,828,924	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)	5,413	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)	1,156	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)	1,040	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)	7,609	11,448
Commercial and Industrial Loans [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,821,315	1,809,811
Other Construction [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Total LHFI	953,945	1,028,926
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)		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)		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)	953,945	1,021,306
Consumer Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	165,556	170,230
Total LHFI	165,556	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)	1,731	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)	688	645
Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	480	279
Consumer Loans [Member] | Financial Asset, Past Due [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	2,899	3,123
Consumer Loans [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	162,657	167,107
State and Other Political Subdivision Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,056,569	1,223,863
Total LHFI	1,056,569	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)	110	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
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
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)	110	431
State and Other Political Subdivision Loans [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	1,056,459	1,223,432
Other Commercial Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	468,108	471,930
Total LHFI	468,108	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)	1,164	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)	27	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)	1,191	854
Other Commercial Loans [Member] | Current Loans
Financing Receivable Allowance For Credit Losses [Line Items]
Loans held for investment (LHFI)	$ 466,917	$ 471,076

LHFI and ACL, LHFI - Impact of

LHFI and ACL, LHFI - Impact of Modifications Classified as Troubled Debt Restructurings (Details) - Troubled Debt Restructurings [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Financing Receivable Modifications [Line Items]
Amortized Cost Basis	$ 442	$ 1,847
% of Total Class of Loan	0%	0.02%
Pre-Modification Outstanding Recorded Investment	$ 0	$ 371
Post-Modification Outstanding Recorded Investment	442	2,218
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Amortized Cost Basis	$ 96	$ 494
% of Total Class of Loan	0.02%	0.08%
Post-Modification Outstanding Recorded Investment	$ 96	$ 494
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Amortized Cost Basis		$ 370
% of Total Class of Loan		0.01%
Post-Modification Outstanding Recorded Investment		$ 370
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Amortized Cost Basis	$ 346	$ 912
% of Total Class of Loan	0.02%	0.04%
Post-Modification Outstanding Recorded Investment	$ 346	$ 912
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
% of Total Class of Loan		0.01%
Pre-Modification Outstanding Recorded Investment		$ 255
Post-Modification Outstanding Recorded Investment		255
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Amortized Cost Basis		$ 40
% of Total Class of Loan		0.02%
Post-Modification Outstanding Recorded Investment		$ 40
Other Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Amortized Cost Basis		$ 31
% of Total Class of Loan		0.03%
Pre-Modification Outstanding Recorded Investment		$ 116
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]	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [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 Modifications [Line Items]
Term Extension - Financial Effect	Extended amortization on loans with term adjusted by weighted-average 10.6 years	Extended amortization with term adjusted by weighted-average 3.2 years
Weighted average amortization period	10 years 7 months 6 days	3 years 2 months 12 days
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Term Extension - Financial Effect	Modified lines of credit to amortize over 12 month and 24 month terms	Modifed lines of credit to amortize over 12 month and 24 month terms
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Term Extension - Payment Concessions		Six month payment deferrals
Consumer Loans [Member]
Financing Receivable Modifications [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 [Member]
Financing Receivable Modifications [Line Items]
Term Extension - Financial Effect		One loan renewed and extended maturity by seven months
Term Extension - Payment Concessions		Six month payment deferral

LHFI and ACL, LHFI - Troubled_2

LHFI and ACL, LHFI - Troubled Debt Restructuring Subsequently Defaulted (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Troubled Debt Restructurings [Member] | Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Recorded Investment	$ 108

LHFI and ACL, LHFI - Troubled_3

LHFI and ACL, LHFI - Troubled Debt Restructuring Related to Loans Held for Investment, Excluding Covered Loans, by Loan Type (Details) - Troubled Debt Restructurings [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Financing Receivable Modifications [Line Items]
Total	$ 442	$ 2,218
Past Due 30 to 59 Days [Member]
Financing Receivable Modifications [Line Items]
Total	0	462
Past Due 60 to 89 Days [Member]
Financing Receivable Modifications [Line Items]
Total	0	0
Past Due
Financing Receivable Modifications [Line Items]
Total	0	462
Current Loans
Financing Receivable Modifications [Line Items]
Total	442	1,756
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Total	96	494
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Modifications [Line Items]
Total	0	272
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	0	0
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due
Financing Receivable Modifications [Line Items]
Total	0	272
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Current Loans
Financing Receivable Modifications [Line Items]
Total	96	222
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Total		370
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Current Loans
Financing Receivable Modifications [Line Items]
Total		370
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Total	346	912
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Modifications [Line Items]
Total		170
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due
Financing Receivable Modifications [Line Items]
Total		170
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Current Loans
Financing Receivable Modifications [Line Items]
Total	$ 346	742
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Total		255
Commercial and Industrial Loans [Member] | Current Loans
Financing Receivable Modifications [Line Items]
Total		255
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Total		40
Consumer Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable Modifications [Line Items]
Total		20
Consumer Loans [Member] | Past Due
Financing Receivable Modifications [Line Items]
Total		20
Consumer Loans [Member] | Current Loans
Financing Receivable Modifications [Line Items]
Total		20
Other Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Total		147
Other Commercial Loans [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	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	$ 47,378	$ 40,288
Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	24,813	15,734
Inventory and Receivables [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	355	233
Vehicles [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	367	395
Miscellaneous [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	21,843	23,926
Construction, Land Development and Other Land [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		1,558
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		1,558
Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	980	482
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	980	482
Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	20,973	4,841
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	20,973	4,841
Other Construction [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		7,620
Other Construction [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans		7,620
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	2,822	1,193
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	2,822	1,193
Commercial and Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	9,232	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	355	233
Commercial and Industrial Loans [Member] | Vehicles [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	367	395
Commercial and Industrial Loans [Member] | Miscellaneous [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	8,472	$ 23,926
Other Commercial Loans [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	13,371
Other Commercial Loans [Member] | Miscellaneous [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	$ 13,371

LHFI and ACL, LHFI - Addition_2

LHFI and ACL, LHFI - Additional Information (Details 2)	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2023	Sep. 30, 2023 USD ($) KeyRatio	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Financing Receivable Recorded Investment [Line Items]
Number of days used as baseline in evaluating collateral documentation exceptions for loan policy				90 days
Number of key quality ratios | KeyRatio				6
Exposure for commercial non accrual loans to be reviewed on individual basis	$ 500,000			$ 500,000
Exposure for commercial accrual loans deemed to be reviewed on individual basis	500,000			500,000
LHFS past due 90 days or more	42,500			42,500		$ 49,300,000
Percentage of outstanding principal to be repurchased under GNMA optional repurchase program			100%
Financing Receivable [Abstract]
PCL	8,322,000	$ 12,919,000		19,777,000	$ 14,775,000
Other Real Estate Secured [Member]
Financing Receivable [Abstract]
PCL				1,200,000
Other Construction [Member]
Financing Receivable [Abstract]
PCL				5,400,000
Other Commercial Loans [Member]
Financing Receivable [Abstract]
PCL	5,092,000	$ 661,000		6,075,000	$ 1,170,000
Minimum [Member]
Financing Receivable [Abstract]
Credit amount used as baseline in evaluating loan policy	$ 100,000			$ 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	Sep. 30, 2023	Dec. 31, 2022
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	$ 2,052,615	$ 4,259,096
Term Loans by Origination Year, Before Latest Fiscal Year	3,816,685	2,453,559
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	2,242,971	1,652,970
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,422,706	824,439
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	713,139	354,522
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	1,171,423	1,110,471
Financing Receivable, Revolving Loans	1,390,720	1,548,982
Total LHFI	12,810,259	12,204,039
Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	21,807	29,005
Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	1,828,924	1,821,259
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	1,040	8,974
State and Other Political Subdivision Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	1,056,569	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
Other Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	468,108	471,930
Other Commercial Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI		24
Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	165,556	170,230
Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	480	279
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	655,381	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	603,818	590,790
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	1,218,499	742,538
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	3,569,671	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	1,155	794
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Total LHFI	953,945	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	2,289,788	2,185,057
Commercial LHFI [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	1,699,186	3,152,466
Term Loans by Origination Year, Before Latest Fiscal Year	2,810,134	1,817,851
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	1,670,298	1,430,035
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,222,095	703,273
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	602,007	265,157
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	863,313	828,918
Financing Receivable, Revolving Loans	918,054	1,081,499
Total LHFI	9,785,087	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	415,852	681,061
Term Loans by Origination Year, Before Latest Fiscal Year	541,174	271,860
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	190,013	134,724
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	86,529	45,310
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	34,954	14,374
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	46,499	69,078
Financing Receivable, Revolving Loans	513,903	604,852
Total LHFI	1,828,924	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	410,007	673,848
Term Loans by Origination Year, Before Latest Fiscal Year	529,180	261,962
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	181,582	120,123
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	74,467	44,994
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	34,800	14,265
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	46,348	69,078
Financing Receivable, Revolving Loans	489,700	577,749
Total LHFI	1,766,084	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, Before Latest Fiscal Year	7,048
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	128	12,421
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	7
Financing Receivable, Revolving Loans	1,963	6,454
Total LHFI	9,146	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	5,842	6,973
Term Loans by Origination Year, Before Latest Fiscal Year	4,862	9,845
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	8,265	2,170
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	12,055	312
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	154	74
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	88
Financing Receivable, Revolving Loans	22,238	20,625
Total LHFI	53,504	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	3	240
Term Loans by Origination Year, Before Latest Fiscal Year	84	53
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	38	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	63
Financing Receivable, Revolving Loans	2	24
Total LHFI	190	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	74,824	393,345
Term Loans by Origination Year, Before Latest Fiscal Year	261,922	223,302
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	182,951	123,350
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	106,513	39,031
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	34,148	18,876
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	390,838	424,288
Financing Receivable, Revolving Loans	5,373	1,671
Total LHFI	1,056,569	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	74,824	393,345
Term Loans by Origination Year, Before Latest Fiscal Year	261,922	223,302
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	182,951	123,350
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	106,513	39,031
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	34,148	18,876
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	390,838	421,588
Financing Receivable, Revolving Loans	5,373	1,671
Total LHFI	1,056,569	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	143,003	93,394
Term Loans by Origination Year, Before Latest Fiscal Year	39,390	40,104
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	28,968	28,239
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	22,720	37,607
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	33,492	6,440
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	10,688	11,963
Financing Receivable, Revolving Loans	189,847	254,183
Total LHFI	468,108	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	142,805	88,763
Term Loans by Origination Year, Before Latest Fiscal Year	35,989	40,006
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	28,920	28,239
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	22,720	37,607
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	33,492	6,424
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	9,638	10,829
Financing Receivable, Revolving Loans	179,719	244,882
Total LHFI	453,283	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
Financing Receivable, Revolving Loans	20
Total LHFI	20	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	106	3,728
Term Loans by Origination Year, Before Latest Fiscal Year	3,401	98
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	48
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	1,050	1,134
Financing Receivable, Revolving Loans	10,108	9,301
Total LHFI	14,713	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	92	24
Total LHFI	92	24
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	293,425	363,970
Term Loans by Origination Year, Before Latest Fiscal Year	138,825	119,926
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	51,342	29,632
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	16,270	4,820
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	2,219	1,016
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	2,231	2,406
Financing Receivable, Revolving Loans	58,294	64,997
Total LHFI	562,606	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	293,087	363,824
Term Loans by Origination Year, Before Latest Fiscal Year	138,233	119,727
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	51,342	29,632
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	16,250	3,405
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	2,219	1,016
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	2,166	2,364
Financing Receivable, Revolving Loans	58,294	64,953
Total LHFI	561,591	584,921
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	338	146
Term Loans by Origination Year, Before Latest Fiscal Year	592	199
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	20	1,415
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	23
Financing Receivable, Revolving Loans		44
Total LHFI	973	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	42	42
Total LHFI	42	42
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	28,818	42,726
Term Loans by Origination Year, Before Latest Fiscal Year	33,064	33,441
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	27,976	17,307
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	14,894	9,429
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	8,355	7,018
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	4,536	3,155
Financing Receivable, Revolving Loans	9,275	12,209
Total LHFI	126,918	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	28,114	41,996
Term Loans by Origination Year, Before Latest Fiscal Year	32,346	33,346
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	27,894	17,215
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	14,821	9,341
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	8,273	6,798
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	4,298	2,870
Financing Receivable, Revolving Loans	9,176	12,209
Total LHFI	124,922	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	28	64
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	53	17
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	12
Total LHFI	93	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	704	686
Term Loans by Origination Year, Before Latest Fiscal Year	681	31
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	29	75
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	61	88
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	82	220
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	238	285
Financing Receivable, Revolving Loans	99
Total LHFI	1,894	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
Term Loans by Origination Year, Before Latest Fiscal Year	9
Total LHFI	9	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	102,846	293,081
Term Loans by Origination Year, Before Latest Fiscal Year	368,812	156,386
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	361,897	143,423
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	269,160	107,827
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	92,251	11,302
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	11,758	17,694
Financing Receivable, Revolving Loans	11,631	12,642
Total LHFI	1,218,355	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	102,678	293,051
Term Loans by Origination Year, Before Latest Fiscal Year	353,814	156,386
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	361,897	143,114
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	268,866	107,827
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	56,340	11,297
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	11,711	17,626
Financing Receivable, Revolving Loans	11,631	12,516
Total LHFI	1,166,937	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	14,867
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	35,911
Total LHFI	50,904
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	131
Term Loans by Origination Year, Two Years Before Latest Fiscal Year		309
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	294
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	47	68
Financing Receivable, Revolving Loans		126
Total LHFI	472	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	465,301	911,908
Term Loans by Origination Year, Before Latest Fiscal Year	897,403	658,308
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	646,557	612,972
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	637,368	458,416
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	396,588	206,131
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	396,763	300,334
Financing Receivable, Revolving Loans	129,682	130,745
Total LHFI	3,569,662	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	441,919	889,556
Term Loans by Origination Year, Before Latest Fiscal Year	880,761	657,242
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	599,643	603,515
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	626,109	457,163
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	387,867	205,425
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	387,001	281,828
Financing Receivable, Revolving Loans	129,632	130,052
Total LHFI	3,452,932	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	13,235	10,284
Term Loans by Origination Year, Before Latest Fiscal Year	14,930
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	25,000
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,147	271
Total LHFI	54,312	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	10,123	12,034
Term Loans by Origination Year, Before Latest Fiscal Year	1,712	1,066
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	21,914	9,457
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	10,112	905
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	8,661	706
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	9,748	18,488
Financing Receivable, Revolving Loans	50	693
Total LHFI	62,320	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	24	34
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		77
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	60
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	14	18
Total LHFI	98	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	175,117	372,981
Term Loans by Origination Year, Before Latest Fiscal Year	529,544	314,524
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	180,594	340,388
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	68,641	833
Financing Receivable, Revolving Loans	49	200
Total LHFI	953,945	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	175,054	372,981
Term Loans by Origination Year, Before Latest Fiscal Year	529,544	306,904
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	180,594	340,388
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	68,641	833
Financing Receivable, Revolving Loans	49	200
Total LHFI	953,882	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	63
Term Loans by Origination Year, Before Latest Fiscal Year		7,620
Total LHFI	63	7,620
Consumer LHFI [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	353,429	1,106,630
Term Loans by Origination Year, Before Latest Fiscal Year	1,006,551	635,708
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	572,673	222,935
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	200,611	121,166
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	111,132	89,365
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	308,110	281,553
Financing Receivable, Revolving Loans	472,666	467,483
Total LHFI	3,025,172	2,924,840
Consumer LHFI [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	50,771	72,396
Term Loans by Origination Year, Before Latest Fiscal Year	40,446	26,062
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	13,446	9,699
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	3,530	2,535
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1,230	1,542
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	479	305
Financing Receivable, Revolving Loans	55,654	57,691
Total LHFI	165,556	170,230
Consumer LHFI [Member] | Consumer Loans [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	50,059	70,858
Term Loans by Origination Year, Before Latest Fiscal Year	39,900	25,771
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	13,199	9,514
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	3,511	2,509
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1,217	1,513
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	471	295
Financing Receivable, Revolving Loans	54,101	56,508
Total LHFI	162,458	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	683	1,431
Term Loans by Origination Year, Before Latest Fiscal Year	394	238
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	156	159
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1	8
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	13	23
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	8	10
Financing Receivable, Revolving Loans	1,109	946
Total LHFI	2,364	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	29	28
Term Loans by Origination Year, Before Latest Fiscal Year	39	12
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	1	7
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	2	1
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		2
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year
Financing Receivable, Revolving Loans	409	216
Total LHFI	480	266
Consumer LHFI [Member] | Consumer Loans [Member] | Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year		79
Term Loans by Origination Year, Before Latest Fiscal Year	113	41
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	90	19
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	16	17
Term Loans by Origination Year, Four Years Before Latest Fiscal Year		4
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year
Financing Receivable, Revolving Loans	35	21
Total LHFI	254	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	37,611	62,049
Term Loans by Origination Year, Before Latest Fiscal Year	42,513	33,075
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	7,316	3,304
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,754	1,795
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1,209	1,694
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	2,206	1,932
Financing Receivable, Revolving Loans	166
Total LHFI	92,775	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	37,611	62,049
Term Loans by Origination Year, Before Latest Fiscal Year	42,200	32,867
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	7,116	3,304
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	1,754	1,759
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	1,176	1,679
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	2,185	1,915
Financing Receivable, Revolving Loans	166
Total LHFI	92,208	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	313	150
Term Loans by Origination Year, Three Years Before Latest Fiscal Year		36
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	33	15
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	17	9
Total LHFI	363	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	200
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	4	8
Total LHFI	204	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	20,518	25,509
Term Loans by Origination Year, Before Latest Fiscal Year	13,937	8,042
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	6,023	5,408
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	4,623	5,049
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	4,917	3,713
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	10,036	7,992
Financing Receivable, Revolving Loans	416,846	409,792
Total LHFI	476,900	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	20,453	25,402
Term Loans by Origination Year, Before Latest Fiscal Year	13,762	7,983
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	5,905	5,389
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	4,603	4,894
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	4,438	3,701
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	8,965	7,252
Financing Receivable, Revolving Loans	406,021	403,123
Total LHFI	464,147	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	6	19
Term Loans by Origination Year, Before Latest Fiscal Year	41	35
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	58	15
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	10	134
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	44	5
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	522	286
Financing Receivable, Revolving Loans	5,880	3,197
Total LHFI	6,561	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	6
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	67
Financing Receivable, Revolving Loans	654	452
Total LHFI	727	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	59	88
Term Loans by Origination Year, Before Latest Fiscal Year	128	24
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	60	4
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	10	20
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	435	7
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	482	454
Financing Receivable, Revolving Loans	4,291	3,020
Total LHFI	5,465	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	81
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	63	89
Total LHFI	144	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	81
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	63	89
Total LHFI	144	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	9
Total LHFI	9	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	9
Total LHFI	9	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	244,529	946,676
Term Loans by Origination Year, Before Latest Fiscal Year	909,655	568,513
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	545,879	204,435
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	190,623	111,787
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	103,776	82,411
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	295,326	271,235
Total LHFI	2,289,788	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	242,667	939,511
Term Loans by Origination Year, Before Latest Fiscal Year	886,235	559,804
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	529,310	198,769
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	183,816	109,466
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	101,283	80,249
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	284,715	262,196
Total LHFI	2,228,026	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	1,458	3,967
Term Loans by Origination Year, Before Latest Fiscal Year	12,375	3,752
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	6,151	2,119
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	2,270	425
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	297
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	1,996	1,906
Total LHFI	24,547	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	246	835
Term Loans by Origination Year, Before Latest Fiscal Year	1,169	777
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	938	272
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	139
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	65	1,100
Total LHFI	2,557	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	158	2,363
Term Loans by Origination Year, Before Latest Fiscal Year	9,876	4,180
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	9,480	3,275
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	4,398	1,896
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	2,196	2,028
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	8,550	6,033
Total LHFI	34,658	$ 19,775
Current Period Gross Charge-offs [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	4,479
Term Loans by Origination Year, Before Latest Fiscal Year	5,067
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	1,073
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	297
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	352
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	356
Financing Receivable, Revolving Loans	1,641
Total LHFI	13,265
Consumer Borrower Gross Charge-offs [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	4,390
Term Loans by Origination Year, Before Latest Fiscal Year	1,090
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	307
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	133
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	110
Financing Receivable, Revolving Loans	1,634
Total LHFI	7,675
Consumer Borrower Gross Charge-offs [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	4,389
Term Loans by Origination Year, Before Latest Fiscal Year	434
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	146
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	41
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	1,553
Total LHFI	6,565
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	94
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	5
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	17
Financing Receivable, Revolving Loans	81
Total LHFI	207
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	1
Term Loans by Origination Year, Before Latest Fiscal Year	562
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	156
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	92
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	92
Total LHFI	903
Commercial Borrower Gross Charge-offs [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Current Fiscal Year	89
Term Loans by Origination Year, Before Latest Fiscal Year	3,977
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	766
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	164
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	341
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	246
Financing Receivable, Revolving Loans	7
Total LHFI	5,590
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	28
Term Loans by Origination Year, Before Latest Fiscal Year	536
Term Loans by Origination Year, Two Years Before Latest Fiscal Year	651
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	138
Term Loans by Origination Year, Four Years Before Latest Fiscal Year	94
Term Loans by Origination Year, Five or More Years Before Latest Fiscal Year	108
Financing Receivable, Revolving Loans	7
Total LHFI	1,562
Commercial Borrower Gross Charge-offs [Member] | Other Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, Before Latest Fiscal Year	6
Term Loans by Origination Year, Three Years Before Latest Fiscal Year	26
Total LHFI	32
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	23
Total LHFI	23
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, Before Latest Fiscal Year	3,392
Total LHFI	$ 3,453

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)	9 Months Ended
	Sep. 30, 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
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] | Equipment Finance Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	WARM
Loss Drivers	Southern Unemployment, Southern GDP
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
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
Consumer Loans [Member] | Consumer Loans [Member] | All Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Southern Unemployment
Consumer Loans [Member] | Consumer Loans [Member] | Credit Cards [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	WARM
Loss Drivers	Trustmark call report data
Consumer Loans [Member] | Consumer Loans [Member] | Overdrafts [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	Loss Rate
Loss Drivers	Trustmark historical data
State and Other Political Subdivision Loans [Member] | State and Other Political Subdivision Loans [Member] | Obligations of State and Political Subdivisions [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Moody's Bond Default Study
Other Commercial Loans [Member] | Other Commercial Loans [Member] | Commercial and Industrial - Non-Working Capital [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Trustmark historical data
Other Commercial Loans [Member] | Other Commercial Loans [Member] | Commercial and Industrial - Working Capital [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Trustmark historical data
Other Commercial Loans [Member] | Other Commercial Loans [Member] | Other Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Prime Rate, Southern Unemployment

LHFI and ACL, LHFI - Summary _3

LHFI and ACL, LHFI - Summary of Balance in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	$ 14,955		$ 17,687
Individually Evaluated for Credit Loss	47,378		40,288
Collectively Evaluated for Credit Loss	119,076		102,527
Collectively Evaluated for Credit Loss	12,762,881		12,163,751
Total LHFI	12,810,259		12,204,039
Total	134,031	$ 129,298	120,214	$ 115,050	$ 103,140	$ 99,457
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	9,118		9,946
Individually Evaluated for Credit Loss	9,232		24,594
Collectively Evaluated for Credit Loss	14,637		13,194
Collectively Evaluated for Credit Loss	1,819,692		1,796,665
Total LHFI	1,828,924		1,821,259
Total	23,755	23,170	23,140	24,104	14,103	18,939
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss	5,804		5,792
Collectively Evaluated for Credit Loss	165,556		170,230
Total LHFI	165,556		170,230
Total	5,804	5,540	5,792	5,028	5,139	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	665		885
Collectively Evaluated for Credit Loss	1,056,569		1,223,863
Total LHFI	1,056,569		1,223,863
Total	665	676	885	1,594	1,917	2,708
Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss	5,837		0
Individually Evaluated for Credit Loss	13,371		0
Collectively Evaluated for Credit Loss	4,853		4,647
Collectively Evaluated for Credit Loss	454,737		471,930
Total LHFI	468,108		471,930
Total	10,690	5,607	4,647	4,698	4,963	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	0		1,558
Collectively Evaluated for Credit Loss	17,241		12,707
Collectively Evaluated for Credit Loss	655,381		689,058
Total LHFI	655,381		690,616
Total	17,241	15,343	12,828	10,251	7,301	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	980		482
Collectively Evaluated for Credit Loss	12,563		12,374
Collectively Evaluated for Credit Loss	602,838		590,308
Total LHFI	603,818		590,790
Total	12,563	12,173	12,374	10,739	10,038	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	20,973		4,841
Collectively Evaluated for Credit Loss	23,298		19,488
Collectively Evaluated for Credit Loss	3,548,698		3,273,989
Total LHFI	3,569,671		3,278,830
Total	23,298	20,376	19,488	25,924	29,735	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	3,565		4,743
Collectively Evaluated for Credit Loss	1,218,499		742,538
Total LHFI	1,218,499		742,538
Total	3,565	3,481	4,743	3,398	3,297	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	6,306		7,512
Collectively Evaluated for Credit Loss	953,945		1,021,306
Total LHFI	953,945		1,028,926
Total	6,306	14,377	15,132	13,919	14,397	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	2,822		1,193
Collectively Evaluated for Credit Loss	30,144		21,185
Collectively Evaluated for Credit Loss	2,286,966		2,183,864
Total LHFI	2,289,788		2,185,057
Total	$ 30,144	$ 28,555	$ 21,185	$ 15,395	$ 12,250	$ 2,706

LHFI and ACL, LHFI - Change in

LHFI and ACL, LHFI - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 129,298	$ 103,140	$ 120,214	$ 99,457
Loans charged-off	(7,496)	(2,920)	(13,265)	(7,439)
Recoveries	3,907	1,911	7,305	8,257
Net (charge-offs) recoveries	(3,589)	(1,009)	(5,960)	818
Provision for credit losses (PCL), LHFI	8,322	12,919	19,777	14,775
Balance at end of period	134,031	115,050	134,031	115,050
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	23,170	14,103	23,140	18,939
Loans charged-off	(635)	(191)	(1,562)	(566)
Recoveries	267	111	754	414
Provision for credit losses (PCL), LHFI	953	10,081	1,423	5,317
Balance at end of period	23,755	24,104	23,755	24,104
Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for credit losses (PCL), LHFI			5,400
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,540	5,139	5,792	4,774
Loans charged-off	(2,421)	(458)	(6,565)	(1,394)
Recoveries	1,337	425	3,875	1,256
Provision for credit losses (PCL), LHFI	1,348	(78)	2,702	392
Balance at end of period	5,804	5,028	5,804	5,028
State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	676	1,917	885	2,708
Loans charged-off	0		0
Recoveries	0		0
Provision for credit losses (PCL), LHFI	(11)	(323)	(220)	(1,114)
Balance at end of period	665	1,594	665	1,594
Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	5,607	4,963	4,647	5,348
Loans charged-off	(9)	(1,859)	(32)	(4,761)
Recoveries	0	933	0	2,941
Provision for credit losses (PCL), LHFI	5,092	661	6,075	1,170
Balance at end of period	10,690	4,698	10,690	4,698
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	15,343	7,301	12,828	6,079
Loans charged-off	(228)	(189)	(242)	(223)
Recoveries	22	43	94	1,230
Provision for credit losses (PCL), LHFI	2,104	3,096	4,561	3,165
Balance at end of period	17,241	10,251	17,241	10,251
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	12,173	10,038	12,374	10,310
Loans charged-off	(110)	(33)	(230)	(95)
Recoveries	43	234	165	529
Provision for credit losses (PCL), LHFI	457	500	254	(5)
Balance at end of period	12,563	10,739	12,563	10,739
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	20,376	29,735	19,488	37,912
Loans charged-off	(192)	0	(278)
Recoveries	2,216	35	2,322	1,536
Provision for credit losses (PCL), LHFI	898	(3,846)	1,766	(13,524)
Balance at end of period	23,298	25,924	23,298	25,924
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	3,481	3,297	4,743	4,713
Loans charged-off	0	0	0	(131)
Recoveries	0	4	5	11
Provision for credit losses (PCL), LHFI	84	97	(1,183)	(1,195)
Balance at end of period	3,565	3,398	3,565	3,398
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	28,555	12,250	21,185	2,706
Loans charged-off	(448)	(37)	(903)	(116)
Recoveries	7	125	27	135
Provision for credit losses (PCL), LHFI	2,030	3,057	9,835	12,670
Balance at end of period	30,144	15,395	30,144	15,395
Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	14,377	14,397	15,132	5,968
Loans charged-off	(3,453)	(153)	(3,453)	(153)
Recoveries	15	1	63	205
Provision for credit losses (PCL), LHFI	(4,633)	(326)	(5,436)	7,899
Balance at end of period	$ 6,306	$ 13,919	$ 6,306	$ 13,919

Mortgage Banking - Schedule of

Mortgage Banking - Schedule of Activity in the Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Mortgage servicing rights [Abstract]
Balance at beginning of period	$ 129,677	$ 87,687
Origination of servicing assets	11,025	14,452
Change in fair value [Abstract]
Due to market changes	8,735	41,529
Due to run-off	(7,058)	(11,053)
Balance at end of period	$ 142,379	$ 132,615
Servicing Asset, Fair Value, Change in Fair Value, Valuation Input, Statement of Income or Comprehensive Income [Extensible Enumeration]	Mortgage Banking Income	Mortgage Banking Income

Mortgage Banking - Additional I

Mortgage Banking - Additional Information (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) CPR	Sep. 30, 2022 USD ($) CPR
Mortgage servicing rights [Abstract]
Assumed average prepayment speed | CPR	8	8
Average discount rate	10.07%	9.58%
Residential mortgage loans sold	$ 893,000	$ 1,026,000
Period of putback response	60 days
Reserve for mortgage loan servicing putback expenses	$ 500	500
Gains on sale of mortgage banking	$ 11,400	$ 16,900

Mortgage Banking - Schedule o_2

Mortgage Banking - Schedule of Mortgage Loans Sold and Serviced for Others (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	$ 8,403,385	$ 8,115,824
Federal National Mortgage Association [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	4,802,861	4,684,815
Government National Mortgage Association [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	3,478,965	3,350,222
Federal Home Loan Mortgage Corporation [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	90,119	52,023
Other [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	$ 31,440	$ 28,764

Other Real Estate - Changes and

Other Real Estate - Changes and Gains (Losses), Net on Other Real Estate (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance at beginning of period	$ 1,986	$ 4,557
Additions	5,434	1,430
Disposals	(1,903)	(2,503)
(Write-downs) recoveries	(32)	(513)
Balance at end of period	5,485	2,971
Gains (losses), net on the sale of other real estate included in other real estate expense	$ (159)	$ (465)

Other Real Estate - Other Real

Other Real Estate - Other Real Estate, by Type of Property (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Other real estate [Line Items]
Total other real estate	$ 5,485	$ 1,986	$ 2,971	$ 4,557
1 - 4 Family Residential Properties [Member]
Other real estate [Line Items]
Total other real estate	902	1,128
Nonfarm, Nonresidential Properties [Member]
Other real estate [Line Items]
Total other real estate	4,528	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 ($)		Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Other Real Estate by Geographic Location [Line Items]
Total other real estate		$ 5,485,000	$ 1,986,000	$ 2,971,000	$ 4,557,000
Alabama [Member]
Other Real Estate by Geographic Location [Line Items]
Total other real estate		315,000	194,000
Mississippi [Member]
Other Real Estate by Geographic Location [Line Items]
Total other real estate	[1]	942,000	1,769,000
Tennessee [Member]
Other Real Estate by Geographic Location [Line Items]
Total other real estate	[2]	0	23,000
Texas [Member]
Other Real Estate by Geographic Location [Line Items]
Total other real estate		$ 4,228,000	$ 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 Thousands	Sep. 30, 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	$ 902	$ 1,100
Consumer mortgage loans and that formal foreclosure proceedings are in process	$ 6,000	$ 2,900

Leases - Components of Net Leas

Leases - Components of Net Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Finance leases:
Amortization of right-of-use assets	$ 113	$ 356	$ 673	$ 1,122
Interest on lease liabilities	41	46	124	143
Operating lease cost	1,372	1,309	3,976	3,877
Short-term lease cost	62	98	218	328
Variable lease cost	208	257	690	891
Sublease income	(3)	(4)	(9)	(166)
Net lease cost	$ 1,793	$ 2,062	$ 5,672	$ 6,195

Leases - Cash Payments Included

Leases - Cash Payments Included in Measurement of Lease Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Finance leases:
Operating cash flows included in operating activities	$ 124	$ 143
Financing cash flows included in payments under finance lease obligations	627	1,070
Operating leases:
Operating cash flows (fixed payments) included in other operating activities, net	3,430	4,389
Operating cash flows (liability reduction) included in other operating activities, net	$ 2,771	$ 3,075

Leases - Balance Sheet Informat

Leases - Balance Sheet Information and Weighted-Average Lease Terms and Discount Rates Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Leases [Abstract]
Finance lease right-of-use assets, net of accumulated depreciation	$ 3,864	$ 4,537
Finance lease liabilities	4,427	5,055
Operating lease right-of-use assets	39,639	36,301
Operating lease liabilities	$ 42,730	$ 38,932
Weighted-average lease term:
Finance leases	8 years 7 months 6 days	8 years 8 months 19 days
Operating leases	10 years 1 month 24 days	9 years 7 months 20 days
Weighted-average discount rate:
Finance leases	3.61%	3.49%
Operating leases	3.63%	3.22%

Leases - Future Minimum Rental

Leases - Future Minimum Rental Commitments Under Finance and Operating Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Leases [Abstract]
2023 (excluding the nine months ended September 30, 2023)	$ 133
Finance leases, 2024	572
Finance leases, 2025	584
Finance leases, 2026	589
Finance leases, 2027	594
Finance Lease Thereafter	2,685
Finance leases, total minimum lease payments	5,157
Finance leases, imputed interest	(730)
Finance lease liabilities	4,427	$ 5,055
Operating leases, 2023 (excluding the six months ended June 30, 2023)	843
Operating leases 2024	5,394
Operating leases, 2025	5,425
Operating leases, 2026	5,176
Operating leases, 2027	4,971
Operating leases, Thereafter	30,194
Operating leases, total minimum lease payments	52,003
Operating leases, imputed interest	(9,273)
Operating lease liabilities	$ 42,730	$ 38,932

Deposits - Deposits Summary (De

Deposits - Deposits Summary (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Deposits [Abstract]
Noninterest-bearing demand	$ 3,320,124	$ 4,093,771
Interest-bearing demand	4,835,577	4,773,219
Savings	3,547,547	4,282,435
Time	3,398,675	1,288,223
Total deposits	$ 15,101,923	$ 14,437,648

Securities Sold Under Repurch_3

Securities Sold Under Repurchase Agreement - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Disclosure [Abstract]
Securities sold under repurchase agreements, secured by securities carrying amount	$ 61	$ 102.4

Securities Sold Under Repurch_4

Securities Sold Under Repurchase Agreements - Schedule of Securities Sold Under Repurchase Agreements (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements	$ 43,402	$ 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	42,108	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	1,294	1,111
Commercial Mortgage-Backed Securities [Member]
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements	$ 0	$ 21,277

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from Contract with Customer [Abstract]
Other real estate sales, net gains (losses)	$ (47)	$ (11)	$ (159)	$ (465)

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Summary of Noninterest Income Disaggregated by Reportable Operating Segment and Revenue Stream (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		$ 11,074	$ 11,318	$ 32,105	$ 30,995
Bank card and other fees		8,217	9,305	24,937	27,914
Mortgage banking, net		6,458	6,876	20,697	24,898
Insurance commissions		15,303	13,911	44,372	41,702
Wealth management		8,773	8,778	26,435	26,934
Other, net		2,399	2,418	8,608	7,531
Total Noninterest Income		52,224	52,606	157,154	159,974
Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		11,074	11,318	32,105	30,995
Bank card and other fees		7,344	7,657	23,047	23,761
Insurance commissions		15,303	13,911	44,372	41,702
Wealth management		8,773	8,778	26,435	26,934
Other, net		2,884	2,169	9,839	6,606
Total Noninterest Income		45,378	43,833	135,798	129,998
Not Topic 606 [Member
Revenue From Contract With Customer [Line Items]
Bank card and other fees	[1]	873	1,648	1,890	4,153
Mortgage banking, net	[1]	6,458	6,876	20,697	24,898
Other, net	[1]	(485)	249	(1,231)	925
Total Noninterest Income	[1]	6,846	8,773	21,356	29,976
General Banking Segment [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		11,052	11,296	32,040	30,932
Bank card and other fees		8,205	9,292	24,901	27,879
Mortgage banking, net		6,458	6,876	20,697	24,898
Wealth management		202	263	650	468
Other, net		2,264	1,963	7,247	6,993
Total Noninterest Income		28,181	29,690	85,535	91,170
General Banking Segment [Member] | Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		11,052	11,296	32,040	30,932
Bank card and other fees		7,332	7,644	23,011	23,726
Wealth management		202	263	650	468
Other, net		2,843	1,724	8,763	6,097
Total Noninterest Income		21,429	20,927	64,464	61,223
General Banking Segment [Member] | Not Topic 606 [Member
Revenue From Contract With Customer [Line Items]
Bank card and other fees	[1]	873	1,648	1,890	4,153
Mortgage banking, net	[1]	6,458	6,876	20,697	24,898
Other, net	[1]	(579)	239	(1,516)	896
Total Noninterest Income	[1]	6,752	8,763	21,071	29,947
Wealth Management Segment [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		22	22	65	63
Bank card and other fees		12	13	36	35
Wealth management		8,571	8,515	25,785	26,466
Other, net		135	457	407	541
Total Noninterest Income		8,740	9,007	26,293	27,105
Wealth Management Segment [Member] | Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		22	22	65	63
Bank card and other fees		12	13	36	35
Wealth management		8,571	8,515	25,785	26,466
Other, net		41	447	122	512
Total Noninterest Income		8,646	8,997	26,008	27,076
Wealth Management Segment [Member] | Not Topic 606 [Member
Revenue From Contract With Customer [Line Items]
Other, net	[1]	94	10	285	29
Total Noninterest Income	[1]	94	10	285	29
Insurance Segment [Member]
Revenue From Contract With Customer [Line Items]
Insurance commissions		15,303	13,911	44,372	41,702
Other, net			(2)	954	(3)
Total Noninterest Income		15,303	13,909	45,326	41,699
Insurance Segment [Member] | Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Insurance commissions		15,303	13,911	44,372	41,702
Other, net			(2)	954	(3)
Total Noninterest Income		$ 15,303	13,909	$ 45,326	41,699
Insurance Segment [Member] | Not Topic 606 [Member
Revenue From Contract With Customer [Line Items]
Total Noninterest Income	[1]		$ 0		$ 0
[1] Noninterest income not in scope for FASB ASC Topic 606 includes customer derivatives revenue and miscellaneous credit card fee income within bank card and other fees; mortgage banking, net; amortization of tax credits, accretion of the FDIC indemnification asset, cash surrender value on various life insurance policies, earnings on Trustmark’s non-qualified deferred compensation plans, other partnership investments and rental income within other, net; and security gains (losses), net.

Defined Benefit and Other Pos_3

Defined Benefit and Other Postretirement Benefits - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Trustmark Capital Accumulation Plan [Member] | Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions [Member]
Net periodic benefit cost [Abstract]
Service cost	$ 13	$ 28	$ 39	$ 86
Interest cost	73	48	219	144
Expected return on plan assets	(27)	(30)	(80)	(90)
Recognized net loss due to lump sum settlements	0	0	25	0
Recognized net actuarial loss	0	52	0	172
Net periodic benefit cost	59	98	203	312
Supplemental Retirement Plan [Member]
Net periodic benefit cost [Abstract]
Service cost	17	18	51	54
Interest cost	497	316	1,515	962
Amortization of prior service cost	28	28	83	83
Recognized net actuarial loss	70	243	216	742
Net periodic benefit cost	$ 612	$ 605	$ 1,865	$ 1,841

Defined Benefit and Other Pos_4

Defined Benefit and Other Postretirement Benefits - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Trustmark Capital Accumulation Plan [Member] | Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Trustmark's minimum required contribution to the Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions	$ 159

Stock and Incentive Compensat_3

Stock and Incentive Compensation - Additional Information (Details)	9 Months Ended
	Sep. 30, 2023
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 Award [Member] | Management [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Time Based Award [Member] | Director [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	1 year

Stock and Incentive Compensat_4

Stock and Incentive Compensation - Summary of Stock Plan Activity (Details) - Stock and Incentive Compensation Plan [Member] - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Performance Units [Member]
Shares [Roll Forward]
Nonvested shares, beginning of period (in shares)	174,214	148,416
Granted (in shares)	0	70,666
Released from restriction (in shares)	0	(39,943)
Forfeited (in shares)	0	(4,925)
Nonvested shares, end of period (in shares)	174,214	174,214
Time-Vested Awards [Member]
Shares [Roll Forward]
Nonvested shares, beginning of period (in shares)	364,198	312,978
Granted (in shares)	0	145,003
Released from restriction (in shares)	(1,500)	(89,041)
Forfeited (in shares)	(688)	(6,930)
Nonvested shares, end of period (in shares)	362,010	362,010

Stock and Incentive Compensat_5

Stock and Incentive Compensation - Compensation Expense for Awards and Units Under Stock Plan (Details) - Stock and Incentive Compensation Plan [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Compensation expense [Abstract]
Recognized compensation expense	$ 1,494	$ 1,229	$ 4,772	$ 3,714
Performance Units [Member]
Compensation expense [Abstract]
Recognized compensation expense	449	381	1,181	916
Time-Vested Units [Member]
Compensation expense [Abstract]
Recognized compensation expense	$ 1,045	$ 848	$ 3,591	$ 2,798

Contingencies - Additional Info

Contingencies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Loss Contingencies [Line Items]
Unused commitments to extend credit	$ 5,030,000		$ 5,171,000	$ 5,030,000	$ 5,171,000
Litigation settlement expense	6,500		0	6,500	0
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Potential exposure to credit loss in the event of nonperformance	127,800		140,600	$ 127,800	140,600
Letters of credit, maturity term - maximum				3 years
Collateral held, fair value	32,000		$ 32,600	$ 32,000	$ 32,600
Settlement Agreement [Member]
Loss Contingencies [Line Items]
Payments for legal settlements	6,500					$ 100,000
Litigation settlement expense	$ 6,500	$ 100,000
Legal fees		$ 750

Contingencies - Summary of Chan

Contingencies - Summary of Changes in ACL on Off-Balance Sheet Credit Exposures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 34,841	$ 32,949	$ 36,838	$ 35,623
PCL, off-balance sheet credit exposures	104	(1,326)	(1,893)	(4,000)
Balance at end of period	$ 34,945	$ 31,623	$ 34,945	$ 31,623

Earnings Per Share (EPS) - Weig

Earnings Per Share (EPS) - Weighted-Average Shares Used to Calculate Basic and Diluted EPS (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Basic shares	61,070,000	61,115,000	61,048,000	61,334,000
Dilutive shares	193,000	204,000	171,000	186,000
Diluted shares	61,263,000	61,319,000	61,219,000	61,520,000

Earnings Per Share (EPS) - We_2

Earnings Per Share (EPS) - Weighted-Average Antidilutive Stock Awards Excluded from Determining Diluted EPS (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share [Abstract]
Weighted-average antidilutive stock awards (in shares)	23	0	75	0

Statements of Cash Flows - Cash

Statements of Cash Flows - Cash Flows Supplementary Disclosures (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Statement of cash flows specific transaction amounts [Abstract]
Income taxes paid	$ 34,898	$ 1,241
Interest expense paid on deposits and borrowings	214,745	17,077
Noncash transfers from loans to other real estate	5,434	1,430
Operating right-of-use assets resulting from lease liabilities	$ 7,092	$ 6,572

Shareholders' Equity - Addition

Shareholders' Equity - Additional Information (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 06, 2022	Dec. 07, 2021
Stockholders Equity [Line items]
Capital conservation buffer rate	2.50%
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

Shareholders' Equity - Table of

Shareholders' Equity - Table of Actual Regulatory Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Sep. 30, 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	$ 1,498,217	$ 1,413,672
Actual Regulatory Capital Ratio	9.89%	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	$ 1,558,217	$ 1,473,672
Actual Regulatory Capital Ratio	10.29%	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	$ 1,834,295	$ 1,729,499
Actual Regulatory Capital Ratio	12.11%	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	$ 1,558,217	$ 1,473,672
Actual Regulatory Capital Ratio	8.49%	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	$ 1,579,132	$ 1,501,889
Actual Regulatory Capital Ratio	10.43%	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	$ 1,579,132	$ 1,501,889
Actual Regulatory Capital Ratio	10.43%	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	$ 1,731,783	$ 1,634,454
Actual Regulatory Capital Ratio	11.44%	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	$ 1,579,132	$ 1,501,889
Actual Regulatory Capital Ratio	8.63%	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	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax amount	$ (29,576)	$ (132,361)	$ (16,953)	$ (365,138)
Other Comprehensive Income (Loss), Tax, Total	7,392	33,091	4,468	91,286
Other comprehensive income (loss), before reclassifications, net of tax amount			21,394	(274,118)
Reclassification from accumulated other comprehensive income, current period, net of tax amount			(8,909)	(266)
Other comprehensive income (loss), net of tax amount	(22,184)	(99,270)	(12,485)	(273,852)
Securities Available for Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, before tax amount	(26,963)	(114,317)	(16,062)	(314,517)
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, before tax amount	4,000	1,800	11,799	(31,451)
Other comprehensive income (loss), before tax amount	(22,963)	(112,517)	(4,263)	(345,968)
Other comprehensive income (loss), before reclassifications, tax (expense) benefit	6,740	28,580	4,246	78,630
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, tax (expense) benefit	(1,000)	(450)	(2,950)	7,863
Other Comprehensive Income (Loss), Tax, Total	5,740	28,130	1,296	86,493
Other comprehensive income (loss), before reclassifications, net of tax amount	(20,223)	(85,737)	(11,816)	(235,887)
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, net of tax amount	3,000	1,350	8,849	(23,588)
Other comprehensive income (loss), net of tax amount	(17,223)	(84,387)	(2,967)	(259,475)
Net Change in Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax amount	28	28	83	83
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(7)	(7)	(21)	(21)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	21	21	62	62
Recognized Net Loss Due to Lump Sum Settlements [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax amount	0	0	25	0
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	0	0	(6)	0
Reclassification from accumulated other comprehensive income, current period, net of tax amount	0	0	19	0
Change in Net Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax amount	70	295	216	914
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(18)	(74)	(54)	(228)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	52	221	162	686
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	98	323	324	997
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(25)	(81)	(81)	(249)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	73	242	243	748
Cash Flow Hedge Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, before tax amount	(11,338)	(19,524)	(24,569)	(19,524)
Reclassification from accumulated other comprehensive income, current period, before tax amount	4,627	(643)	11,555	(643)
Other comprehensive income (loss), before tax amount	(6,711)	(20,167)	(13,014)	(20,167)
Other comprehensive income (loss), before reclassifications, tax (expense) benefit	2,834	4,881	6,142	4,881
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(1,157)	161	(2,889)	161
Other Comprehensive Income (Loss), Tax, Total	1,677	5,042	3,253	5,042
Other comprehensive income (loss), before reclassifications, net of tax amount	(8,504)	(14,643)	(18,427)	(14,643)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	3,470	(482)	8,666	(482)
Other comprehensive income (loss), net of tax amount	$ (5,034)	$ (15,125)	$ (9,761)	$ (15,125)

Shareholders' Equity - Changes

Shareholders' Equity - Changes in Balances of Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 1,571,193	$ 1,586,696	$ 1,492,268	$ 1,741,311
Other comprehensive income (loss) before reclassification			21,394	(274,118)
Amounts reclassified from accumulated other comprehensive income (loss)			8,909	266
Other comprehensive income (loss), net of tax amount	(22,184)	(99,270)	(12,485)	(273,852)
Balance	1,570,351	1,508,945	1,570,351	1,508,945
Securities Available for Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(254,442)	(17,774)
Other comprehensive income (loss) before reclassification			(2,967)	(259,475)
Amounts reclassified from accumulated other comprehensive income (loss)			0	0
Other comprehensive income (loss), net of tax amount			(2,967)	(259,475)
Balance	(257,409)	(277,249)	(257,409)	(277,249)
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(5,792)	(14,786)
Other comprehensive income (loss) before reclassification			0	0
Amounts reclassified from accumulated other comprehensive income (loss)			243	748
Other comprehensive income (loss), net of tax amount			243	748
Balance	(5,549)	(14,038)	(5,549)	(14,038)
Cash Flow Hedge Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance			(15,169)	0
Other comprehensive income (loss) before reclassification			(18,427)	14,643
Amounts reclassified from accumulated other comprehensive income (loss)			8,666	(482)
Other comprehensive income (loss), net of tax amount			(9,761)	(15,125)
Balance	(24,930)	(15,125)	(24,930)	(15,125)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(265,704)	(207,142)	(275,403)	(32,560)
Balance	$ (287,888)	$ (306,412)	$ (287,888)	$ (306,412)

Fair Value - Financial Assets a

Fair Value - Financial Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 1,766,174	$ 2,024,082
Loans held for sale	169,244	135,226
Mortgage servicing rights (MSR)	142,379	129,677	$ 132,615	$ 87,687
U.S. Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	363,476	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	6,780	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	4,642	4,862
Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,766,174	2,024,082
Loans held for sale	169,244	135,226
Mortgage servicing rights (MSR)	142,379	129,677
Other assets - derivatives	16,846	8,871
Other liabilities - derivatives	$ 56,135	$ 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	$ 363,476	$ 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	6,780	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	4,642	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	1,391,276	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	363,476	391,513
Loans held for sale	0	0
Mortgage servicing rights (MSR)	0	0
Other assets - derivatives	8	54
Other liabilities - derivatives	3,327	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	363,476	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	1,402,698	1,632,569
Loans held for sale	169,244	135,226
Mortgage servicing rights (MSR)	0	0
Other assets - derivatives	16,641	8,660
Other liabilities - derivatives	52,808	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	6,780	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	4,642	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	1,391,276	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)	142,379	129,677
Other assets - derivatives	197	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		9 Months Ended
		Sep. 30, 2023	Sep. 30, 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]	1,677	30,476
Additions		11,025	14,452
Sales		0	0
Ending Balance		142,379	132,615
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		8,734	41,530
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	[1]	1,672	(401)
Additions		0	0
Sales		(1,632)	(2,326)
Ending Balance		197	(868)
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		$ 559	$ (1,181)
[1] Total net (loss) gain included in Mortgage banking, net relating to the MSR includes changes in fair value due to market changes and due to run-off

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Fair Value Disclosures [Abstract]
Outstanding balances in collateral dependent related to allowance for credit losses	$ 47,400		$ 47,400		$ 40,300
Collateral dependent related to allowance for credit losses	15,000		15,000		17,700
Foreclosed assets remeasured after initial recognition			765	$ 3,000
Write-downs of allowance for foreclosed assets after initial recognition			205	1,000
Noninterest gain (loss) Mortgage banking, net for changes in fair value of LHFS	602	$ (4,400)	841	(6,700)
Interest earned on LHFS included in Interest and fees on LHFS and LHFI	2,300	$ 2,000	5,900	$ 5,200
Serviced GNMA loans eligible for repurchase	$ (63,700)		$ (63,700)		$ (70,800)

Fair Value - Carrying Amounts a

Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity	$ 1,438,287	$ 1,494,514
Deposits	15,101,923	14,437,648
Federal funds purchased and securities sold under repurchase agreements	321,799	449,331
Other borrowings	793,193	1,050,938
Subordinated notes	123,427	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	750,492	738,787
Securities held to maturity	1,438,287	1,494,514
Deposits	15,101,923	14,437,648
Federal funds purchased and securities sold under repurchase agreements	321,799	449,331
Other borrowings	793,193	1,050,938
Subordinated notes	123,427	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	750,492	738,787
Securities held to maturity	1,312,871	1,406,589
Deposits	15,076,677	14,404,661
Federal funds purchased and securities sold under repurchase agreements	321,799	449,331
Other borrowings	793,188	1,050,932
Subordinated notes	103,750	113,125
Junior subordinated debt securities	45,928	46,392
Level 3 [Member] | Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI	12,676,228	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	$ 12,505,990	$ 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	Sep. 30, 2023	Dec. 31, 2022
Fair value and the contractual principal outstanding of the LHFS [Abstract]
Fair value of LHFS	$ 105,542	$ 64,421
LHFS contractual principal outstanding	105,618	63,427
Fair value less unpaid principal	$ (76)	$ 994

Derivative Financial Instrume_3

Derivative Financial Instruments - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) Contract	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) Contract	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) Contract
Designated as Hedging Instrument [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total excluded components of earnings recognition	$ 13		$ 35
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	1,000,000		1,000,000		$ 825,000
Interest and fees on LHFS and LHFI reclassified as a reduction over twelve months			18,400
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	$ 1,000,000		$ 1,000,000		$ 825,000
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	5		5		5
Aggregate notional amount of credit risk participation agreements	$ 49,100		$ 49,100		$ 50,200
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	34		34		29
Aggregate notional amount of credit risk participation agreements	$ 281,900		$ 281,900		$ 235,800
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	1,365,000		1,365,000		1,391,000
Termination value of derivatives	0		0		0
Collateral Posted	40		40		740
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	133,000		133,000		97,000
Valuation adjustment			1,500		168
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	96,800		96,800		68,400
Valuation adjustment			197		157
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	270,000		270,000		$ 277,000
Net (negative) positive ineffectiveness on MSR fair value	$ 1,000	$ 928	$ 4,100	$ 554

Derivative Financial Instrume_4

Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset		$ 16,640	$ 9,415
Fair value of derivative liability		54,255	44,304
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	[1]	2,302	761
Designated as Hedging Instrument [Member] | Interest Rate Floor [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Interest rate fair value of derivative asset		203	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		1	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		32	8
Derivatives not Designated as Hedging Instruments [Member] | Future Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset		0	16
Derivatives not Designated as Hedging Instruments [Member] | Future Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability		2,764	268
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability		(1,479)	(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		8	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		197	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]	16,437	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]	51,953	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		$ 563	$ 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	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
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	Interest and Fee Income, Loan and Lease, Held-in-Portfolio
Designated as Hedging Instrument [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	$ (4,627)	$ 643	$ (11,555)	$ 643
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	(7,634)	(8,405)	(11,526)	(39,181)
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	$ 381	$ 63	$ 571	$ 385

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	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss), net of tax	$ (3,470)	$ 482	$ (8,666)	$ 482
Derivatives in Hedging Relationships [Member]
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss), net of tax	$ (8,504)	$ (14,643)	$ (18,427)	$ (14,643)

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	Sep. 30, 2023	Dec. 31, 2022
Offsetting Derivative Assets
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets	$ 16,640	$ 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	16,640	9,415
Financial Instruments, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Assets	(2,618)	0
Cash Collateral Received, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Assets	(6,230)	(2,230)
Net Amount, Offsetting of Derivative Assets	7,792	7,185
Offsetting Derivative Liabilities
Gross Amounts of Recognized Liabilities, Offsetting of Derivative Liabilities	54,255	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	54,255	44,304
Financial Instruments, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities	(2,618)	0
Cash Collateral Posted, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities	(40)	(740)
Net Amount, Offsetting of Derivative Liabilities	$ 51,597	$ 43,564

Segment Information - Additiona

Segment Information - Additional Information (Details)	9 Months Ended
	Sep. 30, 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	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net interest income	$ 138,637			$ 136,105			$ 416,136	$ 348,125
Provision for credit losses	8,426			11,593			17,884	10,775
Noninterest income	52,224			52,606			157,154	159,974
Noninterest expense	140,945			126,698			401,490	371,984
Income before income taxes	41,490			50,420			153,916	125,340
Income taxes	7,461			7,965			24,550	19,390
Net Income	34,029	$ 45,037	$ 50,300	42,455	$ 34,284	$ 29,211	129,366	105,950
Selected Financial Information
Total assets	18,390,839			17,190,634			18,390,839	17,190,634	$ 18,015,478
Depreciation and amortization	9,681			9,669			26,129	30,354
General Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	137,145			134,842			411,682	344,185
Provision for credit losses	10,646			11,595			20,015	10,785
Noninterest income	28,181			29,690			85,535	91,170
Noninterest expense	122,045			108,740			345,329	318,425
Income before income taxes	32,635			44,197			131,873	106,145
Income taxes	5,245			6,396			19,024	14,571
Net Income	27,390			37,801			112,849	91,574
Selected Financial Information
Total assets	18,099,301			16,897,083			18,099,301	16,897,083
Depreciation and amortization	9,483			9,439			25,496	29,610
Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest income	1,494			1,266			4,462	3,948
Provision for credit losses	(2,220)			(2)			(2,131)	(10)
Noninterest income	8,740			9,007			26,293	27,105
Noninterest expense	8,281			8,224			24,276	24,637
Income before income taxes	4,173			2,051			8,610	6,426
Income taxes	1,043			515			2,153	1,609
Net Income	3,130			1,536			6,457	4,817
Selected Financial Information
Total assets	194,837			205,873			194,837	205,873
Depreciation and amortization	63			71			199	217
Insurance [Member]
Segment Reporting Information [Line Items]
Net interest income	(2)			(3)			(8)	(8)
Noninterest income	15,303			13,909			45,326	41,699
Noninterest expense	10,619			9,734			31,885	28,922
Income before income taxes	4,682			4,172			13,433	12,769
Income taxes	1,173			1,054			3,373	3,210
Net Income	3,509			3,118			10,060	9,559
Selected Financial Information
Total assets	96,701			87,678			96,701	87,678
Depreciation and amortization	$ 135			$ 159			$ 434	$ 527

Accounting Policies Recently _3

Accounting Policies Recently Adopted and Pending Accounting Pronouncements - Additional Information (Details) - Accounting Standards Update 2022-02 [Member]	Sep. 30, 2023
New Accounting Pronouncements Or Change In Accounting Principle [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