10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2020

or

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                 to                

Commission file number 000-03683

Trustmark Corporation

(Exact name of registrant as specified in its charter)

Mississippi	64-0471500
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

248 East Capitol Street, Jackson, Mississippi	39201
(Address of principal executive offices)	(Zip Code)

(601) 208-5111

(Registrant’s telephone number, including area code)

Securities registered Pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, no par value	TRMK	Nasdaq Global Select Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐    No  ☒

As of April 30, 2020, there were 63,420,866 shares outstanding of the registrant’s common stock (no par value).

Forward-Looking Statements

Certain statements contained in this Quarterly Report on Form 10-Q constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995.  You can identify forward-looking statements by words such as “may,” “hope,” “will,” “should,” “expect,” “plan,” “anticipate,” “intend,” “believe,” “estimate,” “predict,” “project,” “potential,” “seek,” “continue,” “could,” “would,” “future” or the negative of those terms or other words of similar meaning.  You should read statements that contain these words carefully because they discuss our future expectations or state other “forward-looking” information.  These forward-looking statements include, but are not limited to, statements relating to anticipated future operating and financial performance measures, including net interest margin, credit quality, business initiatives, growth opportunities and growth rates, among other things, and encompass any estimate, prediction, expectation, projection, opinion, anticipation, outlook or statement of belief included therein as well as the management assumptions underlying these forward-looking statements.  You should be aware that the occurrence of the events described under the caption “Risk Factors” in Trustmark’s filings with the Securities and Exchange Commission (SEC) could have an adverse effect on our business, results of operations and financial condition.  Should one or more of these risks materialize, or should any such underlying assumptions prove to be significantly different, actual results may vary significantly from those anticipated, estimated, projected or expected.  Furthermore, many of these risks and uncertainties are currently amplified by and may continue to be amplified by or may, in the future, be amplified by, the novel coronavirus (COVID-19) pandemic, and also by the effectiveness of varying governmental responses in ameliorating the impact of the pandemic on our customers and the economies where they operate.

Risks that could cause actual results to differ materially from current expectations of Management include, but are not limited to, changes in the level of nonperforming assets and charge-offs, an increase in unemployment levels and slowdowns in economic growth, the effects of the COVID-19 pandemic on the domestic and global economy, as well as the effectiveness of actions of federal, state and local governments and agencies (including the Board of Governors of the Federal Reserve Board (FRB)) to mitigate its spread and economic impact, local, state and national economic and market conditions, conditions in the housing and real estate markets in the regions in which Trustmark operates and the extent and duration of the current volatility in the credit and financial markets, levels of and volatility in crude oil prices, changes in our ability to measure the fair value of assets in our portfolio, material changes in the level and/or volatility of market interest rates, the performance and demand for the products and services we offer, including the level and timing of withdrawals from our deposit accounts, the costs and effects of litigation and of unexpected or adverse outcomes in such litigation, our ability to attract noninterest-bearing deposits and other low-cost funds, competition in loan and deposit pricing, as well as the entry of new competitors into our markets through de novo expansion and acquisitions, economic conditions, including the potential impact of issues related to the European financial system and monetary and other governmental actions designed to address credit, securities, and/or commodity markets, the enactment of legislation and changes in existing regulations or enforcement practices or the adoption of new regulations, changes in accounting standards and practices, including changes in the interpretation of existing standards, that affect our consolidated financial statements, changes in consumer spending, borrowings and savings habits, technological changes, changes in the financial performance or condition of our borrowers, particularly with respect to the COVID-19 pandemic, changes in our ability to control expenses, greater than expected costs or difficulties related to the integration of acquisitions or new products and lines of business, cyber-attacks and other breaches which could affect our information system security, natural disasters, environmental disasters,  pandemics or other health crises, acts of war or terrorism, and other risks described in our filings with the SEC.

Although we believe that the expectations reflected in such forward-looking statements are reasonable, we can give no assurance that such expectations will prove to be correct.  Except as required by law, we undertake no obligation to update or revise any of this information, whether as the result of new information, future events or developments or otherwise.

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PART I.  FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS

Trustmark Corporation and Subsidiaries

Consolidated Balance Sheets

($ in thousands)

	(Unaudited)
	March 31, 2020		December 31, 2019
Assets
Cash and due from banks	$	404,341	$	358,916
Federal funds sold and securities purchased under reverse repurchase agreements		2,000		—
Securities available for sale, at fair value    (amortized cost: $1,791,852; allowance for credit losses: $0)		1,833,779		1,602,404
Securities held to maturity, net of allowance for credit losses of $0    (fair value: $731,441-2020; $746,202-2019)		704,276		738,099
Loans held for sale (LHFS)		325,389		226,347
Loans held for investment (LHFI) (1)		9,567,920		9,335,628
Less allowance for credit losses (ACL), LHFI (1)		100,564		84,277
Net LHFI		9,467,356		9,251,351
Acquired loans (1)		—		72,601
Less allowance for loan losses, acquired loans (1)		—		815
Net acquired loans		—		71,786
Net LHFI and acquired loans		9,467,356		9,323,137
Premises and equipment, net		190,179		189,791
Mortgage servicing rights		56,437		79,394
Goodwill		381,717		379,627
Identifiable intangible assets, net		7,537		7,343
Other real estate		24,847		29,248
Operating lease right-of-use assets		30,839		31,182
Other assets		591,132		532,389
Total Assets	$	14,019,829	$	13,497,877
Liabilities
Deposits:
Noninterest-bearing	$	2,977,058	$	2,891,215
Interest-bearing		8,598,706		8,354,342
Total deposits		11,575,764		11,245,557
Federal funds purchased and securities sold under repurchase agreements		421,821		256,020
Other borrowings		84,230		85,396
ACL on off-balance sheet credit exposures (1)		36,421		—
Junior subordinated debt securities		61,856		61,856
Operating lease liabilities		32,055		32,354
Other liabilities		155,283		155,992
Total Liabilities		12,367,430		11,837,175
Shareholders' Equity
Common stock, no par value:
Authorized:  250,000,000 shares Issued and outstanding:  63,396,912 shares - 2020; 64,200,111 shares - 2019		13,209		13,376
Capital surplus		229,403		256,400
Retained earnings		1,402,089		1,414,526
Accumulated other comprehensive income (loss), net of tax		7,698		(23,600	)
Total Shareholders' Equity		1,652,399		1,660,702
Total Liabilities and Shareholders' Equity	$	14,019,829	$	13,497,877

(1) Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

See notes to consolidated financial statements.

3

Trustmark Corporation and Subsidiaries

Consolidated Statements of Income

($ in thousands, except per share data)

(Unaudited)

	Three Months Ended March 31,
	2020		2019
Interest Income
Interest and fees on LHFS & LHFI	$	106,345	$	106,795
Interest and fees on acquired loans (1)		—		1,916
Interest on securities:
Taxable		12,948		14,665
Tax exempt		361		510
Interest on federal funds sold and securities purchased under reverse    repurchase agreements		—		2
Other interest income		740		1,603
Total Interest Income		120,394		125,491
Interest Expense
Interest on deposits		14,957		19,570
Interest on federal funds purchased and securities sold under    repurchase agreements		625		288
Other interest expense		860		825
Total Interest Expense		16,442		20,683
Net Interest Income		103,952		104,808
Provision for credit losses (PCL) (1)		20,581		1,611
Provision for loan losses, acquired loans (1)		—		78
Net Interest Income After PCL		83,371		103,119
Noninterest Income
Service charges on deposit accounts		10,032		10,265
Bank card and other fees		5,355		7,191
Mortgage banking, net		27,483		3,442
Insurance commissions		11,550		10,871
Wealth management		8,537		7,483
Other, net		2,307		2,239
Total Noninterest Income		65,264		41,491
Noninterest Expense
Salaries and employee benefits		69,148		60,954
Services and fees		19,930		16,968
Net occupancy - premises		6,286		6,454
Equipment expense		5,616		5,924
Other real estate expense, net		1,294		1,752
Credit loss expense related to off-balance sheet credit exposures (1)		6,783		—
Other expense		14,753		13,969
Total Noninterest Expense		123,810		106,021
Income Before Income Taxes		24,825		38,589
Income taxes		2,607		5,250
Net Income	$	22,218	$	33,339
Earnings Per Share
Basic	$	0.35	$	0.51
Diluted	$	0.35	$	0.51

(1) Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

See notes to consolidated financial statements.

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Trustmark Corporation and Subsidiaries

Consolidated Statements of Comprehensive Income

($ in thousands)

(Unaudited)

	Three Months Ended March 31,
	2020		2019
Net income per consolidated statements of income	$	22,218	$	33,339
Other comprehensive income (loss), net of tax:
Net unrealized gains (losses) on available for sale securities and    transferred securities:
Net unrealized holding gains (losses) arising during the    period		30,380		14,118
Change in net unrealized holding loss on securities    transferred to held to maturity		646		560
Pension and other postretirement benefit plans:
Reclassification adjustments for changes realized in net    income:
Net change in prior service costs		28		47
Recognized net loss due to lump sum settlement		—		24
Change in net actuarial loss		244		190
Derivatives:
Change in the accumulated gain (loss) on effective cash    flow hedge derivatives		—		(47	)
Reclassification adjustment for (gain) loss realized in net    income		—		(128	)
Other comprehensive income (loss), net of tax		31,298		14,764
Comprehensive income	$	53,516	$	48,103

See notes to consolidated financial statements.

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Trustmark Corporation and Subsidiaries

Consolidated Statements of Changes in Shareholders' Equity

($ in thousands, except per share data)

(Unaudited)

													Accumulated
													Other
	Common Stock												Comprehensive
	Shares						Capital			Retained			Income
	Outstanding			Amount			Surplus			Earnings			(Loss)			Total
Balance, January 1, 2020		64,200,111		$	13,376		$	256,400		$	1,414,526		$	(23,600	)	$	1,660,702
FASB ASU 2016-13 adoption adjustment		—			—			—			(19,949	)		—			(19,949	)
Net income per consolidated statements    of income		—			—			—			22,218			—			22,218
Other comprehensive income (loss), net of tax		—			—			—			—			31,298			31,298
Common stock dividends paid ($0.23 per share)		—			—			—			(14,706	)		—			(14,706	)
Shares withheld to pay taxes, long-term    incentive plan		83,759			17			(1,037	)		—			—			(1,020	)
Repurchase and retirement of common stock		(886,958	)		(184	)		(27,354	)		—			—			(27,538	)
Compensation expense, long-term    incentive plan		—			—			1,394			—			—			1,394
Balance, March 31, 2020		63,396,912		$	13,209		$	229,403		$	1,402,089		$	7,698		$	1,652,399

													Accumulated
													Other
	Common Stock												Comprehensive
	Shares						Capital			Retained			Income
	Outstanding			Amount			Surplus			Earnings			(Loss)			Total
Balance, January 1, 2019		65,834,395		$	13,717		$	309,545		$	1,323,870		$	(55,679	)	$	1,591,453
Net income per consolidated statements    of income		—			—			—			33,339			—			33,339
Other comprehensive income (loss), net of tax		—			—			—			—			14,764			14,764
Common stock dividends paid ($0.23 per share)		—			—			—			(15,033	)		—			(15,033	)
Shares withheld to pay taxes, long-term    incentive plan		123,821			25			(1,629	)		—			—			(1,604	)
Repurchase and retirement of common stock		(1,168,273	)		(243	)		(36,650	)		—			—			(36,893	)
Compensation expense, long-term    incentive plan		—			—			1,002			—			—			1,002
Balance, March 31, 2019		64,789,943		$	13,499		$	272,268		$	1,342,176		$	(40,915	)	$	1,587,028

See notes to consolidated financial statements.

6

Trustmark Corporation and Subsidiaries

Consolidated Statements of Cash Flows

($ in thousands)

(Unaudited)

	Three Months Ended March 31,
	2020			2019
Operating Activities
Net income per consolidated statements of income	$	22,218		$	33,339
Adjustments to reconcile net income to net cash provided by operating activities:
Credit loss expense, net (1)		27,364			1,689
Depreciation and amortization		8,996			9,337
Net amortization of securities		1,918			2,007
Gains on sales of loans, net		(7,085	)		(3,576	)
Compensation expense, long-term incentive plan		1,394			1,002
Deferred income tax provision		(11,600	)		(1,400	)
Proceeds from sales of loans held for sale		324,167			212,508
Purchases and originations of loans held for sale		(416,687	)		(235,550	)
Originations of mortgage servicing rights		(3,649	)		(2,507	)
Earnings on bank-owned life insurance		(1,292	)		(1,354	)
Net change in other assets		(49,822	)		(1,576	)
Net change in other liabilities		(204	)		(9,853	)
Other operating activities, net		25,119			10,806
Net cash from operating activities		(79,163	)		14,872
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity		34,459			25,361
Proceeds from maturities, prepayments and calls of securities available for sale		86,129			106,990
Purchases of securities available for sale		(278,691	)		—
Net proceeds from bank-owned life insurance		280			—
Net change in federal funds sold and securities purchased    under reverse repurchase agreements		(2,000	)		830
Net change in member bank stock		(107	)		(70	)
Net change in loans		(162,097	)		(148,108	)
Purchases of premises and equipment		(4,154	)		(4,407	)
Proceeds from sales of premises and equipment		—			1,848
Proceeds from sales of other real estate		3,671			1,780
Purchases of software		(1,805	)		(3,753	)
Investments in tax credit and other partnerships		(141	)		(3,426	)
Purchase of insurance book of business		(3,097	)		(81	)
Net cash from investing activities		(327,553	)		(23,036	)
Financing Activities
Net change in deposits		330,207			170,404
Net change in federal funds purchased and securities sold under repurchase agreements		165,801			(3,604	)
Net change in short-term borrowings		(127	)		(90	)
Payments on long-term FHLB advances		(17	)		(17	)
Payments under finance lease obligations		(459	)		(513	)
Common stock dividends		(14,706	)		(15,033	)
Repurchase and retirement of common stock		(27,538	)		(36,893	)
Shares withheld to pay taxes, long-term incentive plan		(1,020	)		(1,604	)
Net cash from financing activities		452,141			112,650
Net change in cash and cash equivalents		45,425			104,486
Cash and cash equivalents at beginning of period		358,916			349,561
Cash and cash equivalents at end of period	$	404,341		$	454,047

(1) Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

See notes to consolidated financial statements.

7

Trustmark Corporation and Subsidiaries

Notes to Consolidated Financial Statements

(Unaudited)

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 188 offices at March 31, 2020 in Alabama, Florida, Mississippi, Tennessee and Texas.  

The consolidated financial statements include the accounts of Trustmark and all other entities in which Trustmark has a controlling financial interest. All significant intercompany accounts and transactions have been eliminated in consolidation.  Certain reclassifications have been made to prior period amounts to conform to the current period presentation.  

The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X.  Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements, and notes thereto, included in Trustmark’s Annual Report on Form 10-K for its fiscal year ended December 31, 2019 (2019 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 2020 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.

Subsequent Events

On March 11, 2020, the World Health Organization declared COVID-19, the disease caused by the novel coronavirus, a pandemic as a result of the global spread of the coronavirus illness.  The COVID-19 pandemic has adversely affected, and may continue to adversely affect economic activity globally, nationally and locally. In response to the outbreak, federal and state authorities in the United States introduced various measures to try to limit or slow the spread of the virus, including travel restrictions, nonessential business closures, stay-at-home orders, and strict social distancing. The full impact of the COVID-19 pandemic is unknown and rapidly evolving. It has caused substantial disruption in international and U.S. economies, markets, and employment. The COVID-19 pandemic may have a significant adverse impact on certain industries Trustmark serves, including restaurants and food services, hotels, retail and energy.

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act), a stimulus package intended to provide relief to businesses and consumers in the United States struggling as a result of the pandemic, was signed into law. Section 4013 of the CARES Act also addressed COVID-19-related modifications and specified that COVID-19-related modifications executed between March 1, 2020 and the earlier of (i) 60 days after the date of termination of the national emergency declared by the President and (ii) December 31, 2020, on loans that were current as of December 31, 2019 are not TDRs. Additionally, under guidance from the federal banking agencies, other short-term modifications made on a good faith basis in response to COVID-19 to borrowers who were current prior to any relief are not TDRs under ASC Subtopic 310-40. These modifications include short-term (e.g., up to six months) modifications such as payment deferrals, fee waivers, extensions of repayment terms, or delays in payment that are insignificant.  Borrowers considered current are those that are less than 30 days past due on their contractual payments at the time a modification program is implemented.  Through April 23, 2020, Trustmark modified 1,978 individual loans with aggregate principal balances totaling $976.2 million. More of these types of modifications are likely to be executed in the second quarter of 2020. Commercial concessions were primarily either interest only for 90 days or full payment deferrals for 90 days.  Consumer concessions were 90-day full payment deferrals.

Because of the significant uncertainties related to the ultimate duration of the COVID-19 pandemic and its potential effects on customers and prospects, and on the national and local economy as a whole, there can be no assurances as to how the crisis may ultimately affect Trustmark’s loan portfolio.  It is unknown how long the adverse conditions associated with the COVID-19 pandemic will last and what the complete financial effect will be to Trustmark.  It is reasonably possible that estimates made in the financial statements could be materially and adversely impacted in the near term as a result of these conditions, including expected credit losses on loans and off-balance sheet credit exposures.  

8

Note 2 – Securities Available for Sale and Held to Maturity

Financial Accounting Standards Board (FASB) Accounting Standard Update (ASU) 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” was adopted by Trustmark on January 1, 2020.  ASU 2016-13 introduces the current expected credit losses methodology for estimating allowances for credit losses. ASU 2016-13 applies to all financial instruments carried at amortized cost, including securities held to maturity, and makes targeted improvements to the accounting for credit losses on securities available for sale.

Under ASU 2016-13, the allowance for credit losses is an estimate measured using relevant information about past events, including historical credit loss experience on financial assets with similar risk characteristics, current conditions, and reasonable and supportable forecasts that affect the collectability of the remaining cash flows over the contractual term of the financial assets.

In order to comply with ASU 2016-13, Trustmark conducted a review of its investment portfolio and determined that for certain classes of securities it would be appropriate to assume the expected credit loss to be zero.  This zero-credit loss assumption applies to debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government.  The reasons behind the adoption of the zero-credit loss assumption are as follows:

• High credit rating

• Long history with no credit losses

• Guaranteed by a sovereign entity

• Widely recognized as “risk-free rate”

• Can print its own currency

• Currency is routinely held by central banks, used in international commerce, and commonly viewed as reserve currency

• Currently under the U.S. Government conservatorship or receivership

Trustmark will continuously monitor any changes in economic conditions, credit downgrades, changes to explicit or implicit guarantees granted to certain debt issuers, and any other relevant information that would indicate potential credit deterioration and prompt Trustmark to reconsider its zero-credit loss assumption.

At the date of adoption, Trustmark’s estimated allowance for credit losses on securities available for sale and held to maturity under ASU 2016-13 was deemed immaterial due to the composition of these portfolios. Both portfolios consist primarily of U.S. government agency guaranteed mortgage-backed securities for which the risk of loss is minimal. Therefore, Trustmark did not recognize a cumulative effect adjustment through retained earnings related to the available for sale or held to maturity securities.

Securities Available for Sale

ASU 2016-13 makes targeted improvements to the accounting for credit losses on securities available for sale.  The concept of other-than-temporarily impaired has been replaced with the allowance for credit losses.  Unlike securities held to maturity, securities available for sale are evaluated on an individual level and pooling of securities is not allowed.  

Quarterly, Trustmark evaluates if any security has a fair value less than its amortized cost.  Once these securities are identified, in order to determine whether a decline in fair value resulted from a credit loss or other factors, Trustmark performs further analysis as outlined below:

• Review the extent to which the fair value is less than the amortized cost and observe the security’s lowest credit rating as reported by third-party credit ratings companies.

• The securities that violate the credit loss triggers above would be subjected to additional analysis that may include, but is not limited to: changes in market interest rates, changes in securities credit ratings, security type, service area economic factors, financial performance of the issuer/or obligor of the underlying issue and third-party guarantee.

• If Trustmark determines that a credit loss exists, the credit portion of the allowance will be measured using a discounted cash flow (DCF) analysis using the effective interest rate as of the security’s purchase date. The amount of credit loss Trustmark records will be limited to the amount by which the amortized cost exceeds the fair value.

9

The DCF analysis utilizes contractual maturities, as well as third-party credit ratings and cumulative default rates published annually by Moody’s Investor Service.

At March 31, 2020, the results of the analysis did not identify any securities that violate the credit loss triggers; therefore, no DCF analysis was performed and no credit loss was recognized on any of the securities available for sale.  

Accrued interest receivable is excluded from the estimate of credit losses for securities available for sale.  At March 31, 2020, accrued interest receivable totaled $4.5 million for securities available for sale and was reported in other assets on the accompanying consolidated balance sheet.

Securities Held to Maturity

ASU 2016-13 requires institutions to measure expected credit losses on financial assets carried at amortized cost on a collective or pool basis when similar risks exist.  Trustmark uses several levels of segmentation in order to measure expected credit losses:

• The portfolio is segmented into agency and non-agency securities.

• The non-agency securities are separated into municipal, mortgage, and corporate securities.

Each individual segment is categorized by third-party credit ratings.  

As discussed above, Trustmark has determined that for certain classes of securities it would be appropriate to assume the expected credit loss to be zero, which include debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government. This assumption will be reviewed and attested to quarterly.  Trustmark is using an internally built model to verify the accuracy of third-party provided calculations.  

At March 31, 2020, Trustmark’s securities held to maturity totaled $704.3 million.  The potential credit loss exposure was $31.6 million and consisted of municipal securities.  After applying appropriate probability of default and loss given default assumptions, the total amount of current expected credit losses was deemed immaterial.  Therefore, no reserve was recorded at March 31, 2020.  

Accrued interest receivable is excluded from the estimate of credit losses for securities held to maturity.  At March 31, 2020, accrued interest receivable totaled $1.7 million for securities held to maturity and was reported in other assets on the accompanying consolidated balance sheet.

At March 31, 2020, Trustmark had no securities held to maturity that were past due 30 days or more as to principal or interest payments.  Trustmark had no securities held to maturity classified as nonaccrual at March 31, 2020.  

Trustmark monitors the credit quality of securities held to maturity on a monthly basis through credit ratings.  The following table presents the amortized cost of Trustmark’s securities held to maturity by credit rating, as determined by Moody’s, at March 31, 2020 ($ in thousands):

	Securities Held to Maturity Amortized Cost
March 31, 2020
Aaa	$	672,519
Aa1 to Aa3		26,208
Not Rated (1)		5,549
Total	$	704,276

(1) Not rated securities primarily consist of Mississippi municipal general obligations.

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The following tables are a summary of the amortized cost and estimated fair value of securities available for sale and held to maturity at March 31, 2020 and December 31, 2019 ($ in thousands):

	Securities Available for Sale									Securities Held to Maturity
March 31, 2020	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. Government agency obligations	$	21,704	$	78	$	(592	)	$	21,190	$	—	$	—	$	—		$	—
Obligations of states and political    subdivisions		23,084		488		—			23,572		31,758		383		(41	)		32,100
Mortgage-backed securities
Residential mortgage pass-through    securities
Guaranteed by GNMA		70,106		1,868		(3	)		71,971		10,492		501		—			10,993
Issued by FNMA and FHLMC		949,400		18,854		(925	)		967,329		91,971		1,565		—			93,536
Other residential mortgage-backed    securities
Issued or guaranteed by FNMA,    FHLMC or GNMA		615,004		19,071		—			634,075		463,175		21,848		—			485,023
Commercial mortgage-backed securities
Issued or guaranteed by FNMA,    FHLMC or GNMA		112,554		3,109		(21	)		115,642		106,880		2,915		(6	)		109,789
Total	$	1,791,852	$	43,468	$	(1,541	)	$	1,833,779	$	704,276	$	27,212	$	(47	)	$	731,441
December 31, 2019
U.S. Government agency obligations	$	22,965	$	69	$	(707	)	$	22,327	$	3,781	$	220	$	—		$	4,001
Obligations of states and political    subdivisions		24,952		513		—			25,465		31,781		434		(53	)		32,162
Mortgage-backed securities
Residential mortgage pass-through    securities
Guaranteed by GNMA		69,196		425		(369	)		69,252		10,820		266		(10	)		11,076
Issued by FNMA and FHLMC		714,350		2,171		(3,165	)		713,356		96,631		286		(370	)		96,547
Other residential mortgage-backed    securities
Issued or guaranteed by FNMA,    FHLMC or GNMA		656,162		3,777		(1,713	)		658,226		485,324		7,026		(656	)		491,694
Commercial mortgage-backed securities
Issued or guaranteed by FNMA,    FHLMC or GNMA		113,359		625		(206	)		113,778		109,762		1,042		(82	)		110,722
Total	$	1,600,984	$	7,580	$	(6,160	)	$	1,602,404	$	738,099	$	9,274	$	(1,171	)	$	746,202

During 2013, Trustmark reclassified approximately $1.099 billion of securities available for sale to securities held to maturity.  The securities were transferred at fair value, which became the cost basis for the securities held to maturity.  At the date of transfer, the net unrealized holding loss on the available for sale securities totaled approximately $46.6 million ($28.8 million, net of tax).  The net unrealized holding loss is amortized over the remaining life of the securities as a yield adjustment in a manner consistent with the amortization or accretion of the original purchase premium or discount on the associated security.  There were no gains or losses recognized as a result of the transfer.  At March 31, 2020, the net unamortized, unrealized loss on the transferred securities included in accumulated other comprehensive income (loss) in the accompanying balance sheet totaled approximately $11.2 million ($8.4 million, net of tax) compared to approximately $12.1 million ($9.1 million, net of tax) at December 31, 2019.

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The tables below include securities with gross unrealized losses for which an allowance for credit losses has not been recorded and segregated by length of impairment at March 31, 2020 and December 31, 2019 ($ in thousands):

	Less than 12 Months					12 Months or More					Total
March 31, 2020	Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses
U.S. Government agency obligations	$	3,245	$	(23	)	$	12,708	$	(569	)	$	15,953	$	(592	)
Obligations of states and political subdivisions		—		—			6,217		(41	)		6,217		(41	)
Mortgage-backed securities
Residential mortgage pass-through securities
Guaranteed by GNMA		65		(1	)		774		(2	)		839		(3	)
Issued by FNMA and FHLMC		17,254		(136	)		55,755		(789	)		73,009		(925	)
Commercial mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or    GNMA		8,468		(17	)		672		(10	)		9,140		(27	)
Total	$	29,032	$	(177	)	$	76,126	$	(1,411	)	$	105,158	$	(1,588	)
December 31, 2019
U.S. Government agency obligations	$	6,585	$	(105	)	$	12,886	$	(602	)	$	19,471	$	(707	)
Obligations of states and political subdivisions		—		—			6,216		(53	)		6,216		(53	)
Mortgage-backed securities
Residential mortgage pass-through securities
Guaranteed by GNMA		23,544		(107	)		18,529		(272	)		42,073		(379	)
Issued by FNMA and FHLMC		112,879		(230	)		278,120		(3,305	)		390,999		(3,535	)
Other residential mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or    GNMA		158,341		(738	)		151,271		(1,631	)		309,612		(2,369	)
Commercial mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or    GNMA		51,312		(167	)		14,155		(121	)		65,467		(288	)
Total	$	352,661	$	(1,347	)	$	481,177	$	(5,984	)	$	833,838	$	(7,331	)

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 maturity. Prior to the adoption of FASB ASU 2016-13, Trustmark did not consider these investments to be other-than-temporarily impaired at March 31, 2019.  There were no other-than-temporary impairments for the three months ended 2019.

Security Gains and Losses

During the three months ended March 31, 2020 and 2019, there were no gross realized gains or losses as a result of calls and dispositions of securities.  Realized gains and losses are determined using the specific identification method and are included in noninterest income as security gains (losses), net.

Securities Pledged

Securities with a carrying value of $1.924 billion and $1.770 billion at March 31, 2020 and December 31, 2019, respectively, were pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law.  At both March 31, 2020 and December 31, 2019, none of these securities were pledged under the Federal Reserve Discount Window program to provide additional contingency funding capacity.  

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Contractual Maturities

The amortized cost and estimated fair value of securities available for sale and held to maturity at March 31, 2020, by contractual maturity, are shown below ($ in thousands).  Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Securities Available for Sale				Securities Held to Maturity
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	20,505	$	20,617	$	5,079	$	5,115
Due after one year through five years		1,304		1,317		26,679		26,985
Due after five years through ten years		2,499		2,456		—		—
Due after ten years		20,480		20,372		—		—
		44,788		44,762		31,758		32,100
Mortgage-backed securities		1,747,064		1,789,017		672,518		699,341
Total	$	1,791,852	$	1,833,779	$	704,276	$	731,441

Note 3 – LHFI and Allowance for Credit Losses, LHFI

Trustmark adopted the amendments of FASB ASU 2016-13, on January 1, 2020.  The amendments of ASU 2016-13 created FASB Accounting Standards Codification (ASC) Topic 326, “Financial Instruments – Credit Losses,” which, among other things, replace much of the guidance and disclosures previously provided in FASB ASC Topic 310, “Receivables.”  The guidance in FASB ASC Topic 326 replaces the incurred loss methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit losses.  In accordance with FASB ASC Subtopic 326-20, “Financial Instruments – Credit Losses – Measured at Amortized Cost,” Trustmark has developed an allowance for credit losses (ACL) methodology effective January 1, 2020, which replaces its previous allowance for loan losses methodology.  See the section captioned “Allowance for Credit Losses (ACL)” within this note for additional information regarding Trustmark’s ACL.  Trustmark adopted FASB ASC Topic 326 using the modified retrospective approach prescribed by the amendments of ASU 2016-13; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

At March 31, 2020 and December 31, 2019, LHFI consisted of the following ($ in thousands):

	March 31, 2020		December 31, 2019
Loans secured by real estate:
Construction, land development and other land	$	486,265	$	1,162,791
Other secured by 1-4 family residential properties		584,981		1,855,913
Secured by nonfarm, nonresidential properties		2,575,422		2,475,245
Other real estate secured		838,573		724,480
Other loans secured by real estate: (1)
Other construction		650,124		—
Secured by 1-4 family residential properties		1,267,084		—
Commercial and industrial loans		1,476,777		1,477,896
Consumer loans		173,678		175,738
State and other political subdivision loans		938,637		967,944
Other commercial loans (1)		576,379		495,621
LHFI		9,567,920		9,335,628
Less ACL		100,564		84,277
Net LHFI	$	9,467,356	$	9,251,351

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(1) In accordance with the guidance in FASB ASC Topic 326, Trustmark redefined its LHFI portfolio segments and related loan classes based on the level at which risk is monitored within the ACL methodology. The other loans secured by real estate portfolio segment and related loan classes were separated from the loans secured by real estate portfolio segment. The other construction loans were segregated from the construction, land development and other land loans. The other loans secured by 1-4 family residential properties were segregated from the loans secured by 1-4 family residential properties and the loans secured by 1-4 family residential properties were redefined in the other loans secured by real estate portfolio segment. Other loans were redefined as other commercial loans.

Accrued interest receivable is not included in the amortized cost basis of Trustmark’s LHFI.  At March 31, 2020, accrued interest receivable for LHFI totaled $30.8 million 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 March 31, 2020, 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

Past due LHFI are loans contractually past due 30 days or more as to principal or interest payments.  A LHFI is classified as nonaccrual, and the accrual of interest on such loan is discontinued, when the contractual payment of principal or interest becomes 90 days past due on commercial credits and 120 days past due on non-business purpose credits.  In addition, a credit may be placed on nonaccrual at any other time Management has serious doubts about further collectibility of principal or interest according to the contractual terms, even though the loan is currently performing.  A LHFI may remain in accrual status if it is in the process of collection and well secured.  When a LHFI is placed in nonaccrual status, interest accrued but not received is reversed against interest income.  Interest payments received on nonaccrual LHFI are applied against principal under the cost-recovery method, until qualifying for return to accrual status.  Under the cost-recovery method, interest income is not recognized until the principal balance is reduced to zero.  LHFI are restored to accrual status when the obligation is brought current or has performed in accordance with the contractual terms for a reasonable period of time and the ultimate collectibility of the total contractual principal and interest is no longer in doubt.

No material interest income was recognized in the income statement on nonaccrual LHFI for each of the periods ended March 31, 2020 and 2019.

The following table provides the amortized cost basis of loans on nonaccrual status and loans past due 90 days or more still accruing interest as of March 31, 2020 ($ in thousands):

	March 31, 2020
	Nonaccrual With No ACL		Total Nonaccrual		Loans Past Due 90 Days or More Still Accruing
Loans secured by real estate:
Construction, land development and other land	$	586	$	950	$	—
Other secured by 1-4 family residential properties		519		4,991		40
Secured by nonfarm, nonresidential properties		5,476		7,323		—
Other real estate secured		65		1,076		—
Other loans secured by real estate:
Other construction		—		—		—
Secured by 1-4 family residential properties		1,504		12,466		306
Commercial and industrial loans		18,988		21,156		—
Consumer loans		—		84		296
State and other political subdivision loans		—		4,079		—
Other commercial loans		—		867		66
Total	$	27,138	$	52,992	$	708

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The following table provides an aging analysis of the amortized cost basis of past due LHFI at March 31, 2020 ($ in thousands):

	March 31, 2020
	Past Due
	30-59 Days		60-89 Days		90 Days or More		Total Past Due		Current Loans		Total LHFI
Loans secured by real estate:
Construction, land development and other land	$	389	$	130	$	178	$	697	$	485,568	$	486,265
Other secured by 1-4 family residential properties		3,365		1,137		943		5,445		579,536		584,981
Secured by nonfarm, nonresidential properties		1,583		1,048		283		2,914		2,572,508		2,575,422
Other real estate secured		155		—		354		509		838,064		838,573
Other loans secured by real estate:
Other construction		3		—		—		3		650,121		650,124
Secured by 1-4 family residential properties		2,822		3,335		4,324		10,481		1,256,603		1,267,084
Commercial and industrial loans		1,595		327		1,543		3,465		1,473,312		1,476,777
Consumer loans		1,608		302		297		2,207		171,471		173,678
State and other political subdivision loans		—		—		4,079		4,079		934,558		938,637
Other commercial loans		454		69		480		1,003		575,376		576,379
Total	$	11,974	$	6,348	$	12,481	$	30,803	$	9,537,117	$	9,567,920

The following table provides an aging analysis of past due and nonaccrual LHFI by loan class at December 31, 2019 ($ in thousands):

	December 31, 2019
	Past Due
	30-59 Days		60-89 Days		90 Days or More (1)		Total		Nonaccrual		Current Loans		Total LHFI
Loans secured by real estate:
Construction, land development and other    land	$	380	$	256	$	—	$	636	$	897	$	1,161,258	$	1,162,791
Secured by 1-4 family residential properties		5,254		940		211		6,405		16,810		1,832,698		1,855,913
Secured by nonfarm, nonresidential    properties		1,698		—		—		1,698		7,700		2,465,847		2,475,245
Other real estate secured		8		—		—		8		1,032		723,440		724,480
Commercial and industrial loans		617		12		39		668		21,775		1,455,453		1,477,896
Consumer loans		2,208		380		392		2,980		108		172,650		175,738
State and other political subdivision loans		76		—		—		76		4,079		963,789		967,944
Other loans		152		4		—		156		825		494,640		495,621
Total	$	10,393	$	1,592	$	642	$	12,627	$	53,226	$	9,269,775	$	9,335,628

(1) Past due 90 days or more but still accruing interest.

Impaired LHFI

Prior to the adoption of FASB ASC Topic 326, Trustmark’s individually evaluated impaired LHFI included all commercial nonaccrual relationships of $500 thousand or more, which were specifically reviewed for impairment and deemed impaired, and all LHFI classified as TDRs in accordance with FASB ASC Subtopic 310-10-50-20 “Impaired Loans.”  Once a LHFI was deemed to be impaired, the full difference between book value and the most likely estimate of the collateral’s net realizable value was charged off or a specific reserve was established.

No material interest income was recognized in the income statement on impaired LHFI for the period ended March 31, 2019.

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At December 31, 2019, individually evaluated impaired LHFI consisted of the following ($ in thousands):

	December 31, 2019
	LHFI
	Unpaid Principal Balance		With No Related Allowance Recorded		With an Allowance Recorded		Total Recorded Investment		Related Allowance		Average Recorded Investment
Loans secured by real estate:
Construction, land development and other land	$	926	$	610	$	16	$	626	$	—	$	1,089
Secured by 1-4 family residential properties		6,513		2,104		3,360		5,464		35		4,713
Secured by nonfarm, nonresidential properties		7,295		1,462		5,255		6,717		2,355		8,096
Other real estate secured		69		—		68		68		—		158
Commercial and industrial loans		27,178		19,374		4,084		23,458		707		27,088
Consumer loans		22		—		21		21		—		11
State and other political subdivision loans		4,079		—		4,079		4,079		1,809		6,337
Other loans		1,207		—		784		784		553		1,033
Total	$	47,289	$	23,550	$	17,667	$	41,217	$	5,459	$	48,525

Troubled Debt Restructurings

A TDR occurs when a borrower is experiencing financial difficulties, and for related economic or legal reasons, a concession is granted to the borrower that Trustmark would not otherwise consider.  Whatever the form of concession that might be granted by Trustmark, Management’s objective is to enhance collectibility by obtaining more cash or other value from the borrower or by increasing the probability of receipt by granting the concession than by not granting it.  Other concessions may arise from court proceedings or may be imposed by law.  In addition, TDRs also include those credits that are extended or renewed to a borrower who is not able to obtain funds from sources other than Trustmark at a market interest rate for new debt with similar risk.

At March 31, 2020 and 2019, LHFI classified as TDRs totaled $26.5 million and $30.2 million, respectively, and were primarily comprised of credits with interest-only payments for an extended period of time and credits renewed at a rate that was not commensurate with that of new debt with similar risk which totaled $18.3 million and $24.8 million at March 31, 2020 and 2019, respectively.  The remaining TDRs at March 31, 2020 and 2019 resulted from bankruptcies or from payment or maturity extensions.  Trustmark had $10.7 million of unused commitments on TDRs at March 31, 2020 compared to $4.4 million of unused commitments on TDRs at March 31, 2019.  

At March 31, 2020, TDRs had a related ACL of $210 thousand, compared to a related allowance for loan loss of $2.8 million at March 31, 2019, and resulted in charge-offs of $2.2 million and $43 thousand for the three months ended March 31, 2020 and 2019, respectively.

The following table illustrates the impact of modifications classified as TDRs for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020						2019
	Number of Contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of Contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
Loans secured by real estate:
Other secured by 1-4 family residential    properties		5	$	501	$	501		2	$	86	$	86
Commercial and industrial loans		2		1,582		1,582		6		9,054		9,054
Consumer loans		4		20		20		2		30		30
Total		11	$	2,103	$	2,103		10	$	9,170	$	9,170

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The table below includes the balances at default for TDRs modified within the last 12 months for which there was a payment default during the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020				2019
	Number of Contracts		Recorded Investment		Number of Contracts		Recorded Investment
Loans secured by real estate:
Construction, land development and other land		—	$	—		1	$	22
Other secured by 1-4 family residential properties		3		446		3		684
Commercial and industrial loans		3		194		6		15,178
Consumer loans		—		—		2		28
Total		6	$	640		12	$	15,912

Trustmark’s TDRs have resulted primarily from allowing the borrower to pay interest-only for an extended period of time and credits renewed at a rate that was not commensurate with that of new debt with similar risk rather than from forgiveness.  Accordingly, as shown above, these TDRs have a similar recorded investment for both the pre-modification and post-modification disclosure.  Trustmark has utilized loans 90 days or more past due to define payment default in determining TDRs that have subsequently defaulted.

The following tables detail LHFI classified as TDRs by loan class at March 31, 2020 and 2019 ($ in thousands):

	March 31, 2020
	Accruing		Nonaccrual		Total
Loans secured by real estate:
Construction, land development and other land	$	—	$	14	$	14
Other secured by 1-4 family residential properties		—		3,672		3,672
Secured by nonfarm, nonresidential properties		—		2,899		2,899
Commercial and industrial loans		2,640		17,103		19,743
Consumer loans		17		23		40
Other commercial loans		—		125		125
Total TDRs	$	2,657	$	23,836	$	26,493

	March 31, 2019
	Accruing		Nonaccrual		Total
Loans secured by real estate:
Construction, land development and other land	$	—	$	22	$	22
Secured by 1-4 family residential properties		58		3,098		3,156
Secured by nonfarm, nonresidential properties		—		339		339
Commercial and industrial loans		13,786		12,380		26,166
Consumer loans		—		31		31
Other loans		—		518		518
Total TDRs	$	13,844	$	16,388	$	30,232

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act), a stimulus package intended to provide relief to businesses and consumers in the United States struggling as a result of the pandemic, was signed into law. Section 4013 of the CARES Act also addressed COVID-19- related modifications and specified that COVID-19- related modifications executed between March 1, 2020 and the earlier of (i) 60 days after the date of termination of the national emergency declared by the President and (ii) December 31, 2020, on loans that were current as of December 31, 2019 are not TDRs. Additionally, under guidance from the federal banking agencies, other short-term modifications made on a good faith basis in response to COVID-19 to borrowers who were current prior to any relief are not TDRs under ASC Subtopic 310-40. These modifications include short-term (e.g., up to six months) modifications such as payment deferrals, fee waivers, extensions of repayment terms, or delays in payment that are insignificant.  Borrowers considered current are those that are less than 30 days past due on their contractual payments at the time a modification program is implemented.  Trustmark modified 503 individual loans with aggregate principal balances totaling $344.3 million through March 31, 2020 without treating such modifications as TDRs.  Commercial concessions were primarily either interest only for 90 days or full payment deferrals for 90 days.  Consumer concessions were 90-day full payment deferrals.

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Collateral-Dependent Loans

The following table presents the amortized cost basis of collateral-dependent loans by class of loans and collateral type as of March 31, 2020 ($ in thousands):

	March 31, 2020
	Real Estate		Equipment and Machinery		Inventory and Receivables		Vehicles		Miscellaneous		Total
Loans secured by real estate:
Construction, land development and    other land	$	1,804	$	—	$	—	$	—	$	—	$	1,804
Other secured by 1-4 family    residential properties		519		—		—		—		—		519
Secured by nonfarm, nonresidential    properties		12,054		—		—		—		—		12,054
Other real estate secured		65		—		—		—		—		65
Other loans secured by real estate:												—
Other construction		—		—		—		—		—		—
Secured by 1-4 family residential    properties		1,504		—		—		—		—		1,504
Commercial and industrial loans		115		873		8,970		221		8,888		19,067
Consumer loans		—		—		—		—		—		—
State and other political subdivision loans		4,079		—		—		—		—		4,079
Other commercial loans		623		—		—		—		125		748
Total	$	20,763	$	873	$	8,970	$	221	$	9,013	$	39,840

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, equipment and other non-real estate collateral. There have been no significant changes to the collateral that secures these financial assets during the period.

• State and other political subdivision loans – Loans within this loan class are secured by liens on real estate properties. There have been no significant changes to the collateral that secures these financial assets during the period.

• Other loans - Loans within this loan class are secured by liens on real estate properties or priority status of a UCC agreement for non-real estate collateral. There have been no significant changes to the collateral that secures these financial assets during the period.

Credit Quality Indicators

Trustmark’s LHFI portfolio credit quality indicators focus on six key quality ratios that are compared against bank tolerances.  The loan indicators are total classified outstanding, total criticized outstanding, nonperforming loans, nonperforming assets, delinquencies and net loan losses.  Due to the homogenous nature of consumer loans, Trustmark does not assign a formal internal risk rating to each credit and therefore the criticized and classified measures are primarily composed of commercial loans.

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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 insure compliance with policy.

• Underwriting – evaluates whether credits are adequately analyzed, appropriately structured and properly approved within loan policy requirements.  A properly approved credit is approved by adequate authority in a timely manner with all conditions of approval fulfilled.  Total policy exceptions measure the level of underwriting and other policy exceptions within a portfolio segment.

• Collateral Documentation – focuses on the adequacy of documentation to perfect Trustmark’s collateral position and substantiate collateral value.  Collateral exceptions measure the level of documentation exceptions within a portfolio segment.  Collateral exceptions occur when certain collateral documentation is either not present or not current.

• Compliance with Law – focuses on underwriting, documentation, approval and reporting in compliance with banking laws and regulations.  Primary emphasis is directed to the Financial Institutions Reform, Recovery and Enforcement Act of 1989 (FIRREA), Regulation O requirements and regulations governing appraisals.

Commercial Credits

Trustmark has established a loan grading system that consists of ten individual credit risk grades (risk ratings) that encompass a range from loans where the expectation of loss is negligible to loans where loss has been established.  The model is based on the risk of default for an individual credit and establishes certain criteria to delineate the level of risk across the ten unique credit risk grades.  Credit risk grade definitions are as follows:

• Risk Rate (RR) 1 through RR 6 – Grades one through six represent groups of loans that are not subject to criticism as defined in regulatory guidance.  Loans in these groups exhibit characteristics that represent low to moderate risk measured by using a variety of credit risk criteria such as cash flow coverage, debt service coverage, balance sheet leverage, liquidity, management experience, industry position, prevailing economic conditions, support from secondary sources of repayment and other credit factors that may be relevant to a specific loan.  In general, these loans are supported by properly margined collateral and guarantees of principal parties.

• Other Assets Especially Mentioned (Special Mention) (RR 7) – a loan that has a potential weakness that if not corrected will lead to a more severe rating.  This rating is for credits that are currently protected but potentially weak because of an adverse feature or condition that if not corrected will lead to a further downgrade.

• Substandard (RR 8) – a loan that has at least one identified weakness that is well defined.  This rating is for credits where the primary sources of repayment are not viable at the time of evaluation or where either the capital or collateral is not adequate to support the loan and the secondary means of repayment do not provide a sufficient level of support to offset the identified weakness.  Loss potential exists in the aggregate amount of substandard loans but does not necessarily exist in individual loans.

• Doubtful (RR 9) – a loan with an identified weakness that does not have a valid secondary source of repayment.  Generally, these credits have an impaired primary source of repayment and secondary sources are not sufficient to prevent a loss in the credit.  The exact amount of the loss has not been determined at this time.

• Loss (RR 10) – a loan or a portion of a loan that is deemed to be uncollectible.

By definition, credit risk grades special mention (RR 7), substandard (RR 8), doubtful (RR 9) and loss (RR 10) are criticized loans while substandard (RR 8), doubtful (RR 9) and loss (RR 10) are classified loans.  These definitions are standardized by all bank regulatory agencies and are generally equally applied to each individual lending institution.  The remaining credit risk grades are considered pass credits and are solely defined by Trustmark.

To enhance this process, Trustmark has determined that loans will be individually assessed, and a formal analysis will be performed and based upon the analysis the loan will be written down to net realizable value.  Trustmark will individually assess and remove loans from the pool in the following circumstances:

• Commercial nonaccrual loans with total exposure of $500 thousand (excluding those portions of the debt that are government guaranteed or are secured by Trustmark deposits or marketable securities) or more.  

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• Commercial accruing substandard loans with total exposure of $1.0 million (excluding those portions of the debt that are government guaranteed or are secured by Trustmark deposits or marketable securities) or more will be reviewed on an individual basis to determine if the risk characteristics of the loan are indictive of the rest of the loan pool.  Any loan that is believed to not share similar risk characteristics with the rest of the pool will be individually assessed.  Otherwise, the loan will be left within the pool based on the results of the assessment.

• Commercial accruing loans deemed to be a TDR with total exposure of $500 thousand (excluding those portions of the debt that are government guaranteed or are secured by Trustmark deposits or marketable securities) or more.  If the loan is believed to not share similar risk characteristics with the rest of the loan pool, the loan will be individually assessed.  Otherwise, the loan will be left within the pool and monitored on an ongoing basis.

Each loan officer assesses the appropriateness of the internal risk rating assigned to their credits on an ongoing basis.  Trustmark’s Asset Review area conducts independent credit quality reviews of the majority of Trustmark’s commercial loan portfolio both on the underlying credit quality of each individual loan class as well as the adherence to Trustmark’s loan policy and the loan administration process.  In general, Asset Review conducts reviews of each lending area within a six- to eighteen-month window depending on the overall credit quality results of the individual area.

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 thirty days or more or on nonaccrual.  This review includes recommendations regarding risk ratings, accrual status, charge-offs and appropriate servicing officer as well as evaluation of problem credits for determination of TDRs.  Quarterly, the Credit Quality Review Committee reviews and modifies continuous action plans for all credits risk rated seven or worse for relationships of $100 thousand or more.

In addition, a semi-annual review of significant development, commercial construction, multi-family and nonowner-occupied projects is performed.  This review assesses each particular project with respect to location, project valuations, progress of completion, leasing status, current financial information, rents, operating expenses, cash flow, adherence to budget and projections and other information as applicable.  Summary results are reviewed by Senior and Regional Credit Officers in addition to the Chief Credit Officer with a determination made as to the appropriateness of existing risk ratings and accrual status.

Consumer Credits

Consumer LHFI that do not meet a minimum custom credit score are reviewed quarterly by Management.  The Retail Credit Review Committee reviews the volume and percentage of approvals that did not meet the minimum passing custom score by region, individual location, and officer to ensure that Trustmark continues to originate quality loans. 

Trustmark monitors the levels and severity of past due consumer LHFI on a daily basis through its collection activities.  A detailed assessment of consumer LHFI delinquencies is performed monthly at both a product and market level by delivery channel, which incorporates the perceived level of risk at time of underwriting. 

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The tables below present the amortized cost basis of loans by credit quality indicator and class of loans based on the most recent analysis performed ($ in thousands):

	Term Loans by Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Total
As of March 31, 2020	Commercial LHFI
Loans secured by real estate:
Construction, land development    and other land:
Pass - RR 1 through RR 6	$	77,319	$	223,340	$	54,232	$	7,319	$	4,228	$	6,771	$	36,843	$	410,052
Special Mention - RR 7		—		—		—		—		—		—		—		—
Substandard - RR 8		1,299		1,190		423		39		680		45		—		3,676
Doubtful - RR 9		—		—		—		—		—		42		—		42
Total		78,618		224,530		54,655		7,358		4,908		6,858		36,843		413,770
Other secured by 1-4 family residential    properties:
Pass - RR 1 through RR 6	$	7,746	$	32,807	$	25,192	$	13,745	$	14,504	$	10,639	$	11,512	$	116,145
Special Mention - RR 7		—		92		—		—		—		—		—		92
Substandard - RR 8		284		4,016		1,119		244		486		849		114		7,112
Doubtful - RR 9		—		37		—		—		—		—		—		37
Total		8,030		36,952		26,311		13,989		14,990		11,488		11,626		123,386
Secured by nonfarm, nonresidential    properties:
Pass - RR 1 through RR 6	$	132,966	$	542,615	$	495,056	$	407,125	$	350,006	$	474,906	$	118,137	$	2,520,811
Special Mention - RR 7		—		740		—		—		—		4,826		—		5,566
Substandard - RR 8		4,148		14,888		1,859		4,587		9,202		12,885		1,053		48,622
Doubtful - RR 9		60		—		—		—		—		341		—		401
Total		137,174		558,243		496,915		411,712		359,208		492,958		119,190		2,575,400
Other real estate secured:
Pass - RR 1 through RR 6	$	18,032	$	180,641	$	269,166	$	177,386	$	136,620	$	40,741	$	12,561	$	835,147
Special Mention - RR 7		—		—		—		—		—		—		—		—
Substandard - RR 8		—		197		1,304		—		398		843		—		2,742
Doubtful - RR 9		—		—		—		—		—		—		—		—
Total		18,032		180,838		270,470		177,386		137,018		41,584		12,561		837,889

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	Term Loans by Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Total
As of March 31, 2020	Commercial LHFI
Other loans secured by real estate:
Other construction
Pass - RR 1 through RR 6	$	20,369	$	359,717	$	203,819	$	24,199	$	23,154	$	—	$	4,645	$	635,903
Special Mention - RR 7		—		—		—		—		—		—		—		—
Substandard - RR 8		—		—		14,221		—		—		—		—		14,221
Doubtful - RR 9		—		—		—		—		—		—		—		—
Total		20,369		359,717		218,040		24,199		23,154		—		4,645		650,124
Commercial and industrial loans:
Pass - RR 1 through RR 6	$	175,477	$	294,301	$	146,947	$	115,358	$	85,992	$	59,924	$	540,814	$	1,418,813
Special Mention - RR 7		—		—		—		—		—		—		—		—
Substandard - RR 8		8,103		2,336		19,042		864		724		2,641		23,416		57,126
Doubtful - RR 9		17		540		—		—		269		4		8		838
Total		183,597		297,177		165,989		116,222		86,985		62,569		564,238		1,476,777
State and other political subdivision loans:
Pass - RR 1 through RR 6	$	30,645	$	134,410	$	76,100	$	124,088	$	147,560	$	415,156	$	805	$	928,764
Special Mention - RR 7		—		—		—		—		—		4,650		—		4,650
Substandard - RR 8		—		—		—		384		—		4,839		—		5,223
Doubtful - RR 9		—		—		—		—		—		—		—		—
Total		30,645		134,410		76,100		124,472		147,560		424,645		805		938,637
Other commercial loans:
Pass - RR 1 through RR 6	$	37,485	$	90,436	$	35,815	$	15,742	$	58,816	$	55,347	$	267,500	$	561,141
Special Mention - RR 7		—		2,028		—		—		—		—		2,995		5,023
Substandard - RR 8		—		299		698		94		1,265		—		7,747		10,103
Doubtful - RR 9		—		89		—		—		—		23		—		112
Total		37,485		92,852		36,513		15,836		60,081		55,370		278,242		576,379
Total commercial LHFI	$	513,950	$	1,884,719	$	1,344,993	$	891,174	$	833,904	$	1,095,472	$	1,028,150	$	7,592,362

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	Term Loans by Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Total
As of March 31, 2020	Consumer LHFI
Loans secured by real estate:
Construction, land development and    other land:
Current	$	4,470	$	44,148	$	14,499	$	2,531	$	1,992	$	4,557	$	—	$	72,197
Past due 30-89 days		—		—		64		52		29		43		—		188
Past due 90 days or more		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		110		—		110
Total		4,470		44,148		14,563		2,583		2,021		4,710		—		72,495
Other secured by 1-4 family residential    properties:
Current	$	5,636	$	24,558	$	17,083	$	5,225	$	2,833	$	17,902	$	380,934	$	454,171
Past due 30-89 days		—		166		111		30		58		1,384		1,870		3,619
Past due 90 days or more		—		5		—		—		—		2		34		41
Nonaccrual		83		38		211		448		—		678		2,306		3,764
Total		5,719		24,767		17,405		5,703		2,891		19,966		385,144		461,595
Secured by nonfarm, nonresidential    properties:
Current	$	—	$	—	$	—	$	—	$	—	$	16	$	—	$	16
Past due 30-89 days		—		—		—		6		—		—		—		6
Past due 90 days or more		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		—		—		—
Total		—		—		—		6		—		16		—		22
Other real estate secured:
Current	$	60	$	—	$	47	$	47	$	111	$	419	$	—	$	684
Past due 30-89 days		—		—		—		—		—		—		—		—
Past due 90 days or more		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		—		—		—
Total		60		—		47		47		111		419		—		684

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	Term Loans by Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Total
As of March 31, 2020	Consumer LHFI
Other loans secured by real estate:
Secured by 1-4 family residential properties
Current	$	42,174	$	253,904	$	251,953	$	128,603	$	140,848	$	431,984	$	—	$	1,249,466
Past due 30-89 days		—		271		2,649		123		—		1,803		—		4,846
Past due 90 days or more		—		96		148		—		—		61		—		305
Nonaccrual		—		630		2,252		788		249		8,548		—		12,467
Total		42,174		254,901		257,002		129,514		141,097		442,396		—		1,267,084
Consumer loans:
Current	$	23,790	$	53,753	$	25,875	$	10,148	$	2,751	$	1,390	$	53,694	$	171,401
Past due 30-89 days		425		469		313		89		31		9		561		1,897
Past due 90 days or more		21		12		11		—		—		—		252		296
Nonaccrual		—		17		28		27		4		8		—		84
Total		24,236		54,251		26,227		10,264		2,786		1,407		54,507		173,678
Total consumer LHFI	$	76,659	$	378,067	$	315,244	$	148,117	$	148,906	$	468,914	$	439,651	$	1,975,558
Total LHFI	$	590,609	$	2,262,786	$	1,660,237	$	1,039,291	$	982,810	$	1,564,386	$	1,467,801	$	9,567,920

The table below presents LHFI by loan class and credit quality indicator at  December 31, 2019 ($ in thousands):

	December 31, 2019
		Commercial LHFI
		Pass - Categories 1-6		Special Mention - Category 7		Substandard - Category 8		Doubtful - Category 9		Subtotal
Loans secured by real estate:
Construction, land development and other    land		$	1,075,146	$	—	$	15,726	$	42	$	1,090,914
Secured by 1-4 family residential    properties			116,592		45		6,355		41		123,033
Secured by nonfarm, nonresidential    properties			2,430,761		—		44,001		328		2,475,090
Other real estate secured			721,238		—		2,547		—		723,785
Commercial and industrial loans			1,407,837		909		68,262		888		1,477,896
Consumer loans			—		—		—		—		—
State and other political subdivision loans			957,948		4,650		5,346		—		967,944
Other loans			469,095		3,445		16,926		30		489,496
Total		$	7,178,617	$	9,049	$	159,163	$	1,329	$	7,348,158

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	Consumer LHFI
	Current		Past Due 30-89 Days		Past Due 90 Days or More		Nonaccrual		Subtotal		Total LHFI
Loans secured by real estate:
Construction, land development and other    land	$	71,413	$	332	$	—	$	132	$	71,877	$	1,162,791
Secured by 1-4 family residential    properties		1,710,930		5,922		211		15,817		1,732,880		1,855,913
Secured by nonfarm, nonresidential    properties		155		—		—		—		155		2,475,245
Other real estate secured		695		—		—		—		695		724,480
Commercial and industrial loans		—		—		—		—		—		1,477,896
Consumer loans		172,649		2,588		393		108		175,738		175,738
State and other political subdivision loans		—		—		—		—		—		967,944
Other loans		6,125		—		—		—		6,125		495,621
Total	$	1,961,967	$	8,842	$	604	$	16,057	$	1,987,470	$	9,335,628

Past Due LHFS

LHFS past due 90 days or more totaled $43.6 million and $41.6 million at March 31, 2020 and December 31, 2019, respectively.  LHFS past due 90 days or more are serviced loans eligible for repurchase, which are fully guaranteed by the Government National Mortgage Association (GNMA).  GNMA optional repurchase programs allow financial institutions to buy back individual delinquent mortgage loans that meet certain criteria from the securitized loan pool for which the institution provides servicing.  At the servicer’s option and without GNMA’s prior authorization, the servicer may repurchase such a delinquent loan for an amount equal to 100% of the remaining principal balance of the loan.  This buy-back option is considered a conditional option until the delinquency criteria are met, at which time the option becomes unconditional.  When Trustmark is deemed to have regained effective control over these loans under the unconditional buy-back option, the loans can no longer be reported as sold and must be brought back onto the balance sheet as loans held for sale, regardless of whether Trustmark intends to exercise the buy-back option.  These loans are reported as held for sale with the offsetting liability being reported as short-term borrowings.

Trustmark did not exercise its buy-back option on any delinquent loans serviced for GNMA during the first three months of 2020 or 2019.

Allowance for Credit Losses, LHFI (ACL)

Trustmark’s ACL methodology for LHFI is based upon guidance within FASB ASC Subtopic 326-20 as well as regulatory guidance from its primary regulator.  The ACL is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans.  Credit quality within the LHFI portfolio is continuously monitored by Management and is reflected within the ACL for loans.  The ACL is an estimate of expected losses inherent within Trustmark’s existing LHFI portfolio.  The ACL for LHFI is adjusted through the provision for credit losses (PCL) and reduced by the charge off of loan amounts, net of recoveries.  

The loan loss estimation process involves procedures to appropriately consider the unique characteristics of Trustmark’s LHFI portfolio segments.  These segments are further disaggregated into loan classes, the level at which credit risk is monitored.  When computing allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history, delinquency status and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future.  Evaluations of the portfolio and individual credits are inherently subjective, as they require estimates, assumptions and judgments as to the facts and circumstances of particular situations.  Determining the appropriateness of the allowance is complex and requires judgement by Management about the effect of matters that are inherently uncertain.  In future periods, evaluations of the overall LHFI portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and credit loss expense.

Trustmark estimates the ACL using relevant available information, from internal and external sources, relating to past events, current conditions and reasonable and supportable forecasts including the COVID-19 pandemic effects.  Trustmark uses a third-party software application to calculate the quantitative portion of the ACL using a methodology and assumptions specific to each loan pool.  The qualitative portion of the allowance is based on general economic conditions and other internal and external factors affecting Trustmark as a whole as well as specific LHFI.  Factors considered include the following:  lending policies and procedures, economic

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conditions and concentrations of credit, nature and volume of the portfolio, performance trends, and external factors.  The quantitative and qualitative portions of the allowance are added together to determine the total allowance for credit losses, which reflects Management’s expectations of future conditions based on reasonable and supportable forecasts.

The methodology for estimating the amount of expected credit losses reported in the ACL has two basic components: a collective, or pooled, component for estimated expected credit losses for pools of loans that share similar risk characteristics, and an asset-specific component involving individual loans that do not share risk characteristics with other loans and the measurement of expected credit losses for such individual loans.  In estimating the allowance for credit losses for the collective component, loans are segregated into loan pools based on loan product types and similar risk characteristics.

The loans secured by real estate and other loans secured by real estate portfolio segments include loans for both commercial and residential properties.  The underwriting process for these loans includes analysis of the financial position and strength of both the borrower and guarantor, experience with similar projects in the past, market demand and prospects for successful completion of the proposed project within the established budget and schedule, values of underlying collateral, availability of permanent financing, maximum loan-to-value ratios, minimum equity requirements, acceptable amortization periods and minimum debt service coverage requirements, based on property type.  The borrower’s financial strength and capacity to repay their obligations remain the primary focus of underwriting.  Financial strength is evaluated based upon analytical tools that consider historical and projected cash flows and performance in addition to analysis of the proposed project for income-producing properties.  Additional support offered by guarantors is also considered.  Ultimate repayment of these loans is sensitive to interest rate changes, general economic conditions, liquidity and availability of long-term financing.

The commercial and industrial LHFI portfolio segment includes commercial loans 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, equipment and fixed asset purchases that are secured by those assets and term financing for those within Trustmark’s geographic markets.  Trustmark’s credit underwriting process for commercial and industrial loans includes analysis of historical and projected cash flows and performance, evaluation of financial strength of both borrowers and guarantors as reflected in current and detailed financial information and evaluation of underlying collateral to support the credit.

The consumer LHFI portfolio segment is comprised of loans which are underwritten after evaluating a borrower’s capacity, credit and collateral.  Several factors are considered when assessing a borrower’s capacity, including the borrower’s employment, income, current debt, assets and level of equity in the property.  Credit is assessed using a credit report that provides credit scores and the borrower’s current and past information about their credit history.  Property appraisals are obtained to assist in evaluating collateral.  Loan-to-value and debt-to-income ratios, loan amount and lien position are also considered in assessing whether to originate a loan.  These borrowers are particularly susceptible to downturns in economic trends such as conditions that negatively affect housing prices and demand and levels of unemployment.

The state and other political subdivision LHFI and the other commercial LHFI portfolio segments primarily consist of loans to non-depository financial institutions, such as mortgage companies, finance companies and other financial intermediaries, loans to state and political subdivisions, and loans to non-profit and charitable organizations.  These loans are underwritten based on the specific nature or purpose of the loan and underlying collateral with special consideration given to the specific source of repayment for the loan.

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The following table provides a description of each of Trustmark’s portfolio segments, loan classes, loan pools and the ACL methodology and loss drivers:

Portfolio Segment	Loan Class	Loan Pool	Methodology	Loss Drivers
Loans secured by real estate	Construction, land    development and other land	1-4 family residential    construction	DCF	Prime Rate, National GDP
		Lots and development	DCF	Prime Rate, Southern Unemployment
		Unimproved land	DCF	Prime Rate, Southern Unemployment
	Other secured by 1-4    family residential    properties	Consumer 1-4 family - 1st liens	DCF	Prime Rate, Southern Unemployment
	Secured by nonfarm,    nonresidential properties	Nonowner-occupied -    hotel/motel	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied - office	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied- Retail	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied - senior    living/nursing homes	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied -    all other	DCF	Southern Vacancy Rate, Southern Unemployment
	Other real estate secured	Nonresidential nonowner    -occupied - apartments	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonresidential owner-occupied	DCF	Southern Unemployment, National GDP
Other loans secured by    real estate	Other construction	Other construction	WARM	Prime Rate, National Unemployment
	Secured by 1-4 family    residential properties	Trustmark mortgage	WARM	Southern Unemployment
Commercial and    industrial loans	Commercial and    industrial loans	Commercial and industrial -    non-working capital	DCF	Trustmark historical data
		Commercial and industrial -    working capital	DCF	Trustmark historical data
Consumer loans	Consumer loans	Credit cards	WARM	Trustmark call report data
		Overdrafts	Loss Rate	Trustmark historical data
		All other consumer	DCF	Prime Rate, Southern Unemployment
State and other political    subdivision loans	State and other political    subdivision loans	Obligations of state and    political subdivisions	DCF	Moody's Bond Default Study
Other commercial loans	Other commercial loans	Other loans	DCF	Prime Rate, Southern Unemployment

In general, Trustmark utilizes a DCF method to estimate the quantitative portion of the allowance for credit losses for loan pools.  The DCF model consists of two key components, a loss driver analysis (LDA) and a cash flow analysis.  For loan pools utilizing the DCF methodology, multiple assumptions are in place, depending on the loan pool.  A reasonable and supportable forecast is utilized for each loan pool by developing a LDA for each loan class.  The LDA uses charge off data from Federal Financial Institutions Examination Council (FFIEC) reports to construct a periodic default rate (PDR).  The PDR is decomposed into a probability of default (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 loss given default (LGD) is derived using a method referred to as Frye Jacobs.  The Frye Jacobs method is a mathematical formula that traces the relationship between LGD and PD over time and projects the LGD based on the levels of PD forecasts. This model approach is applicable to all pools within the construction, land development and other land, other secured by 1-4 family residential properties, secured by nonfarm, nonresidential properties and other real estate secured loan classes as well as the all other consumer and other loans pools.

For the commercial and industrial loans related pools, Trustmark uses its own PD and LGD data, instead of the macroeconomic variables and the Frye Jacobs method described above, to calculate the PD and LGD as there were no defensible macroeconomic variables that correlated to Trustmark’s losses.  Trustmark utilizes a third-party Bond Default Study to derive the PD and LGD for the

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obligations of state and political subdivisions pool.  Due to the lack of losses within this pool, no defensible macroeconomic factors were identified to correlate.

The PD and LGD measures are used in conjunction with prepayment data as inputs into the DCF model to calculate the cash flows at the individual loan level.  Contractual cash flows based on loan terms are adjusted for PD, LGD and prepayments to derive loss cash flows.  These loss cash flows are discounted by the loan’s coupon rate to arrive at the discounted cash flow based quantitative loss.  The prepayment studies are updated quarterly by a third-party for each applicable pool.

An alternate method of estimating the ACL is used for certain loan pools due to specific characteristics of these loans.  For the non-DCF pools, specifically, those using the weighted average remaining maturity (WARM) method, the remaining life is incorporated into the ACL quantitative calculation.

Trustmark determined that reasonable and supportable forecasts could be made for a twelve-month period for all of its loan pools.  To the extent the lives of the loans in the LHFI portfolio extend beyond this forecast period, Trustmark uses a reversion period of four quarters and reverts to the historical mean on a straight-line basis over the remaining life of the loans.  For the current period, the forecast related to the macroeconomic variables used in the quantitative modeling process were adversely affected due to the impact of COVID-19, causing an overall increase in reserve levels.  

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 two are currently considered active: economic conditions and concentrations of credit and performance trends.

Two of Trustmark’s largest loan classes are the loans secured by nonfarm, nonresidential properties and the loans secured by other real estate. Trustmark elected to create a qualitative factor specifically for these loan classes which addresses changes in the economic conditions of metropolitan areas and applies additional pool level reserves. This qualitative factor is based on third-party market data and forecast trends and is updated quarterly as information is available, by market and by loan pool.

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 ACL for individual loans that do not share risk characteristics with other loans is measured as the difference between the discounted value of expected future cash flows, based in the effective interest rate at origination, and the amortized cost basis of the loan, or the net realizable value.  The ACL is the difference between the loan’s net realizable value and its amortized cost basis (net of previous charge-offs and deferred loan fees and costs), except for collateral-dependent loans.  A loan is collateral dependent when the borrower is experiencing financial difficulty and repayment of the loan is expected to be provided substantially through the sale of the collateral.  The expected credit loss for collateral-dependent loans is measured as the difference between the amortized cost basis of the loan and the fair value of the collateral, adjusted for the estimated cost to sell.  Fair value estimates for collateral-dependent loans are derived from appraised values based on the current market value or the ‘as is’ value of the collateral, normally from recently received and reviewed appraisals.  Current appraisals are ordered on an annual basis based on the inspection date or more often if market conditions necessitate.  Appraisals are obtained from state-certified appraisers and are based on certain assumptions, which may include construction or development status and the highest and best use of the property.  These appraisals are reviewed by Trustmark’s Appraisal Review Department to ensure they are acceptable, and values are adjusted down for costs associated with asset disposal.  If the calculated expected credit loss is determined to be permanent or not recoverable, the amount of the expected credit loss is charged off.

LHFI are charged off against the ACL, with any subsequent recoveries credited back to the ACL account.  Expected recoveries may not exceed the aggregate of amounts previously charged off and expected to be charged off.  Trustmark’s loan policy dictates the guidelines to be followed in determining when a loan is charged off.  Commercial purpose LHFI are charged off when a determination is made that the loan is uncollectible and continuance as a bankable asset is not warranted.  Consumer LHFI secured by 1-4 family residential real estate are generally charged off or written down to the fair value of the collateral less cost to sell at no later than 180 days of delinquency.  Non-real estate consumer purpose LHFI, including both secured and unsecured loans, are generally charged off

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by 120 days of delinquency.  Consumer revolving lines of credit and credit card debt are generally charged off on or prior to 180 days of delinquency.

The following table disaggregates the ACL and the amortized cost basis of the loans by the measurement methodology used at March 31, 2020 ($ in thousands):

	March 31, 2020
	ACL						LHFI
	Individually Evaluated for Credit Loss		Collectively Evaluated for Credit Loss		Total ACL		Individually Evaluated for Credit Loss		Collectively Evaluated for Credit Loss		Total LHFI
Loans secured by real estate:
Construction, land development and other land	$	—	$	9,079	$	9,079	$	1,804		484,461	$	486,265
Other secured by 1-4 family residential properties		—		11,711		11,711		519		584,462		584,981
Secured by nonfarm, nonresidential properties		—		28,127		28,127		12,054		2,563,368		2,575,422
Other real estate secured		—		5,273		5,273		65		838,508		838,573
Other loans secured by real estate:
Other construction		—		7,711		7,711		—		650,124		650,124
Secured by 1-4 family residential properties		—		8,042		8,042		1,504		1,265,580		1,267,084
Commercial and industrial loans		26		14,538		14,564		19,067		1,457,710		1,476,777
Consumer loans		—		6,596		6,596		—		173,678		173,678
State and other political subdivision loans		1,809		1,632		3,441		4,079		934,558		938,637
Other commercial loans		518		5,502		6,020		748		575,631		576,379
Total	$	2,353	$	98,211	$	100,564	$	39,840	$	9,528,080	$	9,567,920

The following table disaggregates the allowance for loan losses and LHFI balances by the impairment evaluation methodology used at December 31, 2019 ($ in thousands):

	December 31, 2019
	Allowance for Loan Losses						LHFI
	Individually Evaluated		Collectively Evaluated		Total		Individually Evaluated		Collectively Evaluated		Total
Loans secured by real estate:
Construction, land development and other land	$	—	$	8,260	$	8,260	$	626	$	1,162,165	$	1,162,791
Secured by 1-4 family residential properties		35		8,897		8,932		5,464		1,850,449		1,855,913
Secured by nonfarm, nonresidential properties		2,355		23,803		26,158		6,717		2,468,528		2,475,245
Other real estate secured		—		4,024		4,024		68		724,412		724,480
Commercial and industrial loans		707		25,285		25,992		23,458		1,454,438		1,477,896
Consumer loans		—		3,379		3,379		21		175,717		175,738
State and other political subdivision loans		1,809		420		2,229		4,079		963,865		967,944
Other loans		553		4,750		5,303		784		494,837		495,621
Total	$	5,459	$	78,818	$	84,277	$	41,217	$	9,294,411	$	9,335,628

Changes in the ACL were as follows for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	84,277		$	79,290
FASB ASU 2016-13 adoption adjustments:
LHFI		(3,039	)		—
Allowance for loan losses, acquired loans transfer		815			—
Acquired loans ACL adjustment		1,007			—
Loans charged-off		(5,545	)		(4,033	)
Recoveries		2,468			2,137
Net (charge-offs) recoveries		(3,077	)		(1,896	)
PCL		20,581			1,611
Balance at end of period	$	100,564		$	79,005

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The following table details changes in the ACL by loan class for the period presented ($ in thousands):

	2020
	Balance January 1,		FASB ASU 2016-13 Adoption Adjustment			Charge-offs			Recoveries		PCL			Balance March 31,
Loans secured by real estate:
Construction, land development and other land	$	6,371	$	(188	)	$	—		$	94	$	2,802		$	9,079
Other secured by 1-4 family residential properties		5,888		4,188			(64	)		63		1,636			11,711
Secured by nonfarm, nonresidential properties		26,158		(8,179	)		(2,448	)		61		12,535			28,127
Other real estate secured		4,024		(765	)		(8	)		6		2,016			5,273
Other loans secured by real estate:
Other construction		1,889		3,202			—			19		2,601			7,711
Secured by 1-4 family residential properties		3,044		2,891			(19	)		93		2,033			8,042
Commercial and industrial loans		25,992		(8,964	)		(982	)		542		(2,024	)		14,564
Consumer loans		3,379		2,059			(690	)		473		1,375			6,596
State and other political subdivision loans		2,229		2,455			—			—		(1,243	)		3,441
Other commercial loans		5,303		2,084			(1,334	)		1,117		(1,150	)		6,020
Total	$	84,277	$	(1,217	)	$	(5,545	)	$	2,468	$	20,581		$	100,564

The increases in the PCL for loans and other loans secured by real estate and consumer loans at March 31, 2020 when compared to the January 1, 2020 adoption adjustments were primarily due to the negative impact of COVID-19 on the macroeconomic forecasting variables used in the ACL modeling, such as National and Southern Unemployment, National GDP, Prime Rate and South Vacancy Rate.

The PCL for the commercial and industrial loan portfolio decreased an additional $2.0 million during the first quarter of 2020 when compared to the January 1, 2020 adoption adjustment primarily due to loans that had been specifically reserved for being charged down as well as a slight decrease in the calculated PD and LGD, which uses Trustmark’s historical data.  The decrease in state and other political subdivision loans of $1.2 million at March 31, 2020 was primarily due to a decrease in reserves based on routine updates to the qualitative portion of the allowance calculation.  Other commercial loans decreased $1.2 million during this same period due to a pay-off which decreased needed reserves.  

The following table details changes in the allowance for loan losses, LHFI by loan class for the period presented ($ in thousands):

	2019
	Balance January 1,		Charge-offs			Recoveries		Provision for Loan Losses			Balance March 31,
Loans secured by real estate:
Construction, land development and other land loans	$	7,390	$	(35	)	$	306	$	(137	)	$	7,524
Secured by 1-4 family residential properties		8,641		(161	)		216		(315	)		8,381
Secured by nonfarm, nonresidential properties		22,376		—			15		(912	)		21,479
Other real estate secured		3,450		—			10		(383	)		3,077
Commercial and industrial loans		27,359		(1,859	)		137		3,565			29,202
Consumer loans		2,890		(793	)		534		517			3,148
State and other political subdivision loans		990		—			—		(198	)		792
Other loans		6,194		(1,185	)		919		(526	)		5,402
Total	$	79,290	$	(4,033	)	$	2,137	$	1,611		$	79,005

Note 4 – Acquired Loans

Trustmark’s loss-share agreement with the Federal Deposit Insurance Corporation (FDIC) covering the acquired covered loans secured by 1-4 family residential properties will expire in 2021.

Upon adoption of FASB ASC Topic 326, which was effective for Trustmark on January 1, 2020 in accordance with the amendments in FASB ASU 2016-13, Trustmark elected to account for its existing acquired loans as purchased credit deteriorated (PCD) loans included within the LHFI portfolio. Trustmark elected to maintain pools of loans that were previously accounted for under FASB ASC

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Subtopic 310-30, “Receivables – Loans and Debt Securities Acquired with Deteriorated Credit Quality,” and will continue to account for these pools as a unit of account.  Loans are only removed from the existing loan pools if they are written off, paid off or sold.  Upon adoption of FASB ASC Topic 326, the ACL was determined for each pool and added to the pool’s carrying value to establish a new amortized cost basis.  The difference between the unpaid principal balance of the pool and the new amortized cost basis is the noncredit premium or discount which will be amortized into interest income over the remaining life of the pool.  Changes to the allowance for credit losses after adoption of FASB ASC Topic 326 are recorded through the PCL.  Consequently, acquired loans of $72.6 million, as well as the allowance for loan losses, acquired loans of $815 thousand, were transferred on January 1, 2020.  

At December 31, 2019, acquired loans consisted of the following ($ in thousands):

	December 31, 2019
Loans secured by real estate:
Construction, land development and other land	$	4,771
Secured by 1-4 family residential properties		17,525
Secured by nonfarm, nonresidential properties		38,206
Other real estate secured		3,946
Commercial and industrial loans		5,035
Consumer loans		520
Other loans		2,598
Acquired loans		72,601
Less allowance for loan losses, acquired loans		815
Net acquired loans	$	71,786

The following table presents changes in the net carrying value of the acquired loans for the periods presented ($ in thousands):

	Acquired Impaired			Acquired Not ASC 310-30 (1)
Carrying value, net at January 1, 2019	$	102,890		$	2,811
Transfers (2)		—			(2,926	)
Accretion to interest income		5,532			115
Payments received, net		(37,230	)		—
Other (3)		178			—
Change in allowance for loan losses, acquired loans		416			—
Carrying value, net at December 31, 2019		71,786			—
FASB ASU 2016-13 adoption adjustment		(71,786	)		—
Accretion to interest income		—			—
Payments received, net		—			—
Other (3)		—			—
Change in allowance for loan losses, acquired loans		—			—
Carrying value, net at March 31, 2020	$	—		$	—

(1) “Acquired Not ASC 310-30” loans consist of loans that are not in scope for FASB ASC Subtopic 310-30.

(2) “Acquired Not ASC 310-30” loans transferred to LHFI due to the discount on these loans being fully amortized.

(3) Includes miscellaneous timing adjustments as well as acquired loan terminations through foreclosure, charge-off and other terminations.

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Under FASB ASC Subtopic 310-30, the accretable yield is the excess of expected cash flows at acquisition over the initial fair value of acquired impaired loans and is recorded as interest income over the estimated life of the loans using the effective yield method if the timing and amount of the future cash flows is reasonably estimable.  The following table presents changes in the accretable yield for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Accretable yield at beginning of period	$	(14,816	)	$	(17,722	)
FASB ASU 2016-13 adoption adjustment		14,816			—
Accretion to interest income		—			1,563
Disposals, net		—			469
Reclassification from nonaccretable difference (1)		—			(1,725	)
Accretable yield at end of period	$	—		$	(17,415	)

(1) Reclassifications from nonaccretable difference are due to lower loss expectations and improvements in expected cash flows.

The following table presents the components of the allowance for loan losses on acquired loans for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	815		$	1,231
FASB ASU 2016-13 adoption adjustment		(815	)		—
Net (charge-offs) recoveries		—			(12	)
Provision for loan losses, acquired loans		—			78
Balance at end of period	$	—		$	1,297

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The table below presents the acquired loans by loan class and credit quality indicator at December 31, 2019 ($ in thousands):

	December 31, 2019
			Commercial Loans
			Pass - Categories 1-6		Special Mention - Category 7		Substandard - Category 8		Doubtful - Category 9		Subtotal
Loans secured by real estate:
Construction, land development    and other land			$	4,022	$	—	$	192	$	—	$	4,214
Secured by 1-4 family    residential properties				3,164		42		580		—		3,786
Secured by nonfarm,    nonresidential properties				27,848		—		9,972		386		38,206
Other real estate secured				3,878		—		68		0		3,946
Commercial and industrial loans				3,419		—		—		1,616		5,035
Consumer loans				—		—		—		—		—
Other loans				2,591		—		7		—		2,598
Total acquired loans			$	44,922	$	42	$	10,819	$	2,002	$	57,785
	Consumer Loans
	Current		Past Due 30-89 Days		Past Due 90 Days or More		Nonaccrual (1)		Subtotal		Total Acquired Loans
Loans secured by real estate:
Construction, land development    and other land	$	463	$	94	$	—	$	—	$	557	$	4,771
Secured by 1-4 family    residential properties		12,843		615		281		—		13,739		17,525
Secured by nonfarm,    nonresidential properties		—		—		—		—		—		38,206
Other real estate secured		—		—		—		—		—		3,946
Commercial and industrial loans		—		—		—		—		—		5,035
Consumer loans		489		31		—		—		520		520
Other loans		—		—		—		—		—		2,598
Total acquired loans	$	13,795	$	740	$	281	$	—	$	14,816	$	72,601

(1) Acquired loans not accounted for under FASB ASC Subtopic 310-30.

The following table provides an aging analysis of contractually past due and nonaccrual acquired loans at December 31, 2019 ($ in thousands):

	December 31, 2019
	Past Due
	30-59 Days		60-89 Days		90 Days or More (1)		Total		Nonaccrual (2)		Current Loans		Total Acquired Loans
Loans secured by real estate:
Construction, land development and    other land	$	94	$	—	$	38	$	132	$	—	$	4,639	$	4,771
Secured by 1-4 family residential    properties		696		131		366		1,193		—		16,332		17,525
Secured by nonfarm, nonresidential    properties		36		—		851		887		—		37,319		38,206
Other real estate secured		1		—		52		53		—		3,893		3,946
Commercial and industrial loans		—		—		—		—		—		5,035		5,035
Consumer loans		16		15		—		31		—		489		520
Other loans		—		—		—		—		—		2,598		2,598
Total acquired loans	$	843	$	146	$	1,307	$	2,296	$	—	$	70,305	$	72,601

(1) Past due 90 days or more but still accruing interest.

(2) Acquired loans not accounted for under FASB ASC Subtopic 310-30.

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Note 5 – Mortgage Banking

Mortgage Servicing Rights

The activity in the mortgage servicing rights (MSR) is detailed in the table below for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	79,394		$	95,596
Origination of servicing assets		3,649			2,507
Change in fair value:
Due to market changes		(23,999	)		(8,863	)
Due to run-off		(2,607	)		(2,398	)
Balance at end of period	$	56,437		$	86,842

Trustmark determines the fair value of the MSR using a valuation model administered by a third party that calculates the present value of estimated future net servicing income.  Trustmark considers the conditional prepayment rate (CPR), which is an estimated loan prepayment rate that uses historical prepayment rates for previous loans similar to the loans being evaluated, and the discount rate in determining the fair value of the MSR. An increase in either the CPR or discount rate assumption will result in a decrease in the fair value of the MSR, while a decrease in either assumption will result in an increase in the fair value of the MSR.  At March 31, 2020, the fair value of the MSR included an assumed average prepayment speed of 17 CPR and an average discount rate of 9.52% compared to an assumed average prepayment speed of 10 CPR and an average discount rate of 10.04% at March 31, 2019.

Mortgage Loans Serviced/Sold

During the first three months of 2020 and 2019, Trustmark sold $317.1 million and $208.9 million, respectively, of residential mortgage loans.  Gains on these sales were recorded as noninterest income in mortgage banking, net and totaled $14.3 million for the first three months of 2020 compared to $5.0 million for the first three months of 2019. 

The table below details the mortgage loans sold and serviced for others at March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020		December 31, 2019
Federal National Mortgage Association	$	4,383,261	$	4,411,914
Government National Mortgage Association		2,685,304		2,652,782
Federal Home Loan Mortgage Corporation		69,389		73,134
Other		18,750		19,404
Total mortgage loans sold and serviced for others	$	7,156,704	$	7,157,234

Trustmark is subject to losses in its loan servicing portfolio due to loan foreclosures.  Trustmark has obligations to either repurchase the outstanding principal balance of a loan or make the purchaser whole for the economic benefits of a loan if it is determined that the loan sold was in violation of representations or warranties made by Trustmark at the time of the sale, herein referred to as mortgage loan servicing putback expenses.  Such representations and warranties typically include those made regarding loans that had missing or insufficient file documentation, loans that do not meet investor guidelines, loans in which the appraisal does not support the value and/or loans obtained through fraud by the borrowers or other third parties.  Generally, putback requests may be made until the loan is paid in full.  However, mortgage loans delivered to Federal National Mortgage Association (FNMA) and Federal Home Loan Mortgage Corporation (FHLMC) on or after January 1, 2013 are subject to the Lending and Selling Representations and Warranties Framework updated in May 2014, 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 March 31, 2020 and 2019, Trustmark had a reserve for mortgage loan servicing putback expenses of $500 thousand and $875 thousand, respectively.

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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.

Note 6 – Other Real Estate

At March 31, 2020, Trustmark’s geographic other real estate distribution was concentrated primarily in its five key market regions: Alabama, Florida, Mississippi, Tennessee and Texas.  The ultimate recovery of a substantial portion of the carrying amount of other real estate is susceptible to changes in market conditions in these areas.

For the periods presented, changes and gains (losses), net on other real estate were as follows ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	29,248		$	34,668
Additions		336			785
Disposals		(3,741	)		(1,658	)
Write-downs		(996	)		(1,656	)
Balance at end of period	$	24,847		$	32,139
Gains (losses), net on the sale of other real estate included in    other real estate expense	$	(70	)	$	122

At March 31, 2020 and December 31, 2019, other real estate by type of property consisted of the following ($ in thousands):

	March 31, 2020		December 31, 2019
Construction, land development and other land properties	$	9,816	$	11,482
1-4 family residential properties		2,499		3,453
Nonfarm, nonresidential properties		12,532		14,313
Total other real estate	$	24,847	$	29,248

At March 31, 2020 and December 31, 2019, other real estate by geographic location consisted of the following ($ in thousands):

	March 31, 2020		December 31, 2019
Alabama	$	6,229	$	8,133
Florida		4,835		5,877
Mississippi (1)		13,296		14,919
Tennessee (2)		487		319
Texas		—		—
Total other real estate	$	24,847	$	29,248

(1) Mississippi includes Central and Southern Mississippi Regions.

(2) Tennessee includes Memphis, Tennessee and Northern Mississippi Regions.

At March 31, 2020 and December 31, 2019, the balance of other real estate included $2.5 million and $3.5 million, respectively, of foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property. At March 31, 2020 and December 31, 2019, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process was $767 thousand and $953 thousand, respectively.

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Note 7 – Leases

The following table details the components of net lease cost for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Finance leases
Amortization of right-of-use assets	$	497		$	503
Interest on lease liabilities		67			81
Operating lease cost		1,290			1,300
Short-term lease cost		109			80
Variable lease cost		347			344
Sublease income		(99	)		(87	)
Net lease cost	$	2,211		$	2,221

The following table details the cash payments included in the measurement of lease liabilities during the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020		2019
Finance leases
Operating cash flows included in operating activities	$	67	$	265
Financing cash flows included in payments under finance lease obligations		459		513
Operating leases
Operating cash flows (fixed payments) included in other operating activities, net		1,246		1,246
Operating cash flows (liability reduction) included in other operating activities, net		970		941

The following table details balance sheet information, as well as weighted-average lease terms and discount rates, related to leases at March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020			December 31, 2019
Finance lease right-of-use assets, net of accumulated depreciation	$	8,829		$	9,326
Finance lease liabilities		9,061			9,520
Operating lease right-of-use assets		30,839			31,182
Operating lease liabilities		32,055			32,354
Weighted-average lease term
Finance leases	8.59 years			8.62 years
Operating leases	8.89 years			9.05 years
Weighted-average discount rate
Finance leases		3.03	%		3.01	%
Operating leases		3.48	%		3.51	%

At March 31, 2020, future minimum rental commitments under finance and operating leases were as follows ($ in thousands):

	Finance Leases			Operating Leases
2020 (excluding the three months ended March 31, 2020)	$	1,443		$	3,742
2021		1,615			4,648
2022		1,556			4,173
2023		871			4,136
2024		572			4,040
Thereafter		4,452			16,726
Total minimum lease payments		10,509			37,465
Less imputed interest		(1,448	)		(5,410	)
Lease liabilities	$	9,061		$	32,055

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Note 8 – Deposits

At March 31, 2020 and December 31, 2019, deposits consisted of the following ($ in thousands):

	March 31, 2020		December 31, 2019
Noninterest-bearing demand	$	2,977,058	$	2,891,215
Interest-bearing demand		3,400,264		3,125,914
Savings		3,602,515		3,590,509
Time		1,595,927		1,637,919
Total	$	11,575,764	$	11,245,557

Note 9 – 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 $100.6 million and $105.6 million at March 31, 2020 and December 31, 2019, respectively.  Trustmark’s repurchase agreements are transacted under master repurchase agreements that give Trustmark, in the event of default by the counterparty, the right of offset with the same counterparty.  As of March 31, 2020, all repurchase agreements were short-term and consisted primarily of sweep repurchase arrangements, under which excess deposits are “swept” into overnight repurchase agreements with Trustmark.  The following table presents the securities sold under repurchase agreements by collateral pledged at March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020		December 31, 2019
Mortgage-backed securities
Other residential mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or GNMA	$	18,461	$	24,282
Commercial mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or GNMA		29,679		29,290
Total securities sold under repurchase agreements	$	48,140	$	53,572

Note 10 – Revenue from Contracts with Customers

Trustmark accounts for revenue from contracts with customers in accordance with FASB ASC Topic 606, “Revenue from Contracts with Customers,” which provides that revenue be recognized in a manner that depicts the transfer of goods or services to a customer in an amount that reflects the consideration Trustmark expects to be entitled to in exchange for those goods or services.  Revenue from contracts with customers is recognized either over time in a manner that depicts Trustmark’s performance, or at a point in time when control of the goods or services are transferred to the customer.  Trustmark’s noninterest income, excluding all of mortgage banking, net and securities gains (losses), net and portions of bank card and other fees and other income, are considered within the scope of FASB ASC Topic 606.  Gains or losses on the sale of other real estate, which are included in Trustmark’s noninterest expense as other real estate expense, are also within the scope of FASB ASC Topic 606.

Trustmark records a gain or loss from the sale of other real estate when control of the property transfers to the buyer.  Trustmark records the gain or loss from the sale of other real estate in noninterest expense as other real estate expense, net.  Other real estate sales for the three months ended March 31, 2020 resulted in a net loss of $70 thousand, compared to a net gain of $122 thousand for the three months ended March 31, 2019.

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The following table presents noninterest income disaggregated by reportable operating segment and revenue stream for the periods presented ($ in thousands):

	Three Months Ended March 31, 2020							Three Months Ended March 31, 2019
	Topic 606		Not Topic 606 (1)			Total		Topic 606		Not Topic 606 (1)			Total
General Banking Segment
Service charges on deposit accounts	$	10,012	$	—		$	10,012	$	10,240	$	—		$	10,240
Bank card and other fees		6,726		(1,377	)		5,349		6,865		302			7,167
Mortgage banking, net		—		27,483			27,483		—		3,442			3,442
Wealth management		86		—			86		91		—			91
Other, net		1,764		482			2,246		2,244		(271	)		1,973
Total noninterest income	$	18,588	$	26,588		$	45,176	$	19,440	$	3,473		$	22,913
Wealth Management Segment
Service charges on deposit accounts	$	20	$	—		$	20	$	25	$	—		$	25
Bank card and other fees		6		—			6		24		—			24
Wealth management		8,451		—			8,451		7,392		—			7,392
Other, net		26		13			39		236		26			262
Total noninterest income	$	8,503	$	13		$	8,516	$	7,677	$	26		$	7,703
Insurance Segment
Insurance commissions	$	11,550	$	—		$	11,550	$	10,871	$	—		$	10,871
Other, net		22		—			22		4		—			4
Total noninterest income	$	11,572	$	—		$	11,572	$	10,875	$	—		$	10,875
Consolidated
Service charges on deposit accounts	$	10,032	$	—		$	10,032	$	10,265	$	—		$	10,265
Bank card and other fees		6,732		(1,377	)		5,355		6,889		302			7,191
Mortgage banking, net		—		27,483			27,483		—		3,442			3,442
Insurance commissions		11,550		—			11,550		10,871		—			10,871
Wealth management		8,537		—			8,537		7,483		—			7,483
Other, net		1,812		495			2,307		2,484		(245	)		2,239
Total noninterest income	$	38,663	$	26,601		$	65,264	$	37,992	$	3,499		$	41,491

(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.

Note 11 – 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.

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The following table presents information regarding the net periodic benefit cost for the Continuing Plan for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Service cost	$	64		$	53
Interest cost		60			90
Expected return on plan assets		(38	)		(51	)
Recognized net loss due to lump sum settlements		—			31
Recognized net actuarial loss		81			93
Net periodic benefit cost	$	167		$	216

For the plan year ending December 31, 2020, Trustmark’s minimum required contribution to the Continuing Plan is $306 thousand; however, Management and the Board of Directors of Trustmark will monitor the Continuing Plan throughout 2020 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 measurement date for the plan is December 31.  As a result of mergers prior to 2014, Trustmark became the administrator of small nonqualified supplemental retirement plans, for which the plan benefits were frozen prior to the merger date.

The following table presents information regarding the net periodic benefit cost for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020		2019
Service cost	$	19	$	27
Interest cost		414		541
Amortization of prior service cost		37		63
Recognized net actuarial loss		246		162
Net periodic benefit cost	$	716	$	793

Note 12 – Stock and Incentive Compensation

Trustmark has granted stock and incentive compensation awards and units subject to the provisions of the Stock and Incentive Compensation Plan (the Stock Plan).  Current outstanding and future grants of stock and incentive compensation awards are subject to the provisions of the Stock Plan, which is designed to provide flexibility to Trustmark regarding its ability to motivate, attract and retain the services of key associates and directors.  The Stock Plan also allows Trustmark to grant nonqualified stock options, incentive stock options, stock appreciation rights, restricted stock, restricted stock units and performance units to key associates and directors.

Restricted Stock Grants

Performance Awards

Trustmark’s performance awards vest over three years and are granted to Trustmark’s executive and senior management teams.  Performance awards granted vest based on performance goals of return on average tangible equity and total shareholder return.  Performance awards are valued utilizing a Monte Carlo simulation model to estimate fair value of the awards at the grant date.  The Monte Carlo simulation was performed by an independent valuation consultant and requires the use of subjective modeling assumptions.  These awards are recognized using the straight-line method over the requisite service period.  These awards provide for achievement shares if performance measures exceed 100%.  The restricted share agreement for these awards provides for voting rights and dividend privileges.  During 2020, Trustmark began granting performance units instead of performance awards. The performance units have the same attributes as the previously granted performance awards, except for the performance units do not provide voting rights.

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Time-Vested Awards

Trustmark’s time-vested awards vest over three years and are granted to members of Trustmark’s Board of Directors as well as Trustmark’s executive and senior management teams.  Time-vested awards are valued utilizing the fair value of Trustmark’s stock at the grant date.  These awards are recognized on the straight-line method over the requisite service period.  During 2020, Trustmark began granting time-vested units instead of time-vested awards.  The time-vested units have the same attributes as the previously granted time-vested awards, except for the time-vested units do not provide voting rights.

The following table summarize the Stock Plan activity for the periods presented:

	Three Months Ended March 31, 2020
	Performance Awards and Units			Time-Vested Awards and Units
Nonvested shares, beginning of period		149,914			300,006
Granted		53,450			115,520
Released from restriction		(36,357	)		(79,441	)
Forfeited		(19,474	)		(6,353	)
Nonvested shares, end of period		147,533			329,732

The following table presents information regarding compensation expense for awards and units under the Stock Plan for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Performance awards and units	$	(513	)	$	81
Time-vested awards and units		1,907			921
Total compensation expense	$	1,394		$	1,002

Note 13 – 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 March 31, 2020 and 2019, Trustmark had unused commitments to extend credit of $4.219 billion and $4.011 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 March 31, 2020 and 2019, Trustmark’s maximum exposure to credit loss in the event of nonperformance by the other party for letters of credit was $106.9 million and $106.5 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 March 31, 2020 and 2019, the fair value of collateral held was $25.8 million and $30.0 million, respectively.

Trustmark adopted FASB ASC Topic 326, effective January 1, 2020, which requires Trustmark to estimate expected credit losses for off-balance sheet credit exposures which are not unconditionally cancellable.  Trustmark maintains a separate ACL on off-balance sheet credit exposures, including unfunded loan commitments and letters of credit, which is included on the accompanying consolidated balance sheet as of March 31, 2020.  

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Expected credit losses for off-balance sheet credit exposures are estimated by calculating a commitment usage factor over the contractual period for exposures that are not unconditionally cancellable by Trustmark.  Trustmark generates a loan pool level unfunded amount for the period.  Trustmark views the loan pools as either closed-ended or open-ended.  Closed-ended loan pools are those that typically fund up to 100% such as other construction and nonowner-occupied.  Open-ended loan pools are those that behave similar to a revolver such as the commercial and industrial and home equity line of credit loan pools.  In addition to the unfunded balances, Trustmark uses a funding rate for loan pools that are considered open-ended.  Trustmark calculates the funding rate of the open-ended loan pools each period.  In order to mitigate volatility and incorporate historical experience in the funding rate, Trustmark uses a twelve-quarter moving average.  For the closed-ended loan pools, Trustmark takes a conservative approach and uses a 100% funding rate.  The funding rate is applied to the pool unfunded commitment balances to ensure that reserves will be applied to the pool as Trustmark believes the pool will reach its historical levels.  In addition to the funding rate being applied to the unfunded commitment balance, the total reserve rate is applied.  The total reserve rate incorporates both quantitative and qualitative aspects of the current period’s expected credit loss rate.  The total reserve rate is loan pool specific and is applied to the unfunded amount to ensure loss factors, both quantitative and qualitative, are being considered on the unfunded portion of the loan pool, consistent with the methodology applied to the funded loan pools.  

Changes in the ACL on off-balance sheet credit exposures were as follows for the period presented ($ in thousands):

	Three Months Ended
	March 31, 2020
Balance at beginning of period	$	—
FASB ASU 2016-13 adoption adjustment		29,638
Credit loss expense related to off-balance sheet credit exposures		6,783
Balance at end of period	$	36,421

Adjustments to the ACL on off-balance sheet credit exposures are recorded to credit loss expense related to off-balance sheet credit exposures in noninterest expense.  The increase in the ACL on off-balance sheet credit exposures for the first quarter of 2020 was primarily due to net changes in the economic forecast due to the negative effects of the COVID-19 pandemic on the overall economy and macroeconomic factors used in the quantitative calculation of the ACL.

No credit loss estimate is reported for off-balance sheet credit exposures that are unconditionally cancellable by Trustmark or for undrawn amounts under such arrangements that may be drawn prior to the cancellation of the arrangement.

Legal Proceedings

Trustmark’s wholly-owned subsidiary, TNB, has been named as a defendant in several lawsuits related to the collapse of the Stanford Financial Group.  

On August 23, 2009, a purported class action complaint was filed in the District Court of Harris County, Texas, by Peggy Roif Rotstain, Guthrie Abbott, Catherine Burnell, Steven Queyrouze, Jaime Alexis Arroyo Bornstein and Juan C. Olano (collectively, Class Plaintiffs), on behalf of themselves and all others similarly situated, naming TNB and four other financial institutions and one individual, each of which are unaffiliated with Trustmark, as defendants.  The complaint seeks to recover (i) alleged fraudulent transfers from each of the defendants in the amount of fees and other monies received by each defendant from entities controlled by R. Allen Stanford (collectively, the Stanford Financial Group) and (ii) damages allegedly attributable to alleged conspiracies by one or more of the defendants with the Stanford Financial Group to commit fraud and/or aid and abet fraud on the asserted grounds that defendants knew or should have known the Stanford Financial Group was conducting an illegal and fraudulent scheme.  Class Plaintiffs have demanded a jury trial.  Class Plaintiffs did not quantify damages.

In November 2009, the lawsuit was removed to federal court by certain defendants and then transferred by the United States Panel on Multidistrict Litigation to federal court in the Northern District of Texas (Dallas) where multiple Stanford related matters are being consolidated for pre-trial proceedings.  In May 2010, all defendants (including TNB) filed motions to dismiss the lawsuit.  In August 2010, the court authorized and approved the formation of an Official Stanford Investors Committee (OSIC) to represent the interests of Stanford investors and, under certain circumstances, to file legal actions for the benefit of Stanford investors.  In December 2011, the OSIC filed a motion to intervene in this action.  In September 2012, the district court referred the case to a magistrate judge for hearing and determination of certain pretrial issues.  In December 2012, the court granted the OSIC’s motion to intervene, and the OSIC filed an Intervenor Complaint against one of the other defendant financial institutions.  In February 2013, the OSIC filed a second Intervenor Complaint that asserts claims against TNB and the remaining defendant financial institutions.  The OSIC seeks to recover: (i) alleged fraudulent transfers in the amount of the fees each of the defendants allegedly received from Stanford Financial Group, the profits each of the defendants allegedly made from Stanford Financial Group deposits, and other monies each of the defendants allegedly received from Stanford Financial Group; (ii) damages attributable to alleged conspiracies by each of the

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defendants with the Stanford Financial Group to commit fraud and/or aid and abet fraud and conversion on the asserted grounds that the defendants knew or should have known the Stanford Financial Group was conducting an illegal and fraudulent scheme; and (iii) punitive damages.  The OSIC did not quantify damages.  

In July 2013, all defendants (including TNB) filed motions to dismiss the OSIC’s claims.  In March 2015, the court entered an order authorizing the parties to conduct discovery regarding class certification, staying all other discovery and setting a deadline for the parties to complete briefing on class certification issues.  In April 2015, the court granted in part and denied in part the defendants’ motions to dismiss the Class Plaintiffs’ claims and the OSIC’s claims.  The court dismissed all of the Class Plaintiffs’ fraudulent transfer claims and dismissed certain of the OSIC’s claims.  The court denied the motions by TNB and the other financial institution defendants to dismiss the OSIC’s constructive fraudulent transfer claims.  

On June 23, 2015, the court allowed the Class Plaintiffs to file a Second Amended Class Action Complaint (SAC), which asserted new claims against TNB and certain of the other defendants for (i) aiding, abetting and participating in a fraudulent scheme, (ii) aiding, abetting and participating in violations of the Texas Securities Act, (iii) aiding, abetting and participating in breaches of fiduciary duty, (iv) aiding, abetting and participating in conversion and (v) conspiracy.  On July 14, 2015, the defendants (including TNB) filed motions to dismiss the SAC and to reconsider the court’s prior denial to dismiss the OSIC’s constructive fraudulent transfer claims against TNB and the other financial institutions that are defendants in the action.  On July 27, 2016, the court denied the motion by TNB and the other financial institution defendants to dismiss the SAC and also denied the motion by TNB and the other financial institution defendants to reconsider the court’s prior denial to dismiss the OSIC’s constructive fraudulent transfer claims.  On August 24, 2016, TNB filed its answer to the SAC.  On October 20, 2017, the OSIC filed a motion seeking an order lifting the discovery stay and establishing a trial schedule.  On November 4, 2016, the OSIC filed a First Amended Intervenor Complaint, which added claims for (i) aiding, abetting or participation in violations of the Texas Securities Act and (ii) aiding, abetting or participation in the breach of fiduciary duty.  On November 7, 2017, the court denied the Class Plaintiffs’ motion seeking class certification and designation of class representatives and counsel, finding that common issues of fact did not predominate.  The court granted the OSIC’s motion to lift the discovery stay that it had previously ordered.

On May 3, 2019, individual investors and entities filed motions to intervene in the action.  On September 18, 2019, the court denied the motions to intervene.  On October 14, 2019, certain of the proposed intervenors filed a notice of appeal.

On December 14, 2009, a different Stanford-related lawsuit was filed in the District Court of Ascension Parish, Louisiana, individually by Harold Jackson, Paul Blaine and Carolyn Bass Smith, Christine Nichols, and Ronald and Ramona Hebert naming TNB (misnamed as Trust National Bank) and other individuals and entities not affiliated with Trustmark as defendants.  The complaint seeks to recover the money lost by these individual plaintiffs as a result of the collapse of the Stanford Financial Group (in addition to other damages) under various theories and causes of action, including negligence, breach of contract, breach of fiduciary duty, negligent misrepresentation, detrimental reliance, conspiracy, and violation of Louisiana’s uniform fiduciary, securities, and racketeering laws.  The complaint does not quantify the amount of money the plaintiffs seek to recover.  In January 2010, the lawsuit was removed to federal court by certain defendants and then transferred by the United States Panel on Multidistrict Litigation to federal court in the Northern District of Texas (Dallas) where multiple Stanford related matters are being consolidated for pre-trial proceedings.  On March 29, 2010, the court stayed the case.  TNB filed a motion to lift the stay, which was denied on February 28, 2012.  In September 2012, the district court referred the case to a magistrate judge for hearing and determination of certain pretrial issues.

On April 11, 2016, Trustmark learned that a different Stanford-related lawsuit had been filed on that date in the Superior Court of Justice in Ontario, Canada, by The Toronto-Dominion Bank (“TD Bank”), naming TNB and three other financial institutions not affiliated with Trustmark as defendants.  The 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 a 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.  To date, TNB has not been served in connection with this action.

On November 1, 2019, TNB was named as a defendant in a complaint filed by Paul Blaine Smith, Carolyn Bass Smith and other plaintiffs identified therein (the Smith Complaint).  The Smith Complaint was filed in District Court, Harris County, Texas and named TNB and four other financial institutions and one individual, each of which are unaffiliated with Trustmark, as defendants.  The Smith Complaint relates to the collapse of the Stanford Financial Group, as does the other pending litigation relating to Stanford summarized above.  Plaintiffs in the Smith Complaint have demanded a jury trial.

On January 15, 2020, the court granted Stanford Financial Group receiver’s motion to stay the state court action. On February 26, 2020, the lawsuit was removed to federal court in the Southern District of Texas by TNB.  Trustmark and its counsel are carefully

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evaluating the Smith Complaint in the form that is publicly available, and will update the foregoing description to the extent that additional material facts are ascertained.

TNB’s relationship with the Stanford Financial Group began as a result of Trustmark’s acquisition of a Houston-based bank in August 2006, and consisted of correspondent banking and other traditional banking services in the ordinary course of business.  All Stanford-related lawsuits are in pre-trial stages.

On December 30, 2019, a complaint was filed in the United States District Court for the Southern District of Mississippi, Northern Division (the Court) by Alysson Mills in her capacity as Court-appointed Receiver (the Receiver) for Arthur Lamar Adams (Adams) and Madison Timber Properties, LLC (Madison Timber), naming TNB, two other Mississippi-based financial institutions both of which are unaffiliated with Trustmark and two individuals, one of who was employed by TNB at all times relevant to the complaint and the other was employed either by TNB or one of the other defendant financial institutions, as defendants.  The complaint seeks to recover from the defendants, for the benefit of the receivership estate and also for certain investors who were allegedly defrauded by Adams and Madison Timber, damages (including punitive damages) and related costs allegedly attributable to actions of the defendants that allegedly enabled illegal and fraudulent activities engaged in by Adams and Madison Timber.  The Receiver did not quantify damages.

TNB’s relationship with Adams and Madison Timber consisted of traditional banking services in the ordinary course of business.

Trustmark and its subsidiaries are also parties to other lawsuits and other claims that arise in the ordinary course of business.  Some of the lawsuits assert claims related to the lending, collection, servicing, investment, trust and other business activities, and some of the lawsuits allege substantial claims for damages.

All pending legal proceedings described above are being vigorously contested.  In accordance with FASB ASC Subtopic 450-20, “Loss Contingencies,” Trustmark will establish an accrued liability for litigation matters when those matters present loss contingencies that are both probable and reasonably estimable.  At the present time, Trustmark believes, based on its evaluation and the advice of legal counsel, that a loss in any such proceeding is not probable and a reasonable estimate cannot reasonably be made.

Note 14 – 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 March 31,
	2020		2019
Basic shares		63,757		65,239
Dilutive shares		157		140
Diluted shares		63,914		65,379

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 March 31,
	2020		2019
Weighted-average antidilutive stock awards		52		55

Note 15 – Statements of Cash Flows

The following table reflects specific transaction amounts for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020		2019
Interest expense paid on deposits and borrowings	$	16,807	$	20,501
Noncash transfers from loans to other real estate		336		785
Securities purchased not settled		—		1,095
Finance right-of-use assets resulting from lease liabilities		—		11,230
Operating right-of-use assets resulting from lease liabilities		671		33,861

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Note 16 – 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 2019 Annual Report, which are administered by the federal bank regulatory agencies.  These capital requirements, as defined by federal regulations, involve quantitative and qualitative measures of assets, liabilities and certain off-balance sheet instruments.  Trustmark’s and TNB’s minimum risk-based capital requirements include a capital conservation buffer of 2.50% at March 31, 2020 and December 31, 2019.  Accumulated other comprehensive income (loss), net of tax, is not included in computing regulatory capital.  Trustmark has elected the five-year phase-in transition period 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 March 31, 2020, Trustmark and TNB exceeded all applicable minimum capital standards.  In addition, Trustmark and TNB met applicable regulatory guidelines to be considered well-capitalized at March 31, 2020.  To be categorized in this manner, Trustmark and TNB maintained minimum common equity Tier 1 risk-based capital, Tier 1 risk-based capital, total risk-based capital and Tier 1 leverage ratios as set forth in the accompanying table, and were not subject to any written agreement, order or capital directive, or prompt corrective action directive issued by their primary federal regulators to meet and maintain a specific capital level for any capital measures.  There are no significant conditions or events that have occurred since March 31, 2020, which Management believes have affected Trustmark’s or TNB’s present classification.

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The following table provides Trustmark’s and TNB’s actual regulatory capital amounts and ratios under regulatory capital standards in effect at March 31, 2020 and December 31, 2019 ($ in thousands):

	Actual
	Regulatory Capital					Minimum			To Be Well
	Amount		Ratio			Requirement			Capitalized
At March 31, 2020:
Common Equity Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,297,083		11.35	%		7.00	%	n/a
Trustmark National Bank		1,336,080		11.69	%		7.00	%		6.50	%
Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,357,083		11.88	%		8.50	%	n/a
Trustmark National Bank		1,336,080		11.69	%		8.50	%		8.00	%
Total Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,460,942		12.78	%		10.50	%	n/a
Trustmark National Bank		1,439,939		12.60	%		10.50	%		10.00	%
Tier 1 Leverage (to Average Assets)
Trustmark Corporation	$	1,357,083		10.21	%		4.00	%	n/a
Trustmark National Bank		1,336,080		10.07	%		4.00	%		5.00	%
At December 31, 2019:
Common Equity Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,312,668		11.93	%		7.00	%	n/a
Trustmark National Bank		1,352,893		12.30	%		7.00	%		6.50	%
Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,372,668		12.48	%		8.50	%	n/a
Trustmark National Bank		1,352,893		12.30	%		8.50	%		8.00	%
Total Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,457,760		13.25	%		10.50	%	n/a
Trustmark National Bank		1,437,985		13.07	%		10.50	%		10.00	%
Tier 1 Leverage (to Average Assets)
Trustmark Corporation	$	1,372,668		10.48	%		4.00	%	n/a
Trustmark National Bank		1,352,893		10.35	%		4.00	%		5.00	%

Stock Repurchase Program

On March 11, 2016, the Board of Directors of Trustmark authorized a stock repurchase program under which $100.0 million of Trustmark’s outstanding common stock could be acquired through March 31, 2019.  Trustmark repurchased approximately 1.2 million shares of its common stock valued at $36.9 million during the three months ended March 31, 2019.  Under this authority, Trustmark repurchased approximately 3.2 million shares valued at $100.0 million.  

On April 1, 2019, the Board of Directors of Trustmark authorized a stock repurchase program under which $100.0 million of Trustmark’s outstanding common stock could be acquired through March 31, 2020.  Trustmark repurchased approximately 887 thousand shares of its common stock valued at $27.5 million during the three months ended March 31, 2020. Under this authority, Trustmark repurchased approximately 1.5 million shares valued at $47.2 million.

On January 28, 2020, the Board of Directors of Trustmark authorized a new stock repurchase program, effective April 1, 2020, under which $100.0 million of Trustmark’s outstanding common stock may be acquired through December 31, 2021.  The shares may be purchased from time to time at prevailing market prices, through open market or private transactions, depending on market conditions.  There is no guarantee as to the number of shares that may be repurchased by Trustmark, and Trustmark may discontinue purchases under the program at any time at Management’s discretion.

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On March 9, 2020, Trustmark suspended its share repurchase programs to preserve capital to support customers during the COVID-19 pandemic.

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 11 – 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 derivative are included in other interest expense in the accompanying consolidated statements of income.

	Three Months Ended March 31, 2020							Three Months Ended March 31, 2019
	Before Tax Amount		Tax (Expense) Benefit			Net of Tax Amount		Before Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Securities available for sale and transferred securities:
Net unrealized holding gains (losses) arising    during the period	$	40,507	$	(10,127	)	$	30,380	$	18,824		$	(4,706	)	$	14,118
Change in net unrealized holding loss on    securities transferred to held to maturity		861		(215	)		646		747			(187	)		560
Total securities available for sale    and transferred securities		41,368		(10,342	)		31,026		19,571			(4,893	)		14,678
Pension and other postretirement benefit plans:
Reclassification adjustments for changes realized    in net income:
Net change in prior service costs		37		(9	)		28		63			(16	)		47
Recognized net loss due to lump sum    settlements		—		—			—		31			(7	)		24
Change in net actuarial loss		326		(82	)		244		255			(65	)		190
Total pension and other postretirement benefit    plans		363		(91	)		272		349			(88	)		261
Cash flow hedge derivatives:
Change in accumulated gain (loss) on effective    cash flow hedge derivatives		—		—			—		(63	)		16			(47	)
Reclassification adjustment for (gain) loss realized    in net income		—		—			—		(171	)		43			(128	)
Total cash flow hedge derivatives		—		—			—		(234	)		59			(175	)
Total other comprehensive income (loss)	$	41,731	$	(10,433	)	$	31,298	$	19,686		$	(4,922	)	$	14,764

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The following table presents the changes in the balances of each component of accumulated other comprehensive income (loss) for the periods presented ($ in thousands).  All amounts are presented net of tax.

	Securities Available for Sale and Transferred Securities			Defined Benefit Pension Items			Cash Flow Hedge Derivatives			Total
Balance at January 1, 2020	$	(8,017	)	$	(15,583	)	$	—		$	(23,600	)
Other comprehensive income (loss) before reclassification		31,026			—			—			31,026
Amounts reclassified from accumulated other    comprehensive income (loss)		—			272			—			272
Net other comprehensive income (loss)		31,026			272			—			31,298
Balance at March 31, 2020	$	23,009		$	(15,311	)	$	—		$	7,698
Balance at January 1, 2019	$	(43,824	)	$	(12,324	)	$	469		$	(55,679	)
Other comprehensive income (loss) before reclassification		14,678			—			(47	)		14,631
Amounts reclassified from accumulated other    comprehensive income (loss)		—			261			(128	)		133
Net other comprehensive income (loss)		14,678			261			(175	)		14,764
Balance at March 31, 2019	$	(29,146	)	$	(12,063	)	$	294		$	(40,915	)

Note 17 – 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 market place.

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.

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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 as of March 31, 2020 and December 31, 2019, 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 three months ended March 31, 2020 and the year ended December 31, 2019.

	March 31, 2020
	Total		Level 1		Level 2		Level 3
U.S. Government agency obligations	$	21,190	$	—	$	21,190	$	—
Obligations of states and political subdivisions		23,572		—		23,572		—
Mortgage-backed securities		1,789,017		—		1,789,017		—
Securities available for sale		1,833,779		—		1,833,779		—
Loans held for sale		325,389		—		325,389		—
Mortgage servicing rights		56,437		—		—		56,437
Other assets - derivatives		72,664		21,575		41,263		9,826
Other liabilities - derivatives		12,624		221		12,403		—

	December 31, 2019
	Total		Level 1		Level 2		Level 3
U.S. Government agency obligations	$	22,327	$	—	$	22,327	$	—
Obligations of states and political subdivisions		25,465		—		25,465		—
Mortgage-backed securities		1,554,612		—		1,554,612		—
Securities available for sale		1,602,404		—		1,602,404		—
Loans held for sale		226,347		—		226,347		—
Mortgage servicing rights		79,394		—		—		79,394
Other assets - derivatives		17,956		244		16,273		1,439
Other liabilities - derivatives		6,063		4,414		1,649		—

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The changes in Level 3 assets measured at fair value on a recurring basis for the three months ended March 31, 2020 and 2019 are summarized as follows ($ in thousands):

	MSR			Other Assets - Derivatives
Balance, January 1, 2020	$	79,394		$	1,439
Total net (loss) gain included in Mortgage banking, net (1)		(26,606	)		9,606
Additions		3,649			—
Sales		—			(1,219	)
Balance, March 31, 2020	$	56,437		$	9,826
The amount of total gains (losses) for the period included in earnings    that are attributable to the change in unrealized gains or    losses still held at March 31, 2020	$	(23,999	)	$	4,428
Balance, January 1, 2019	$	95,596		$	1,187
Total net (loss) gain included in Mortgage banking, net (1)		(11,261	)		1,574
Additions		2,507			—
Sales		—			(996	)
Balance, March 31, 2019	$	86,842		$	1,765
The amount of total gains (losses) for the period included in    earnings that are attributable to the change in unrealized    gains or losses still held at March 31, 2019	$	(8,863	)	$	382

(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 March 31, 2020, 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 March 31, 2020, Trustmark had outstanding balances of $39.8 million with a related ACL of $2.4 million in collateral-dependent LHFI.  At December 31, 2019, Trustmark had outstanding balances of $41.2 million with a related allowance of $5.5 million in impaired LHFI that were individually evaluated for impairment and written down to the fair value of the underlying collateral less cost to sell based on the fair value of the collateral or other unobservable input compared.  Both the collateral-dependent LHFI and the individually evaluated impaired 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 carried at the lower of cost or estimated fair value.  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.

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Foreclosed assets of $3.1 million were remeasured during the first three months of 2020, requiring write-downs of $357 thousand to reach their current fair values compared to $5.7 million of foreclosed assets that were remeasured during the first three months of 2019, requiring write-downs of $990 thousand.

Fair Value of Financial Instruments

FASB ASC Topic 825, “Financial Instruments,” requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis.

The carrying amounts and estimated fair values of financial instruments at March 31, 2020 and December 31, 2019, are as follows ($ in thousands):

	March 31, 2020				December 31, 2019
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Financial Assets:
Level 2 Inputs:
Cash and short-term investments	$	406,341	$	406,341	$	358,916	$	358,916
Securities held to maturity		704,276		731,441		738,099		746,202
Level 3 Inputs:
Net LHFI		9,467,356		9,465,548		9,251,351		9,235,674
Net acquired loans (1)		—		—		71,786		71,786
Financial Liabilities:
Level 2 Inputs:
Deposits		11,575,764		11,584,178		11,245,557		11,250,071
Federal funds purchased and securities sold under    repurchase agreements		421,821		421,821		256,020		256,020
Other borrowings		84,230		84,227		85,396		85,374
Junior subordinated debt securities		61,856		46,392		61,856		50,722

(1) Upon adoption of FASB ASC Topic 326 at January 1, 2020, Trustmark elected to account for its existing acquired loans as purchased credit deteriorated loans included within the LHFI portfolio.  See Note 4 – Acquired Loans for additional details.

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 months ended March 31, 2020, a net gain of $7.7 million was recorded as noninterest income in mortgage banking, net for changes in the fair value of LHFS accounted for under the fair value option, compared to a net gain of $668 thousand for the three months ended March 31, 2019.  Interest and fees on LHFS and LHFI for the three months ended March 31, 2020 included $1.3 million of interest earned on LHFS accounted for under the fair value option, compared to $1.0 million for the three months ended March 31, 2019, 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 $56.5 million and $57.1 million at March 31, 2020 and December 31, 2019, respectively, and are included in LHFS on the accompanying consolidated balance sheets.  For additional information regarding GNMA optional repurchase loans, please see the section captioned “Past Due LHFS” included in Note 3 – LHFI and Allowance for Credit Losses, LHFI.

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The following table provides information about the fair value and the contractual principal outstanding of LHFS accounted for under the fair value option as of March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020		December 31, 2019
Fair value of LHFS	$	268,891	$	169,285
LHFS contractual principal outstanding		256,314		164,420
Fair value less unpaid principal	$	12,577	$	4,865

Note 18 – Derivative Financial Instruments

Derivatives Designated as Hedging Instruments

On April 4, 2013, Trustmark entered into a forward interest rate swap contract on junior subordinated debentures with a total notional amount of $60.0 million.  The interest rate swap contract was designated as a derivative instrument in a cash flow hedge under FASB ASC Topic 815, “Derivatives and Hedging,” with the objective of protecting the quarterly interest payments on Trustmark’s $60.0 million of junior subordinated debentures issued to Trustmark Preferred Capital Trust I throughout the five-year period which began December 31, 2014 and ended December 31, 2019 from the risk of variability of those payments resulting from changes in the three-month LIBOR interest rate.  Under the swap, which became effective on December 31, 2014, Trustmark paid a fixed interest rate of 1.66% and received a variable interest rate based on three-month LIBOR on a total notional amount of $60.0 million, with quarterly net settlements.

The interest rate swap matured on December 31, 2019; therefore, there was no accumulated net after-tax amount related to the effective cash flow hedge included in accumulated other comprehensive income (loss) at December 31, 2019.  No ineffectiveness related to the interest rate swap designated as a cash flow hedge was recognized in the consolidated statements of income for the three months ended March 31, 2019.  Amounts reported in accumulated other comprehensive income (loss) related to this derivative were reclassified to other interest expense as interest payments were made on Trustmark’s variable rate junior subordinated debentures.

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 $516.5 million at March 31, 2020 compared to $564.0 million at December 31, 2019.  Changes in the fair value of these exchange-traded derivative instruments are recorded as noninterest income in mortgage banking, net and are offset by changes in the fair value of the MSR.  The impact of this strategy resulted in a net positive ineffectiveness of $9.9 million and a net negative ineffectiveness of $4.7 million for the three months ended March 31, 2020 and 2019, 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 $454.5 million at March 31, 2020, with a negative valuation adjustment of $9.3 million, compared to $209.0 million, with a negative valuation adjustment of $486 thousand, at December 31, 2019.

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 $382.2 million at March 31, 2020, with a positive valuation adjustment of $9.8 million, compared to $92.1 million, with a positive valuation adjustment of $1.4 million, as of December 31, 2019.

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 nonperformance risk, the changes in fair value are expected to substantially offset.  As of March 31, 2020, Trustmark had interest rate swaps with an aggregate notional amount of $905.6 million related to this program, compared to $893.1 million as of December 31, 2019.

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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.

As of March 31, 2020 and December 31, 2019, the termination value of interest rate swaps in a liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $2.8 million and $1.0 million, respectively.  As of March 31, 2020, Trustmark had posted collateral of $2.8 million against its obligations because of negotiated thresholds and minimum transfer amounts under these agreements.  If Trustmark had breached any of these triggering provisions at March 31, 2020, 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 both March 31, 2020 and December 31, 2019, Trustmark had entered into three risk participation agreements as a beneficiary with an aggregate notional amount of $37.2 million and $37.6 million, respectively.  Trustmark had entered into nine risk participation agreements as a guarantor with an aggregate notional amount of $74.9 million at March 31, 2020 compared to ten risk participation agreements as a guarantor with an aggregate notional amount of $79.3 million at December 31, 2019.  The aggregate fair values of these risk participation agreements were immaterial at March 31, 2020 and December 31, 2019.

Tabular Disclosures

The following tables disclose the fair value of derivative instruments in Trustmark’s consolidated balance sheets as of March 31, 2020 and December 31, 2019 as well as the effect of these derivative instruments on Trustmark’s results of operations for the periods presented ($ in thousands):

	March 31, 2020		December 31, 2019
Derivatives not designated as hedging instruments
Interest rate contracts:
Futures contracts included in other assets	$	13,637	$	—
Exchange traded purchased options included in other assets		7,938		244
OTC written options (rate locks) included in other assets		9,826		1,439
Interest rate swaps included in other assets		41,154		16,209
Credit risk participation agreements included in other assets		109		64
Futures contracts included in other liabilities		—		2,654
Forward contracts included in other liabilities		9,318		486
Exchange traded written options included in other liabilities		221		1,760
Interest rate swaps included in other liabilities		2,960		1,122
Credit risk participation agreements included in other liabilities		125		41

	Three Months Ended March 31,
	2020			2019
Derivatives in hedging relationships
Amount of gain (loss) reclassified from accumulated other    comprehensive income (loss) and recognized in other interest expense	$	—		$	171
Derivatives not designated as hedging instruments
Amount of gain (loss) recognized in mortgage banking, net	$	33,486		$	4,853
Amount of gain (loss) recognized in bank card and other fees		(1,660	)		(256	)

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 March 31,
	2020		2019
Derivatives in cash flow hedging relationship
Amount of gain (loss) recognized in other comprehensive    income (loss), net of tax	$	—	$	(47	)

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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 March 31, 2020 and December 31, 2019 is presented in the following tables ($ in thousands):

Offsetting of Derivative Assets
As of March 31, 2020
							Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets presented in the Statement of Financial Position		Financial Instruments			Cash Collateral Received		Net Amount
Derivatives	$	41,154	$	—	$	41,154	$	(1	)	$	—	$	41,153

Offsetting of Derivative Liabilities
As of March 31, 2020
							Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities presented in the Statement of Financial Position		Financial Instruments			Cash Collateral Posted			Net Amount
Derivatives	$	2,960	$	—	$	2,960	$	(1	)	$	(2,820	)	$	139

Offsetting of Derivative Assets
As of December 31, 2019
							Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets presented in the Statement of Financial Position		Financial Instruments		Cash Collateral Received		Net Amount
Derivatives	$	16,209	$	—	$	16,209	$	—	$	—	$	16,209

Offsetting of Derivative Liabilities
As of December 31, 2019
							Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities presented in the Statement of Financial Position		Financial Instruments		Cash Collateral Posted			Net Amount
Derivatives	$	1,122	$	—	$	1,122	$	—	$	(1,390	)	$	(268	)

Note 19 – 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 22 – Segment Information included in Part II. Item 8. – Financial Statements and Supplementary Data, of Trustmark’s 2019 Annual Report.  During the first quarter of 2020, Trustmark revised the composition of its operating segments by moving the Retail Private Banking Group from the General Banking Segment to the Wealth Management Segment as a result of a change in supervision of this group for segment reporting purposes. The prior period amounts presented include reclassifications to conform to the current period presentation.

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.

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The following table discloses financial information by reportable segment for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
General Banking
Net interest income	$	102,403		$	103,005
Provision for credit losses		18,374			1,693
Noninterest income		45,176			22,913
Noninterest expense		106,450			90,015
Income before income taxes		22,755			34,210
Income taxes		2,091			4,155
General banking net income	$	20,664		$	30,055
Selected Financial Information
Total assets	$	13,663,877		$	13,077,106
Depreciation and amortization	$	8,794		$	9,139
Wealth Management
Net interest income	$	1,504		$	1,748
Provision for credit losses		2,207			(4	)
Noninterest income		8,516			7,703
Noninterest expense		8,516			7,663
Income before income taxes		(703	)		1,792
Income taxes		(176	)		444
Wealth management net income	$	(527	)	$	1,348
Selected Financial Information
Total assets	$	280,181		$	329,319
Depreciation and amortization	$	67		$	69
Insurance
Net interest income	$	45		$	55
Noninterest income		11,572			10,875
Noninterest expense		8,844			8,343
Income before income taxes		2,773			2,587
Income taxes		692			651
Insurance net income	$	2,081		$	1,936
Selected Financial Information
Total assets	$	75,771		$	71,592
Depreciation and amortization	$	135		$	129
Consolidated
Net interest income	$	103,952		$	104,808
Provision for credit losses		20,581			1,689
Noninterest income		65,264			41,491
Noninterest expense		123,810			106,021
Income before income taxes		24,825			38,589
Income taxes		2,607			5,250
Consolidated net income	$	22,218		$	33,339
Selected Financial Information
Total assets	$	14,019,829		$	13,478,017
Depreciation and amortization	$	8,996		$	9,337

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Note 20 – 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 2018-15, “Intangibles-Goodwill and Other–Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force).”  Issued in August 2018, ASU 2018-15 aims to reduce complexity in the accounting for costs of implementing a cloud computing service arrangement.  ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license).  The amendments of ASU 2018-15 require an entity to follow the guidance in FASB ASC Subtopic 350-40, “Intangibles-Goodwill and Other-Internal-Use Software,” in order to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense.  The amendments of ASU 2018-15 also require an entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement (i.e. the noncancellable period of the arrangement plus periods covered by (1) an option to extend the arrangement if the entity is reasonably certain to exercise that option, (2) an option to terminate the arrangement if the entity is reasonably certain not to exercise the option, and (3) an option to extend (or not to terminate) the arrangement in which exercise of the option is in the control of the vendor).  ASU 2018-15 also requires an entity to present the expense related to the capitalized implementation costs in the same line item in the statement of income as the fees associated with the hosting element (service) of the arrangement, and to classify payments for capitalized implementation costs in the statement of cash flows in the same manner as payments made for fees associated with the hosting element.  ASU 2018-15 became effective for Trustmark on January 1, 2020.  Trustmark does not currently have any material amount of implementation costs related to hosting arrangements that are service contracts within the scope of this ASU; therefore, adoption of ASU 2018-15 did not impact Trustmark’s consolidated financial statements.

ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement.”  Issued in August 2018, the amendments in this ASU remove disclosure requirements in FASB ASC Topic 820 related to (1) the amount of, and reasons for, transfers between Level 1 and Level 2 of the fair value hierarchy; (2) the policy for timing of transfers between levels; (3) the valuation processes for Level 3 fair value measurements; and (4) for non-public entities, the changes in unrealized gains and losses for the period included in earnings for recurring Level 3 fair value measurements held at the end of the reporting period. The ASU also modifies disclosure requirements such that (1) in place of a rollforward for Level 3 fair value measurements, a non-public entity is required to disclose transfers into and out of Level 3 of the fair value hierarchy and purchases and issues of Level 3 assets and liabilities; (2) for investments in certain entities that calculate net asset value, an entity is required to disclose the timing of liquidation of an investee’s assets and the date that restrictions from redemption might lapse, only if the investee has communicated the timing to the entity or announced the timing publicly; and (3) it is clear that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date.  Additionally, this ASU adds disclosure requirements for public entities about (1) the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period, and (2) the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements.  The amendments of ASU 2018-13 became effective for Trustmark on January 1, 2020. Adoption of ASU 2018-13 did not have a material impact on Trustmark’s consolidated financial statements.  Disclosures required by FASB ASC Topic 820 are presented in Note 17 – Fair Value, of this report.

ASU 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.”  Issued in January 2017, ASU 2017-04 simplifies the manner in which an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test.  Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit's goodwill with the carrying amount of that goodwill.  In computing the implied fair value of goodwill under Step 2, an entity, prior to the amendments in ASU 2017-04, had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities, including unrecognized assets and liabilities, in accordance with the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination.  However, under the amendments in ASU 2017-04, an entity should (1) perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and (2) recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value, with the understanding that the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit.  Additionally, ASU 2017-04 removes the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails such qualitative test, to perform Step 2 of the goodwill impairment test.  ASU 2017-04 became effective for Trustmark on January 1, 2020, and the amendments of this ASU will be applicable to the annual goodwill impairment

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test performed as of October 1, 2020.  Based on Trustmark’s annual goodwill impairment test performed as of October 1, 2019, the fair value of its reporting units exceeded the carrying value and, therefore, the related goodwill was not impaired.  

ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.”  Issued in June 2016, ASU 2016-13 will add FASB ASC Topic 326, “Financial Instruments-Credit Losses” and finalizes amendments to FASB ASC Subtopic 825-15, “Financial Instruments-Credit Losses.”  The amendments of ASU 2016-13 are intended to provide financial statement users with more decision-useful information related to expected credit losses on financial instruments and other commitments to extend credit by replacing the current incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates.  The amendments of ASU 2016-13 eliminate the probable initial recognition threshold and, in turn, reflect an entity’s current estimate of all expected credit losses.  ASU 2016-13 does not specify the method for measuring expected credit losses, and an entity is allowed to apply methods that reasonably reflect its expectations of the credit loss estimate.  Additionally, the amendments of ASU 2016-13 require that credit losses on available for sale debt securities be presented as an allowance rather than as a write-down.  The amendments of ASU 2016-13, and all subsequent ASUs issued by FASB to provide additional guidance and clarification related to this Topic, became effective for Trustmark on January 1, 2020.  

As previously disclosed, Trustmark established a cross-functional Current Expected Credit Loss (CECL) Steering Committee, a CECL Solution Development Working Group and a CECL Working Group which included the appropriate members of Management to evaluate the impact this ASU, and all subsequent ASUs issued by FASB, will have on Trustmark’s financial position, results of operations and financial statement disclosures and determine the most appropriate method of implementing the amendments in these ASUs as well as any resources needed to implement the amendments.  Trustmark selected a third-party vendor to provide allowance for loan loss software as well as advisory services in developing a new methodology that would be compliant with amendments of ASU 2016-13.

In accordance with the amendments of ASU 2016-13, Trustmark elected to maintain pools of loans that were previously accounted for under FASB ASC Subtopic 310-30 and will continue to account for these pools as a unit of account.  Loans are only removed from the existing loan pools if they are written off, paid off or sold.  Upon adoption of ASU 2016-13, the allowance for credit losses was determined for each pool and added to the pool’s carrying value to establish a new amortized cost basis.  The difference between the unpaid principle balance of the pool and the new amortized cost basis is the noncredit premium or discount which will be amortized into interest income over the remaining life of the pool.

As a result of adopting the amendments of ASU 2016-13, Trustmark recorded a decrease to its ACL LHFI of $3.0 million and an increase to its ACL on off-balance sheet credit exposures of $29.6 million resulting in a one-time cumulative effect adjustment through retained earnings of $26.6 million ($19.9 million, net of tax) at the date of adoption.  This adjustment included a qualitative adjustment to the allowance for credit losses related to loans and an allowance on off-balance sheet credit exposures.  Trustmark estimates losses over an approximate one-year forecast period using Moody’s baseline economic forecasts, and then reverts to longer term historical loss experience over a one-year period.  

Trustmark’s estimated allowance for credit losses on both held to maturity securities and available for sale securities under the CECL model was deemed immaterial due to the composition of the portfolios being primarily government agency-backed securities for which the risk of loss is minimal.  Therefore, Trustmark did not recognize a cumulative effective adjustment through retained earnings at the date of adoption related to the held to maturity or available for sale securities.

Disclosures required by the amendments ASU 2016-13 are presented in Note 2 – Securities Available for Sale and Held to Maturity and Note 3 – Loans Held for Investment and Allowance for Credit Losses, of this report.

Pending Accounting Pronouncements

ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.”  Issued in March 2020, ASU 2020-04 seeks to provided additional guidance, for a limited time, to ease the potential burden in accounting for or recognizing the effects of reference rate reform on financial reporting.  The FASB issued ASU 2020-04 is response to concerns about the structural risks of interbank offered rates (IBORs) and, in particular, the risk that the London Interbank Offer Rate (LIBOR) will no longer be used.  Regulators have begun reference rate reform initiatives to identify alternative reference rates that are more observable or transaction-based and less susceptible to manipulation.  Stakeholders have raised operational challenges likely to arise with the reference rate reform, particularly related to contract modifications and hedge accounting.  The amendments of ASU 2020-04, which are elective and apply to all entities, provide expedients and exceptions for applying GAAP to contract modifications and hedging relationships affected by the reference rate reform id certain criteria are met.  The amendments apply only to contracts and hedging relationships that reference LIBOR or another reference rate that is expected to be discontinued due to reference rate reform.  The optional expedients for contract modifications should be applied consistently for all contracts or

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transactions within the relevant Codification Topic or Subtopic or Industry Subtopic that contains the related guidance.  The optional expedients for hedging relationships can be elected on an individual hedging relationship basis.  As the guidance in ASU 2020-04 is intended to assist entity’s during the global market-wide reference rate transition period, it is in effect for a limited time, from March 12, 2020 through December 31, 2022.  Management is currently evaluating the impact to Trustmark as a result of the potential discontinuance of LIBOR, and a determination cannot be made at this time as to the impact the amendments of ASU 2020-04 or the reference rate reform will have on its consolidated financial statements.

ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.”  Issued in December 2019, ASU 2019-12 seeks to simplify the accounting for income taxes by removing certain exceptions to the general principles in FASB ASC Topic 740, Income Taxes.  In particular, the amendments of ASU 2019-12 remove the exceptions to (1) the incremental approach for intra-period tax allocation when there is a loss from continuing operations and income or a gain from other items (e.g., discontinued operations or other comprehensive income); (2) the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment; (3) the ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary; and (4) the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year.  The amendments of ASU 2019-12 (1) require that an entity recognize a franchise tax (or similar tax), that is partially based on income, in accordance with FASB ASC Topic 740 and account for any incremental amount incurred as a non-income-based tax; (2) require that an entity evaluate when a step up in the tax basis of goodwill should be considered part of the business combination in which the book goodwill was originally recognized and when it should instead be considered a separate transaction; (3) specify that an entity is not required to allocate the consolidated amount of current and deferred tax expense to a legal entity that is not subject to tax in its separate financial statements, but rather may elect to do so for a legal entity that is both not subject to tax and disregarded by the taxing authority; and (4) require that an entity reflect the effect of an enacted change in tax laws or rates in the annual effective tax rate computation in the interim period that includes the enactment date.  ASU 2019-12 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020.  Early adoption of ASU 2019-12 is permitted, including adoption in any interim period for periods for which financial statements have not yet been issued.  An entity that elects to early adopt the amendments in an interim period should reflect any adjustments as of the beginning of the annual period that includes that interim period.  Additionally, an entity that elects early adoption must adopt all the amendments in the same period.  The amendments related to separate financial statements of legal entities that are not subject to tax should be applied on a retrospective basis for all periods presented.  The amendments related to changes in ownership of foreign equity method investments or foreign subsidiaries should be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption.  The amendments related to franchise taxes that are partially based on income should be applied on either a retrospective basis for all periods presented or a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption.  All other amendments should be applied on a prospective basis.  Trustmark intends to adopt the amendments in ASU 2019-12 during the first quarter of 2021.  Adoption of ASU 2019-12 is not expected to have a material impact to Trustmark’s consolidated financial statements.

ASU 2018-14, “Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans.”  Issued in August 2018, ASU 2018-14 modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans.  The amendments in ASU 2018-14 remove certain disclosure requirements that are no longer considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant.  The amendments of ASU 2018-14 become effective for fiscal years beginning after December 15, 2020.  Trustmark plans to adopt these amendments during the first quarter of 2021.  Management is currently assessing all the potential impacts of the amendments in ASU 2018-14 on Trustmark’s consolidated financial statements; however, the adoption of ASU 2018-14 is not expected to have a material impact on Trustmark’s consolidated financial statements.

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following provides a narrative discussion and analysis of Trustmark Corporation’s (Trustmark) financial condition and results of operations.  This discussion should be read in conjunction with the unaudited consolidated financial statements and the supplemental financial data included in Part I. Item 1. – Financial Statements of this report.

Description of Business

Trustmark, a Mississippi business corporation incorporated in 1968, is a bank holding company headquartered in Jackson, Mississippi.  Trustmark’s principal subsidiary is Trustmark National Bank (TNB), initially chartered by the State of Mississippi in 1889.  At March 31, 2020, TNB had total assets of $14.018 billion, which represented approximately 99.99% of the consolidated assets of Trustmark.

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Through TNB and its other subsidiaries, Trustmark operates as a financial services organization providing banking and other financial solutions through 188 offices and 2,761 full-time equivalent associates (measured at March 31, 2020) located in the states of Alabama, Florida (primarily in the northwest or “Panhandle” region of that state, which is referred to herein as Trustmark’s Florida market), Mississippi, Tennessee (in the Memphis and Northern Mississippi regions, which are collectively referred to herein as Trustmark’s Tennessee market), and Texas (primarily in Houston, which is referred to herein as Trustmark’s Texas market).  Trustmark’s operations are managed along three operating segments: General Banking Segment, Wealth Management Segment and Insurance Segment.  For a complete overview of Trustmark’s business, see the section captioned “The Corporation” included in Part I. Item 1. – Business of Trustmark’s Annual Report on Form 10-K for its fiscal year ended December 31, 2019 (2019 Annual Report).

COVID-19 Update

Trustmark has been proactive in responding to the novel coronavirus (COVID-19) pandemic, and taken comprehensive action to support customers, associates and the communities it serves. Trustmark activated its Pandemic Preparedness Plan to protect the health and safety of its employees and customers, which included temporarily limiting lobby hours at its branches, transitioning approximately 45% of Trustmark’s workforce to work remotely and taking additional precautions to ensure essential employees working within Trustmark’s branches and offices stay safe and healthy.  Trustmark remains committed to serving its customers through drive-through services offered at branches, access to its automated teller machine (ATM) and interactive teller machine (ITM) network and robust digital and mobile banking options which provide additional convenience for Trustmark’s customers.  Trustmark has been proactive in reaching out to customers to discuss challenges and solutions, provided waivers of certain fees and charges, granted extensions, deferrals and forbearance as appropriate, paused all foreclosures and repossessions and refrained from negative credit bureau reporting for previously up-to-date customers. To date, Trustmark has not incurred any significant disruptions to its business activities.

Exposure to Stressed Industries

The full impact of COVID-19 is unknown and rapidly evolving. It has caused substantial disruption in international and the United States economies, markets and employment. The outbreak may have a significant adverse impact on certain industries Trustmark serves.  The following provides a summary of Trustmark’s exposure to COVID-19 impacted industries within the loans held for investment (LHFI) portfolio as of March 31, 2020:

• Restaurants: Aggregate outstanding balance of $116.0 million, credit exposure of $124.0 million, 344 total loans, represents 1.21% of Trustmark’s outstanding LHFI portfolio, 74% of the loans are real estate secured, 55% are full-service restaurants, 24% are limited-service restaurants, 19% are carryout restaurants, and 2% are other.

• Hotels: Aggregate outstanding balance of $366.0 million, credit exposure of $451.0 million, 95 total loans, represents 3.83% of Trustmark’s outstanding LHFI portfolio, 99% of the loans are real estate secured, consists of experienced operators and carry secondary guarantor support, 91% operate under a major hotel chain, pre COVID-19 (as of December 31, 2019) loan to value was 54%, pre COVID-19 debt service coverage was 1.8x.

• Retail (Commercial Real Estate): Aggregate outstanding balance of $505.0 million, credit exposure of $635.0 million, 359 total loans, represents 5.28% of Trustmark’s outstanding LHFI portfolio, 23% are stand-alone buildings with strong essential services tenants, 3% are national grocery store-anchored, 14% are investment grade anchored centers, mall exposure in only one borrower with $5 million outstanding.

• Energy: Aggregate outstanding balance of $131.7 million, credit exposure of $359.6 million, 134 total loans, represents 1.38% of Trustmark’s outstanding LHFI portfolio, no loans where repayment or underlying security ties to realization of value from energy reserves.

• Higher Risk Commercial and Industrial: Aggregate outstanding balance of $3.0 million, credit exposure of $14.0 million, one loan.

During the first quarter of 2020, Trustmark incurred total credit loss expenses of $27.4 million, primarily due to net changes in the economic forecast due to the negative effects of the COVID-19 pandemic on the overall economy and macroeconomic factors. Because of the significant uncertainties related to the ultimate duration of the COVID-19 pandemic and its potential effects on clients and prospects, and on the national and local economy as a whole, there can be no assurances as to how the crisis may ultimately affect Trustmark’s loan portfolio.

Loan Concessions

On March 22, 2020, the federal banking agencies issued an “Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by the Coronavirus”.  This guidance encourages financial institutions to work prudently with borrowers that may be unable to meet their contractual obligations because of the effects of COVID-19.  The guidance goes on to explain that in consultation with the Financial Accounting Standards Board (FASB) staff that the federal banking agencies

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conclude that short-term modifications (e.g. six months) made on a good faith basis to borrowers who were current as of the implementation date of a relief program are not troubled debt restructurings (TDRs).  On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act), a $2 trillion stimulus package intended to provide relief to businesses and consumers in the United States struggling as a result of the pandemic, was signed into law. Section 4013 of the CARES Act also addressed COVID-19 related modifications and specified that COVID-19 related modifications on loans that were current as of December 31, 2019 are not TDRs.  On April 7, 2020, the federal banking agencies revised its earlier guidance to clarify the interaction between the March 22, 2020 interagency statement and section 4013 of the CARES Act, as well as the agencies’ views on consumer protection considerations.  Through April 23, 2020, Trustmark had applied this guidance and modified 1,978 individual loans with aggregate principal balances totaling $976.2 million.  More of these types of modifications are likely to be executed in the second quarter of 2020.  Commercial concessions were primarily either interest only for 90 days or full payment deferrals for 90 days.  Consumer concessions were 90-day full payment deferrals.

Paycheck Protection Program

A provision in the CARES Act included a $349 billion fund for the creation of the Paycheck Protection Program (PPP) through the Small Business Administration (SBA) and Treasury Department. The PPP is intended to provide loans to small businesses to pay their employees, rent, mortgage interest and utilities. PPP loans are forgivable, in whole or in part, if the proceeds are used for payroll and other permitted purposes in accordance with the requirements of the PPP.  These loans carry a fixed rate of 1.00% per annum and a term of two years, if not forgiven, in whole or in part.  Payments are deferred for the first six months of the loan. The loans are 100% guaranteed by the SBA.  The SBA pays the originating bank a processing fee ranging from 1.0% to 5.0%, based on the size of the loan.  The SBA began accepting submissions for these PPP loans on April 3, 2020 and reached the limit of funds originally available to disburse under this program on April 16, 2020.  Legislation providing an additional $320 billion in funding for the PPP was signed into law on April 24, 2020.  The SBA began accepting applications for the new funding on April 27, 2020. Under the CARES Act and interim final rules released by the federal banking agencies, PPP loans receive a zero percent risk weight for regulatory capital purposes, and if pledged as part of the Paycheck Protection Program Liquidity Facility (PPPLF), are subtracted from the lender’s tier 1 leverage ratio.  The PPPLF was established by the Federal Reserve Board (FRB) to provide a liquidity source to PPP lenders, through non-recourse credit secured by PPP loans.

TNB is actively participating in the PPP on behalf of its customers.  TNB began submitting applications to the SBA on Saturday, April 4, 2020 and began funding those loans on Monday, April 13, 2020.  As of April 23, 2020, TNB had secured SBA commitments for approximately 6,000 customer requests totaling over $800.0 million with an average loan size of $137 thousand.  Trustmark cannot predict the amount of PPP loans that will be forgiven in whole or in part by the SBA, nor can it predict the magnitude and timing of the impact the PPP loans and related fees will have on Trustmark’s net interest margin.  However, TNB’s participation in the PPP will likely have a significant impact on Trustmark’s asset mix and net interest margin for the remainder of 2020 as a result of the addition of these low interest rate loans to the LHFI portfolio and the related processing fees earned on these loans.  

Executive Overview

Trustmark has been committed to meeting the banking and financial needs of its customers and communities for over 130 years.  During the COVID-19 pandemic, Trustmark remains focused on providing support, advice and solutions to meet its customers’ unique needs.  During the first three months of 2020, Trustmark experienced strong growth in its fee businesses as noninterest income increased $23.8 million, or 57.3%, when compared to the same time period in 2019.  Trustmark continued to maintain and expand customer relationships as reflected by growth in the LHFI portfolio of $232.3 million, or 2.5%, and growth in deposits of $330.2 million, or 2.9%, during the first three months of 2020.  Trustmark is committed to managing the franchise for the long term, supporting investments to promote profitable revenue growth, realigning delivery channels to support changing customer preferences as well as reengineering and efficiency opportunities to enhance long-term shareholder value.  Trustmark’s capital position remained solid, reflecting the consistent profitability of its diversified financial services businesses.  Trustmark’s Board of Directors declared a quarterly cash dividend of $0.23 per share.  The dividend is payable June 15, 2020, to shareholders of record on June 1, 2020.

Recent Economic and Industry Developments

On March 11, 2020, the World Health Organization declared the outbreak of COVID-19 as a global pandemic, which continues to spread throughout the United States and around the world. The COVID-19 pandemic has adversely affected, and may continue to adversely affect economic activity globally, nationally and locally. Actions taken around the world to help mitigate the spread of COVID-19 include restrictions on travel, quarantines in certain areas, and forced closures for certain types of public places and businesses. COVID-19 and actions taken to mitigate the spread of it have had and are expected to continue to have an adverse impact on the economies and financial markets of many countries, including the geographical area in which Trustmark operates.

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Additionally, the COVID-19 pandemic has significantly affected the financial markets and has resulted in a number of actions by the FRB. Market interest rates have declined significantly. On March 3, 2020, the ten-year Treasury yield fell below 1.00% for the first time, and the FRB reduced the target federal funds rate by 50 basis points to a range of 1.00% to 1.25%. On March 15, 2020, the FRB further reduced the target federal funds rate by 100 basis points to a range of 0.00% to 0.25% and announced a $700 billion quantitative easing program in response to the expected economic downturn caused by the COVID-19 pandemic. The FRB reduced the interest that it pays on excess reserves from 1.60% to 1.10% on March 3, 2020, and then to 0.10% on March 15, 2020. Trustmark expects that these reductions in interest rates, especially if prolonged, could adversely affect its net interest income and margins and its profitability.

It is unknown how long the adverse conditions associated with the COVID-19 pandemic will last or what the complete financial effect will be to Trustmark.  It is reasonably possible that estimates made in the financial statements could be materially and adversely impacted in the near term as a result of these conditions, including expected credit losses on loans and off-balance sheet credit exposures.

Financial Highlights

Trustmark reported net income of $22.2 million, or basic and diluted earnings per share (EPS) of $0.35, in the first quarter of 2020, compared to $33.3 million, or basic and diluted EPS of $0.51, in the first quarter of 2019.  Trustmark’s reported performance during the quarter ended March 31, 2020 produced a return on average tangible equity of 7.34%, a return on average assets of 0.66%, an average equity to average assets ratio of 12.02% and a dividend payout ratio of 65.71%, compared to a return on average tangible equity of 11.55%, a return on average assets of 1.01%, an average equity to average assets ratio of 11.83% and a dividend payout ratio of 45.10% during the quarter ended March 31, 2019.

Total revenue, which is defined as net interest income plus noninterest income, for the three months ended March 31, 2020 was $169.2 million, an increase of $22.9 million, or 15.7%, when compared to the same time period in 2019.  The increase in total revenue for the three months ended March 31, 2020 when compared to the same time period in 2019, was primarily due to the increase in mortgage banking, net.  These factors are discussed in further detail below.

Net interest income for the three months ended March 31, 2020 totaled $104.0 million, a decrease of $856 thousand, or 0.8%, when compared to the same time period in 2019, as declines in interest income were largely offset by a decrease in interest expense caused by a decline in interest on deposits resulting from both lower average balances and interest rates.  Interest income totaled $120.4 million for the three months ended March 31, 2020, a decline of $5.1 million, or 4.1%, when compared to the same time period in 2019, principally due to decreases in interest and fees on acquired loans, as a result of the remaining balance of acquired loans acquired in the BancTrust merger that were transferred to LHFI as part of the adoption of FASB Accounting Standards Codifications (ASC) Topic 326, “Financial Instruments – Credit Losses,” and interest on securities, principally due to a decline in average balances of securities held and lower interest rates during the respective periods.  Interest expense totaled $16.4 million for the three months ended March 31, 2020, a decrease of $4.2 million, or 20.5%, when compared to the same time period in 2019, principally due to the decline in interest on deposits.

Noninterest income for the three months ended March 31, 2020 totaled $65.3 million, an increase of $23.8 million, or 57.3%, when compared to the same time period in 2019.  The increase in noninterest income for the first quarter of 2020 when compared to the same time period in 2019 was primarily due to an increase in mortgage banking, net.  Mortgage banking, net totaled $27.5 million for the three months ended March 31, 2020, an increase of $24.0 million when compared to the same time period in 2019, principally due to the positive net hedge ineffectiveness and an increase in the gain on sales of loans, net.

Noninterest expense for the three months ended March 31, 2020 totaled $123.8 million, an increase of $17.8 million, or 16.8%, when compared to the same time period in 2019, principally due to increases in salaries and employee benefits and services and fees and the addition of the credit loss expense related to off-balance sheet credit exposures as a result of adopting FASB ASC Topic 326.  Salaries and employee benefits totaled $69.1 million for the first quarter of 2020, an increase of $8.2 million, or 13.4%, when compared to the first quarter of 2019.  During the first quarter of 2020, Trustmark completed a voluntary early retirement program and incurred $4.3 million of non-routine salaries and employee benefits expense related to this program.  Excluding these non-routine expenses, salaries and employee benefits increased $3.9 million, or 6.4%, when the first quarter of 2020 is compared to the same time period in 2019, principally due to higher commissions expense resulting from improvements in mortgage production and the insurance line of business as well as an increase in salary expenses as a result of general merit increases.  Services and fees totaled $19.9 million for the three months ended March 31, 2020, an increase of $3.0 million, or 17.5%, when compared to the same time period in 2019, primarily due to increases in legal fees related to ongoing litigation matters and data processing charges related to software.

Trustmark adopted FASB ASC Topic 326, in accordance with the amendments of FASB Accounting Standard Update (ASU) 2016-13, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” effective January 1,

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2020.  The guidance in FASB ASC 326 replaces Trustmark’s previous incurred loss methodology with a methodology that reflects the current expected credit losses (often referred to as CECL) and requires consideration of a broader range of reasonable and supportable information to determine credit losses.  Trustmark’s allowance for credit losses (ACL) for LHFI is an estimate of expected credit losses inherent within Trustmark’s existing LHFI portfolio.  The ACL, LHFI is adjusted through the provision for credit losses and reduced by the charge off of loan amounts, net of recoveries.  FASB ASC Topic 326 also requires Trustmark to estimate expected credit losses for off-balance sheet credit exposures which are not unconditionally cancellable by Trustmark.  Trustmark maintains a separate allowance for credit losses for off-balance sheet credit exposures, including unfunded commitments and letters of credit.  Adjustments to the allowance for credit losses on off-balance sheet credit exposures are recorded as noninterest expense in credit loss expense related to off-balance sheet credit exposures.   Trustmark adopted FASB ASC Topic 326 using the modified retrospective approach prescribed by the amendments of FASB ASU 2016-13; therefore, prior period loan loss provision balances are presented under legacy GAAP and may not be comparable to current period credit loss presentation.  

Trustmark’s provision for credit losses for the three months ended March 31, 2020 totaled $20.6 million compared to a provision for loan losses, LHFI of $1.6 million for the three months ended March 31, 2019.  Credit loss expense related to off-balance sheet credit exposures for the three months ended March 31, 2020 totaled $6.8 million. The increase in the provision for credit losses and the credit loss expense related to off-balance sheet credit exposures for the first quarter of 2020 was primarily due to net changes in the economic forecast due to the current and anticipated negative effects of the COVID-19 pandemic on the overall economy and macroeconomic factors used in the quantitative calculation of the ACL.  Please see the section captioned “Provision for Credit Losses” for additional information regarding the provision for credit losses.

At March 31, 2020, nonperforming assets totaled $77.8 million, a decrease of $4.6 million, or 5.6%, compared to December 31, 2019, reflecting declines in both nonaccrual LHFI and other real estate.  Nonaccrual LHFI totaled $53.0 million at March 31, 2020, a decrease of $234 thousand, or 0.4%, relative to December 31, 2019, primarily due to reductions, pay-offs and charge-offs of nonaccrual LHFI in Trustmark’s Mississippi and Tennessee market regions, which were largely offset by LHFI placed on nonaccrual status in the Mississippi and Alabama market regions during the first quarter of 2020.  Other real estate totaled $24.8 million at March 31, 2020, a decline of $4.4 million, or 15.0%, compared to December 31, 2019, principally due to properties sold and write-downs on foreclosed properties in Trustmark’s Alabama, Mississippi and Florida market regions.

LHFI totaled $9.568 billion at March 31, 2020, an increase of $232.3 million, or 2.5%, compared to December 31, 2019.  On January 1, 2020, Trustmark transferred $72.6 million, the remaining balance of the loans acquired in the BancTrust merger, from acquired impaired loans to LHFI as purchased credit deteriorated (PCD) loans as part of its adoption of FASB ASC Topic 326.  For additional information regarding the acquired loans transferred to LHFI, see the section captioned “Acquired Loans.”  Excluding the transferred acquired loans, LHFI increased $159.7 million, or 1.7%, compared to December 31, 2019.  The increase in LHFI, excluding the transferred acquired loans, during the first three months of 2020 was primarily due to net growth in LHFI secured by real estate in Trustmark’s Texas, Mississippi and Florida market regions as well as increases in other commercial loans in the Mississippi and Tennessee market regions, partially offset by declines in state and other political subdivision loans in Trustmark’s Mississippi market region.  For additional information regarding changes in LHFI and comparative balances by loan category, see the section captioned “LHFI.”

Management has continued its practice of maintaining excess funding capacity to provide Trustmark with adequate liquidity for its ongoing operations.  In this regard, Trustmark benefits from its strong deposit base, its highly liquid investment portfolio and its access to funding from a variety of external funding sources such as upstream federal funds lines, FHLB advances and, on a limited basis, brokered deposits.  See the section captioned “Liquidity” for further discussion of the components of Trustmark’s excess funding capacity.

Total deposits were $11.576 billion at March 31, 2020, an increase of $330.2 million, or 2.9%, compared to December 31, 2019.  During the first three months of 2020, noninterest-bearing deposits increased $85.8 million, or 3.0%, primarily due to growth in all categories of noninterest-bearing deposit accounts.  Interest-bearing deposits increased $244.4 million, or 2.9%, during the first three months of 2020, primarily due to growth in public and commercial interest checking accounts and commercial money market deposit accounts.    

Recent Legislative and Regulatory Developments

On March 27, 2020, President Trump signed the CARES Act, which established a $2 trillion economic stimulus package, including cash payments to individuals, supplemental unemployment insurance benefits and $349 billion to fund the PPP, a loan program administered by the SBA. Under the PPP, small businesses, sole proprietorships, independent contractors and self-employed individuals may apply for loans from existing SBA lenders and other approved regulated lenders that enroll in the program, subject to numerous limitations and eligibility criteria. TNB is participating as a lender in the PPP.

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In addition, the CARES Act and related guidance from the federal banking agencies provide financial institutions the option to temporarily suspend requirements under GAAP related to classification of certain loan modifications as TDRs to account for the current and anticipated effects of COVID-19.

The CARES Act permits financial institutions to defer temporarily the use of FASB ASU 2016-13, also known as CECL, for a limited period of time, but Trustmark has elected not to apply such a deferral.  Relatedly, the federal bank regulatory agencies issued an interim final rule effective March 31, 2020 that allows banking organizations that implement CECL this year to elect to mitigate the effects of the CECL accounting standard on their regulatory capital for two years. This two-year delay is in addition to the three-year transition period that the agencies had already made available (five-year phase-in transition period). Trustmark has elected to defer the regulatory capital effects of CECL in accordance with the interim final rule, which will largely delay the effects of the adoption of CECL on its regulatory capital for the next two years, after which the effects will be phased-in over a three-year period from January 1, 2022 through December 31, 2024.

The CARES Act also includes a range of other provisions designed to support the U.S. economy and mitigate the impact of COVID-19 on financial institutions and their customers, including through the authorization of various programs and measures that the U.S. Department of the Treasury, the FRB and other federal agencies may or are required to implement.  Under section 4022 of the CARES Act, a mortgage servicer must grant up to two 180-day forbearances to any borrower with a federally backed mortgage loan who affirms that he or she is experiencing financial hardship during the COVID-19 emergency.  Additionally, servicers of federally backed mortgage loans are prohibited from initiating judicial or non-judicial foreclosures, other than with respect to vacant or abandoned property, for at least 60 days beginning March 18, 2020.  Under section 4023 of the CARES Act, a servicer of a multifamily mortgage loan must grant up to three 30-day forbearances to a multifamily borrower that was current on payments as of February 1, 2020, requests forbearance, and affirms that the borrower is experiencing a financial hardship during the COVID-19 emergency.  This provision applies from the date of enactment until the earlier of (i) the termination date of the national emergency declared by the President on March 13, 2020, or (ii) December 31, 2020.  Further, in response to the COVID-19 outbreak, the FRB has implemented or announced a number of facilities to provide emergency liquidity to various segments of the U.S. economy and financial markets.

For additional information regarding legislation and regulation applicable to Trustmark, see the section captioned “Supervision and Regulation” included in Part I. Item 1. – Business of Trustmark’s 2019 Annual Report.

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Selected Financial Data

The following tables present financial data derived from Trustmark’s consolidated financial statements as of and for the periods presented ($ in thousands, except per share data):

	Three Months Ended March 31,
	2020			2019
Consolidated Statements of Income
Total interest income	$	120,394		$	125,491
Total interest expense		16,442			20,683
Net interest income		103,952			104,808
Provision for credit losses (1)		20,581			1,611
Provision for loan losses, acquired loans (1)		—			78
Noninterest income		65,264			41,491
Noninterest expense		123,810			106,021
Income before income taxes		24,825			38,589
Income taxes		2,607			5,250
Net Income	$	22,218		$	33,339
Total Revenue (2)	$	169,216		$	146,299
Per Share Data
Basic earnings per share	$	0.35		$	0.51
Diluted earnings per share		0.35			0.51
Cash dividends per share		0.23			0.23
Performance Ratios
Return on average equity		5.45	%		8.50	%
Return on average tangible equity		7.34	%		11.55	%
Return on average assets		0.66	%		1.01	%
Average equity/average assets		12.02	%		11.83	%
Net interest margin (fully taxable equivalent)		3.52	%		3.63	%
Dividend payout ratio		65.71	%		45.10	%
Credit Quality Ratios (3)
Net charge-offs (recoveries)/average loans		0.13	%		0.09	%
Provision for credit losses/average loans (1)		0.86	%		0.07	%
Nonperforming loans/total loans (incl LHFS)		0.54	%		0.62	%
Nonperforming assets/total loans (incl LHFS)    plus other real estate		0.78	%		0.96	%
Allowance for credit losses/total loans (excl LHFS) (1)		1.05	%		0.88	%

(1) Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

(2) Consistent with Trustmark’s audited annual financial statements, total revenue is defined as net interest income plus noninterest income.

(3) Ratios for the period ended March 31, 2019 exclude acquired loans.

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March 31,	2020			2019
Consolidated Balance Sheets
Total assets	$	14,019,829		$	13,478,017
Securities		2,538,055			2,607,764
Total loans (incl LHFS and acquired loans)		9,893,309			9,260,898
Deposits		11,575,764			11,534,815
Total shareholders' equity		1,652,399			1,587,028
Stock Performance
Market value - close	$	23.30		$	33.63
Book value		26.06			24.49
Tangible book value		19.92			18.48
Capital Ratios
Total equity/total assets		11.79	%		11.77	%
Tangible equity/tangible assets		9.27	%		9.15	%
Tangible equity/risk-weighted assets		11.05	%		11.35	%
Tier 1 leverage ratio (1)		10.21	%		10.05	%
Common equity tier 1 risk-based capital ratio (1)		11.35	%		11.88	%
Tier 1 risk-based capital ratio (1)		11.88	%		12.45	%
Total risk-based capital ratio (1)		12.78	%		13.21	%

(1) Trustmark elected the five-year phase-in transition period related to adopting FASB ASU 2016-13 for regulatory capital purposes.

Non-GAAP Financial Measures

In addition to capital ratios defined by U.S. generally accepted accounting principles (GAAP) and banking regulators, Trustmark utilizes various tangible common equity measures when evaluating capital utilization and adequacy.  Tangible common equity, as defined by Trustmark, represents common equity less goodwill and identifiable intangible assets.

Trustmark believes these measures are important because they reflect the level of capital available to withstand unexpected market conditions.  Additionally, presentation of these measures allows readers to compare certain aspects of Trustmark’s capitalization to other organizations.  These ratios differ from capital measures defined by banking regulators principally in that the numerator excludes shareholders’ equity associated with preferred securities, the nature and extent of which varies across organizations.  In Management’s experience, many stock analysts use tangible common equity measures in conjunction with more traditional bank capital ratios to compare capital adequacy of banking organizations with significant amounts of goodwill or other intangible assets, typically stemming from the use of the purchase accounting method in accounting for mergers and acquisitions.

These calculations are intended to complement the capital ratios defined by GAAP and banking regulators.  Because GAAP does not include these capital ratio measures, Trustmark believes there are no comparable GAAP financial measures to these tangible common equity ratios.  Despite the importance of these measures to Trustmark, there are no standardized definitions for them and, as a result, Trustmark’s calculations may not be comparable with other organizations.  Also, there may be limits in the usefulness of these measures to investors.  As a result, Trustmark encourages readers to consider its consolidated financial statements and the notes related thereto in their entirety and not to rely on any single financial measure. 

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The following table reconciles Trustmark’s calculation of these measures to amounts reported under GAAP for the periods presented ($ in thousands, except per share data):

		Three Months Ended March 31,
		2020			2019
TANGIBLE EQUITY
AVERAGE BALANCES
Total shareholders' equity		$	1,640,070		$	1,590,187
Less:  Goodwill			(380,671	)		(379,627	)
Identifiable intangible assets			(8,049	)		(10,666	)
Total average tangible equity		$	1,251,350		$	1,199,894
PERIOD END BALANCES
Total shareholders' equity		$	1,652,399		$	1,587,028
Less:  Goodwill			(381,717	)		(379,627	)
Identifiable intangible assets			(7,537	)		(10,092	)
Total tangible equity	(a)	$	1,263,145		$	1,197,309
TANGIBLE ASSETS
Total assets		$	14,019,829		$	13,478,017
Less:  Goodwill			(381,717	)		(379,627	)
Identifiable intangible assets			(7,537	)		(10,092	)
Total tangible assets	(b)	$	13,630,575		$	13,088,298
Risk-weighted assets	(c)	$	11,427,297		$	10,548,472
NET INCOME ADJUSTED FOR INTANGIBLE AMORTIZATION
Net income		$	22,218		$	33,339
Plus:  Intangible amortization net of tax			609			826
Net income adjusted for intangible amortization		$	22,827		$	34,165
Period end shares outstanding	(d)		63,396,912			64,789,943
TANGIBLE EQUITY MEASUREMENTS
Return on average tangible equity (1)			7.34	%		11.55	%
Tangible equity/tangible assets	(a)/(b)		9.27	%		9.15	%
Tangible equity/risk-weighted assets	(a)/(c)		11.05	%		11.35	%
Tangible book value	(a)/(d)*1,000	$	19.92		$	18.48
COMMON EQUITY TIER 1 CAPITAL (CET1)
Total shareholders' equity		$	1,652,399		$	1,587,028
CECL transitional adjustment (2)			26,476			—
AOCI-related adjustments			(7,698	)		40,915
CET1 adjustments and deductions:
Goodwill net of associated deferred tax liabilities (DTLs)			(367,825	)		(365,748	)
Other adjustments and deductions for CET1 (3)			(6,269	)		(9,099	)
CET1 capital	(e)		1,297,083			1,253,096
Additional tier 1 capital instruments plus related surplus			60,000			60,000
Tier 1 Capital		$	1,357,083		$	1,313,096
Common equity tier 1 risk-based capital ratio	(e)/(c)		11.35	%		11.88	%

(1) Calculated using annualized net income adjusted for intangible amortization divided by total average tangible equity.

(2) Trustmark elected the five-year phase-in transition period related to adopting FASB ASU 2016-13 for regulatory capital purposes.

(3) Includes other intangible assets, net of DTLs, disallowed deferred tax assets, threshold deductions and transition adjustments, as applicable.

Trustmark discloses certain non-GAAP financial measures, including net income adjusted for significant non-routine transactions, because Management uses these measures for business planning purposes, including to manage Trustmark’s business against internal projected results of operations and to measure Trustmark’s performance.  Trustmark views these as measures of its core operating business, which exclude the impact of the items detailed below, as these items are generally not operational in nature.  These non-GAAP financial measures also provide another basis for comparing period-to-period results as presented in the accompanying selected financial data table and the consolidated financial statements by excluding potential differences caused by non-operational and unusual or non-recurring items.  Readers are cautioned that these adjustments are not permitted under GAAP.  Trustmark encourages readers to consider its consolidated financial statements and the notes related thereto in their entirety, and not to rely on any single financial measure.

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The following table presents adjustments to net income and selected financial ratios as reported in accordance with GAAP resulting from significant non-routine items occurring during the periods presented ($ in thousands, except per share data):

	Three Months Ended March 31,
	2020						2019
	Amount			Diluted EPS			Amount			Diluted EPS
Net Income (GAAP)	$	22,218		$	0.35		$	33,339		$	0.51
Significant non-routine transactions (net of taxes):
Voluntary early retirement program		3,281			0.05			—			—
Net Income adjusted for significant    non-routine transactions (Non-GAAP)	$	25,499		$	0.40		$	33,339		$	0.51
	Reported (GAAP)			Adjusted (Non-GAAP)			Reported (GAAP)			Adjusted (Non-GAAP)
Return on average equity		5.45	%		6.25	%		8.50	%	n/a
Return on average tangible equity		7.34	%		8.39	%		11.55	%	n/a
Return on average assets		0.66	%		0.75	%		1.01	%	n/a

n/a – not applicable

Results of Operations

Net Interest Income

Net interest income is the principal component of Trustmark’s income stream and represents the difference, or spread, between interest and fee income generated from earning assets and the interest expense paid on deposits and borrowed funds.  Fluctuations in interest rates, as well as volume and mix changes in earning assets and interest-bearing liabilities, can materially impact net interest income. The net interest margin is computed by dividing fully taxable equivalent (FTE) net interest income by average interest-earning assets and measures how effectively Trustmark utilizes its interest-earning assets in relationship to the interest cost of funding them.  The accompanying yield/rate analysis table shows the average balances for all assets and liabilities of Trustmark and the interest income or expense associated with earning assets and interest-bearing liabilities.  The yields and rates have been computed based upon interest income and expense adjusted to a FTE basis using the federal statutory corporate tax rate in effect for each of the periods shown.  Loans on nonaccrual have been included in the average loan balances, and interest collected prior to these loans having been placed on nonaccrual has been included in interest income.  Loan fees included in interest associated with the average loan balances were immaterial.

Net interest income-FTE for the three months ended March 31, 2020 decreased $979 thousand, or 0.9%, when compared with the same time period in 2019.  The net interest margin for the three months ended March 31, 2020 decreased 11 basis points to 3.52% when compared to the same time period in 2019.  The decrease in the net interest margin for the three months ended March 31, 2020 was principally due to declines in the yield on the LHFI and LHFS portfolios and the acquired loans that were transferred to LHFI as a result of the adoption of FASB ASC Topic 326, partially offset by lower costs of interest-bearing deposits.

TNB has been actively participating in the PPP created by the CARES Act on behalf of its customers since April 4, 2020.  As of April 23, 2020, TNB had secured SBA commitments for approximately 6,000 customer requests totaling over $800.0 million.  PPP loans are included in Trustmark’s LHFI portfolio subsequent to April 4, 2020. Processing fees earned by TNB as the originating lender will be amortized over twenty-four months, the maximum life of the loans.  Payments on PPP loans are deferred for six months, at which time they may be forgiven in whole or in part by the SBA.  Trustmark cannot predict the amount of PPP loans that will be forgiven in whole or in part by the SBA, nor can it predict the magnitude and timing of the impact the PPP loans and related fees will have on Trustmark’s net interest margin.  However, TNB’s participation in the PPP will likely have a significant impact on Trustmark’s asset mix and net interest margin for the remainder of 2020 as a result of the addition of these low interest rate loans to the LHFI portfolio and the related processing fees earned on these loans.  

Average interest-earning assets for the first three months of 2020 were $12.229 billion compared to $12.075 billion for the same time period in 2019, an increase of $153.5 million, or 1.3%.  The increase in average earning assets during the first three months of 2020 was primarily due to an increase in average loans (LHFS and LHFI) of $640.0 million, or 7.1%, which was partially offset by decreases in average total securities of $325.9 million, or 12.1%, and average acquired loans of $104.3 million.  The increase in average loans (LHFS and LHFI) was primarily attributable to the $572.9 million, or 6.4%, increase in the LHFI portfolio when balances at March 31, 2020 are compared to balances at March 31, 2019.  This increase was principally due to net growth in loans secured by real estate and other commercial loans, partially offset by net declines in commercial and industrial loans and state and

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other political subdivision loans.  The decrease in average total securities when the first three months of 2020 is compared to the same time period in 2019 was primarily due to calls, maturities and pay-downs of the underlying loans of government-sponsored enterprise (GSE) guaranteed securities.  The decrease in average acquired loans when the first three months of 2020 is compared to the same time period in 2019 was primarily due to acquired loans that were transferred to LHFI as PCD loans on January 1, 2020 as part of Trustmark’s adoption of FASB ASC Topic 326.  

During the first three months of 2020, interest income-FTE totaled $123.5 million, a decrease of $5.2 million, or 4.1%, while the yield on total earning assets declined 26 basis points to 4.06% when compared to the first three months of 2019.  The decline in interest income-FTE for the first three months of 2020 was primarily due to declines in interest and fees on acquired loans and interest on securities-taxable.  Interest and fees on acquired loans declined $1.9 million when the first three months of 2020 is compared to the same time period in 2019, primarily due to acquired loans that were transferred to LHFI as PCD loans on January 1, 2020 as part of Trustmark’s adoption of FASB ASC Topic 326.  As a result of this transfer, Trustmark no longer receives the net interest margin benefit that the acquired loan portfolio previously provided.  During the first three months of 2020, interest on securities-taxable decreased $1.7 million, or 11.7%, while the yield on securities-taxable declined 2 basis points to 2.25% when compared to the same time period in 2019, primarily due to the run off of maturing investment securities during 2019. During the first three months of 2020, interest and fees on LHFS and LHFI-FTE declined $533 thousand, or 0.5%, when compared to the same time period in 2019, while the yield on loans (LHFS and LHFI) decreased 39 basis points to 4.54% as a result of decreases in interest rates.

Average interest-bearing liabilities for the first three months of 2020 totaled $8.843 billion compared to $8.805 billion for the same time period in 2019, an increase of $38.2 million, or 0.4%.  The increase in average interest-bearing liabilities was primarily the result of an increase in average federal funds purchased and securities sold under repurchase agreements which was largely offset by a decline in average interest-bearing deposits.  Average federal funds purchased and securities sold under repurchase agreements for the first three months of 2020 increased $163.2 million when compared to the same time period in 2019, primarily due to an increase in upstream federal funds purchased as a result of changes in funding needs as growth in earning assets exceeded deposit growth.  Average interest-bearing deposits for the first three months of 2020 decreased $119.5 million, or 1.4%, when compared to the same time period in 2019, as growth in average interest-bearing demand deposits was more than offset by declines in average savings and time deposits primarily due to decreases in interest rates in general.

Interest expense for the first three months of 2020 totaled $16.4 million, a decrease of $4.2 million, or 20.5%, when compared with the same time period in 2019, while the rate on total interest-bearing liabilities decreased 20 basis points to 0.75%.  The decrease in total interest expense for the first three months of 2020 when compared to the same time period in 2019 was primarily due to a decline in interest on deposits.  Interest on deposits decreased $4.6 million, or 23.6%, while the rate on interest-bearing deposits decreased 22 basis points to 0.71% when the first three months of 2020 is compared to the same time period in 2019, primarily due to declines in both average balances of interest-bearing deposits and interest rates.

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The following table provides the tax equivalent basis yield or rate for each component of the tax equivalent net interest margin for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020								2019
	Average Balance			Interest		Yield/ Rate			Average Balance			Interest		Yield/ Rate
Assets
Interest-earning assets:
Federal funds sold and securities purchased under    reverse repurchase agreements	$	164		$	—		—		$	277		$	2		2.93	%
Securities - taxable		2,315,162			12,948		2.25	%		2,619,933			14,665		2.27	%
Securities - nontaxable		47,729			457		3.85	%		68,869			646		3.80	%
Loans (LHFS and LHFI)		9,678,174			109,357		4.54	%		9,038,204			109,890		4.93	%
Acquired loans (1)		—			—		—			104,316			1,916		7.45	%
Other earning assets		187,327			740		1.59	%		243,493			1,603		2.67	%
Total interest-earning assets		12,228,556			123,502		4.06	%		12,075,092			128,722		4.32	%
Other assets		1,498,725								1,447,611
Allowance for credit losses, LHFI (2)		(85,015	)							(82,227	)
Total Assets	$	13,642,266							$	13,440,476
Liabilities and Shareholders' Equity
Interest-bearing liabilities:
Interest-bearing deposits	$	8,448,377			14,957		0.71	%	$	8,567,858			19,570		0.93	%
Federal funds purchased and securities sold under    repurchase agreements		247,513			625		1.02	%		84,352			288		1.38	%
Other borrowings		147,135			860		2.35	%		152,660			825		2.19	%
Total interest-bearing liabilities		8,843,025			16,442		0.75	%		8,804,870			20,683		0.95	%
Noninterest-bearing demand deposits		2,910,951								2,824,220
Other liabilities		248,220								221,199
Shareholders' equity		1,640,070								1,590,187
Total Liabilities and Shareholders' Equity	$	13,642,266							$	13,440,476
Net Interest Margin					107,060		3.52	%					108,039		3.63	%
Less tax equivalent adjustment					3,108								3,231
Net Interest Margin per Consolidated    Statements of Income				$	103,952							$	104,808

(1) Upon adoption of FASB ASC Topic 326 on January 1, 2020, Trustmark elected to account for its existing acquired loans as PCD loans included within the LHFI portfolio.

(2) Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

Provision for Credit Losses

Trustmark adopted FASB ASC Topic 326, in accordance with the amendments of FASB ASU 2016-13, effective January 1, 2020.  The guidance in FASB ASC 326 replaces Trustmark’s previous incurred loss methodology with a methodology that reflects the current expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit losses.  The provision for credit losses is the amount necessary to maintain the allowance for credit losses, LHFI at the amount of expected credit losses inherent within the LHFI portfolio.  The amount of provision for credit losses and the related ACL for LHFI are based on Trustmark’s ACL methodology.  The provision for credit losses totaled $20.6 million for the three months ended March 31, 2020, compared to a provision for loan losses, LHFI of $1.6 million for the same time period in 2019.  The increase in the provision for credit losses for the three months ended March 31, 2020 was primarily due to net changes in the economic forecast due to the current and anticipated negative effects of the COVID-19 pandemic on the overall economy and macroeconomic factors used in the quantitative calculation of the ACL.  See the section captioned “Allowance for Credit Losses, LHFI” for information regarding Trustmark’s ACL methodology as well as further analysis of the provision for credit losses.

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Noninterest Income

Noninterest income represented 38.6% of total revenue, before securities gains (losses), net, for the three months ended March 31, 2020, compared to 28.4% for the three months ended March 31, 2019.  The following table provides the comparative components of noninterest income for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020		2019		$ Change			% Change
Service charges on deposit accounts	$	10,032	$	10,265	$	(233	)		-2.3	%
Bank card and other fees		5,355		7,191		(1,836	)		-25.5	%
Mortgage banking, net		27,483		3,442		24,041		n/m
Insurance commissions		11,550		10,871		679			6.2	%
Wealth management		8,537		7,483		1,054			14.1	%
Other, net		2,307		2,239		68			3.0	%
Total noninterest income	$	65,264	$	41,491	$	23,773			57.3	%

n/m - percentage changes greater than +/- 100% are not considered meaningful

Changes in various components of noninterest income are discussed in further detail below.  For analysis of Trustmark’s insurance commissions and wealth management income, please see the section captioned “Results of Segment Operations.”

Bank Card and Other Fees

The decrease in bank card and other fees for the three months ended March 31, 2020 compared to the same time period in 2019 was principally due to declines in income from customer derivatives primarily related to the credit valuation adjustment as a result of the declining interest rate environment.

Mortgage Banking, Net

The following table illustrates the components of mortgage banking, net included in noninterest income for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019			$ Change			% Change
Mortgage servicing income, net	$	5,819		$	5,607		$	212			3.8	%
Change in fair value-MSR from runoff		(2,607	)		(2,398	)		(209	)		-8.7	%
Gain on sales of loans, net		14,339			4,981			9,358		n/m
Mortgage banking income before net    hedge ineffectiveness		17,551			8,190			9,361		n/m
Change in fair value-MSR from market    changes		(23,999	)		(8,863	)		(15,136	)	n/m
Change in fair value of derivatives		33,931			4,115			29,816		n/m
Net hedge ineffectiveness		9,932			(4,748	)		14,680		n/m
Mortgage banking, net	$	27,483		$	3,442		$	24,041		n/m

n/m - percentage changes greater than +/- 100% are not considered meaningful

The increase in mortgage banking, net for the three months ended March 31, 2020 when compared to the same time period in 2019 was principally due to the positive net hedge ineffectiveness and an increase in the gain on sales of loans, net.  The positive hedge ineffectiveness for the three months ended March 31, 2020 was primarily due to widening spreads between mortgage and ten-year Treasury rates.  Mortgage loan production for the three months ended March 31, 2020 was $457.2 million, an increase of $173.7 million, or 61.3%, when compared to the same time period in 2019.  Loans serviced for others totaled $7.157 billion at March 31, 2020, compared with $6.860 billion at March 31, 2019, an increase of $297.1 million, or 4.3%.

Representing a significant component of mortgage banking income is the gain on sales of loans, net.  The increase in the gain on sales of loans, net when the three months ended March 31, 2020 is compared to the same time period in 2019, was primarily the result of increases in the mortgage valuation adjustment and the volume of loans sold as well as higher profit margins in secondary marketing activities.  Loan sales totaled $317.1 million for the three months ended March 31, 2020, an increase of $108.1 million, or 51.8%, when compared with the same time period in 2019.

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Other Income, Net

The following table illustrates the components of other income, net included in noninterest income for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019			$ Change			% Change
Partnership amortization for tax credit    purposes	$	(1,161	)	$	(2,010	)	$	849			42.2	%
Increase in life insurance cash    surrender value		1,722			1,783			(61	)		-3.4	%
Other miscellaneous income		1,746			2,466			(720	)		-29.2	%
Total other, net	$	2,307		$	2,239		$	68			3.0	%

Noninterest Expense

The following table illustrates the comparative components of noninterest expense for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020		2019			$ Change			% Change
Salaries and employee benefits	$	69,148	$	60,954		$	8,194			13.4	%
Services and fees		19,930		16,968			2,962			17.5	%
Net occupancy-premises		6,286		6,454			(168	)		-2.6	%
Equipment expense		5,616		5,924			(308	)		-5.2	%
Other real estate expense:
Write-downs		997		1,656			(659	)		-39.8	%
Net (gain) loss on sale		70		(122	)		192		n/m
Carrying costs		227		218			9			4.1	%
Total other real estate expense, net		1,294		1,752			(458	)		-26.1	%
Credit loss expense related to off-balance    sheet credit exposures (1)		6,783		—			6,783		n/m
Other expense		14,753		13,969			784			5.6	%
Total noninterest expense	$	123,810	$	106,021		$	17,789			16.8	%

n/m - percentage changes greater than +/- 100% are not considered meaningful

(1) Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

Changes in the various components of noninterest expense are discussed in further detail below.  Management considers disciplined expense management a key area of focus in the support of improving shareholder value.

Salaries and Employee Benefits

During the first quarter of 2020, Trustmark completed a voluntary early retirement program and incurred $4.3 million of non-routine salaries and employee benefits expense related to this program.  Excluding these non-routine expenses, salaries and employee benefits increased $3.9 million, or 6.4%, when the first quarter of 2020 is compared to the same time period in 2019, principally due to higher commissions expense resulting from improvements in mortgage production and the insurance line of business as well as an increase in salary expenses as a result of general merit increases.

Services and Fees

The increase in services and fees when the three months ended March 31, 2020 is compared to the same time period in 2019, was primarily increases in legal fees related to ongoing litigation matters and data processing charges related to software.

Credit Loss Expense Related to Off-Balance Sheet Credit Exposures

Trustmark adopted FASB ASC Topic 326, in accordance with the amendments of FASB ASU 2016-13, effective January 1, 2020.  The guidance in FASB ASC 326 replaces Trustmark’s previous incurred loss methodology with a methodology that reflects the current expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine

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credit losses.  FASB ASC Topic 326 also requires Trustmark to estimate expected credit losses for off-balance sheet credit exposures which are not unconditionally cancellable by Trustmark.  Trustmark maintains a separate ACL for off-balance sheet credit exposures, including unfunded commitments and letters of credit.  Adjustments to the ACL on off-balance sheet credit exposures are recorded as noninterest expense in credit loss expense related to off-balance sheet credit exposures.  The increase in the credit loss expense related to off-balance sheet exposures for the first quarter of 2020 was primarily due to net changes in the economic forecast due to the current and anticipated negative effects of the COVID-19 pandemic on the overall economy and macroeconomic factors used in the quantitative calculation of the ACL.

Other Expense

The following table illustrates the comparative components of other noninterest expense for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020		2019		$ Change			% Change
Loan expense	$	2,799	$	2,697	$	102			3.8	%
Amortization of intangibles		812		1,101		(289	)		-26.2	%
FDIC assessment expense		1,590		1,758		(168	)		-9.6	%
Other miscellaneous expense		9,552		8,413		1,139			13.5	%
Total other expense	$	14,753	$	13,969	$	784			5.6	%

The increase in other expense when the three months ended March 31, 2020 is compared to the same time period in 2019, was primarily due to an increase in other miscellaneous expense principally resulting from accrued expense related to the Trust Department.

Results of Segment Operations

For a description of the methodologies used to measure financial performance and financial information by reportable segment, please see Note 19 – Segment Information included in Part I. Item 1. – Financial Statements of this report.  During the first quarter of 2020, Trustmark revised the composition of its operating segments by moving the Retail Private Banking Group from the General Banking Segment to the Wealth Management Segment as a result of a change in supervision of this group for segment reporting purposes.  Prior period amounts include reclassifications to conform to the current period presentation.  The following discusses changes in the results of operations of each reportable segment for the three months ended March 31, 2020 and 2019.

General Banking

Net interest income for the General Banking Segment decreased $602 thousand, or 0.6%, when the three months ended March 31, 2020 is compared with the same time period in 2019.  The decrease in net interest income was principally due to decreases in interest and fees on acquired loans and interest on securities, which were largely offset by a decrease in interest on deposits, primarily due to declines in both average balances of interest-bearing deposits and interest rates.  The provision for credit losses for the three months ended March 31, 2020 totaled $18.4 million compared to a provision for loan losses, net of $1.7 million for the same period in 2019, an increase of $16.7 million primarily due to the impact of the COVID pandemic on the macroeconomic factors used in Trustmark’s ACL methodology.  For more information on these net interest income items, please see the sections captioned “Financial Highlights” and “Results of Operations.”

Noninterest income for the General Banking Segment increased $22.3 million, or 97.2%, when the first three months of 2020 is compared to the same time period in 2019, primarily due to the increase in mortgage banking, net, principally due to increases in the net hedge ineffectiveness and gain on sales of loans, net.  Noninterest income for the General Banking Segment represented 30.6% of total revenue for this segment for the first three months of 2020 as opposed to 18.2% for the same time period in 2019.  Noninterest income for the General Banking Segment includes service charges on deposit accounts; bank card and other fees; mortgage banking, net; other income, net and securities gains (losses), net.  For more information on these noninterest income items, please see the analysis included in the section captioned “Noninterest Income.”

Noninterest expense for the General Banking Segment increased $16.4 million, or 18.3%, when the first three months of 2020 is compared with the same time period in 2019, principally due to increases in salaries and employee benefits, services and fees and the addition of the credit loss expense related to off-balance sheet credit exposures as a result of the adoption of FASB ASC Topic 326.  During the first quarter of 2020, Trustmark completed a voluntary early retirement program which resulted in non-routine transaction expenses of $4.4 million ($4.3 million of salaries and employee benefits expense and $102 thousand of other expense).  For more information on these noninterest expense items, please see the analysis included in the section captioned “Noninterest Expense.”

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Wealth Management

Net income for the Wealth Management Segment for the first three months of 2020 decreased $1.9 million when compared to the same time period in 2019, primarily due to $2.2 million increase in the provision for credit losses related to loans generated by the Private Banking Department as a result of the change in allowance methodology and the impact of the COVID-19 pandemic on the macroeconomic factors used in the ACL methodology.  Net interest income for the Wealth Management Segment totaled $1.5 million for the first three months of 2020, a decrease of $244 thousand, or 14.0%, when compared to the same time period in 2019, primarily due to a decrease in interest and fees on loans, primarily caused by a decrease in interest rates generally.  Noninterest income, which primarily includes income related to investment management, trust and brokerage services, increased $813 thousand, or 10.6%, when the first three months of 2020 is compared to the same time period in 2019, primarily due to increases in investment services and trust management income.  Noninterest expense for the Wealth Management Segment increased $853 thousand, or 11.1%, when the first three months of 2020 is compared to the same time period in 2019, principally due to an increase in other miscellaneous expense related to accrued expense for the Trust Department.

At March 31, 2020 and 2019, Trustmark held assets under management and administration of $11.641 billion and $11.381 billion, respectively, and brokerage assets of $1.764 billion and $1.867 billion, respectively.

Insurance

Net income for the Insurance Segment for the first three months of 2020 increased $145 thousand, or 7.5%, when compared to the same time period in 2019.  Noninterest income for the Insurance Segment, which is predominately composed of insurance commissions, increased $697 thousand, or 6.4%, when the first three months of 2020 is compared to the same time period in 2019, primarily due to new business commission volume in the property and casualty business.  Noninterest expense for the Insurance Segment increased $501 thousand, or 6.0%, when the first three months of 2020 is compared to the same time period in 2019, primarily due to higher salaries expense resulting from modest general merit increases and higher commission expense due to improvements in business volumes.

Income Taxes

For the three months ended March 31, 2020, Trustmark’s combined effective tax rate was 10.5% compared to 13.6% for the same time period in 2019, respectively.  Trustmark’s effective tax rate continues to be less than the statutory rate primarily due to various tax-exempt income items and its utilization of income tax credit programs.  Trustmark invests in partnerships that provide income tax credits on a Federal and/or State basis (i.e., new market tax credits, low income housing tax credits or historical tax credits).  The income tax credits related to these partnerships are utilized as specifically allowed by income tax law and are recorded as a reduction in income tax expense.

Financial Condition

Earning assets serve as the primary revenue streams for Trustmark and are comprised of securities, loans, federal funds sold and other earning assets.  Average earning assets totaled $12.229 billion, or 89.6% of total average assets, for the three months ended March 31, 2020, compared to $12.075 billion, or 89.8% of total average assets, for the three months ended March 31, 2019, an increase of $153.5 million, or 1.3%.

Securities

The securities portfolio is utilized by Management to manage interest rate risk, generate interest income, provide liquidity and use as collateral for public deposits and wholesale funding.  Risk and return can be adjusted by altering duration, composition and/or balance of the portfolio.  The weighted-average life of the portfolio was 3.2 years at March 31, 2020 compared to 3.5 years at December 31, 2019.

When compared with December 31, 2019, total investment securities increased by $197.6 million, or 8.4%, during the first three months of 2020.  This increase resulted primarily from purchases of and improvement in the fair market value of available for sale securities, partially offset by calls, maturities and pay-downs of the loans underlying GSE guaranteed securities.  Trustmark sold no securities during the first three months of 2020 or 2019.

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During 2013, Trustmark reclassified approximately $1.099 billion of securities available for sale to securities held to maturity to mitigate the potential adverse impact of a rising interest rate environment on the fair value of the available for sale securities and the related impact on tangible common equity.  The resulting net unrealized holding loss is being 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.  At March 31, 2020, the net unamortized, unrealized loss on the transferred securities included in accumulated other comprehensive income (loss), net of tax, (AOCI) in the accompanying consolidated balance sheets totaled $11.2 million ($8.4 million net of tax) compared to $12.1 million ($9.1 million net of tax) at December 31, 2019.

Available for sale securities are carried at their estimated fair value with unrealized gains or losses recognized, net of taxes, in AOCI, a separate component of shareholders’ equity.  At March 31, 2020, available for sale securities totaled $1.834 billion, which represented 72.3% of the securities portfolio, compared to $1.602 billion, or 68.5%, at December 31, 2019.  At March 31, 2020, unrealized gains, net on available for sale securities totaled $41.9 million compared to unrealized gains, net of $1.4 million at December 31, 2019.  At March 31, 2020, available for sale securities consisted of obligations of states and political subdivisions, GSE guaranteed mortgage-related securities and direct obligations of government agencies and GSEs.

Held to maturity securities are carried at amortized cost and represent those securities that Trustmark both intends and has the ability to hold to maturity.  At March 31, 2020, held to maturity securities totaled $704.3 million, which represented 27.7% of the total securities portfolio, compared with $738.1 million, or 31.5%, at December 31, 2019.

Management continues to focus on asset quality as one of the strategic goals of the securities portfolio, which is evidenced by the investment of 97.7% of the portfolio in GSE-backed obligations and other Aaa-rated securities as determined by Moody’s Investors Services (Moody’s).  None of the securities owned by Trustmark are collateralized by assets which are considered sub-prime.  Furthermore, outside of stock ownership in the FHLB of Dallas, FHLB of Atlanta and Federal Reserve Bank of Atlanta, Trustmark does not hold any other equity investment in a GSE.

As of March 31, 2020, Trustmark did not hold securities of any one issuer with a carrying value exceeding 10% of total shareholders’ equity, other than certain GSEs which are exempt from inclusion.  Management continues to closely monitor the credit quality as well as the ratings of the debt and mortgage-backed securities issued by the GSEs and held in Trustmark’s securities portfolio.

The following table presents Trustmark’s securities portfolio by amortized cost and estimated fair value and by credit rating, as determined by Moody’s, at March 31, 2020 ($ in thousands):

	March 31, 2020
	Amortized Cost					Estimated Fair Value
	Amount		%			Amount		%
Securities Available for Sale
Aaa	$	1,768,767		98.7	%	$	1,810,207		98.7	%
Aa1 to Aa3		5,450		0.3	%		5,483		0.3	%
Baa1 to Baa3		1,078		0.1	%		1,098		0.1	%
Not Rated (1)		16,557		0.9	%		16,991		0.9	%
Total securities available for sale	$	1,791,852		100.0	%	$	1,833,779		100.0	%
Securities Held to Maturity
Aaa	$	672,519		95.5	%	$	699,341		95.6	%
Aa1 to Aa3		26,208		3.7	%		26,418		3.6	%
Not Rated (1)		5,549		0.8	%		5,682		0.8	%
Total securities held to maturity	$	704,276		100.0	%	$	731,441		100.0	%

(1) Not rated securities primarily consist of Mississippi municipal general obligations.

The table above presenting the credit rating of Trustmark’s securities is formatted to show the securities according to the credit rating category, and not by category of the underlying security.  At March 31, 2020, approximately 98.7% of the available for sale securities, measured at the estimated fair value, and 95.5% of the held to maturity securities, measured at amortized cost, were rated Aaa.

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LHFS

At March 31, 2020, LHFS totaled $325.4 million, consisting of $268.9 million of residential real estate mortgage loans in the process of being sold to third parties and $56.5 million of GNMA optional repurchase loans.  At December 31, 2019, LHFS totaled $226.3 million, consisting of $169.3 million of residential real estate mortgage loans in the process of being sold to third parties and $57.1 million of GNMA optional repurchase loans.  Please refer to the nonperforming assets table that follows for information on GNMA loans eligible for repurchase which are past due 90 days or more.

Trustmark did not exercise its buy-back option on any delinquent loans serviced for GNMA during the first three months of 2020 or 2019.

For additional information regarding the GNMA optional repurchase loans, please see the section captioned “Past Due LHFS” included in Note 3 – LHFI and Allowance for Loan Losses, LHFI of Part I. Item 1. – Financial Statements of this report.

LHFI

The full impact of the COVID-19 pandemic is unknown and rapidly evolving. It has caused substantial disruption in international and the United States economies, markets and employment. The outbreak may have a significant adverse impact on certain industries Trustmark serves, including the restaurant and food services, hotel, retail and energy industries.  See the section captioned “COVID-19 Update” for further information and discussion regarding the current and anticipated impact of the COVID-19 pandemic.

At March 31, 2020 and December 31, 2019, LHFI consisted of the following ($ in thousands):

	March 31, 2020 (1)					December 31, 2019
	Amount		%			Amount		%
Loans secured by real estate:
Construction, land development and other land	$	486,265		5.1	%	$	1,162,791		12.4	%
Other secured by 1-4 family residential properties		584,981		6.1	%		1,855,913		19.9	%
Secured by nonfarm, nonresidential properties		2,575,422		26.9	%		2,475,245		26.5	%
Other real estate secured		838,573		8.8	%		724,480		7.8	%
Other loans secured by real estate: (2)
Other construction		650,124		6.8	%		—		—
Secured by 1-4 family residential properties		1,267,084		13.2	%		—		—
Commercial and industrial loans		1,476,777		15.4	%		1,477,896		15.8	%
Consumer loans		173,678		1.8	%		175,738		1.9	%
State and other political subdivision loans		938,637		9.8	%		967,944		10.4	%
Other commercial loans (2)		576,379		6.1	%		495,621		5.3	%
LHFI	$	9,567,920		100.0	%	$	9,335,628		100.0	%

(1) Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

(2) In accordance with the guidance in FASB ASC Topic 326, Trustmark redefined its LHFI portfolio segments and related loan classes based on the level at which risk is monitored within the ACL methodology. The other loans secured by real estate portfolio segment and related loan classes were separated from the loans secured by real estate portfolio segment. The other construction loans were segregated from the construction, land development and other land loans. The other loans secured by 1-4 family residential properties were segregated from the loans secured by 1-4 family residential properties and the loans secured by 1-4 family residential properties were redefined in the other loans secured by real estate portfolio segment. Other loans were redefined as other commercial loans.

LHFI increased $232.3 million, or 2.5%, compared to December 31, 2019.  On January 1, 2020, Trustmark transferred $72.6 million, the remaining balance of the loans acquired in the BancTrust merger, from acquired impaired loans to LHFI as PCD loans as part of its adoption of FASB ASC Topic 326.  For additional information regarding the acquired loans transferred to LHFI, see the section captioned “Acquired Loans.”  Excluding the transferred acquired loans, LHFI increased $159.7 million, or 1.7%, compared to December 31, 2019.  The increase in LHFI, excluding the transferred acquired loans, during the first three months of 2020 was primarily due to net growth in LHFI secured by real estate in Trustmark’s Texas, Mississippi and Florida market regions as well as increases in other commercial loans in the Mississippi and Tennessee market regions, partially offset by declines in state and other political subdivision loans in Trustmark’s Mississippi market region.  The following discussion of changes in LHFI excludes the acquired loans transferred on January 1, 2020.

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LHFI secured by real estate increased $119.6 million, or 1.9%, during the first three months of 2020 primarily due to net growth in LHFI secured by other real estate and LHFI secured by nonfarm, nonresidential properties (NFNR LHFI), partially offset by declines in other construction loans and LHFI secured by 1-4 family residential properties.  LHFI secured by other real estate increased $110.1 million, or 15.1%, during the first three months of 2020, primarily due to other construction loans that moved to LHFI secured by multi-family residential properties in the Alabama, Mississippi and Texas market regions.  NFNR LHFI increased $62.0 million, or 2.5%, during the first three months of 2020, principally due to movement from the other construction loans category.  Excluding other construction loan reclassifications, the NFNR LHFI portfolio declined $39.2 million, or 1.6%, during the first three months of 2020 primarily due to declines in nonowner-occupied loans in the Texas and Alabama market regions and owner-occupied loans in the Mississippi and Alabama market regions.  Other construction loans decreased $28.1 million, or 4.1%, during the first three months of 2020 primarily due other construction loans moved to other loan categories upon the completion of the related construction project, which were largely offset by new construction loans.  During the first three months of 2020, $265.7 million loans were moved from other construction to other loan categories, including $164.3 million to multi-family residential loans, $76.4 million to nonowner-occupied loans and $25.0 million to owner-occupied loans.  Excluding all reclassifications between loan categories, growth in other construction loans across all five market regions totaled $237.4 million during the first three months of 2020.  LHFI secured by 1-4 family residential properties declined $18.1 million, or 1.4%, during the first three months of 2020, primarily due to declines in the Alabama and Mississippi market regions.

Other commercial loans, which include loans to churches, hospitals, finance companies and real estate investment trusts, increased $78.2 million, or 15.7%, during the first three months of 2020, primarily due to growth in the Mississippi and Tennessee market regions.  State and other political subdivision loans declined $29.3 million, or 3.0%, during the first three months of 2020, principally due to declines in the Mississippi market region.

Trustmark’s exposure to the energy sector is primarily included in the commercial and industrial loan portfolio in Trustmark’s Mississippi and Texas market regions.  At March 31, 2020 and December 31, 2019, energy-related LHFI had outstanding balances of $131.7 million and $122.9 million, respectively, which represented 1.4% of Trustmark’s total LHFI portfolio at March 31, 2020 compared to 1.3% of the total LHFI portfolio at December 31, 2019.  Trustmark has no loan exposure where the source of repayment, or the underlying security of such exposure, is tied to the realization of value from energy reserves.  Should oil prices fall below current levels for a prolonged period of time, there is potential for downgrades to occur.  Management will continue to monitor this exposure.  

The following table provides information regarding Trustmark’s home equity loans and home equity lines of credit which are included in the LHFI secured by 1-4 family residential properties for the periods presented ($ in thousands):

	March 31, 2020			December 31, 2019
Home equity loans	$	52,148		$	52,348
Home equity lines of credit		385,267			388,217
Percentage of loans and lines for which Trustmark holds first lien		59.0	%		59.4	%
Percentage of loans and lines for which Trustmark does not hold first lien		41.0	%		40.6	%

Due to the increased risk associated with second liens, loan terms and underwriting guidelines differ from those used for products secured by first liens.  Loan amounts and loan-to-value ratios are limited and are lower for second liens than first liens.  Also, interest rates and maximum amortization periods are adjusted accordingly.  In addition, regardless of lien position, the passing credit score for approval of all home equity lines of credit is higher than that of term loans.  The allowance for loan losses, LHFI is also reflective of the increased risk related to second liens through application of a greater loss factor to this portion of the portfolio.

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The following tables provide information regarding the interest rate terms of Trustmark’s LHFI as of March 31, 2020 and December 31, 2019 ($ in thousands).  Trustmark’s variable rate LHFI are based primarily on various prime and LIBOR interest rate bases.

	March 31, 2020
	Fixed		Variable		Total
Loans secured by real estate:
Construction, land development and other land	$	123,285	$	362,980	$	486,265
Other secured by 1- 4 family residential properties		44,026		540,955		584,981
Secured by nonfarm, nonresidential properties		1,450,469		1,124,953		2,575,422
Other real estate secured		197,661		640,912		838,573
Other loans secured by real estate:
Other construction		68,121		582,003		650,124
Secured by 1- 4 family residential properties		797,599		469,485		1,267,084
Commercial and industrial loans		519,408		957,369		1,476,777
Consumer loans		150,304		23,374		173,678
State and other political subdivision loans		892,764		45,873		938,637
Other commercial loans		283,821		292,558		576,379
LHFI	$	4,527,458	$	5,040,462	$	9,567,920

	December 31, 2019
	Fixed		Variable		Total
Loans secured by real estate:
Construction, land development and other land	$	201,055	$	961,736	$	1,162,791
Secured by 1- 4 family residential properties		1,004,079		851,834		1,855,913
Secured by nonfarm, nonresidential properties		1,430,132		1,045,113		2,475,245
Other real estate secured		189,023		535,457		724,480
Commercial and industrial loans		636,518		841,378		1,477,896
Consumer loans		152,970		22,768		175,738
State and other political subdivision loans		925,990		41,954		967,944
Other loans		310,475		185,146		495,621
LHFI	$	4,850,242	$	4,485,386	$	9,335,628

In the following tables, LHFI reported by region (along with related nonperforming assets and net charge-offs) are associated with location of origination except for loans secured by 1-4 family residential properties (representing traditional mortgages), credit cards and indirect consumer auto loans.  These loans are included in the Mississippi Region because they are centrally analyzed and approved as part of a specific line of business located at Trustmark’s headquarters in Jackson, Mississippi.

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The following table presents the LHFI composition by region at March 31, 2020 and reflects each region’s diversified mix of loans ($ in thousands):

	March 31, 2020
LHFI Composition by Region	Total		Alabama		Florida		Mississippi		Tennessee		Texas
Loans secured by real estate:
Construction, land development and other land	$	486,265	$	160,160	$	68,829	$	170,313	$	22,243	$	64,720
Other secured by 1-4 family residential properties		584,981		131,161		40,346		328,941		71,299		13,234
Secured by nonfarm, nonresidential properties		2,575,422		658,690		280,670		961,998		167,424		506,640
Other real estate secured		838,573		251,741		25,144		341,864		9,276		210,548
Other loans secured by real estate:
Other construction		650,124		198,137		21,055		137,736		1,311		291,885
Secured by 1-4 family residential properties		1,267,084		—		—		1,256,054		11,030		—
Commercial and industrial loans		1,476,777		214,041		20,612		699,930		315,542		226,652
Consumer loans		173,678		23,760		6,396		121,318		19,930		2,274
State and other political subdivision loans		938,637		109,422		38,763		582,098		26,717		181,637
Other commercial loans		576,379		81,241		15,558		365,208		84,024		30,348
LHFI	$	9,567,920	$	1,828,353	$	517,373	$	4,965,460	$	728,796	$	1,527,938
Construction, Land Development and Other Land Loans by Region
Lots	$	74,865	$	18,309	$	23,768	$	25,757	$	1,647	$	5,384
Development		63,640		14,326		7,505		29,130		4,938		7,741
Unimproved land		106,812		28,543		16,678		29,752		11,323		20,516
1-4 family construction		240,948		98,982		20,878		85,674		4,335		31,079
Construction, land development and other    land loans	$	486,265	$	160,160	$	68,829	$	170,313	$	22,243	$	64,720
Loans Secured by Nonfarm, Nonresidential Properties by Region
Nonowner-occupied:
Retail	$	443,057	$	162,375	$	41,536	$	137,615	$	27,531	$	74,000
Office		210,317		45,026		34,397		59,339		12,686		58,869
Hotel/motel		353,666		136,120		100,735		65,604		40,207		11,000
Mini-storage		109,009		12,112		3,520		49,479		420		43,478
Industrial		188,403		63,245		13,418		38,613		2,243		70,884
Health care		42,520		15,414		4,535		18,815		—		3,756
Convenience stores		27,116		3,496		—		11,243		410		11,967
Nursing homes/senior living		57,123		18,696		—		19,856		—		18,571
Other		66,085		5,238		6,892		11,120		5,959		36,876
Total nonowner-occupied loans		1,497,296		461,722		205,033		411,684		89,456		329,401
Owner-occupied:
Office		166,804		38,751		38,062		53,284		10,763		25,944
Churches		103,009		24,506		6,250		46,790		11,201		14,262
Industrial warehouses		152,128		12,425		3,517		49,776		16,829		69,581
Health care		129,995		15,391		6,006		93,260		2,515		12,823
Convenience stores		104,925		13,026		8,071		62,871		640		20,317
Retail		68,057		17,945		6,636		24,610		2,707		16,159
Restaurants		59,617		4,200		1,833		36,612		15,497		1,475
Auto dealerships		31,366		7,947		295		12,883		10,241		—
Nursing homes/senior living		179,065		58,271		—		115,015		5,779		—
Other		83,160		4,506		4,967		55,213		1,796		16,678
Total owner-occupied loans		1,078,126		196,968		75,637		550,314		77,968		177,239
Loans secured by nonfarm, nonresidential    properties	$	2,575,422	$	658,690	$	280,670	$	961,998	$	167,424	$	506,640

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Allowance for Credit Losses

LHFI

Trustmark adopted FASB ASC Topic 326, in accordance with the amendments of FASB ASU 2016-13, effective January 1, 2020.  The guidance in FASB ASC 326 replaces Trustmark’s previous incurred loss methodology with a methodology that reflects the current expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit losses.  Trustmark’s ACL methodology for LHFI is based upon guidance within FASB ASC Subtopic 326-20, “Financial Instruments – Credit Losses – Measured at Amortized Cost,” as well as regulatory guidance from its primary regulator.  The ACL is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans. Credit quality within the LHFI portfolio is continuously monitored by Management and is reflected within the ACL for loans.  The ACL is an estimate of expected losses inherent within Trustmark’s existing LHFI portfolio.  The ACL, LHFI is adjusted through the provision for credit losses and reduced by the charge off of loan amounts, net of recoveries.  

The loan loss estimation process involves procedures to appropriately consider the unique characteristics of Trustmark’s LHFI portfolio segments.  These segments are further disaggregated into loan classes, the level at which credit risk is monitored.  When computing allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history, delinquency status and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future.  Evaluations of the portfolio and individual credits are inherently subjective, as they require estimates, assumptions and judgments as to the facts and circumstances of particular situations.  Determining the appropriateness of the allowance is complex and requires judgement by Management about the effect of matters that are inherently uncertain.  In future periods, evaluations of the overall LHFI portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and credit loss expense.

For a complete description of Trustmark’s ACL methodology and the quantitative and qualitative factors included in the calculation, please see Note 3 – LHFI and Allowance for Credit Losses, LHFI included in Part I. Item 1. – Financial Statements of this report.

Upon adoption of FASB ASC Topic 326 on January 1, 2020, Trustmark recorded a decrease to the ACL, LHFI of $3.0 million and an increase of $1.8 million for the ACL calculated on the acquired loans transferred to LHFI as PCD loans.  At March 31, 2020, the ACL, LHFI was $100.6 million, an increase of $17.5 million, or 21.1%, when compared with January 1, 2020.  The increase in the ACL, LHFI during the first three months of 2020 was principally due to net changes in the economic forecast due to the current and anticipated negative effects of the COVID-19 pandemic on the overall economy and macroeconomic factors used in the quantitative calculation of the ACL.  Allocation of Trustmark’s $100.6 million ACL, LHFI, represented 0.97% of commercial LHFI and 1.35% of consumer and home mortgage LHFI, resulting in an ACL to total LHFI of 1.05% as of March 31, 2020.  This compares with an allowance to total LHFI of 0.90% at December 31, 2019, which was allocated to commercial LHFI at 0.98% and to consumer and mortgage LHFI at 0.61%.

The following table present changes in the ACL, LHFI for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	84,277		$	79,290
FASB ASU 2016-13 adoption adjustments:
LHFI		(3,039	)		—
Allowance for loan losses, acquired loans transfer		815			—
Acquired loans ACL adjustment		1,007			—
Provision for credit losses		20,581			1,611
LHFI charged-off		(5,545	)		(4,033	)
Recoveries		2,468			2,137
Net (charge-offs) recoveries		(3,077	)		(1,896	)
Balance at end of period	$	100,564		$	79,005

Charge-offs exceeded recoveries for the three months ended March 31, 2020 and 2019.  Net charge-offs for the three months ended March 31, 2020 increased $1.2 million, or 62.3%, when compared to the same time period in 2019, primarily due to two large commercial credits in the Tennessee and Alabama market regions that were charged off during the first quarter of 2020, partially offset by a decline in charge-offs in the Mississippi market region.

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The following table presents the net (charge-offs) recoveries by geographic market region for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Alabama	$	(1,080	)	$	(15	)
Florida		64			227
Mississippi		126			(2,130	)
Tennessee		(2,186	)		(50	)
Texas		(1	)		72
Total net (charge-offs) recoveries	$	(3,077	)	$	(1,896	)

The provision for credit losses for the three months ended March 31, 2020 totaled 0.86% of average loans (LHFS and LHFI), compared to 0.07% of average loans (LHFS and LHFI) for the same time period in 2019.  The increase in the provision for credit losses when the three months ended March 31, 2020 is compared to the same time period in 2019 was primarily due to net changes in the economic forecast due to the current and anticipated negative effects of the COVID-19 pandemic on the overall economy and macroeconomic factors used in the quantitative calculation of the ACL.

Off-Balance Sheet Credit Exposures

FASB ASC Topic 326 requires Trustmark to estimate expected credit losses for off-balance sheet credit exposures which are not unconditionally cancellable.  Trustmark maintains a separate ACL on off-balance sheet credit exposures, including unfunded loan commitments and letters of credit, which is included on the accompanying consolidated balance sheet as of March 31, 2020.  Upon adoption of FASB ASC Topic 326 on January 1, 2020, Trustmark recorded an ACL on off-balance sheet credit exposures of $29.6 million.

Expected credit losses for off-balance sheet credit exposures are estimated by calculating a commitment usage factor over the contractual period for exposures that are not unconditionally cancellable by Trustmark.  Trustmark generates a loan pool level unfunded amount for the period.  Trustmark calculates a funding rate each period which is applied to the pool unfunded commitment balances to ensure that reserves will be applied to the pool as Trustmark believes the pool will reach its historical levels.  Additionally, a total reserve rate is applied to the unfunded commitment balance.  The total reserve rate incorporates both quantitative and qualitative aspects of the current period’s expected credit loss rate.  The total reserve rate is loan pool specific and is applied to the unfunded amount to ensure loss factors, both quantitative and qualitative, are being considered on the unfunded portion of the loan pool, consistent with the methodology applied to the funded loan pools.  See the section captioned “Lending Related” in Note 13 – Contingencies included in Part I. Item 1. – Financial Statements of this report for complete description of Trustmark’s ACL methodology on off-balance sheet credit exposures.

Adjustments to the ACL on off-balance sheet credit exposures are recorded to credit loss expense related to off-balance sheet credit exposures in noninterest expense. Trustmark recorded a credit loss expense related to off-balance sheet credit exposures of $6.8 million during the first three months of 2020, resulting in an ACL on off-balance sheet credit exposures of $36.4 million as of March 31, 2020.  The increase in the ACL on off-balance sheet credit exposures for the first three months of 2020 was primarily due to net changes in the economic forecast due to the current and anticipated negative effects of the COVID-19 pandemic on the overall economy and macroeconomic factors used in the quantitative calculation of the ACL.

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Nonperforming Assets, Excluding Acquired Loans

The table below provides the components of nonperforming assets, excluding acquired loans, by geographic market region at March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020			December 31, 2019
Nonaccrual LHFI
Alabama	$	4,769		$	1,870
Florida		254			267
Mississippi		40,815			41,493
Tennessee		6,153			8,980
Texas		1,001			616
Total nonaccrual LHFI		52,992			53,226
Other real estate
Alabama		6,229			8,133
Florida		4,835			5,877
Mississippi		13,296			14,919
Tennessee		487			319
Texas		—			—
Total other real estate		24,847			29,248
Total nonperforming assets	$	77,839		$	82,474
Nonperforming assets/total loans (LHFI and LHFS) and ORE		0.78	%		0.86	%
Loans past due 90 days or more
LHFI	$	708		$	642
LHFS - Guaranteed GNMA serviced loans (1)	$	43,564		$	41,648

(1) No obligation to repurchase.

See the previous discussion of LHFS for more information on Trustmark’s serviced GNMA loans eligible for repurchase and the impact of Trustmark’s repurchases of delinquent mortgage loans under the GNMA optional repurchase program.

Nonaccrual LHFI

At March 31, 2020, nonaccrual LHFI totaled $53.0 million, or 0.54% of total LHFS and LHFI, reflecting a decrease of $234 thousand relative to December 31, 2019.  The decrease in nonaccrual LHFI during the first three months of 2020 was primarily due to reductions, pay-offs and charge-offs of nonaccrual LHFI in Trustmark’s Mississippi and Tennessee market regions, which were largely offset by LHFI placed on nonaccrual status in the Mississippi and Alabama market regions during the first quarter of 2020.  

As of March 31, 2020, nonaccrual energy-related LHFI totaled $11.0 million and represented 8.4% of Trustmark’s total energy-related portfolio, compared to $10.6 million, or 8.6% of Trustmark’s total energy-related portfolio, as of December 31, 2019.  For additional information regarding nonaccrual LHFI, see the section captioned “Nonaccrual and Past Due LHFI” included in Note 3 – LHFI and Allowance for Credit Losses, LHFI in Part I. Item 1. – Financial Statements of this report.

Other Real Estate

Other real estate at March 31, 2020 decreased $4.4 million, or 15.0%, when compared with December 31, 2019.  The decrease in other real estate was principally a result of properties sold and write-downs on foreclosed properties in Trustmark’s Alabama, Mississippi and Florida market regions.

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The following tables illustrate changes in other real estate by geographic market region for the periods presented ($ in thousands):

	Three Months Ended March 31, 2020
	Total			Alabama			Florida			Mississippi			Tennessee			Texas
Balance at beginning of period	$	29,248		$	8,133		$	5,877		$	14,919		$	319		$	—
Additions		336			77			—			27			232			—
Disposals		(3,741	)		(1,221	)		(987	)		(1,493	)		(40	)		—
Write-downs		(996	)		(760	)		(55	)		(157	)		(24	)		—
Balance at end of period	$	24,847		$	6,229		$	4,835		$	13,296		$	487		$	—

	Three Months Ended March 31, 2019
	Total			Alabama			Florida			Mississippi			Tennessee			Texas
Balance at beginning of period	$	34,668		$	6,873		$	8,771		$	17,255		$	1,025		$	744
Additions		785			525			—			260			—			—
Disposals		(1,658	)		(106	)		(320	)		(1,211	)		(21	)		—
Write-downs		(1,656	)		(414	)		(331	)		(883	)		(10	)		(18	)
Balance at end of period	$	32,139		$	6,878		$	8,120		$	15,421		$	994		$	726

Other real estate is revalued on an annual basis or more often if market conditions necessitate.  Subsequent to foreclosure, losses on the periodic revaluation of the property are charged against the reserve for other real estate write-downs or net income in other real estate expense, if a reserve does not exist.  Write-downs of other real estate decreased $660 thousand, or 39.9%, when the first three months of 2020 is compared to the same time period in 2019, primarily due to a decrease in write-downs of other real estate properties in the Mississippi market region.

For additional information regarding other real estate, please see Note 6 – Other Real Estate included in Part I. Item 1. – Financial Statements of this report.

Acquired Loans

Trustmark’s loss-share agreement with the FDIC covering the acquired covered loans secured by 1-4 family residential properties will expire in 2021.

Upon adoption of FASB ASC Topic 326, which was effective for Trustmark on January 1, 2020 in accordance with the amendments in FASB ASU 2016-13, Trustmark elected to account for its existing acquired loans as PCD loans included within the LHFI portfolio. Trustmark elected to maintain pools of loans that were previously accounted for under FASB ASC Subtopic 310-30, “Receivables – Loans and Debt Securities Acquired with Deteriorated Credit Quality,” and will continue to account for these pools as a unit of account.  Loans are only removed from the existing loan pools if they are written off, paid off or sold.  Upon adoption of FASB ASC Topic 326, the ACL was determined for each pool and added to the pool’s carrying value to establish a new amortized cost basis.  The difference between the unpaid principal balance of the pool and the new amortized cost basis is the noncredit premium or discount which will be amortized into interest income over the remaining life of the pool.  Changes to the ACL after adoption of FASB ASC Topic 326 are recorded through the provision for credit losses.

As a result of adopting FASB ASC Topic 326, Trustmark transferred $72.6 million of acquired loans, $815 thousand of related allowance for loan losses, acquired loans as well as $1.0 million of ACL calculated for these loans to LHFI on January 1, 2020.  The acquired loans and related allowance transferred were acquired in the BancTrust merger.

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As of  December 31, 2019, acquired loans consisted of the following ($ in thousands):

	December 31, 2019
Loans secured by real estate:
Construction, land development and other land	$	4,771
Secured by 1-4 family residential properties		17,525
Secured by nonfarm, nonresidential properties		38,206
Other real estate secured		3,946
Commercial and industrial loans		5,035
Consumer loans		520
Other loans		2,598
Acquired loans		72,601
Less allowance for loan losses, acquired loans		815
Net acquired loans	$	71,786

For additional information regarding acquired loans, including changes in the net carrying value, see Note 4 – Acquired Loans included in Part I. Item 1. – Financial Statements of this report.

Deposits

Trustmark’s deposits are its primary source of funding and consist of core deposits from the communities Trustmark serves.  Deposits include interest-bearing and noninterest-bearing demand accounts, savings, money market, certificates of deposit and individual retirement accounts.  Total deposits were $11.576 billion at March 31, 2020 compared to $11.246 billion at December 31, 2019, an increase of $330.2 million, or 2.9%.  During the first three months of 2020, noninterest-bearing deposits increased $85.8 million, or 3.0%, primarily due to growth in all categories of noninterest-bearing deposit accounts.  Interest-bearing deposits increased $244.4 million, or 2.9%, during the first three months of 2020, primarily due to growth in public and commercial interest checking accounts and commercial money market deposit accounts.

Borrowings

Trustmark uses short-term borrowings, such as federal funds purchased, securities sold under repurchase agreements and short-term FHLB advances, to fund growth of earning assets in excess of deposit growth.  See the section captioned “Liquidity” for further discussion of the components of Trustmark’s excess funding capacity.

Federal funds purchased and securities sold under repurchase agreements totaled $421.8 million at March 31, 2020 compared to $256.0 million at December 31, 2019, an increase of $165.8 million, or 64.8%.  Of these amounts $63.8 million and $62.5 million, respectively, represented customer related transactions, such as commercial sweep repurchase balances.  Excluding customer related transactions, Trustmark had $358.0 million of upstream federal funds purchased at March 31, 2020, compared to $193.5 million at December 31, 2019.  The increase in the upstream federal funds purchased during the first three months of 2020, was primarily a result of changes in funding needs as growth in earning assets exceeded deposit growth.

Other borrowings totaled $84.2 million at March 31, 2020, a decrease of $1.2 million, or 1.4%, when compared with $85.4 million at December 31, 2019.  

Legal Environment

Information required in this section is set forth under the heading “Legal Proceedings” of Note 13 – Contingencies included in Part I. Item 1. – Financial Statements of this report.

Off-Balance Sheet Arrangements

Information required in this section is set forth under the heading “Lending Related” of Note 13 – Contingencies included in Part I. Item 1. – Financial Statements of this report.

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Contractual Obligations

Payments due from Trustmark under specified long-term and certain other binding contractual obligations were scheduled in Trustmark’s 2019 Annual Report.  The most significant obligations, other than obligations under deposit contracts and short-term borrowings, were for operating leases for banking facilities.  There have been no material changes in Trustmark’s contractual obligations since year-end.

Capital Resources

At March 31, 2020, Trustmark’s total shareholders’ equity was $1.652 billion, a decrease of $8.3 million, or 0.5%, when compared to December 31, 2019.  During the first three months of 2020, shareholders’ equity decreased primarily as a result of a $19.9 million, net of tax, adjustment to the beginning balance of retained earnings as a result of the adoption of FASB ASU 2016-13, common stock repurchases of $27.5 million and common stock dividends of $14.7 million, partially offset by net income of $22.2 million and improvements in the fair market value of securities available for sale, net of tax, of $30.4 million.  Trustmark utilizes a capital model in order to provide Management with a monthly tool for analyzing changes in its strategic capital ratios.  This allows Management to hold sufficient capital to provide for growth opportunities and protect the balance sheet against sudden adverse market conditions, while maintaining an attractive return on equity to shareholders.

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 2019 Annual Report, which are administered by the federal bank regulatory agencies.  These capital requirements, as defined by federal regulations, involve quantitative and qualitative measures of assets, liabilities and certain off-balance sheet instruments.  Trustmark’s and TNB’s minimum risk-based capital requirements include a capital conservation buffer of 2.50% at March 31, 2020 and December 31, 2019.  AOCI is not included in computing regulatory capital.  Trustmark has elected the five-year phase-in transition period 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 March 31, 2020, Trustmark and TNB exceeded all applicable minimum capital standards.  In addition, Trustmark and TNB met applicable regulatory guidelines to be considered well-capitalized at March 31, 2020.  To be categorized in this manner, Trustmark and TNB maintained minimum common equity Tier 1 risk-based capital, Tier 1 risk-based capital, total risk-based capital and Tier 1 leverage ratios, 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 March 31, 2020, which Management believes have affected Trustmark’s or TNB’s present classification.  

In 2006, Trustmark enhanced its capital structure with the issuance of trust preferred securities.  For regulatory capital purposes, the trust preferred securities currently qualify as Tier 1 capital.  Trustmark intends to continue to utilize $60.0 million in trust preferred securities issued by Trustmark Preferred Capital Trust I (the Trust) as Tier 1 capital up to the regulatory limit, as permitted by the grandfather provision in the Dodd-Frank Act and the Basel III Final Rule.

Refer to the section captioned “Regulatory Capital” included in Note 16 – Shareholders’ Equity in Part I. Item 1. – Financial Statements of this report for an illustration of Trustmark’s and TNB’s actual regulatory capital amounts and ratios under regulatory capital standards in effect at March 31, 2020 and December 31, 2019.

Dividends on Common Stock

Dividends per common share for the three months ended March 31, 2020 and 2019 were $0.23.  Trustmark’s indicated dividend for 2020 is $0.92 per common share, which is the same as dividends per common share as declared in 2019.

Stock Repurchase Program

The Board of Directors of Trustmark authorized a stock repurchase program effective April 1, 2019, under which $100.0 million of Trustmark’s outstanding common shares could be acquired through March 31, 2020.  Trustmark repurchased approximately 887 thousand shares of its outstanding common stock valued at $27.5 million during the three months ended March 31, 2020.  Under this authority, Trustmark repurchased approximately 1.5 million shares valued at $47.2 million.

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On January 28, 2020, the Board of Directors of Trustmark authorized a new stock repurchase program, effective April 1, 2020, under which $100.0 million of Trustmark’s outstanding common stock may be acquired through December 31, 2021.  The shares may be purchased from time to time at prevailing market prices, through open market or private transactions, depending on market conditions.  There is no guarantee as to the number of shares that may be repurchased by Trustmark, and Trustmark may discontinue purchases under the program at any time at Management’s discretion.  

On March 9, 2020, Trustmark suspended its share repurchase programs to preserve capital to support customers during the COVID-19 pandemic.

Liquidity

Liquidity is the ability to ensure that sufficient cash flow and liquid assets are available to satisfy current and future financial obligations, including demand for loans and deposit withdrawals, funding operating costs and other corporate purposes.  Consistent cash flows from operations and adequate capital provide internally generated liquidity.  Furthermore, Management maintains funding capacity from a variety of external sources to meet daily funding needs, such as those required to meet deposit withdrawals, loan disbursements and security settlements.  Liquidity strategy also includes the use of wholesale funding sources to provide for the seasonal fluctuations of deposit and loan demand and the cyclical fluctuations of the economy that impact the availability of funds.  Management keeps excess funding capacity available to meet potential demands associated with adverse circumstances.

The asset side of the balance sheet provides liquidity primarily through maturities and cash flows from loans and securities as well as the ability to sell certain loans and securities while the liability portion of the balance sheet provides liquidity primarily through noninterest and interest-bearing deposits.  Trustmark utilizes federal funds purchased, FHLB advances, securities sold under repurchase agreements as well as the Federal Reserve Discount Window (Discount Window) and, on a limited basis as discussed below, brokered deposits to provide additional liquidity.  Access to these additional sources represents Trustmark’s incremental borrowing capacity.

Deposit accounts represent Trustmark’s largest funding source.  Average deposits totaled to $11.359 billion for the first three months of 2020 and represented approximately 83.3% of average liabilities and shareholders’ equity, compared to average deposits of $11.392 billion, which represented 84.8% of average liabilities and shareholders’ equity for the first three months of 2019.

Trustmark utilizes a limited amount of brokered deposits to supplement other wholesale funding sources.  At March 31, 2020, brokered sweep Money Market Deposit Account (MMDA) deposits totaled $27.3 million compared to $26.2 million at December 31, 2019.

At March 31, 2020, Trustmark had $358.0 million of upstream federal funds purchased, compared to $193.5 million at December 31, 2019.  The increase in the upstream federal funds purchased during the first three months of 2020, was primarily a result of changes in funding needs as growth in earning assets exceeded deposit growth.  Trustmark maintains adequate federal funds lines to provide sufficient short-term liquidity.  

Trustmark maintains a relationship with the FHLB of Dallas, which provided no outstanding short-term or long-term advances at March 31, 2020 and December 31, 2019.  Under the existing borrowing agreement, Trustmark had sufficient qualifying collateral to increase FHLB advances with the FHLB of Dallas by $3.196 billion at March 31, 2020.  

In addition, at March 31, 2020, Trustmark had $794 thousand in long-term FHLB advances outstanding with the FHLB of Atlanta, which were acquired in the BancTrust merger, compared to $811 thousand at December 31, 2019.  Trustmark has non-member status and thus no additional borrowing capacity with the FHLB of Atlanta.

Additionally, Trustmark has the ability to leverage its unencumbered investment securities as collateral.  At March 31, 2020, Trustmark had approximately $594.0 million available in unencumbered agency securities compared to $546.0 million at December 31, 2019.

Another borrowing source is the Discount Window.  At March 31, 2020, Trustmark had approximately $1.002 billion available in collateral capacity at the Discount Window primarily from pledges of commercial and industrial LHFI, compared with $982.7 billion at December 31, 2019.

Additionally, on March 15, 2020, in response to the COVID-19 pandemic, the FRB reduced reserve requirements for insured depository institutions to zero percent, which increased TNB’s available liquidity.

The PPPLF was established by the FRB to provide a liquidity source to PPP lenders, through non-recourse credit secured by PPP loans.  The PPPLF is available to Trustmark as a liquidity source as needed.

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During 2006, Trustmark completed a private placement of $60.0 million of trust preferred securities through a newly formed Delaware trust affiliate, the Trust.  The trust preferred securities mature September 30, 2036 and are redeemable at Trustmark’s option.  The proceeds from the sale of the trust preferred securities were used by the Trust to purchase $61.9 million in aggregate principal amount of Trustmark’s junior subordinated debentures.

The Board of Directors of Trustmark currently has the authority to issue up to 20.0 million preferred shares with no par value.  The ability to issue preferred shares in the future will provide Trustmark with additional financial and management flexibility for general corporate and acquisition purposes.  At March 31, 2020, Trustmark had no shares of preferred stock issued and outstanding.

Liquidity position and strategy are reviewed regularly by Management and continuously adjusted in relationship to Trustmark’s overall strategy.  Management believes that Trustmark has sufficient liquidity and capital resources to meet presently known cash flow requirements arising from ongoing business transactions.

Asset/Liability Management

Overview

Market risk reflects the potential risk of loss arising from adverse changes in interest rates and market prices.  Trustmark has risk management policies to monitor and limit exposure to market risk.  Trustmark’s primary market risk is interest rate risk created by core banking activities.  Interest rate risk is the potential variability of the income generated by Trustmark’s financial products or services, which results from changes in various market interest rates.  Market rate changes may take the form of absolute shifts, variances in the relationships between different rates and changes in the shape or slope of the interest rate term structure.

Management continually develops and applies cost-effective strategies to manage these risks.  Management’s Asset/Liability Committee sets the day-to-day operating guidelines, approves strategies affecting net interest income and coordinates activities within policy limits established by the Board of Directors of Trustmark.  A key objective of the asset/liability management program is to quantify, monitor and manage interest rate risk and to assist Management in maintaining stability in the net interest margin under varying interest rate environments.

Derivatives

Trustmark uses financial derivatives for management of interest rate risk.  Management’s Asset/Liability Committee, in its oversight role for the management of interest rate risk, approves the use of derivatives in balance sheet hedging strategies.  The most common derivatives employed by Trustmark are interest rate lock commitments, forward contracts (both futures contracts and options on futures contracts), interest rate swaps, interest rate caps and interest rate floors.  As a general matter, the values of these instruments are designed to be inversely related to the values of the assets that they hedge (i.e., if the value of the hedged asset falls, the value of the related hedge rises).  In addition, Trustmark has entered into derivatives contracts as counterparty to one or more customers in connection with loans extended to those customers.  These transactions are designed to hedge interest rate, currency or other exposures of the customers and are not entered into by Trustmark for speculative purposes.  Increased federal regulation of the derivatives markets may increase the cost to Trustmark to administer derivatives programs.

On April 4, 2013, Trustmark entered into a forward interest rate swap contract on junior subordinated debentures with a total notional amount of $60.0 million.  The interest rate swap contract was designated as a derivative instrument in a cash flow hedge under FASB ASC Topic 815, with the objective of protecting the quarterly interest payments on Trustmark’s $60.0 million of junior subordinated debentures issued to the Trust throughout the five-year period which began December 31, 2014 and ended December 31, 2019 from the risk of variability of those payments resulting from changes in the three-month LIBOR interest rate.  Under the swap, which became effective on December 31, 2014, Trustmark paid a fixed interest rate of 1.66% and received a variable interest rate based on three-month LIBOR on a total notional amount of $60.0 million, with quarterly net settlements.

The interest rate swap matured on December 31, 2019; therefore, there was no accumulated net after-tax amount related to the effective cash flow hedge included in AOCI at December 31, 2019.  No ineffectiveness related to the interest rate swap designated as a cash flow hedge was recognized in the consolidated statements of income during the three months ended March 31, 2019.  Amounts reported in AOCI related to this derivative were reclassified to other interest expense as interest payments were made on Trustmark’s variable rate junior subordinated debentures.

As part of Trustmark’s risk management strategy in the mortgage banking business, various derivative instruments such as interest rate lock commitments and forward sales contracts are utilized.  Rate lock commitments are residential mortgage loan commitments with customers, which guarantee a specified interest rate for a specified period of time.  Trustmark’s obligations under forward contracts consist of commitments to deliver mortgage loans, originated and/or purchased, in the secondary market at a future date.  

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The gross notional amount of Trustmark’s off-balance sheet obligations under these derivative instruments totaled $836.7 million at March 31, 2020, with a positive valuation adjustment of $507 thousand, compared to $301.1 million, with a positive valuation adjustment of $953 thousand at December 31, 2019.

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 fair value of the MSR attributable to interest rates.  These transactions are considered freestanding derivatives that do not otherwise qualify for hedge accounting under GAAP.  The total notional amount of these derivative instruments was $516.5 million at March 31, 2020 compared to $564.0 million at December 31, 2019.  These exchange-traded derivative instruments are accounted for at fair value with changes in the fair value recorded as noninterest income in mortgage banking, net and are offset by the changes in the fair value of the MSR.  The MSR fair value represents the present value of future cash flows, which among other things includes decay and the effect of changes in interest rates.  Ineffectiveness of hedging the MSR fair value is measured by comparing the change in value of hedge instruments to the change in the fair value of the MSR asset attributable to changes in interest rates and other market driven changes in valuation inputs and assumptions.  The impact of this strategy resulted in a net positive ineffectiveness of $9.9 million and a net negative ineffectiveness of $4.7 million for the three months ended March 31, 2020 and 2019, respectively.

Trustmark offers certain interest rate derivatives products directly to qualified commercial lending clients seeking to manage their interest rate risk under loans they have entered into with TNB.  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 under GAAP and are, therefore, carried on Trustmark’s financial statements 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.  As of March 31, 2020, Trustmark had interest rate swaps with an aggregate notional amount of $905.6 million related to this program, compared to $893.1 million as of December 31, 2019.

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 deemed to be in default on its derivatives obligations.

As of March 31, 2020, the termination value of interest rate swaps in a liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $2.8 million compared to $1.0 million at December 31, 2019.  As of March 31, 2020, Trustmark had posted collateral of $2.8 million against its obligations because of negotiated thresholds and minimum transfer amounts under these agreements.  If Trustmark had breached any of these triggering provisions at March 31, 2020, it could have been required to settle its obligations under the agreements at the termination value (which is expected to approximate fair market 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 both March 31, 2020 and December 31, 2019, Trustmark had entered into three risk participation agreements as a beneficiary with an aggregate notional amount of $37.2 million and $37.6 million, respectively.  At March 31, 2020, Trustmark had entered into nine risk participation agreements as a guarantor with an aggregate notional amount of $74.9 million, compared to ten risk participation agreements as a guarantor with an aggregate notional amount of $79.3 million at December 31, 2019.  The aggregate fair values of these risk participation agreements were immaterial at March 31, 2020 and December 31, 2019.

Trustmark’s participation in the derivatives markets is subject to increased federal regulation of these markets.  Trustmark believes that it may continue to use financial derivatives to manage interest rate risk and also to offer derivatives products to certain qualified commercial lending clients in compliance with the Volcker Rule.  However, the increased federal regulation of the derivatives markets has increased the cost to Trustmark of administering its derivatives programs.  Some of these costs (particularly compliance costs related to the Volcker Rule and other federal regulations) are expected to recur in the future.

Market/Interest Rate Risk Management

The primary purpose in managing interest rate risk is to invest capital effectively and preserve the value created by the core banking business.  This is accomplished through the development and implementation of lending, funding, pricing and hedging strategies designed to maximize net interest income performance under varying interest rate environments subject to specific liquidity and interest rate risk guidelines.

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Financial simulation models are the primary tools used by Management’s Asset/Liability Committee to measure interest rate exposure.  Using a wide range of scenarios, Management is provided with extensive information on the potential impact on net interest income caused by changes in interest rates.  Models are structured to simulate cash flows and accrual characteristics of Trustmark’s balance sheet.  Assumptions are made about the direction and volatility of interest rates, the slope of the yield curve and the changing composition of Trustmark’s balance sheet, resulting from both strategic plans and customer behavior.  In addition, the model incorporates Management’s assumptions and expectations regarding such factors as loan and deposit growth, pricing, prepayment speeds and spreads between interest rates.

Based on the results of the simulation models using static balances, the table below summarizes the effect various one-year interest rate shift scenarios would have on net interest income compared to a base case, flat scenario at March 31, 2020 and 2019.  At March 31, 2020 and 2019, the impact of a 200-basis point drop scenario was not calculated due to the low interest rate environment.

	Estimated % Change in Net Interest Income
Change in Interest Rates	2020			2019
+200 basis points		5.9	%		2.0	%
+100 basis points		3.0	%		1.1	%
-100 basis points		-10.9	%		-1.8	%

Management cannot provide any assurance about the actual effect of changes in interest rates on net interest income.  The estimates provided do not include the effects of possible strategic changes in the balances of various assets and liabilities throughout 2020 or additional actions Trustmark could undertake in response to changes in interest rates.  Management will continue to prudently manage the balance sheet in an effort to control interest rate risk and maintain profitability over the long term.

Another component of interest rate risk management is measuring the economic value-at-risk for a given change in market interest rates.  The economic value-at-risk may indicate risks associated with longer-term balance sheet items that may not affect net interest income at risk over shorter time periods.  Trustmark uses computer-modeling techniques to determine the present value of all asset and liability cash flows (both on- and off-balance sheet), adjusted for prepayment expectations, using a market discount rate.  The economic value of equity (EVE), also known as net portfolio value, is defined as the difference between the present value of asset cash flows and the present value of liability cash flows.  The resulting change in EVE in different market rate environments, from the base case scenario, is the amount of EVE at risk from those rate environments.  The following table summarizes the effect that various interest rate shifts would have on net portfolio value at March 31, 2020 and 2019.  At March 31, 2020 and 2019, the impact of a 200-basis point drop scenario was not calculated due to the low interest rate environment.

	Estimated % Change in Net Portfolio Value
Change in Interest Rates	2020			2019
+200 basis points		8.7	%		0.3	%
+100 basis points		5.6	%		0.8	%
-100 basis points		-13.8	%		-3.2	%

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.  The model incorporates assumptions that market participants use in estimating future net servicing income, including estimates of prepayment speeds, discount rate, default rates, cost to service (including delinquency and foreclosure costs), escrow account earnings, contractual servicing fee income and other ancillary income such as late fees.  Management reviews all significant assumptions quarterly.  Mortgage loan prepayment speeds, a key assumption in the model, is the annual rate at which borrowers are forecasted to repay their mortgage loan principal.  The discount rate used to determine the present value of estimated future net servicing income, another key assumption in the model, is an estimate of the required rate of return investors in the market would require for an asset with similar risk.  Both assumptions can, and generally will, change as market conditions and interest rates change.

By way of example, an increase in either the prepayment speed 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.  In recent years, there have been significant market-driven fluctuations in loan prepayment speeds and discount rates.  These fluctuations can be rapid and may continue to be significant.  Therefore, estimating prepayment speed and/or discount rates within ranges that market participants would use in determining the fair value of the MSR requires significant management judgment.

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At March 31, 2020, the MSR fair value was $56.4 million, compared to $86.8 million at March 31, 2019.  The impact on the MSR fair value of a 10% adverse change in prepayment speed or a 100 basis point increase in discount rate at March 31, 2020, would be a decline in fair value of approximately $3.8 million and $1.7 million, respectively, compared to a decline in fair value of approximately $3.4 million and $3.1 million, respectively, at March 31, 2019.  Changes of equal magnitude in the opposite direction would produce similar increases in fair value in the respective amounts.

Critical Accounting Policies

Trustmark’s accounting policies are fundamental to understanding of Management’s discussion and analysis of Trustmark’s results of operations and financial condition.  Trustmark has identified critical accounting policies which involve a higher degree of judgment and complexity in making certain estimates and assumptions that affect amounts reported in its consolidated financial statements.  Certain accounting estimates are important to the portrayal of Trustmark’s financial condition, as they require Management to make difficult, complex or subjective judgments, some of which may relate to matters that are inherently uncertain.  Accounting estimates are susceptible to material changes as a result of changes in facts and circumstances, which include, but are not limited to, changes in interest rates, changes in the performance of the economy, including COVID-19 related changes and changes in the financial condition of borrowers.  For an overview of Trustmark’s critical accounting policies at December 31, 2019, see the section captioned “Critical Accounting Policies” included in Part II. Item 7. – Management’s Discussion and Analysis of Financial Condition and Results of Operations, of Trustmark’s 2019 Annual Report.

For additional information regarding Trustmark’s basis of presentation and accounting policies, see Note 1 – Business, Basis of Financial Statement Presentation and Principles of Consolidation included in Part I. Item 1. – Financial Statements of this report.

On January 1, 2020, Trustmark adopted FASB ASU 2016-13, which created material changes to Trustmark’s allowance for loan losses, LHFI critical accounting policy that existed at December 31, 2019.  The allowance for loan losses, LHFI critical accounting policy was replaced with the allowance for credit losses, LHFI critical accounting policy presented below effective January 1, 2020.

Allowance for Credit Losses, LHFI

The allowance for credit losses (ACL), LHFI is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans.  Credit quality within the LHFI portfolio is continuously monitored by Management and is reflected within the ACL for loans.  The ACL is an estimate of expected losses inherent within Trustmark’s existing LHFI portfolio.  The ACL for LHFI is adjusted through the provision for credit losses and reduced by the charge off of loan amounts, net of recoveries.  

The loan loss estimation process involves procedures to appropriately consider the unique characteristics of Trustmark’s LHFI portfolio segments.  These segments are further disaggregated into loan classes, the level at which credit risk is monitored.  When computing allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history, delinquency status and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future.  Evaluations of the portfolio and individual credits are inherently subjective, as they require estimates, assumptions and judgments as to the facts and circumstances of particular situations.  Determining the appropriateness of the allowance is complex and requires judgement by Management about the effect of matters that are inherently uncertain.  In future periods, evaluations of the overall LHFI portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and credit loss expense in those future periods.  Given the nature of many of the factors, forecasts and assumptions in the ACL methodology, it is not possible to provide meaningful estimates of the impact of any such potential change.

For a complete description of Trustmark’s ACL methodology for the LHFI portfolio, please see Note 3 – LHFI and Allowance for Credit Losses, LHFI included in Part I. Item 1. – Financial Statements of this report.

Accounting Policies Recently Adopted and Pending Accounting Pronouncements

For a complete list of recently adopted and pending accounting policies and the impact on Trustmark, see Note 20 – Accounting Policies Recently Adopted and Pending Accounting Pronouncements included in Part I. Item 1. – Financial Statements of this report.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The information required by this item is included in the discussion of Market/Interest Rate Risk Management found in Management’s Discussion and Analysis.

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ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

As of the end of the period covered by this Quarterly Report on Form 10-Q, an evaluation was carried out by Trustmark’s Management, with the participation of its Chief Executive Officer and Treasurer and Principal Financial Officer (Principal Financial Officer), of the effectiveness of Trustmark’s disclosure controls and procedures (as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934). Based on that evaluation, the Chief Executive Officer and the Principal Financial Officer concluded that Trustmark’s disclosure controls and procedures were effective as of the end of the period covered by this report.

Changes in Internal Control over Financial Reporting

Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13.  Trustmark implemented changes to its policies, processes and controls over the estimation of the allowance for credit losses to support the adoption of FASB ASU 2016-13.  Management revised previous internal controls used under legacy GAAP and incorporated new internal controls to ensure adequacy of the reserve levels under the new allowance for credit losses methodology.  Changes to internal controls as a result of adopting FASB ASU 2016-13 were a result of changes in the calculation under the new allowance for credit losses methodology and did not change the overall nature of the controls.  There has been no change in Trustmark’s internal control over financial reporting during the last fiscal quarter that has materially affected, or is reasonably likely to materially affect, Trustmark’s internal control over financial reporting.

PART II.    OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

Trustmark’s wholly-owned subsidiary, TNB, has been named as a defendant in several lawsuits related to the collapse of the Stanford Financial Group.  

On August 23, 2009, a purported class action complaint was filed in the District Court of Harris County, Texas, by Peggy Roif Rotstain, Guthrie Abbott, Catherine Burnell, Steven Queyrouze, Jaime Alexis Arroyo Bornstein and Juan C. Olano (collectively, Class Plaintiffs), on behalf of themselves and all others similarly situated, naming TNB and four other financial institutions and one individual, each of which are unaffiliated with Trustmark, as defendants.  The complaint seeks to recover (i) alleged fraudulent transfers from each of the defendants in the amount of fees and other monies received by each defendant from entities controlled by R. Allen Stanford (collectively, the Stanford Financial Group) and (ii) damages allegedly attributable to alleged conspiracies by one or more of the defendants with the Stanford Financial Group to commit fraud and/or aid and abet fraud on the asserted grounds that defendants knew or should have known the Stanford Financial Group was conducting an illegal and fraudulent scheme.  Class Plaintiffs have demanded a jury trial.  Class Plaintiffs did not quantify damages.

In November 2009, the lawsuit was removed to federal court by certain defendants and then transferred by the United States Panel on Multidistrict Litigation to federal court in the Northern District of Texas (Dallas) where multiple Stanford related matters are being consolidated for pre-trial proceedings.  In May 2010, all defendants (including TNB) filed motions to dismiss the lawsuit.  In August 2010, the court authorized and approved the formation of an Official Stanford Investors Committee (OSIC) to represent the interests of Stanford investors and, under certain circumstances, to file legal actions for the benefit of Stanford investors.  In December 2011, the OSIC filed a motion to intervene in this action.  In September 2012, the district court referred the case to a magistrate judge for hearing and determination of certain pretrial issues.  In December 2012, the court granted the OSIC’s motion to intervene, and the OSIC filed an Intervenor Complaint against one of the other defendant financial institutions.  In February 2013, the OSIC filed a second Intervenor Complaint that asserts claims against TNB and the remaining defendant financial institutions.  The OSIC seeks to recover: (i) alleged fraudulent transfers in the amount of the fees each of the defendants allegedly received from Stanford Financial Group, the profits each of the defendants allegedly made from Stanford Financial Group deposits, and other monies each of the defendants allegedly received from Stanford Financial Group; (ii) damages attributable to alleged conspiracies by each of the defendants with the Stanford Financial Group to commit fraud and/or aid and abet fraud and conversion on the asserted grounds that the defendants knew or should have known the Stanford Financial Group was conducting an illegal and fraudulent scheme; and (iii) punitive damages.  The OSIC did not quantify damages.  

In July 2013, all defendants (including TNB) filed motions to dismiss the OSIC’s claims.  In March 2015, the court entered an order authorizing the parties to conduct discovery regarding class certification, staying all other discovery and setting a deadline for the parties to complete briefing on class certification issues.  In April 2015, the court granted in part and denied in part the defendants’ motions to dismiss the Class Plaintiffs’ claims and the OSIC’s claims.  The court dismissed all of the Class Plaintiffs’ fraudulent transfer claims and dismissed certain of the OSIC’s claims.  The court denied the motions by TNB and the other financial institution defendants to dismiss the OSIC’s constructive fraudulent transfer claims.  

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On June 23, 2015, the court allowed the Class Plaintiffs to file a Second Amended Class Action Complaint (SAC), which asserted new claims against TNB and certain of the other defendants for (i) aiding, abetting and participating in a fraudulent scheme, (ii) aiding, abetting and participating in violations of the Texas Securities Act, (iii) aiding, abetting and participating in breaches of fiduciary duty, (iv) aiding, abetting and participating in conversion and (v) conspiracy.  On July 14, 2015, the defendants (including TNB) filed motions to dismiss the SAC and to reconsider the court’s prior denial to dismiss the OSIC’s constructive fraudulent transfer claims against TNB and the other financial institutions that are defendants in the action.  On July 27, 2016, the court denied the motion by TNB and the other financial institution defendants to dismiss the SAC and also denied the motion by TNB and the other financial institution defendants to reconsider the court’s prior denial to dismiss the OSIC’s constructive fraudulent transfer claims.  On August 24, 2016, TNB filed its answer to the SAC.  On October 20, 2017, the OSIC filed a motion seeking an order lifting the discovery stay and establishing a trial schedule.  On November 4, 2016, the OSIC filed a First Amended Intervenor Complaint, which added claims for (i) aiding, abetting or participation in violations of the Texas Securities Act and (ii) aiding, abetting or participation in the breach of fiduciary duty.  On November 7, 2017, the court denied the Class Plaintiffs’ motion seeking class certification and designation of class representatives and counsel, finding that common issues of fact did not predominate.  The court granted the OSIC’s motion to lift the discovery stay that it had previously ordered.

On May 3, 2019, individual investors and entities filed motions to intervene in the action.  On September 18, 2019, the court denied the motions to intervene.  On October 14, 2019, certain of the proposed intervenors filed a notice of appeal.

On December 14, 2009, a different Stanford-related lawsuit was filed in the District Court of Ascension Parish, Louisiana, individually by Harold Jackson, Paul Blaine and Carolyn Bass Smith, Christine Nichols, and Ronald and Ramona Hebert naming TNB (misnamed as Trust National Bank) and other individuals and entities not affiliated with Trustmark as defendants.  The complaint seeks to recover the money lost by these individual plaintiffs as a result of the collapse of the Stanford Financial Group (in addition to other damages) under various theories and causes of action, including negligence, breach of contract, breach of fiduciary duty, negligent misrepresentation, detrimental reliance, conspiracy, and violation of Louisiana’s uniform fiduciary, securities, and racketeering laws.  The complaint does not quantify the amount of money the plaintiffs seek to recover.  In January 2010, the lawsuit was removed to federal court by certain defendants and then transferred by the United States Panel on Multidistrict Litigation to federal court in the Northern District of Texas (Dallas) where multiple Stanford related matters are being consolidated for pre-trial proceedings.  On March 29, 2010, the court stayed the case.  TNB filed a motion to lift the stay, which was denied on February 28, 2012.  In September 2012, the district court referred the case to a magistrate judge for hearing and determination of certain pretrial issues.

On April 11, 2016, Trustmark learned that a different Stanford-related lawsuit had been filed on that date in the Superior Court of Justice in Ontario, Canada, by The Toronto-Dominion Bank (“TD Bank”), naming TNB and three other financial institutions not affiliated with Trustmark as defendants.  The 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 a 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.  To date, TNB has not been served in connection with this action.

On November 1, 2019, TNB was named as a defendant in a complaint filed by Paul Blaine Smith, Carolyn Bass Smith and other plaintiffs identified therein (the Smith Complaint).  The Smith Complaint was filed in District Court, Harris County, Texas and named TNB and four other financial institutions and one individual, each of which are unaffiliated with Trustmark, as defendants.  The Smith Complaint relates to the collapse of the Stanford Financial Group, as does the other pending litigation relating to Stanford summarized above.  Plaintiffs in the Smith Complaint have demanded a jury trial.

On January 15, 2020, the court granted Stanford Financial Group receiver’s motion to stay the state court action. On February 26, 2020, the lawsuit was removed to federal court in the Southern District of Texas by TNB.  Trustmark and its counsel are carefully evaluating the Smith Complaint in the form that is publicly available, and will update the foregoing description to the extent that additional material facts are ascertained.

TNB’s relationship with the Stanford Financial Group began as a result of Trustmark’s acquisition of a Houston-based bank in August 2006, and consisted of correspondent banking and other traditional banking services in the ordinary course of business.  All Stanford-related lawsuits are in pre-trial stages.

On December 30, 2019, a complaint was filed in the United States District Court for the Southern District of Mississippi, Northern Division (the Court) by Alysson Mills in her capacity as Court-appointed Receiver (the Receiver) for Arthur Lamar Adams (Adams) and Madison Timber Properties, LLC (Madison Timber), naming TNB, two other Mississippi-based financial institutions both of which are unaffiliated with Trustmark and two individuals, one of who was employed by TNB at all times relevant to the complaint and the other was employed either by TNB or one of the other defendant financial institutions, as defendants.  The complaint seeks to

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recover from the defendants, for the benefit of the receivership estate and also for certain investors who were allegedly defrauded by Adams and Madison Timber, damages (including punitive damages) and related costs allegedly attributable to actions of the defendants that allegedly enabled illegal and fraudulent activities engaged in by Adams and Madison Timber.  The Receiver did not quantify damages.

TNB’s relationship with Adams and Madison Timber consisted of traditional banking services in the ordinary course of business.

Trustmark and its subsidiaries are also parties to other lawsuits and other claims that arise in the ordinary course of business.  Some of the lawsuits assert claims related to the lending, collection, servicing, investment, trust and other business activities, and some of the lawsuits allege substantial claims for damages.

All pending legal proceedings described above are being vigorously contested.  In accordance with FASB Accounting Standards Codification (ASC) Topic 450-20, “Loss Contingencies,” Trustmark will establish an accrued liability for litigation matters when those matters present loss contingencies that are both probable and reasonably estimable.  At the present time, Management believes, based on the advice of legal counsel and Management’s evaluation, that a loss in any such proceeding is not probable and reasonably estimable.  All matters will continue to be monitored for further developments that would make such loss contingency both probable and reasonably estimable.  In view of the inherent difficulty of predicting the outcome of legal proceedings, Trustmark cannot predict the eventual outcomes of the currently pending matters or the timing of their ultimate resolution.  Management currently believes, however, based upon the advice of legal counsel and Management’s evaluation and after taking into account its current insurance coverage, that the legal proceedings currently pending should not have a material adverse effect on Trustmark’s consolidated financial condition.

ITEM 1A. RISK FACTORS

The following risk factors are intended as a supplement to the risk factors disclosed in Part I. Item 1A. – Risk Factors included in Trustmark’s Annual Report on Form 10-K for the year ended December 31, 2019.

The novel coronavirus (COVID-19) pandemic and actions taken to mitigate its spread and economic impact, or an outbreak of another highly infectious or contagious disease, could adversely affect Trustmark’s business activities, financial condition and results of operations.

The spread of a highly infectious or contagious disease, such as COVID-19, and actions taken by governmental and public health authorities to mitigate its spread, such as instituting quarantines, travel restrictions and “shelter in place” orders, could lead to severe disruptions in the United States economy, which could in turn disrupt the business, activities and operations of Trustmark’s customers, as well as its business and operations. Moreover, since the beginning of January 2020, the COVID-19 pandemic has caused significant disruption in the financial markets both globally and in the United States.

Trustmark’s business is dependent upon the willingness and ability of its customers to conduct banking and other financial transactions. The spread of COVID-19, or an outbreak of another highly infectious or contagious disease, may result in a significant decrease in business and/or cause Trustmark’s customers to be unable to meet existing payment or other obligations, particularly in the event of a spread of COVID-19 or an outbreak of an infectious disease in Trustmark’s market regions. Although Trustmark maintains contingency plans for pandemic outbreaks, a spread of COVID-19, or an outbreak of another contagious disease, could also negatively impact the availability of key personnel necessary to conduct its business activities. Such a spread or outbreak could also negatively impact the business and operations of third-party service providers who perform critical services for Trustmark. If COVID-19, or another highly infectious or contagious disease, spreads or the response to contain COVID-19 is unsuccessful, Trustmark could experience a material adverse effect to its business, financial condition, and results of operations.

There continue to be broad concerns related to the potential effects of the COVID-19 pandemic. If the COVID-19 pandemic has an adverse effect on (i) customer deposits, (ii) the ability of Trustmark’s borrowers to satisfy their obligations, (iii) the demand for Trustmark’s loans or its other products and services, (iv) other aspects of Trustmark’s business operations, or (v) on financial markets, real estate markets, or economic growth, this could, depending on the extent of the decline in customer deposits or loan defaults, materially and adversely affect Trustmark’s liquidity, financial condition and the results of operations.

Additionally, the COVID-19 pandemic has significantly affected the financial markets and has resulted in a number of actions by the FRB. Market interest rates have declined significantly. On March 3, 2020, the ten-year Treasury yield fell below 1.00% for the first time, and the FRB reduced the target federal funds rate by 50 basis points to a range of 1.00% to 1.25%. On March 15, 2020, the FRB further reduced the target federal funds rate by 100 basis points to a range of 0.00% to 0.25% and announced a $700 billion quantitative easing program in response to the expected economic downturn caused by the COVID-19 pandemic. The FRB reduced the interest that it pays on excess reserves from 1.60% to 1.10% on March 3, 2020, and then to 0.10% on March 15, 2020. Trustmark

91

expects that these reductions in interest rates, especially if prolonged, could adversely affect its net interest income and margins and its profitability.

Management expects Trustmark’s net interest income and noninterest income to decline and credit-related losses to increase for an uncertain period given the decline in economic activity occurring due to the COVID-19 pandemic and the actions by the FRB with respect to interest rates. The spread of COVID-19 and its impact on the economy heightens the risk associated with many of the risk factors described in this report, such as those related to credit losses and Trustmark’s reliance on its executives and third-party service providers, for example.  The extent to which the COVID-19 pandemic will impact Trustmark’s business, results of operations and financial condition, as well as its regulatory capital, liquidity ratios and stock price, will depend on future developments, which are highly uncertain and cannot be predicted, including the scope and duration of the pandemic and actions taken by governmental authorities and other third parties in response to the pandemic.

As a participating lender in the Small Business Administration’s (SBA) Paycheck Protection Program (PPP), Trustmark is subject to additional risks of litigation from its customers or other parties regarding TNB’s processing of loans for the PPP and risks that the SBA may not fund some or all PPP loan guaranties.

On March 27, 2020, President Trump signed the Coronavirus Aid, Relief, and Economic Security Act (CARES Act), which included a $349 billion loan program administered through the SBA referred to as the PPP. Under the PPP, small businesses and other entities and individuals can apply for loans from existing SBA lenders and other approved regulated lenders that enroll in the program, subject to numerous limitations and eligibility criteria. TNB is participating as a lender in the PPP. The PPP opened on April 3, 2020; however, because of the short timeframe between the passing of the CARES Act and the opening of the PPP, there is some ambiguity in the laws, rules and guidance regarding the operation of the PPP, which exposes Trustmark to risks relating to noncompliance with the PPP. On April 16, 2020, the SBA notified lenders that the $349 billion earmarked for the PPP was exhausted. Legislation providing an additional $320 billion in funding for the PPP was signed into law on April 24, 2020.  The SBA began accepting applications for the new funding on April 27, 2020.

Since the opening of the PPP, several financial institutions have been subject to litigation regarding the processes and procedures used in processing applications for the PPP. Trustmark may be exposed to the risk of similar litigation, from both customers and non-customers that approached TNB regarding PPP loans, regarding its processes and procedures used in processing applications for the PPP. If any such litigation is filed against Trustmark and is not resolved in a manner favorable to Trustmark, it may result in significant financial liability or adversely affect Trustmark’s reputation. In addition, litigation can be costly, regardless of outcome. Any financial liability, litigation costs or reputational damage caused by PPP related litigation could have a material adverse impact on Trustmark’s business, financial condition and results of operations.

Trustmark also has credit risk on PPP loans if a determination is made by the SBA that there is a deficiency in the manner in which the loan was originated, funded, or serviced by TNB, such as an issue with the eligibility of a borrower to receive a PPP loan, which may or may not be related to the ambiguity in the laws, rules and guidance regarding the operation of the PPP. In the event of a loss resulting from a default on a PPP loan and a determination by the SBA that there was a deficiency in the manner in which the PPP loan was originated, funded, or serviced by TNB, the SBA may deny its liability under the guaranty, reduce the amount of the guaranty, or, if it has already paid under the guaranty, seek recovery of any loss related to the deficiency from Trustmark.

92

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The Board of Directors of Trustmark authorized a stock repurchase program effective April 1, 2019, under which $100.0 million of Trustmark’s outstanding common shares could be acquired through March 31, 2020.

On January 28, 2020, the Board of Directors of Trustmark authorized a new stock repurchase program, effective April 1, 2020, under which $100.0 million of Trustmark’s outstanding common stock may be acquired through December 31, 2021.  The shares may be purchased from time to time at prevailing market prices, through open market or private transactions, depending on market conditions.  There is no guarantee as to the number of shares that may be repurchased by Trustmark, and Trustmark may discontinue purchases under the program at any time at Management’s discretion.  

On March 9, 2020, Trustmark suspended its share repurchase programs to preserve capital to support customers during the COVID-19 pandemic.  

The following table provides information with respect to purchases by Trustmark or made on behalf of Trustmark of its common stock during the three months ended March 31, 2020 ($ in thousands, except per share amounts):

Period	Total Number of Shares Purchased		Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plan		Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plan at the End of the Period
January 1, 2020 to January 31, 2020		357,062	$	33.51		357,062	$	68,314
February 1, 2020 to February 29, 2020		338,800		30.84		338,800		57,865
March 1, 2020 to March 31, 2020		191,096		26.82		191,096		52,740
Total		886,958				886,958

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

None.

ITEM 6. EXHIBITS

The exhibits listed in the Exhibit Index are filed herewith or are incorporated herein by reference.

93

EXHIBIT INDEX

31-a	Certification by Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31-b	Certification by Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32-a	Certification by Chief Executive Officer pursuant to 18 U.S.C. ss. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32-b	Certification by Principal Financial Officer pursuant to 18 U.S.C. ss. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101	Inline XBRL Interactive Data.
104	Cover Page Interactive Data File (embedded within the Inline XBRL document).

All other exhibits are omitted, as they are inapplicable or not required by the related instructions.

94

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

TRUSTMARK CORPORATION

BY:	/s/ Gerard R. Host	BY:	/s/ Louis E. Greer
	Gerard R. Host		Louis E. Greer
	Chairman of the Board, President and		Treasurer, Principal Financial Officer and
	Chief Executive Officer		Principal Accounting Officer
DATE:	May 8, 2020	DATE:	May 8, 2020

95

EX-31.A

Exhibit 31-a

TRUSTMARK CORPORATION

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Gerard R. Host, certify that:

1) I have reviewed this quarterly report on Form 10-Q of Trustmark Corporation;

2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4) The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5) The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

BY:	/s/ Gerard R. Host
	Gerard R. Host
	Chairman of the Board, President and  Chief Executive Officer
DATE:	May 8, 2020

EX-31.B

Exhibit 31-b

TRUSTMARK CORPORATION

CERTIFICATION OF THE PRINCIPAL FINANCIAL OFFICER

PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Louis E. Greer, certify that:

1) I have reviewed this quarterly report on Form 10-Q of Trustmark Corporation;

2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4) The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5) The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

BY:	/s/ Louis E. Greer
	Louis E. Greer
	Treasurer, Principal Financial Officer and Principal Accounting Officer
DATE:	May 8, 2020

EX-32.A

Exhibit 32-a

TRUSTMARK CORPORATION

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Trustmark Corporation (Trustmark) on Form 10-Q for the quarter ended March 31, 2020, as filed with the Securities and Exchange Commission on the date hereof (the Report), I, Gerard R. Host, President and Chief Executive Officer of Trustmark, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Trustmark.

BY:	/s/ Gerard R. Host
	Gerard R. Host
	Chairman of the Board, President and Chief Executive Officer
DATE:	May 8, 2020

EX-32.B

Exhibit 32-b

TRUSTMARK CORPORATION

CERTIFICATION OF THE PRINCIPAL FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Trustmark Corporation (Trustmark) on Form 10-Q for the quarter ended March 31, 2020, as filed with the Securities and Exchange Commission on the date hereof (the Report), I, Louis E. Greer, Treasurer, Principal Financial Officer and Principal Accounting Officer of Trustmark, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Trustmark.

BY:	/s/ Louis E. Greer
	Louis E. Greer
	Treasurer, Principal Financial Officer and Principal Accounting Officer
DATE:	May 8, 2020

XML

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of Amortized Cost Basis of Loans by Credit Quality Indicator (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	$ 590,609
Term Loans by Origination Year, 2019	2,262,786
Term Loans by Origination Year, 2018	1,660,237
Term Loans by Origination Year, 2017	1,039,291
Term Loans by Origination Year, 2016	982,810
Term Loans by Origination Year, Prior to 2016	1,564,386
Financing Receivable, Revolving Loans	1,467,801
Financing Receivable, before Allowance for Credit Loss	9,567,920
Commercial LHFI [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	513,950
Term Loans by Origination Year, 2019	1,884,719
Term Loans by Origination Year, 2018	1,344,993
Term Loans by Origination Year, 2017	891,174
Term Loans by Origination Year, 2016	833,904
Term Loans by Origination Year, Prior to 2016	1,095,472
Financing Receivable, Revolving Loans	1,028,150
Financing Receivable, before Allowance for Credit Loss	7,592,362	$ 7,348,158
Commercial LHFI [Member] | Pass - RR 1 through RR 6 [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, before Allowance for Credit Loss		7,178,617
Commercial LHFI [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, before Allowance for Credit Loss		9,049
Commercial LHFI [Member] | Substandard - RR [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, before Allowance for Credit Loss		159,163
Commercial LHFI [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, before Allowance for Credit Loss		1,329
Commercial LHFI [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	183,597
Term Loans by Origination Year, 2019	297,177
Term Loans by Origination Year, 2018	165,989
Term Loans by Origination Year, 2017	116,222
Term Loans by Origination Year, 2016	86,985
Term Loans by Origination Year, Prior to 2016	62,569
Financing Receivable, Revolving Loans	564,238
Financing Receivable, before Allowance for Credit Loss	1,476,777	1,477,896
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, 2020	175,477
Term Loans by Origination Year, 2019	294,301
Term Loans by Origination Year, 2018	146,947
Term Loans by Origination Year, 2017	115,358
Term Loans by Origination Year, 2016	85,992
Term Loans by Origination Year, Prior to 2016	59,924
Financing Receivable, Revolving Loans	540,814
Financing Receivable, before Allowance for Credit Loss	1,418,813	1,407,837
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, before Allowance for Credit Loss		909
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Substandard - RR [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	8,103
Term Loans by Origination Year, 2019	2,336
Term Loans by Origination Year, 2018	19,042
Term Loans by Origination Year, 2017	864
Term Loans by Origination Year, 2016	724
Term Loans by Origination Year, Prior to 2016	2,641
Financing Receivable, Revolving Loans	23,416
Financing Receivable, before Allowance for Credit Loss	57,126	68,262
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	17
Term Loans by Origination Year, 2019	540
Term Loans by Origination Year, 2016	269
Term Loans by Origination Year, Prior to 2016	4
Financing Receivable, Revolving Loans	8
Financing Receivable, before Allowance for Credit Loss	838	888
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	30,645
Term Loans by Origination Year, 2019	134,410
Term Loans by Origination Year, 2018	76,100
Term Loans by Origination Year, 2017	124,472
Term Loans by Origination Year, 2016	147,560
Term Loans by Origination Year, Prior to 2016	424,645
Financing Receivable, Revolving Loans	805
Financing Receivable, before Allowance for Credit Loss	938,637	967,944
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, 2020	30,645
Term Loans by Origination Year, 2019	134,410
Term Loans by Origination Year, 2018	76,100
Term Loans by Origination Year, 2017	124,088
Term Loans by Origination Year, 2016	147,560
Term Loans by Origination Year, Prior to 2016	415,156
Financing Receivable, Revolving Loans	805
Financing Receivable, before Allowance for Credit Loss	928,764	957,948
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, Prior to 2016	4,650
Financing Receivable, before Allowance for Credit Loss	4,650	4,650
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member] | Substandard - RR [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2017	384
Term Loans by Origination Year, Prior to 2016	4,839
Financing Receivable, before Allowance for Credit Loss	5,223	5,346
Commercial LHFI [Member] | Other Commercial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	37,485
Term Loans by Origination Year, 2019	92,852
Term Loans by Origination Year, 2018	36,513
Term Loans by Origination Year, 2017	15,836
Term Loans by Origination Year, 2016	60,081
Term Loans by Origination Year, Prior to 2016	55,370
Financing Receivable, Revolving Loans	278,242
Financing Receivable, before Allowance for Credit Loss	576,379
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, 2020	37,485
Term Loans by Origination Year, 2019	90,436
Term Loans by Origination Year, 2018	35,815
Term Loans by Origination Year, 2017	15,742
Term Loans by Origination Year, 2016	58,816
Term Loans by Origination Year, Prior to 2016	55,347
Financing Receivable, Revolving Loans	267,500
Financing Receivable, before Allowance for Credit Loss	561,141
Commercial LHFI [Member] | Other Commercial Loans [Member] | Special Mention - RR 7 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2019	2,028
Financing Receivable, Revolving Loans	2,995
Financing Receivable, before Allowance for Credit Loss	5,023
Commercial LHFI [Member] | Other Commercial Loans [Member] | Substandard - RR [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2019	299
Term Loans by Origination Year, 2018	698
Term Loans by Origination Year, 2017	94
Term Loans by Origination Year, 2016	1,265
Financing Receivable, Revolving Loans	7,747
Financing Receivable, before Allowance for Credit Loss	10,103
Commercial LHFI [Member] | Other Commercial Loans [Member] | Doubtful - RR 9 [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2019	89
Term Loans by Origination Year, Prior to 2016	23
Financing Receivable, before Allowance for Credit Loss	112
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, 2020	78,618
Term Loans by Origination Year, 2019	224,530
Term Loans by Origination Year, 2018	54,655
Term Loans by Origination Year, 2017	7,358
Term Loans by Origination Year, 2016	4,908
Term Loans by Origination Year, Prior to 2016	6,858
Financing Receivable, Revolving Loans	36,843
Financing Receivable, before Allowance for Credit Loss	413,770
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, 2020	77,319
Term Loans by Origination Year, 2019	223,340
Term Loans by Origination Year, 2018	54,232
Term Loans by Origination Year, 2017	7,319
Term Loans by Origination Year, 2016	4,228
Term Loans by Origination Year, Prior to 2016	6,771
Financing Receivable, Revolving Loans	36,843
Financing Receivable, before Allowance for Credit Loss	410,052
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Substandard - RR [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	1,299
Term Loans by Origination Year, 2019	1,190
Term Loans by Origination Year, 2018	423
Term Loans by Origination Year, 2017	39
Term Loans by Origination Year, 2016	680
Term Loans by Origination Year, Prior to 2016	45
Financing Receivable, before Allowance for Credit Loss	3,676
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, Prior to 2016	42
Financing Receivable, before Allowance for Credit Loss	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, 2020	8,030
Term Loans by Origination Year, 2019	36,952
Term Loans by Origination Year, 2018	26,311
Term Loans by Origination Year, 2017	13,989
Term Loans by Origination Year, 2016	14,990
Term Loans by Origination Year, Prior to 2016	11,488
Financing Receivable, Revolving Loans	11,626
Financing Receivable, before Allowance for Credit Loss	123,386
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, 2020	7,746
Term Loans by Origination Year, 2019	32,807
Term Loans by Origination Year, 2018	25,192
Term Loans by Origination Year, 2017	13,745
Term Loans by Origination Year, 2016	14,504
Term Loans by Origination Year, Prior to 2016	10,639
Financing Receivable, Revolving Loans	11,512
Financing Receivable, before Allowance for Credit Loss	116,145
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, 2019	92
Financing Receivable, before Allowance for Credit Loss	92
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Substandard - RR [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	284
Term Loans by Origination Year, 2019	4,016
Term Loans by Origination Year, 2018	1,119
Term Loans by Origination Year, 2017	244
Term Loans by Origination Year, 2016	486
Term Loans by Origination Year, Prior to 2016	849
Financing Receivable, Revolving Loans	114
Financing Receivable, before Allowance for Credit Loss	7,112
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, 2019	37
Financing Receivable, before Allowance for Credit Loss	37
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, 2020	18,032
Term Loans by Origination Year, 2019	180,838
Term Loans by Origination Year, 2018	270,470
Term Loans by Origination Year, 2017	177,386
Term Loans by Origination Year, 2016	137,018
Term Loans by Origination Year, Prior to 2016	41,584
Financing Receivable, Revolving Loans	12,561
Financing Receivable, before Allowance for Credit Loss	837,889
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, 2020	18,032
Term Loans by Origination Year, 2019	180,641
Term Loans by Origination Year, 2018	269,166
Term Loans by Origination Year, 2017	177,386
Term Loans by Origination Year, 2016	136,620
Term Loans by Origination Year, Prior to 2016	40,741
Financing Receivable, Revolving Loans	12,561
Financing Receivable, before Allowance for Credit Loss	835,147
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Substandard - RR [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2019	197
Term Loans by Origination Year, 2018	1,304
Term Loans by Origination Year, 2016	398
Term Loans by Origination Year, Prior to 2016	843
Financing Receivable, before Allowance for Credit Loss	2,742
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, 2020	137,174
Term Loans by Origination Year, 2019	558,243
Term Loans by Origination Year, 2018	496,915
Term Loans by Origination Year, 2017	411,712
Term Loans by Origination Year, 2016	359,208
Term Loans by Origination Year, Prior to 2016	492,958
Financing Receivable, Revolving Loans	119,190
Financing Receivable, before Allowance for Credit Loss	2,575,400	2,475,090
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, 2020	132,966
Term Loans by Origination Year, 2019	542,615
Term Loans by Origination Year, 2018	495,056
Term Loans by Origination Year, 2017	407,125
Term Loans by Origination Year, 2016	350,006
Term Loans by Origination Year, Prior to 2016	474,906
Financing Receivable, Revolving Loans	118,137
Financing Receivable, before Allowance for Credit Loss	2,520,811	2,430,761
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, 2019	740
Term Loans by Origination Year, Prior to 2016	4,826
Financing Receivable, before Allowance for Credit Loss	5,566
Commercial LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Substandard - RR [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	4,148
Term Loans by Origination Year, 2019	14,888
Term Loans by Origination Year, 2018	1,859
Term Loans by Origination Year, 2017	4,587
Term Loans by Origination Year, 2016	9,202
Term Loans by Origination Year, Prior to 2016	12,885
Financing Receivable, Revolving Loans	1,053
Financing Receivable, before Allowance for Credit Loss	48,622	44,001
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, 2020	60
Term Loans by Origination Year, Prior to 2016	341
Financing Receivable, before Allowance for Credit Loss	401	328
Commercial LHFI [Member] | Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	20,369
Term Loans by Origination Year, 2019	359,717
Term Loans by Origination Year, 2018	218,040
Term Loans by Origination Year, 2017	24,199
Term Loans by Origination Year, 2016	23,154
Financing Receivable, Revolving Loans	4,645
Financing Receivable, before Allowance for Credit Loss	650,124
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, 2020	20,369
Term Loans by Origination Year, 2019	359,717
Term Loans by Origination Year, 2018	203,819
Term Loans by Origination Year, 2017	24,199
Term Loans by Origination Year, 2016	23,154
Financing Receivable, Revolving Loans	4,645
Financing Receivable, before Allowance for Credit Loss	635,903
Commercial LHFI [Member] | Other Loans Secured by Real Estate [Member] | Other Construction [Member] | Substandard - RR [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2018	14,221
Financing Receivable, before Allowance for Credit Loss	14,221
Consumer LHFI [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	76,659
Term Loans by Origination Year, 2019	378,067
Term Loans by Origination Year, 2018	315,244
Term Loans by Origination Year, 2017	148,117
Term Loans by Origination Year, 2016	148,906
Term Loans by Origination Year, Prior to 2016	468,914
Financing Receivable, Revolving Loans	439,651
Financing Receivable, before Allowance for Credit Loss	1,975,558	9,335,628
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, before Allowance for Credit Loss		1,477,896
Consumer LHFI [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Financing Receivable, before Allowance for Credit Loss		967,944
Consumer LHFI [Member] | Consumer Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	24,236
Term Loans by Origination Year, 2019	54,251
Term Loans by Origination Year, 2018	26,227
Term Loans by Origination Year, 2017	10,264
Term Loans by Origination Year, 2016	2,786
Term Loans by Origination Year, Prior to 2016	1,407
Financing Receivable, Revolving Loans	54,507
Financing Receivable, before Allowance for Credit Loss	173,678	175,738
Consumer LHFI [Member] | Consumer Loans [Member] | Current [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	23,790
Term Loans by Origination Year, 2019	53,753
Term Loans by Origination Year, 2018	25,875
Term Loans by Origination Year, 2017	10,148
Term Loans by Origination Year, 2016	2,751
Term Loans by Origination Year, Prior to 2016	1,390
Financing Receivable, Revolving Loans	53,694
Financing Receivable, before Allowance for Credit Loss	171,401
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	425
Term Loans by Origination Year, 2019	469
Term Loans by Origination Year, 2018	313
Term Loans by Origination Year, 2017	89
Term Loans by Origination Year, 2016	31
Term Loans by Origination Year, Prior to 2016	9
Financing Receivable, Revolving Loans	561
Financing Receivable, before Allowance for Credit Loss	1,897
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2020	21
Term Loans by Origination Year, 2019	12
Term Loans by Origination Year, 2018	11
Financing Receivable, Revolving Loans	252
Financing Receivable, before Allowance for Credit Loss	296
Consumer LHFI [Member] | Consumer Loans [Member] | Nonaccrual [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2019	17
Term Loans by Origination Year, 2018	28
Term Loans by Origination Year, 2017	27
Term Loans by Origination Year, 2016	4
Term Loans by Origination Year, Prior to 2016	8
Financing Receivable, before Allowance for Credit Loss	84
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, 2020	4,470
Term Loans by Origination Year, 2019	44,148
Term Loans by Origination Year, 2018	14,563
Term Loans by Origination Year, 2017	2,583
Term Loans by Origination Year, 2016	2,021
Term Loans by Origination Year, Prior to 2016	4,710
Financing Receivable, before Allowance for Credit Loss	72,495
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, 2020	4,470
Term Loans by Origination Year, 2019	44,148
Term Loans by Origination Year, 2018	14,499
Term Loans by Origination Year, 2017	2,531
Term Loans by Origination Year, 2016	1,992
Term Loans by Origination Year, Prior to 2016	4,557
Financing Receivable, before Allowance for Credit Loss	72,197
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, 2018	64
Term Loans by Origination Year, 2017	52
Term Loans by Origination Year, 2016	29
Term Loans by Origination Year, Prior to 2016	43
Financing Receivable, before Allowance for Credit Loss	188
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, Prior to 2016	110
Financing Receivable, before Allowance for Credit Loss	110
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, 2020	5,719
Term Loans by Origination Year, 2019	24,767
Term Loans by Origination Year, 2018	17,405
Term Loans by Origination Year, 2017	5,703
Term Loans by Origination Year, 2016	2,891
Term Loans by Origination Year, Prior to 2016	19,966
Financing Receivable, Revolving Loans	385,144
Financing Receivable, before Allowance for Credit Loss	461,595
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, 2020	5,636
Term Loans by Origination Year, 2019	24,558
Term Loans by Origination Year, 2018	17,083
Term Loans by Origination Year, 2017	5,225
Term Loans by Origination Year, 2016	2,833
Term Loans by Origination Year, Prior to 2016	17,902
Financing Receivable, Revolving Loans	380,934
Financing Receivable, before Allowance for Credit Loss	454,171
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, 2019	166
Term Loans by Origination Year, 2018	111
Term Loans by Origination Year, 2017	30
Term Loans by Origination Year, 2016	58
Term Loans by Origination Year, Prior to 2016	1,384
Financing Receivable, Revolving Loans	1,870
Financing Receivable, before Allowance for Credit Loss	3,619
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, 2019	5
Term Loans by Origination Year, Prior to 2016	2
Financing Receivable, Revolving Loans	34
Financing Receivable, before Allowance for Credit Loss	41
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, 2020	83
Term Loans by Origination Year, 2019	38
Term Loans by Origination Year, 2018	211
Term Loans by Origination Year, 2017	448
Term Loans by Origination Year, Prior to 2016	678
Financing Receivable, Revolving Loans	2,306
Financing Receivable, before Allowance for Credit Loss	3,764
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, 2020	60
Term Loans by Origination Year, 2018	47
Term Loans by Origination Year, 2017	47
Term Loans by Origination Year, 2016	111
Term Loans by Origination Year, Prior to 2016	419
Financing Receivable, before Allowance for Credit Loss	684
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, 2020	60
Term Loans by Origination Year, 2018	47
Term Loans by Origination Year, 2017	47
Term Loans by Origination Year, 2016	111
Term Loans by Origination Year, Prior to 2016	419
Financing Receivable, before Allowance for Credit Loss	684
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, 2017	6
Term Loans by Origination Year, Prior to 2016	16
Financing Receivable, before Allowance for Credit Loss	22	$ 2,475,245
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, Prior to 2016	16
Financing Receivable, before Allowance for Credit Loss	16
Consumer LHFI [Member] | Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Past Due 30-89 Days [Member]
Financing Receivable Recorded Investment [Line Items]
Term Loans by Origination Year, 2017	6
Financing Receivable, before Allowance for Credit Loss	6
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, 2020	42,174
Term Loans by Origination Year, 2019	254,901
Term Loans by Origination Year, 2018	257,002
Term Loans by Origination Year, 2017	129,514
Term Loans by Origination Year, 2016	141,097
Term Loans by Origination Year, Prior to 2016	442,396
Financing Receivable, before Allowance for Credit Loss	1,267,084
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, 2020	42,174
Term Loans by Origination Year, 2019	253,904
Term Loans by Origination Year, 2018	251,953
Term Loans by Origination Year, 2017	128,603
Term Loans by Origination Year, 2016	140,848
Term Loans by Origination Year, Prior to 2016	431,984
Financing Receivable, before Allowance for Credit Loss	1,249,466
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, 2019	271
Term Loans by Origination Year, 2018	2,649
Term Loans by Origination Year, 2017	123
Term Loans by Origination Year, Prior to 2016	1,803
Financing Receivable, before Allowance for Credit Loss	4,846
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, 2019	96
Term Loans by Origination Year, 2018	148
Term Loans by Origination Year, Prior to 2016	61
Financing Receivable, before Allowance for Credit Loss	305
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, 2019	630
Term Loans by Origination Year, 2018	2,252
Term Loans by Origination Year, 2017	788
Term Loans by Origination Year, 2016	249
Term Loans by Origination Year, Prior to 2016	8,548
Financing Receivable, before Allowance for Credit Loss	$ 12,467

XML

Defined Benefit and Other Postretirement Benefits - Net Periodic Benefit Cost (Details) - Supplemental Retirement Plan [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net periodic benefit cost [Abstract]
Service cost	$ 19	$ 27
Interest cost	414	541
Amortization of prior service cost	37	63
Recognized net actuarial loss	246	162
Net periodic benefit cost	$ 716	$ 793

XML

Revenue from Contracts with Customers - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue From Contract With Customer [Abstract]
Other real estate sales, net gain (loss)	$ (70)	$ 122

XML

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Troubled Debt Restructuring Subsequently Defaulted (Details) - Troubled Debt Restructurings [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) Contract	Mar. 31, 2019 USD ($) Contract
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	6	12
Recorded Investment | $	$ 640	$ 15,912
Construction, Land Development and Other Land [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	0	1
Recorded Investment | $	$ 0	$ 22
Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	3	3
Recorded Investment | $	$ 446	$ 684
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	3	6
Recorded Investment | $	$ 194	$ 15,178
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	0	2
Recorded Investment | $	$ 0	$ 28

XML

Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Loss Contingencies [Line Items]
Unused commitments to extend credit	$ 4,219.0	$ 4,011.0
Standby Letters of Credit [Member]
Loss Contingencies [Line Items]
Potential exposure to credit loss in the event of nonperformance	$ 106.9	106.5
Letters of credit, maturity term - maximum	3 years
Collateral held, fair value	$ 25.8	$ 30.0

XML

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Change in Allowance for Loan Losses (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	[1]	$ 84,277
FASB ASU 2016-13 Adoption Adjustment		19,949
PCL	[1]	20,581	$ 1,611
Balance at end of period	[1]	100,564
Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		84,277	79,290
FASB ASU 2016-13 Adoption Adjustment		(1,217)
Loans charged-off		(5,545)	(4,033)
Recoveries		2,468	2,137
Net (charge-offs) recoveries		(3,077)	(1,896)
PCL		20,581	1,611
Balance at end of period		100,564	79,005
Allowance for Credit Losses, ACL [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		25,992
FASB ASU 2016-13 Adoption Adjustment		(8,964)
Loans charged-off		(982)
Recoveries		542
PCL		(2,024)
Balance at end of period		14,564
Allowance for Credit Losses, ACL [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		3,379
FASB ASU 2016-13 Adoption Adjustment		2,059
Loans charged-off		(690)
Recoveries		473
PCL		1,375
Balance at end of period		6,596
Allowance for Credit Losses, ACL [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		2,229
FASB ASU 2016-13 Adoption Adjustment		2,455
PCL		(1,243)
Balance at end of period		3,441
Allowance for Credit Losses, ACL [Member] | Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		5,303
FASB ASU 2016-13 Adoption Adjustment		2,084
Loans charged-off		(1,334)
Recoveries		1,117
PCL		(1,150)
Balance at end of period		6,020
Allowance for Credit Losses, ACL [Member] | Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		5,303
Allowance for Credit Losses, ACL [Member] | 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		8,260
Balance at end of period		9,079
Allowance for Credit Losses, ACL [Member] | Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Commercial LHFI [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		6,371
FASB ASU 2016-13 Adoption Adjustment		(188)
Recoveries		94
PCL		2,802
Balance at end of period		9,079
Allowance for Credit Losses, ACL [Member] | 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		5,888
FASB ASU 2016-13 Adoption Adjustment		4,188
Loans charged-off		(64)
Recoveries		63
PCL		1,636
Balance at end of period		11,711
Allowance for Credit Losses, ACL [Member] | 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		8,932
Allowance for Credit Losses, ACL [Member] | 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		26,158
FASB ASU 2016-13 Adoption Adjustment		(8,179)
Loans charged-off		(2,448)
Recoveries		61
PCL		12,535
Balance at end of period		28,127
Allowance for Credit Losses, ACL [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		4,024
FASB ASU 2016-13 Adoption Adjustment		(765)
Loans charged-off		(8)
Recoveries		6
PCL		2,016
Balance at end of period		5,273
Allowance for Credit Losses, ACL [Member] | 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		3,044
FASB ASU 2016-13 Adoption Adjustment		2,891
Loans charged-off		(19)
Recoveries		93
PCL		2,033
Balance at end of period		8,042
Allowance for Credit Losses, ACL [Member] | Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		1,889
FASB ASU 2016-13 Adoption Adjustment		3,202
Recoveries		19
PCL		2,601
Balance at end of period		7,711
Allowance for Credit Losses, ACL [Member] | ASU 2016-13 [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
LHFI		(3,039)
Allowance for loan losses, acquired loans transfer		815
Acquired loans ACL adjustment		1,007
Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		9,335,628	79,290
Loans charged-off			(4,033)
Recoveries			2,137
PCL			1,611
Balance at end of period		9,567,920	79,005
Allowance for Loan Losses, LHFI [Member] | Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		1,477,896	27,359
Loans charged-off			(1,859)
Recoveries			137
PCL			3,565
Balance at end of period		1,476,777	29,202
Allowance for Loan Losses, LHFI [Member] | Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		175,738	2,890
Loans charged-off			(793)
Recoveries			534
PCL			517
Balance at end of period		173,678	3,148
Allowance for Loan Losses, LHFI [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		967,944	990
PCL			(198)
Balance at end of period		938,637	792
Allowance for Loan Losses, LHFI [Member] | Other Commercial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at end of period		576,379
Allowance for Loan Losses, LHFI [Member] | Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		495,621	6,194
Loans charged-off			(1,185)
Recoveries			919
PCL			(526)
Balance at end of period			5,402
Allowance for Loan Losses, LHFI [Member] | 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		1,162,791	7,390
Loans charged-off			(35)
Recoveries			306
PCL			(137)
Balance at end of period		486,265	7,524
Allowance for Loan Losses, LHFI [Member] | 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 end of period		584,981
Allowance for Loan Losses, LHFI [Member] | 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		1,855,913	8,641
Loans charged-off			(161)
Recoveries			216
PCL			(315)
Balance at end of period			8,381
Allowance for Loan Losses, LHFI [Member] | 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		2,475,245	22,376
Recoveries			15
PCL			(912)
Balance at end of period		2,575,422	21,479
Allowance for Loan Losses, LHFI [Member] | Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period		724,480	3,450
Recoveries			10
PCL			(383)
Balance at end of period		838,573	$ 3,077
Allowance for Loan Losses, LHFI [Member] | 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 end of period		1,267,084
Allowance for Loan Losses, LHFI [Member] | Other Loans Secured by Real Estate [Member] | Other Construction [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at end of period		$ 650,124

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

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Statements of Cash Flows (Tables)

3 Months Ended

Mar. 31, 2020

Supplemental Cash Flow Information [Abstract]

Cash Flows Supplementary Disclosures

The following table reflects specific transaction amounts for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020		2019
Interest expense paid on deposits and borrowings	$	16,807	$	20,501
Noncash transfers from loans to other real estate		336		785
Securities purchased not settled		—		1,095
Finance right-of-use assets resulting from lease liabilities		—		11,230
Operating right-of-use assets resulting from lease liabilities		671		33,861

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2020

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 March 31,
	2020			2019
General Banking
Net interest income	$	102,403		$	103,005
Provision for credit losses		18,374			1,693
Noninterest income		45,176			22,913
Noninterest expense		106,450			90,015
Income before income taxes		22,755			34,210
Income taxes		2,091			4,155
General banking net income	$	20,664		$	30,055
Selected Financial Information
Total assets	$	13,663,877		$	13,077,106
Depreciation and amortization	$	8,794		$	9,139
Wealth Management
Net interest income	$	1,504		$	1,748
Provision for credit losses		2,207			(4	)
Noninterest income		8,516			7,703
Noninterest expense		8,516			7,663
Income before income taxes		(703	)		1,792
Income taxes		(176	)		444
Wealth management net income	$	(527	)	$	1,348
Selected Financial Information
Total assets	$	280,181		$	329,319
Depreciation and amortization	$	67		$	69
Insurance
Net interest income	$	45		$	55
Noninterest income		11,572			10,875
Noninterest expense		8,844			8,343
Income before income taxes		2,773			2,587
Income taxes		692			651
Insurance net income	$	2,081		$	1,936
Selected Financial Information
Total assets	$	75,771		$	71,592
Depreciation and amortization	$	135		$	129
Consolidated
Net interest income	$	103,952		$	104,808
Provision for credit losses		20,581			1,689
Noninterest income		65,264			41,491
Noninterest expense		123,810			106,021
Income before income taxes		24,825			38,589
Income taxes		2,607			5,250
Consolidated net income	$	22,218		$	33,339
Selected Financial Information
Total assets	$	14,019,829		$	13,478,017
Depreciation and amortization	$	8,996		$	9,337

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Derivative Financial Instruments

3 Months Ended

Mar. 31, 2020

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Note 18 – Derivative Financial Instruments

Derivatives Designated as Hedging Instruments

On April 4, 2013, Trustmark entered into a forward interest rate swap contract on junior subordinated debentures with a total notional amount of $60.0 million.  The interest rate swap contract was designated as a derivative instrument in a cash flow hedge under FASB ASC Topic 815, “Derivatives and Hedging,” with the objective of protecting the quarterly interest payments on Trustmark’s $60.0 million of junior subordinated debentures issued to Trustmark Preferred Capital Trust I throughout the five-year period which began December 31, 2014 and ended December 31, 2019 from the risk of variability of those payments resulting from changes in the three-month LIBOR interest rate.  Under the swap, which became effective on December 31, 2014, Trustmark paid a fixed interest rate of 1.66% and received a variable interest rate based on three-month LIBOR on a total notional amount of $60.0 million, with quarterly net settlements.

The interest rate swap matured on December 31, 2019; therefore, there was no accumulated net after-tax amount related to the effective cash flow hedge included in accumulated other comprehensive income (loss) at December 31, 2019.  No ineffectiveness related to the interest rate swap designated as a cash flow hedge was recognized in the consolidated statements of income for the three months ended March 31, 2019.  Amounts reported in accumulated other comprehensive income (loss) related to this derivative were reclassified to other interest expense as interest payments were made on Trustmark’s variable rate junior subordinated debentures.

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 $516.5 million at March 31, 2020 compared to $564.0 million at December 31, 2019.  Changes in the fair value of these exchange-traded derivative instruments are recorded as noninterest income in mortgage banking, net and are offset by changes in the fair value of the MSR.  The impact of this strategy resulted in a net positive ineffectiveness of $9.9 million and a net negative ineffectiveness of $4.7 million for the three months ended March 31, 2020 and 2019, 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 $454.5 million at March 31, 2020, with a negative valuation adjustment of $9.3 million, compared to $209.0 million, with a negative valuation adjustment of $486 thousand, at December 31, 2019.

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 $382.2 million at March 31, 2020, with a positive valuation adjustment of $9.8 million, compared to $92.1 million, with a positive valuation adjustment of $1.4 million, as of December 31, 2019.

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 nonperformance risk, the changes in fair value are expected to substantially offset.  As of March 31, 2020, Trustmark had interest rate swaps with an aggregate notional amount of $905.6 million related to this program, compared to $893.1 million as of December 31, 2019.

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.

As of March 31, 2020 and December 31, 2019, the termination value of interest rate swaps in a liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $2.8 million and $1.0 million, respectively.  As of March 31, 2020, Trustmark had posted collateral of $2.8 million against its obligations because of negotiated thresholds and minimum transfer amounts under these agreements.  If Trustmark had breached any of these triggering provisions at March 31, 2020, 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 both March 31, 2020 and December 31, 2019, Trustmark had entered into three risk participation agreements as a beneficiary with an aggregate notional amount of $37.2 million and $37.6 million, respectively.  Trustmark had entered into nine risk participation agreements as a guarantor with an aggregate notional amount of $74.9 million at March 31, 2020 compared to ten risk participation agreements as a guarantor with an aggregate notional amount of $79.3 million at December 31, 2019.  The aggregate fair values of these risk participation agreements were immaterial at March 31, 2020 and December 31, 2019.

Tabular Disclosures

The following tables disclose the fair value of derivative instruments in Trustmark’s consolidated balance sheets as of March 31, 2020 and December 31, 2019 as well as the effect of these derivative instruments on Trustmark’s results of operations for the periods presented ($ in thousands):

	March 31, 2020		December 31, 2019
Derivatives not designated as hedging instruments
Interest rate contracts:
Futures contracts included in other assets	$	13,637	$	—
Exchange traded purchased options included in other assets		7,938		244
OTC written options (rate locks) included in other assets		9,826		1,439
Interest rate swaps included in other assets		41,154		16,209
Credit risk participation agreements included in other assets		109		64
Futures contracts included in other liabilities		—		2,654
Forward contracts included in other liabilities		9,318		486
Exchange traded written options included in other liabilities		221		1,760
Interest rate swaps included in other liabilities		2,960		1,122
Credit risk participation agreements included in other liabilities		125		41

	Three Months Ended March 31,
	2020			2019
Derivatives in hedging relationships
Amount of gain (loss) reclassified from accumulated other    comprehensive income (loss) and recognized in other interest expense	$	—		$	171
Derivatives not designated as hedging instruments
Amount of gain (loss) recognized in mortgage banking, net	$	33,486		$	4,853
Amount of gain (loss) recognized in bank card and other fees		(1,660	)		(256	)

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 March 31,
	2020		2019
Derivatives in cash flow hedging relationship
Amount of gain (loss) recognized in other comprehensive    income (loss), net of tax	$	—	$	(47	)

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 March 31, 2020 and December 31, 2019 is presented in the following tables ($ in thousands):

Offsetting of Derivative Assets
As of March 31, 2020
							Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets presented in the Statement of Financial Position		Financial Instruments			Cash Collateral Received		Net Amount
Derivatives	$	41,154	$	—	$	41,154	$	(1	)	$	—	$	41,153

Offsetting of Derivative Liabilities
As of March 31, 2020
							Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities presented in the Statement of Financial Position		Financial Instruments			Cash Collateral Posted			Net Amount
Derivatives	$	2,960	$	—	$	2,960	$	(1	)	$	(2,820	)	$	139

Offsetting of Derivative Assets
As of December 31, 2019
							Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets presented in the Statement of Financial Position		Financial Instruments		Cash Collateral Received		Net Amount
Derivatives	$	16,209	$	—	$	16,209	$	—	$	—	$	16,209

Offsetting of Derivative Liabilities
As of December 31, 2019
							Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities presented in the Statement of Financial Position		Financial Instruments		Cash Collateral Posted			Net Amount
Derivatives	$	1,122	$	—	$	1,122	$	—	$	(1,390	)	$	(268	)

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Earnings Per Share (EPS)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Earnings Per Share (EPS)

Note 14 – 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 March 31,
	2020		2019
Basic shares		63,757		65,239
Dilutive shares		157		140
Diluted shares		63,914		65,379

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 March 31,
	2020		2019
Weighted-average antidilutive stock awards		52		55

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Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	$ 41,154	$ 16,209
Fair value of derivative liability	2,960	1,122
Derivatives not Designated as Hedging Instruments [Member] | Future Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	13,637
Derivatives not Designated as Hedging Instruments [Member] | Future Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability		2,654
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	109	64
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	125	41
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	9,318	486
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	7,938	244
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	9,826	1,439
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset	41,154	16,209
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative liability	2,960	1,122
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	$ 221	$ 1,760

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Segment Information - Additional Information (Details)	3 Months Ended
	Mar. 31, 2020 Segment
Segment Reporting [Abstract]
Number of segments in which the business operates	3

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Mortgage Banking (Tables)

3 Months Ended

Mar. 31, 2020

Mortgage Banking [Abstract]

Schedule of Activity in the Mortgage Servicing Rights

The activity in the mortgage servicing rights (MSR) is detailed in the table below for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	79,394		$	95,596
Origination of servicing assets		3,649			2,507
Change in fair value:
Due to market changes		(23,999	)		(8,863	)
Due to run-off		(2,607	)		(2,398	)
Balance at end of period	$	56,437		$	86,842

Schedule of Mortgage Loans Sold and Serviced for Others

The table below details the mortgage loans sold and serviced for others at March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020		December 31, 2019
Federal National Mortgage Association	$	4,383,261	$	4,411,914
Government National Mortgage Association		2,685,304		2,652,782
Federal Home Loan Mortgage Corporation		69,389		73,134
Other		18,750		19,404
Total mortgage loans sold and serviced for others	$	7,156,704	$	7,157,234

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Securities Sold Under Repurchase Agreements (Tables)

3 Months Ended

Mar. 31, 2020

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 March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020		December 31, 2019
Mortgage-backed securities
Other residential mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or GNMA	$	18,461	$	24,282
Commercial mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or GNMA		29,679		29,290
Total securities sold under repurchase agreements	$	48,140	$	53,572

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Shareholders' Equity - Changes in Balances of Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 1,660,702	$ 1,591,453
Other comprehensive income (loss), before reclassifications, net of tax amount	31,026	14,631
Amounts reclassified from accumulated other comprehensive income (loss)	272	133
Other comprehensive income (loss), net of tax amount	31,298	14,764
Balance	1,652,399	1,587,028
Securities Available for Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(8,017)	(43,824)
Other comprehensive income (loss), before reclassifications, net of tax amount	31,026	14,678
Other comprehensive income (loss), net of tax amount	31,026	14,678
Balance	23,009	(29,146)
Defined Benefit Pension Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(15,583)	(12,324)
Amounts reclassified from accumulated other comprehensive income (loss)	272	261
Other comprehensive income (loss), net of tax amount	272	261
Balance	(15,311)	(12,063)
Cash Flow Hedge Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		469
Other comprehensive income (loss), before reclassifications, net of tax amount		(47)
Amounts reclassified from accumulated other comprehensive income (loss)		(128)
Other comprehensive income (loss), net of tax amount		(175)
Balance		294
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(23,600)	(55,679)
Balance	$ 7,698	$ (40,915)

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Other Real Estate

3 Months Ended

Mar. 31, 2020

Other Real Estate And Foreclosed Assets [Abstract]

Other Real Estate

Note 6 – Other Real Estate

At March 31, 2020, Trustmark’s geographic other real estate distribution was concentrated primarily in its five key market regions: Alabama, Florida, Mississippi, Tennessee and Texas.  The ultimate recovery of a substantial portion of the carrying amount of other real estate is susceptible to changes in market conditions in these areas.

For the periods presented, changes and gains (losses), net on other real estate were as follows ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	29,248		$	34,668
Additions		336			785
Disposals		(3,741	)		(1,658	)
Write-downs		(996	)		(1,656	)
Balance at end of period	$	24,847		$	32,139
Gains (losses), net on the sale of other real estate included in    other real estate expense	$	(70	)	$	122

At March 31, 2020 and December 31, 2019, other real estate by type of property consisted of the following ($ in thousands):

	March 31, 2020		December 31, 2019
Construction, land development and other land properties	$	9,816	$	11,482
1-4 family residential properties		2,499		3,453
Nonfarm, nonresidential properties		12,532		14,313
Total other real estate	$	24,847	$	29,248

At March 31, 2020 and December 31, 2019, other real estate by geographic location consisted of the following ($ in thousands):

	March 31, 2020		December 31, 2019
Alabama	$	6,229	$	8,133
Florida		4,835		5,877
Mississippi (1)		13,296		14,919
Tennessee (2)		487		319
Texas		—		—
Total other real estate	$	24,847	$	29,248

(1) Mississippi includes Central and Southern Mississippi Regions.

(2) Tennessee includes Memphis, Tennessee and Northern Mississippi Regions.

At March 31, 2020 and December 31, 2019, the balance of other real estate included $2.5 million and $3.5 million, respectively, of foreclosed residential real estate properties recorded as a result of obtaining physical possession of the property. At March 31, 2020 and December 31, 2019, the recorded investment of consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process was $767 thousand and $953 thousand, respectively.

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Securities Available for Sale and Held to Maturity

3 Months Ended

Mar. 31, 2020

Investments Debt And Equity Securities [Abstract]

Securities Available for Sale and Held to Maturity

Note 2 – Securities Available for Sale and Held to Maturity

Financial Accounting Standards Board (FASB) Accounting Standard Update (ASU) 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” was adopted by Trustmark on January 1, 2020.  ASU 2016-13 introduces the current expected credit losses methodology for estimating allowances for credit losses. ASU 2016-13 applies to all financial instruments carried at amortized cost, including securities held to maturity, and makes targeted improvements to the accounting for credit losses on securities available for sale.

Under ASU 2016-13, the allowance for credit losses is an estimate measured using relevant information about past events, including historical credit loss experience on financial assets with similar risk characteristics, current conditions, and reasonable and supportable forecasts that affect the collectability of the remaining cash flows over the contractual term of the financial assets.

In order to comply with ASU 2016-13, Trustmark conducted a review of its investment portfolio and determined that for certain classes of securities it would be appropriate to assume the expected credit loss to be zero.  This zero-credit loss assumption applies to debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government.  The reasons behind the adoption of the zero-credit loss assumption are as follows:

• High credit rating

• Long history with no credit losses

• Guaranteed by a sovereign entity

• Widely recognized as “risk-free rate”

• Can print its own currency

• Currency is routinely held by central banks, used in international commerce, and commonly viewed as reserve currency

• Currently under the U.S. Government conservatorship or receivership

Trustmark will continuously monitor any changes in economic conditions, credit downgrades, changes to explicit or implicit guarantees granted to certain debt issuers, and any other relevant information that would indicate potential credit deterioration and prompt Trustmark to reconsider its zero-credit loss assumption.

At the date of adoption, Trustmark’s estimated allowance for credit losses on securities available for sale and held to maturity under ASU 2016-13 was deemed immaterial due to the composition of these portfolios. Both portfolios consist primarily of U.S. government agency guaranteed mortgage-backed securities for which the risk of loss is minimal. Therefore, Trustmark did not recognize a cumulative effect adjustment through retained earnings related to the available for sale or held to maturity securities.

Securities Available for Sale

ASU 2016-13 makes targeted improvements to the accounting for credit losses on securities available for sale.  The concept of other-than-temporarily impaired has been replaced with the allowance for credit losses.  Unlike securities held to maturity, securities available for sale are evaluated on an individual level and pooling of securities is not allowed.  

Quarterly, Trustmark evaluates if any security has a fair value less than its amortized cost.  Once these securities are identified, in order to determine whether a decline in fair value resulted from a credit loss or other factors, Trustmark performs further analysis as outlined below:

• Review the extent to which the fair value is less than the amortized cost and observe the security’s lowest credit rating as reported by third-party credit ratings companies.

• The securities that violate the credit loss triggers above would be subjected to additional analysis that may include, but is not limited to: changes in market interest rates, changes in securities credit ratings, security type, service area economic factors, financial performance of the issuer/or obligor of the underlying issue and third-party guarantee.

• If Trustmark determines that a credit loss exists, the credit portion of the allowance will be measured using a discounted cash flow (DCF) analysis using the effective interest rate as of the security’s purchase date. The amount of credit loss Trustmark records will be limited to the amount by which the amortized cost exceeds the fair value.

The DCF analysis utilizes contractual maturities, as well as third-party credit ratings and cumulative default rates published annually by Moody’s Investor Service.

At March 31, 2020, the results of the analysis did not identify any securities that violate the credit loss triggers; therefore, no DCF analysis was performed and no credit loss was recognized on any of the securities available for sale.  

Accrued interest receivable is excluded from the estimate of credit losses for securities available for sale.  At March 31, 2020, accrued interest receivable totaled $4.5 million for securities available for sale and was reported in other assets on the accompanying consolidated balance sheet.

Securities Held to Maturity

ASU 2016-13 requires institutions to measure expected credit losses on financial assets carried at amortized cost on a collective or pool basis when similar risks exist.  Trustmark uses several levels of segmentation in order to measure expected credit losses:

• The portfolio is segmented into agency and non-agency securities.

• The non-agency securities are separated into municipal, mortgage, and corporate securities.

Each individual segment is categorized by third-party credit ratings.  

As discussed above, Trustmark has determined that for certain classes of securities it would be appropriate to assume the expected credit loss to be zero, which include debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government. This assumption will be reviewed and attested to quarterly.  Trustmark is using an internally built model to verify the accuracy of third-party provided calculations.  

At March 31, 2020, Trustmark’s securities held to maturity totaled $704.3 million.  The potential credit loss exposure was $31.6 million and consisted of municipal securities.  After applying appropriate probability of default and loss given default assumptions, the total amount of current expected credit losses was deemed immaterial.  Therefore, no reserve was recorded at March 31, 2020.  

Accrued interest receivable is excluded from the estimate of credit losses for securities held to maturity.  At March 31, 2020, accrued interest receivable totaled $1.7 million for securities held to maturity and was reported in other assets on the accompanying consolidated balance sheet.

At March 31, 2020, Trustmark had no securities held to maturity that were past due 30 days or more as to principal or interest payments.  Trustmark had no securities held to maturity classified as nonaccrual at March 31, 2020.  

Trustmark monitors the credit quality of securities held to maturity on a monthly basis through credit ratings.  The following table presents the amortized cost of Trustmark’s securities held to maturity by credit rating, as determined by Moody’s, at March 31, 2020 ($ in thousands):

	Securities Held to Maturity Amortized Cost
March 31, 2020
Aaa	$	672,519
Aa1 to Aa3		26,208
Not Rated (1)		5,549
Total	$	704,276

(1) Not rated securities primarily consist of Mississippi municipal general obligations.

The following tables are a summary of the amortized cost and estimated fair value of securities available for sale and held to maturity at March 31, 2020 and December 31, 2019 ($ in thousands):

	Securities Available for Sale									Securities Held to Maturity
March 31, 2020	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. Government agency obligations	$	21,704	$	78	$	(592	)	$	21,190	$	—	$	—	$	—		$	—
Obligations of states and political    subdivisions		23,084		488		—			23,572		31,758		383		(41	)		32,100
Mortgage-backed securities
Residential mortgage pass-through    securities
Guaranteed by GNMA		70,106		1,868		(3	)		71,971		10,492		501		—			10,993
Issued by FNMA and FHLMC		949,400		18,854		(925	)		967,329		91,971		1,565		—			93,536
Other residential mortgage-backed    securities
Issued or guaranteed by FNMA,    FHLMC or GNMA		615,004		19,071		—			634,075		463,175		21,848		—			485,023
Commercial mortgage-backed securities
Issued or guaranteed by FNMA,    FHLMC or GNMA		112,554		3,109		(21	)		115,642		106,880		2,915		(6	)		109,789
Total	$	1,791,852	$	43,468	$	(1,541	)	$	1,833,779	$	704,276	$	27,212	$	(47	)	$	731,441
December 31, 2019
U.S. Government agency obligations	$	22,965	$	69	$	(707	)	$	22,327	$	3,781	$	220	$	—		$	4,001
Obligations of states and political    subdivisions		24,952		513		—			25,465		31,781		434		(53	)		32,162
Mortgage-backed securities
Residential mortgage pass-through    securities
Guaranteed by GNMA		69,196		425		(369	)		69,252		10,820		266		(10	)		11,076
Issued by FNMA and FHLMC		714,350		2,171		(3,165	)		713,356		96,631		286		(370	)		96,547
Other residential mortgage-backed    securities
Issued or guaranteed by FNMA,    FHLMC or GNMA		656,162		3,777		(1,713	)		658,226		485,324		7,026		(656	)		491,694
Commercial mortgage-backed securities
Issued or guaranteed by FNMA,    FHLMC or GNMA		113,359		625		(206	)		113,778		109,762		1,042		(82	)		110,722
Total	$	1,600,984	$	7,580	$	(6,160	)	$	1,602,404	$	738,099	$	9,274	$	(1,171	)	$	746,202

During 2013, Trustmark reclassified approximately $1.099 billion of securities available for sale to securities held to maturity.  The securities were transferred at fair value, which became the cost basis for the securities held to maturity.  At the date of transfer, the net unrealized holding loss on the available for sale securities totaled approximately $46.6 million ($28.8 million, net of tax).  The net unrealized holding loss is amortized over the remaining life of the securities as a yield adjustment in a manner consistent with the amortization or accretion of the original purchase premium or discount on the associated security.  There were no gains or losses recognized as a result of the transfer.  At March 31, 2020, the net unamortized, unrealized loss on the transferred securities included in accumulated other comprehensive income (loss) in the accompanying balance sheet totaled approximately $11.2 million ($8.4 million, net of tax) compared to approximately $12.1 million ($9.1 million, net of tax) at December 31, 2019.

The tables below include securities with gross unrealized losses for which an allowance for credit losses has not been recorded and segregated by length of impairment at March 31, 2020 and December 31, 2019 ($ in thousands):

	Less than 12 Months					12 Months or More					Total
March 31, 2020	Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses
U.S. Government agency obligations	$	3,245	$	(23	)	$	12,708	$	(569	)	$	15,953	$	(592	)
Obligations of states and political subdivisions		—		—			6,217		(41	)		6,217		(41	)
Mortgage-backed securities
Residential mortgage pass-through securities
Guaranteed by GNMA		65		(1	)		774		(2	)		839		(3	)
Issued by FNMA and FHLMC		17,254		(136	)		55,755		(789	)		73,009		(925	)
Commercial mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or    GNMA		8,468		(17	)		672		(10	)		9,140		(27	)
Total	$	29,032	$	(177	)	$	76,126	$	(1,411	)	$	105,158	$	(1,588	)
December 31, 2019
U.S. Government agency obligations	$	6,585	$	(105	)	$	12,886	$	(602	)	$	19,471	$	(707	)
Obligations of states and political subdivisions		—		—			6,216		(53	)		6,216		(53	)
Mortgage-backed securities
Residential mortgage pass-through securities
Guaranteed by GNMA		23,544		(107	)		18,529		(272	)		42,073		(379	)
Issued by FNMA and FHLMC		112,879		(230	)		278,120		(3,305	)		390,999		(3,535	)
Other residential mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or    GNMA		158,341		(738	)		151,271		(1,631	)		309,612		(2,369	)
Commercial mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or    GNMA		51,312		(167	)		14,155		(121	)		65,467		(288	)
Total	$	352,661	$	(1,347	)	$	481,177	$	(5,984	)	$	833,838	$	(7,331	)

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 maturity. Prior to the adoption of FASB ASU 2016-13, Trustmark did not consider these investments to be other-than-temporarily impaired at March 31, 2019.  There were no other-than-temporary impairments for the three months ended 2019.

Security Gains and Losses

During the three months ended March 31, 2020 and 2019, there were no gross realized gains or losses as a result of calls and dispositions of securities.  Realized gains and losses are determined using the specific identification method and are included in noninterest income as security gains (losses), net.

Securities Pledged

Securities with a carrying value of $1.924 billion and $1.770 billion at March 31, 2020 and December 31, 2019, respectively, were pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law.  At both March 31, 2020 and December 31, 2019, 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 March 31, 2020, by contractual maturity, are shown below ($ in thousands).  Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Securities Available for Sale				Securities Held to Maturity
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	20,505	$	20,617	$	5,079	$	5,115
Due after one year through five years		1,304		1,317		26,679		26,985
Due after five years through ten years		2,499		2,456		—		—
Due after ten years		20,480		20,372		—		—
		44,788		44,762		31,758		32,100
Mortgage-backed securities		1,747,064		1,789,017		672,518		699,341
Total	$	1,791,852	$	1,833,779	$	704,276	$	731,441

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Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of cash flows specific transaction amounts [Abstract]
Interest expense paid on deposits and borrowings	$ 16,807	$ 20,501
Noncash transfers from loans to other real estate	336	785
Securities purchased not settled		1,095
Finance right-of-use assets resulting from lease liabilities		11,230
Operating right-of-use assets resulting from lease liabilities	$ 671	$ 33,861

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Revenue from Contracts with Customers

3 Months Ended

Mar. 31, 2020

Revenue From Contract With Customer [Abstract]

Revenue from Contracts with Customers

Note 10 – Revenue from Contracts with Customers

Trustmark accounts for revenue from contracts with customers in accordance with FASB ASC Topic 606, “Revenue from Contracts with Customers,” which provides that revenue be recognized in a manner that depicts the transfer of goods or services to a customer in an amount that reflects the consideration Trustmark expects to be entitled to in exchange for those goods or services.  Revenue from contracts with customers is recognized either over time in a manner that depicts Trustmark’s performance, or at a point in time when control of the goods or services are transferred to the customer.  Trustmark’s noninterest income, excluding all of mortgage banking, net and securities gains (losses), net and portions of bank card and other fees and other income, are considered within the scope of FASB ASC Topic 606.  Gains or losses on the sale of other real estate, which are included in Trustmark’s noninterest expense as other real estate expense, are also within the scope of FASB ASC Topic 606.

Trustmark records a gain or loss from the sale of other real estate when control of the property transfers to the buyer.  Trustmark records the gain or loss from the sale of other real estate in noninterest expense as other real estate expense, net.  Other real estate sales for the three months ended March 31, 2020 resulted in a net loss of $70 thousand, compared to a net gain of $122 thousand for the three months ended March 31, 2019.

The following table presents noninterest income disaggregated by reportable operating segment and revenue stream for the periods presented ($ in thousands):

	Three Months Ended March 31, 2020							Three Months Ended March 31, 2019
	Topic 606		Not Topic 606 (1)			Total		Topic 606		Not Topic 606 (1)			Total
General Banking Segment
Service charges on deposit accounts	$	10,012	$	—		$	10,012	$	10,240	$	—		$	10,240
Bank card and other fees		6,726		(1,377	)		5,349		6,865		302			7,167
Mortgage banking, net		—		27,483			27,483		—		3,442			3,442
Wealth management		86		—			86		91		—			91
Other, net		1,764		482			2,246		2,244		(271	)		1,973
Total noninterest income	$	18,588	$	26,588		$	45,176	$	19,440	$	3,473		$	22,913
Wealth Management Segment
Service charges on deposit accounts	$	20	$	—		$	20	$	25	$	—		$	25
Bank card and other fees		6		—			6		24		—			24
Wealth management		8,451		—			8,451		7,392		—			7,392
Other, net		26		13			39		236		26			262
Total noninterest income	$	8,503	$	13		$	8,516	$	7,677	$	26		$	7,703
Insurance Segment
Insurance commissions	$	11,550	$	—		$	11,550	$	10,871	$	—		$	10,871
Other, net		22		—			22		4		—			4
Total noninterest income	$	11,572	$	—		$	11,572	$	10,875	$	—		$	10,875
Consolidated
Service charges on deposit accounts	$	10,032	$	—		$	10,032	$	10,265	$	—		$	10,265
Bank card and other fees		6,732		(1,377	)		5,355		6,889		302			7,191
Mortgage banking, net		—		27,483			27,483		—		3,442			3,442
Insurance commissions		11,550		—			11,550		10,871		—			10,871
Wealth management		8,537		—			8,537		7,483		—			7,483
Other, net		1,812		495			2,307		2,484		(245	)		2,239
Total noninterest income	$	38,663	$	26,601		$	65,264	$	37,992	$	3,499		$	41,491

(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.

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Other Real Estate - Changes and Gains (Losses), Net on Other Real Estate (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward
Balance at beginning of period	$ 29,248	$ 29,248
Additions	336	785
Disposals	(3,741)	(1,658)
Write-downs	(996)	(1,656)
Balance at end of period	24,847
Gains (losses), net on the sale of other real estate included in other real estate expense	$ (70)	$ 122

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Consolidated Statements of Income (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Interest Income
Interest and fees on LHFS & LHFI		$ 106,345	$ 106,795
Interest and fees on acquired loans	[1]		1,916
Interest on securities:
Taxable		12,948	14,665
Tax exempt		361	510
Interest on federal funds sold and securities purchased under reverse repurchase agreements			2
Other interest income		740	1,603
Total Interest Income		120,394	125,491
Interest Expense
Interest on deposits		14,957	19,570
Interest on federal funds purchased and securities sold under repurchase agreements		625	288
Other interest expense		860	825
Total Interest Expense		16,442	20,683
Net Interest Income		103,952	104,808
Provision for credit losses (PCL)	[1]	20,581	1,611
Provision for loan losses, acquired loans	[1]		78
Net Interest Income After PCL		83,371	103,119
Noninterest Income
Service charges on deposit accounts		10,032	10,265
Bank card and other fees		5,355	7,191
Mortgage banking, net		27,483	3,442
Insurance commissions		11,550	10,871
Wealth management		8,537	7,483
Other, net		2,307	2,239
Total Noninterest Income		65,264	41,491
Noninterest Expense
Salaries and employee benefits		69,148	60,954
Services and fees		19,930	16,968
Net occupancy - premises		6,286	6,454
Equipment expense		5,616	5,924
Other real estate expense, net		1,294	1,752
Credit loss expense related to off-balance sheet credit exposures	[1]	6,783
Other expense		14,753	13,969
Total Noninterest Expense		123,810	106,021
Income Before Income Taxes		24,825	38,589
Income taxes		2,607	5,250
Net Income		$ 22,218	$ 33,339
Earnings Per Share
Basic		$ 0.35	$ 0.51
Diluted		$ 0.35	$ 0.51

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

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Securities Sold Under Repurchase Agreements - Schedule of Securities Sold Under Repurchase Agreements (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements	$ 48,140	$ 53,572
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	18,461	24,282
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]
Securities sold under repurchase agreements by collateral pledged
Total securities sold under repurchase agreements	$ 29,679	$ 29,290

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Acquired Loans - Changes in the Carrying Value of Acquired Loans (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning		$ 71,786
FASB ASU 2016-13 adoption adjustment		19,949
Accretion to interest income			$ 1,563
Carrying value, net, ending				$ 71,786
Acquired Not ASC 310-30 [Member]
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning	[1]	0	2,811	2,811
Transfers	[1],[2]			(2,926)
Accretion to interest income	[1]	0		115
Payments received, net	[1]	0		0
Other	[1],[3]	0		0
Change in allowance for loan losses, acquired loans	[1]	0		0
Carrying value, net, ending	[1]	0		0
Acquired Not ASC 310-30 [Member] | ASU 2016-13 [Member]
Carrying value of acquired loans [Abstract]
FASB ASU 2016-13 adoption adjustment	[1]	0
Acquired Impaired [Member]
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning		71,786	$ 102,890	102,890
Transfers	[2]			0
Accretion to interest income		0		5,532
Payments received, net		0		(37,230)
Other	[3]	0		178
Change in allowance for loan losses, acquired loans		0		416
Carrying value, net, ending		0		$ 71,786
Acquired Impaired [Member] | ASU 2016-13 [Member]
Carrying value of acquired loans [Abstract]
FASB ASU 2016-13 adoption adjustment		$ (71,786)

[1] “Acquired Not ASC 310-30” loans consist of loans that are not in scope for FASB ASC Subtopic 310-30.

[2] “Acquired Not ASC 310-30” loans transferred to LHFI due to the discount on these loans being fully amortized.

[3] Includes miscellaneous timing adjustments as well as acquired loan terminations through foreclosure, charge-off and other terminations.

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Other Real Estate - Other Real Estate, By Geographic Location (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Other real estate, excluding covered other real estate [Line Items]
Total other real estate		$ 24,847	$ 29,248	$ 24,847	$ 29,248	$ 32,139	$ 34,668
Alabama [Member]
Other real estate, excluding covered other real estate [Line Items]
Total other real estate		6,229	8,133
Florida [Member]
Other real estate, excluding covered other real estate [Line Items]
Total other real estate		4,835	5,877
Mississippi [Member]
Other real estate, excluding covered other real estate [Line Items]
Total other real estate	[1]	13,296	14,919
Tennessee [Member]
Other real estate, excluding covered other real estate [Line Items]
Total other real estate	[2]	$ 487	$ 319

[1] Mississippi includes Central and Southern Mississippi Regions.

[2] Tennessee includes Memphis, Tennessee and Northern Mississippi Regions.

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Leases - Balance Sheet Information and Weighted-Average Lease Terms and Discount Rates Related to Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Finance lease right-of-use assets, net of accumulated depreciation	$ 8,829	$ 9,326
Finance lease liabilities	9,061	9,520
Operating lease right-of-use assets	30,839	31,182
Operating lease liabilities	$ 32,055	$ 32,354
Weighted-average lease term
Finance leases	8 years 7 months 2 days	8 years 7 months 13 days
Operating leases	8 years 10 months 20 days	9 years 18 days
Weighted-average discount rate
Finance leases	3.03%	3.01%
Operating leases	3.48%	3.51%

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Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Operating Activities
Net income per consolidated statements of income		$ 22,218	$ 33,339
Adjustments to reconcile net income to net cash provided by operating activities:
Credit loss expense, net	[1]	27,364	1,689
Depreciation and amortization		8,996	9,337
Net amortization of securities		1,918	2,007
Gains on sales of loans, net		(7,085)	(3,576)
Compensation expense, long-term incentive plan		1,394	1,002
Deferred income tax provision		(11,600)	(1,400)
Proceeds from sales of loans held for sale		324,167	212,508
Purchases and originations of loans held for sale		(416,687)	(235,550)
Originations of mortgage servicing rights		(3,649)	(2,507)
Earnings on bank-owned life insurance		(1,292)	(1,354)
Net change in other assets		(49,822)	(1,576)
Net change in other liabilities		(204)	(9,853)
Other operating activities, net		25,119	10,806
Net cash from operating activities		(79,163)	14,872
Investing Activities
Proceeds from maturities, prepayments and calls of securities held to maturity		34,459	25,361
Proceeds from maturities, prepayments and calls of securities available for sale		86,129	106,990
Purchases of securities available for sale		(278,691)	0
Net proceeds from bank-owned life insurance		280	0
Net change in federal funds sold and securities purchased under reverse repurchase agreements		(2,000)	830
Net change in member bank stock		(107)	(70)
Net change in loans		(162,097)	(148,108)
Purchases of premises and equipment		(4,154)	(4,407)
Proceeds from sales of premises and equipment		0	1,848
Proceeds from sales of other real estate		3,671	1,780
Purchases of software		(1,805)	(3,753)
Investments in tax credit and other partnerships		(141)	(3,426)
Purchase of insurance book of business		(3,097)	(81)
Net cash from investing activities		(327,553)	(23,036)
Financing Activities
Net change in deposits		330,207	170,404
Net change in federal funds purchased and securities sold under repurchase agreements		165,801	(3,604)
Net change in short-term borrowings		(127)	(90)
Payments on long-term FHLB advances		(17)	(17)
Payments under finance lease obligations		(459)	(513)
Common stock dividends		(14,706)	(15,033)
Repurchase and retirement of common stock		(27,538)	(36,893)
Shares withheld to pay taxes, long-term incentive plan		(1,020)	(1,604)
Net cash from financing activities		452,141	112,650
Net change in cash and cash equivalents		45,425	104,486
Cash and cash equivalents at beginning of period		358,916	349,561
Cash and cash equivalents at end of period		$ 404,341	$ 454,047

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

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Acquired Loans - Aging Analysis of Past Due and Nonaccrual Acquired Loans (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	$ 2,296
Nonaccrual	0	[1]
Current	70,305
Acquired Loans	72,601
Past Due 30 to 59 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	843
Past Due 60 to 89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	146
Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	1,307	[2]
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	132
Nonaccrual	0	[1]
Current	4,639
Acquired Loans	4,771
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	94
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	38	[2]
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	1,193
Nonaccrual	0	[1]
Current	16,332
Acquired Loans	17,525
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	696
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	131
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	366	[2]
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	887
Nonaccrual	0	[1]
Current	37,319
Acquired Loans	38,206
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	36
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	851	[2]
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	53
Nonaccrual	0	[1]
Current	3,893
Acquired Loans	3,946
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	1
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	52	[2]
Commercial and Industrial Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0
Nonaccrual	0	[1]
Current	5,035
Acquired Loans	5,035
Commercial and Industrial Loans [Member] | Past Due 30 to 59 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0
Commercial and Industrial Loans [Member] | Past Due 60 to 89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0	[2]
Consumer Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	31
Nonaccrual	0	[1]
Current	489
Acquired Loans	520
Consumer Loans [Member] | Past Due 30 to 59 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	16
Consumer Loans [Member] | Past Due 60 to 89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	15
Consumer Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0	[2]
Other Loans [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0
Nonaccrual	0	[1]
Current	2,598
Acquired Loans	2,598
Other Loans [Member] | Past Due 30 to 59 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0
Other Loans [Member] | Past Due 60 to 89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0
Other Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	$ 0	[2]

[1] Acquired loans not accounted for under FASB ASC Subtopic 310-30.

[2] Past due 90 days or more but still accruing interest.

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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Schedule of Amortized Cost Basis of Loans on Nonaccrual Status (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	$ 27,138
Total Nonaccrual	52,992	$ 53,226
Loans Past Due 90 Days or More Still Accruing	708
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	586
Total Nonaccrual	950	897
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	519
Total Nonaccrual	4,991
Loans Past Due 90 Days or More Still Accruing	40
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	5,476
Total Nonaccrual	7,323	7,700
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	65
Total Nonaccrual	1,076	1,032
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Nonaccrual		16,810
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	1,504
Total Nonaccrual	12,466
Loans Past Due 90 Days or More Still Accruing	306
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Nonaccrual With No ACL	18,988
Total Nonaccrual	21,156	21,775
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Nonaccrual	84	108
Loans Past Due 90 Days or More Still Accruing	296
State and Other Political Subdivision Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Nonaccrual	4,079	$ 4,079
Other Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Nonaccrual	867
Loans Past Due 90 Days or More Still Accruing	$ 66

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Securities Available for Sale and Held to Maturity - Securities with Gross Unrealized Losses, Segregated by Length of Impairment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Estimated Fair Value, Less than 12 Months	$ 29,032	$ 352,661
Estimated Fair Value, 12 Months or More	76,126	481,177
Estimated Fair Value, Total	105,158	833,838
Gross Unrealized (Losses), Less than 12 Months	(177)	(1,347)
Gross Unrealized (Losses), 12 Months or More	(1,411)	(5,984)
Gross Unrealized (Losses), Total	(1,588)	(7,331)
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	3,245	6,585
Estimated Fair Value, 12 Months or More	12,708	12,886
Estimated Fair Value, Total	15,953	19,471
Gross Unrealized (Losses), Less than 12 Months	(23)	(105)
Gross Unrealized (Losses), 12 Months or More	(569)	(602)
Gross Unrealized (Losses), Total	(592)	(707)
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	0	0
Estimated Fair Value, 12 Months or More	6,217	6,216
Estimated Fair Value, Total	6,217	6,216
Gross Unrealized (Losses), Less than 12 Months	0	0
Gross Unrealized (Losses), 12 Months or More	(41)	(53)
Gross Unrealized (Losses), Total	(41)	(53)
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	65	23,544
Estimated Fair Value, 12 Months or More	774	18,529
Estimated Fair Value, Total	839	42,073
Gross Unrealized (Losses), Less than 12 Months	(1)	(107)
Gross Unrealized (Losses), 12 Months or More	(2)	(272)
Gross Unrealized (Losses), Total	(3)	(379)
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	17,254	112,879
Estimated Fair Value, 12 Months or More	55,755	278,120
Estimated Fair Value, Total	73,009	390,999
Gross Unrealized (Losses), Less than 12 Months	(136)	(230)
Gross Unrealized (Losses), 12 Months or More	(789)	(3,305)
Gross Unrealized (Losses), Total	(925)	(3,535)
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	8,468	51,312
Estimated Fair Value, 12 Months or More	672	14,155
Estimated Fair Value, Total	9,140	65,467
Gross Unrealized (Losses), Less than 12 Months	(17)	(167)
Gross Unrealized (Losses), 12 Months or More	(10)	(121)
Gross Unrealized (Losses), Total	$ (27)	(288)
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		158,341
Estimated Fair Value, 12 Months or More		151,271
Estimated Fair Value, Total		309,612
Gross Unrealized (Losses), Less than 12 Months		(738)
Gross Unrealized (Losses), 12 Months or More		(1,631)
Gross Unrealized (Losses), Total		$ (2,369)

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Acquired Loans (Tables)

3 Months Ended

Mar. 31, 2020

Certain Loans Acquired In Transfer Not Accounted For As Debt Securities [Abstract]

Schedule of Acquired Loans

At December 31, 2019, acquired loans consisted of the following ($ in thousands):

	December 31, 2019
Loans secured by real estate:
Construction, land development and other land	$	4,771
Secured by 1-4 family residential properties		17,525
Secured by nonfarm, nonresidential properties		38,206
Other real estate secured		3,946
Commercial and industrial loans		5,035
Consumer loans		520
Other loans		2,598
Acquired loans		72,601
Less allowance for loan losses, acquired loans		815
Net acquired loans	$	71,786

Changes in the Carrying Value of Acquired Loans

The following table presents changes in the net carrying value of the acquired loans for the periods presented ($ in thousands):

	Acquired Impaired			Acquired Not ASC 310-30 (1)
Carrying value, net at January 1, 2019	$	102,890		$	2,811
Transfers (2)		—			(2,926	)
Accretion to interest income		5,532			115
Payments received, net		(37,230	)		—
Other (3)		178			—
Change in allowance for loan losses, acquired loans		416			—
Carrying value, net at December 31, 2019		71,786			—
FASB ASU 2016-13 adoption adjustment		(71,786	)		—
Accretion to interest income		—			—
Payments received, net		—			—
Other (3)		—			—
Change in allowance for loan losses, acquired loans		—			—
Carrying value, net at March 31, 2020	$	—		$	—

(1) “Acquired Not ASC 310-30” loans consist of loans that are not in scope for FASB ASC Subtopic 310-30.

(2) “Acquired Not ASC 310-30” loans transferred to LHFI due to the discount on these loans being fully amortized.

(3) Includes miscellaneous timing adjustments as well as acquired loan terminations through foreclosure, charge-off and other terminations.

Changes in Accretable Yield of Acquired Loans

The following table presents changes in the accretable yield for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Accretable yield at beginning of period	$	(14,816	)	$	(17,722	)
FASB ASU 2016-13 adoption adjustment		14,816			—
Accretion to interest income		—			1,563
Disposals, net		—			469
Reclassification from nonaccretable difference (1)		—			(1,725	)
Accretable yield at end of period	$	—		$	(17,415	)

(1) Reclassifications from nonaccretable difference are due to lower loss expectations and improvements in expected cash flows.

Components of the Allowance for Loan Losses on Acquired Loans

The following table presents the components of the allowance for loan losses on acquired loans for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	815		$	1,231
FASB ASU 2016-13 adoption adjustment		(815	)		—
Net (charge-offs) recoveries		—			(12	)
Provision for loan losses, acquired loans		—			78
Balance at end of period	$	—		$	1,297

Acquired Loans by Loan Class and Credit Quality Indicator

The table below presents the acquired loans by loan class and credit quality indicator at December 31, 2019 ($ in thousands):

	December 31, 2019
			Commercial Loans
			Pass - Categories 1-6		Special Mention - Category 7		Substandard - Category 8		Doubtful - Category 9		Subtotal
Loans secured by real estate:
Construction, land development    and other land			$	4,022	$	—	$	192	$	—	$	4,214
Secured by 1-4 family    residential properties				3,164		42		580		—		3,786
Secured by nonfarm,    nonresidential properties				27,848		—		9,972		386		38,206
Other real estate secured				3,878		—		68		0		3,946
Commercial and industrial loans				3,419		—		—		1,616		5,035
Consumer loans				—		—		—		—		—
Other loans				2,591		—		7		—		2,598
Total acquired loans			$	44,922	$	42	$	10,819	$	2,002	$	57,785
	Consumer Loans
	Current		Past Due 30-89 Days		Past Due 90 Days or More		Nonaccrual (1)		Subtotal		Total Acquired Loans
Loans secured by real estate:
Construction, land development    and other land	$	463	$	94	$	—	$	—	$	557	$	4,771
Secured by 1-4 family    residential properties		12,843		615		281		—		13,739		17,525
Secured by nonfarm,    nonresidential properties		—		—		—		—		—		38,206
Other real estate secured		—		—		—		—		—		3,946
Commercial and industrial loans		—		—		—		—		—		5,035
Consumer loans		489		31		—		—		520		520
Other loans		—		—		—		—		—		2,598
Total acquired loans	$	13,795	$	740	$	281	$	—	$	14,816	$	72,601

(1) Acquired loans not accounted for under FASB ASC Subtopic 310-30.

Aging Analysis of Past Due and Nonaccrual Acquired Loans

The following table provides an aging analysis of contractually past due and nonaccrual acquired loans at December 31, 2019 ($ in thousands):

	December 31, 2019
	Past Due
	30-59 Days		60-89 Days		90 Days or More (1)		Total		Nonaccrual (2)		Current Loans		Total Acquired Loans
Loans secured by real estate:
Construction, land development and    other land	$	94	$	—	$	38	$	132	$	—	$	4,639	$	4,771
Secured by 1-4 family residential    properties		696		131		366		1,193		—		16,332		17,525
Secured by nonfarm, nonresidential    properties		36		—		851		887		—		37,319		38,206
Other real estate secured		1		—		52		53		—		3,893		3,946
Commercial and industrial loans		—		—		—		—		—		5,035		5,035
Consumer loans		16		15		—		31		—		489		520
Other loans		—		—		—		—		—		2,598		2,598
Total acquired loans	$	843	$	146	$	1,307	$	2,296	$	—	$	70,305	$	72,601

(1) Past due 90 days or more but still accruing interest.

(2) Acquired loans not accounted for under FASB ASC Subtopic 310-30.

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Deposits (Tables)

3 Months Ended

Mar. 31, 2020

Deposits [Abstract]

Deposits Summary

At March 31, 2020 and December 31, 2019, deposits consisted of the following ($ in thousands):

	March 31, 2020		December 31, 2019
Noninterest-bearing demand	$	2,977,058	$	2,891,215
Interest-bearing demand		3,400,264		3,125,914
Savings		3,602,515		3,590,509
Time		1,595,927		1,637,919
Total	$	11,575,764	$	11,245,557

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Defined Benefit and Other Postretirement Benefits

3 Months Ended

Mar. 31, 2020

Compensation And Retirement Disclosure [Abstract]

Defined Benefit and Other Postretirement Benefits

Note 11 – 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 March 31,
	2020			2019
Service cost	$	64		$	53
Interest cost		60			90
Expected return on plan assets		(38	)		(51	)
Recognized net loss due to lump sum settlements		—			31
Recognized net actuarial loss		81			93
Net periodic benefit cost	$	167		$	216

For the plan year ending December 31, 2020, Trustmark’s minimum required contribution to the Continuing Plan is $306 thousand; however, Management and the Board of Directors of Trustmark will monitor the Continuing Plan throughout 2020 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 measurement date for the plan is December 31.  As a result of mergers prior to 2014, Trustmark became the administrator of small nonqualified supplemental retirement plans, for which the plan benefits were frozen prior to the merger date.

The following table presents information regarding the net periodic benefit cost for Trustmark’s nonqualified supplemental retirement plans for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020		2019
Service cost	$	19	$	27
Interest cost		414		541
Amortization of prior service cost		37		63
Recognized net actuarial loss		246		162
Net periodic benefit cost	$	716	$	793

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Leases

3 Months Ended

Mar. 31, 2020

Leases [Abstract]

Leases

Note 7 – Leases

The following table details the components of net lease cost for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Finance leases
Amortization of right-of-use assets	$	497		$	503
Interest on lease liabilities		67			81
Operating lease cost		1,290			1,300
Short-term lease cost		109			80
Variable lease cost		347			344
Sublease income		(99	)		(87	)
Net lease cost	$	2,211		$	2,221

The following table details the cash payments included in the measurement of lease liabilities during the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020		2019
Finance leases
Operating cash flows included in operating activities	$	67	$	265
Financing cash flows included in payments under finance lease obligations		459		513
Operating leases
Operating cash flows (fixed payments) included in other operating activities, net		1,246		1,246
Operating cash flows (liability reduction) included in other operating activities, net		970		941

The following table details balance sheet information, as well as weighted-average lease terms and discount rates, related to leases at March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020			December 31, 2019
Finance lease right-of-use assets, net of accumulated depreciation	$	8,829		$	9,326
Finance lease liabilities		9,061			9,520
Operating lease right-of-use assets		30,839			31,182
Operating lease liabilities		32,055			32,354
Weighted-average lease term
Finance leases	8.59 years			8.62 years
Operating leases	8.89 years			9.05 years
Weighted-average discount rate
Finance leases		3.03	%		3.01	%
Operating leases		3.48	%		3.51	%

At March 31, 2020, future minimum rental commitments under finance and operating leases were as follows ($ in thousands):

	Finance Leases			Operating Leases
2020 (excluding the three months ended March 31, 2020)	$	1,443		$	3,742
2021		1,615			4,648
2022		1,556			4,173
2023		871			4,136
2024		572			4,040
Thereafter		4,452			16,726
Total minimum lease payments		10,509			37,465
Less imputed interest		(1,448	)		(5,410	)
Lease liabilities	$	9,061		$	32,055

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Fair Value - Financial Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 1,833,779	$ 1,602,404
Loans held for sale	325,389	226,347
Mortgage servicing rights	56,437	79,394	$ 86,842	$ 95,596
U.S. Government Agency Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	21,190	22,327
Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	23,572	25,465
Recurring Basis [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,833,779	1,602,404
Loans held for sale	325,389	226,347
Mortgage servicing rights	56,437	79,394
Other assets - derivatives	72,664	17,956
Other liabilities - derivatives	12,624	6,063
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	21,190	22,327
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	23,572	25,465
Recurring Basis [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,789,017	1,554,612
Level 1 [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	0	0
Other assets - derivatives	21,575	244
Other liabilities - derivatives	221	4,414
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	1,833,779	1,602,404
Loans held for sale	325,389	226,347
Mortgage servicing rights	0	0
Other assets - derivatives	41,263	16,273
Other liabilities - derivatives	12,403	1,649
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	21,190	22,327
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	23,572	25,465
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	1,789,017	1,554,612
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	56,437	79,394
Other assets - derivatives	9,826	1,439
Other liabilities - derivatives	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

XML

Shareholders' Equity - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended	37 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Apr. 01, 2020	Dec. 31, 2019	Apr. 01, 2019	Mar. 11, 2016
Stockholders Equity [Line items]
Capital conservation buffer rate	2.50%		2.50%			2.50%
Stock Repurchase Program 1 [Member] | Common Stock [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase								$ 100.0
Repurchase shares of common stock		1,200,000		3,200,000
Repurchase shares of common stock, value		$ 36.9		$ 100.0
Stock Repurchase Program 2 [Member] | Common Stock [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase							$ 100.0
Repurchase shares of common stock	887,000		1,500,000
Repurchase shares of common stock, value	$ 27.5		$ 47.2
Stock Repurchase Program 3 [Member] | Common Stock [Member] | Subsequent Event [Member]
Stockholders Equity [Line items]
Amount of stock authorized for repurchase					$ 100.0

XML

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI

3 Months Ended

Mar. 31, 2020

Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI

Note 3 – LHFI and Allowance for Credit Losses, LHFI

Trustmark adopted the amendments of FASB ASU 2016-13, on January 1, 2020.  The amendments of ASU 2016-13 created FASB Accounting Standards Codification (ASC) Topic 326, “Financial Instruments – Credit Losses,” which, among other things, replace much of the guidance and disclosures previously provided in FASB ASC Topic 310, “Receivables.”  The guidance in FASB ASC Topic 326 replaces the incurred loss methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit losses.  In accordance with FASB ASC Subtopic 326-20, “Financial Instruments – Credit Losses – Measured at Amortized Cost,” Trustmark has developed an allowance for credit losses (ACL) methodology effective January 1, 2020, which replaces its previous allowance for loan losses methodology.  See the section captioned “Allowance for Credit Losses (ACL)” within this note for additional information regarding Trustmark’s ACL.  Trustmark adopted FASB ASC Topic 326 using the modified retrospective approach prescribed by the amendments of ASU 2016-13; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

At March 31, 2020 and December 31, 2019, LHFI consisted of the following ($ in thousands):

	March 31, 2020		December 31, 2019
Loans secured by real estate:
Construction, land development and other land	$	486,265	$	1,162,791
Other secured by 1-4 family residential properties		584,981		1,855,913
Secured by nonfarm, nonresidential properties		2,575,422		2,475,245
Other real estate secured		838,573		724,480
Other loans secured by real estate: (1)
Other construction		650,124		—
Secured by 1-4 family residential properties		1,267,084		—
Commercial and industrial loans		1,476,777		1,477,896
Consumer loans		173,678		175,738
State and other political subdivision loans		938,637		967,944
Other commercial loans (1)		576,379		495,621
LHFI		9,567,920		9,335,628
Less ACL		100,564		84,277
Net LHFI	$	9,467,356	$	9,251,351

(1) In accordance with the guidance in FASB ASC Topic 326, Trustmark redefined its LHFI portfolio segments and related loan classes based on the level at which risk is monitored within the ACL methodology. The other loans secured by real estate portfolio segment and related loan classes were separated from the loans secured by real estate portfolio segment. The other construction loans were segregated from the construction, land development and other land loans. The other loans secured by 1-4 family residential properties were segregated from the loans secured by 1-4 family residential properties and the loans secured by 1-4 family residential properties were redefined in the other loans secured by real estate portfolio segment. Other loans were redefined as other commercial loans.

Accrued interest receivable is not included in the amortized cost basis of Trustmark’s LHFI.  At March 31, 2020, accrued interest receivable for LHFI totaled $30.8 million 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 March 31, 2020, 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

Past due LHFI are loans contractually past due 30 days or more as to principal or interest payments.  A LHFI is classified as nonaccrual, and the accrual of interest on such loan is discontinued, when the contractual payment of principal or interest becomes 90 days past due on commercial credits and 120 days past due on non-business purpose credits.  In addition, a credit may be placed on nonaccrual at any other time Management has serious doubts about further collectibility of principal or interest according to the contractual terms, even though the loan is currently performing.  A LHFI may remain in accrual status if it is in the process of collection and well secured.  When a LHFI is placed in nonaccrual status, interest accrued but not received is reversed against interest income.  Interest payments received on nonaccrual LHFI are applied against principal under the cost-recovery method, until qualifying for return to accrual status.  Under the cost-recovery method, interest income is not recognized until the principal balance is reduced to zero.  LHFI are restored to accrual status when the obligation is brought current or has performed in accordance with the contractual terms for a reasonable period of time and the ultimate collectibility of the total contractual principal and interest is no longer in doubt.

No material interest income was recognized in the income statement on nonaccrual LHFI for each of the periods ended March 31, 2020 and 2019.

The following table provides the amortized cost basis of loans on nonaccrual status and loans past due 90 days or more still accruing interest as of March 31, 2020 ($ in thousands):

	March 31, 2020
	Nonaccrual With No ACL		Total Nonaccrual		Loans Past Due 90 Days or More Still Accruing
Loans secured by real estate:
Construction, land development and other land	$	586	$	950	$	—
Other secured by 1-4 family residential properties		519		4,991		40
Secured by nonfarm, nonresidential properties		5,476		7,323		—
Other real estate secured		65		1,076		—
Other loans secured by real estate:
Other construction		—		—		—
Secured by 1-4 family residential properties		1,504		12,466		306
Commercial and industrial loans		18,988		21,156		—
Consumer loans		—		84		296
State and other political subdivision loans		—		4,079		—
Other commercial loans		—		867		66
Total	$	27,138	$	52,992	$	708

The following table provides an aging analysis of the amortized cost basis of past due LHFI at March 31, 2020 ($ in thousands):

	March 31, 2020
	Past Due
	30-59 Days		60-89 Days		90 Days or More		Total Past Due		Current Loans		Total LHFI
Loans secured by real estate:
Construction, land development and other land	$	389	$	130	$	178	$	697	$	485,568	$	486,265
Other secured by 1-4 family residential properties		3,365		1,137		943		5,445		579,536		584,981
Secured by nonfarm, nonresidential properties		1,583		1,048		283		2,914		2,572,508		2,575,422
Other real estate secured		155		—		354		509		838,064		838,573
Other loans secured by real estate:
Other construction		3		—		—		3		650,121		650,124
Secured by 1-4 family residential properties		2,822		3,335		4,324		10,481		1,256,603		1,267,084
Commercial and industrial loans		1,595		327		1,543		3,465		1,473,312		1,476,777
Consumer loans		1,608		302		297		2,207		171,471		173,678
State and other political subdivision loans		—		—		4,079		4,079		934,558		938,637
Other commercial loans		454		69		480		1,003		575,376		576,379
Total	$	11,974	$	6,348	$	12,481	$	30,803	$	9,537,117	$	9,567,920

The following table provides an aging analysis of past due and nonaccrual LHFI by loan class at December 31, 2019 ($ in thousands):

	December 31, 2019
	Past Due
	30-59 Days		60-89 Days		90 Days or More (1)		Total		Nonaccrual		Current Loans		Total LHFI
Loans secured by real estate:
Construction, land development and other    land	$	380	$	256	$	—	$	636	$	897	$	1,161,258	$	1,162,791
Secured by 1-4 family residential properties		5,254		940		211		6,405		16,810		1,832,698		1,855,913
Secured by nonfarm, nonresidential    properties		1,698		—		—		1,698		7,700		2,465,847		2,475,245
Other real estate secured		8		—		—		8		1,032		723,440		724,480
Commercial and industrial loans		617		12		39		668		21,775		1,455,453		1,477,896
Consumer loans		2,208		380		392		2,980		108		172,650		175,738
State and other political subdivision loans		76		—		—		76		4,079		963,789		967,944
Other loans		152		4		—		156		825		494,640		495,621
Total	$	10,393	$	1,592	$	642	$	12,627	$	53,226	$	9,269,775	$	9,335,628

(1) Past due 90 days or more but still accruing interest.

Impaired LHFI

Prior to the adoption of FASB ASC Topic 326, Trustmark’s individually evaluated impaired LHFI included all commercial nonaccrual relationships of $500 thousand or more, which were specifically reviewed for impairment and deemed impaired, and all LHFI classified as TDRs in accordance with FASB ASC Subtopic 310-10-50-20 “Impaired Loans.”  Once a LHFI was deemed to be impaired, the full difference between book value and the most likely estimate of the collateral’s net realizable value was charged off or a specific reserve was established.

No material interest income was recognized in the income statement on impaired LHFI for the period ended March 31, 2019.

At December 31, 2019, individually evaluated impaired LHFI consisted of the following ($ in thousands):

	December 31, 2019
	LHFI
	Unpaid Principal Balance		With No Related Allowance Recorded		With an Allowance Recorded		Total Recorded Investment		Related Allowance		Average Recorded Investment
Loans secured by real estate:
Construction, land development and other land	$	926	$	610	$	16	$	626	$	—	$	1,089
Secured by 1-4 family residential properties		6,513		2,104		3,360		5,464		35		4,713
Secured by nonfarm, nonresidential properties		7,295		1,462		5,255		6,717		2,355		8,096
Other real estate secured		69		—		68		68		—		158
Commercial and industrial loans		27,178		19,374		4,084		23,458		707		27,088
Consumer loans		22		—		21		21		—		11
State and other political subdivision loans		4,079		—		4,079		4,079		1,809		6,337
Other loans		1,207		—		784		784		553		1,033
Total	$	47,289	$	23,550	$	17,667	$	41,217	$	5,459	$	48,525

Troubled Debt Restructurings

A TDR occurs when a borrower is experiencing financial difficulties, and for related economic or legal reasons, a concession is granted to the borrower that Trustmark would not otherwise consider.  Whatever the form of concession that might be granted by Trustmark, Management’s objective is to enhance collectibility by obtaining more cash or other value from the borrower or by increasing the probability of receipt by granting the concession than by not granting it.  Other concessions may arise from court proceedings or may be imposed by law.  In addition, TDRs also include those credits that are extended or renewed to a borrower who is not able to obtain funds from sources other than Trustmark at a market interest rate for new debt with similar risk.

At March 31, 2020 and 2019, LHFI classified as TDRs totaled $26.5 million and $30.2 million, respectively, and were primarily comprised of credits with interest-only payments for an extended period of time and credits renewed at a rate that was not commensurate with that of new debt with similar risk which totaled $18.3 million and $24.8 million at March 31, 2020 and 2019, respectively.  The remaining TDRs at March 31, 2020 and 2019 resulted from bankruptcies or from payment or maturity extensions.  Trustmark had $10.7 million of unused commitments on TDRs at March 31, 2020 compared to $4.4 million of unused commitments on TDRs at March 31, 2019.  

At March 31, 2020, TDRs had a related ACL of $210 thousand, compared to a related allowance for loan loss of $2.8 million at March 31, 2019, and resulted in charge-offs of $2.2 million and $43 thousand for the three months ended March 31, 2020 and 2019, respectively.

The following table illustrates the impact of modifications classified as TDRs for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020						2019
	Number of Contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of Contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
Loans secured by real estate:
Other secured by 1-4 family residential    properties		5	$	501	$	501		2	$	86	$	86
Commercial and industrial loans		2		1,582		1,582		6		9,054		9,054
Consumer loans		4		20		20		2		30		30
Total		11	$	2,103	$	2,103		10	$	9,170	$	9,170

The table below includes the balances at default for TDRs modified within the last 12 months for which there was a payment default during the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020				2019
	Number of Contracts		Recorded Investment		Number of Contracts		Recorded Investment
Loans secured by real estate:
Construction, land development and other land		—	$	—		1	$	22
Other secured by 1-4 family residential properties		3		446		3		684
Commercial and industrial loans		3		194		6		15,178
Consumer loans		—		—		2		28
Total		6	$	640		12	$	15,912

Trustmark’s TDRs have resulted primarily from allowing the borrower to pay interest-only for an extended period of time and credits renewed at a rate that was not commensurate with that of new debt with similar risk rather than from forgiveness.  Accordingly, as shown above, these TDRs have a similar recorded investment for both the pre-modification and post-modification disclosure.  Trustmark has utilized loans 90 days or more past due to define payment default in determining TDRs that have subsequently defaulted.

The following tables detail LHFI classified as TDRs by loan class at March 31, 2020 and 2019 ($ in thousands):

	March 31, 2020
	Accruing		Nonaccrual		Total
Loans secured by real estate:
Construction, land development and other land	$	—	$	14	$	14
Other secured by 1-4 family residential properties		—		3,672		3,672
Secured by nonfarm, nonresidential properties		—		2,899		2,899
Commercial and industrial loans		2,640		17,103		19,743
Consumer loans		17		23		40
Other commercial loans		—		125		125
Total TDRs	$	2,657	$	23,836	$	26,493

	March 31, 2019
	Accruing		Nonaccrual		Total
Loans secured by real estate:
Construction, land development and other land	$	—	$	22	$	22
Secured by 1-4 family residential properties		58		3,098		3,156
Secured by nonfarm, nonresidential properties		—		339		339
Commercial and industrial loans		13,786		12,380		26,166
Consumer loans		—		31		31
Other loans		—		518		518
Total TDRs	$	13,844	$	16,388	$	30,232

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act), a stimulus package intended to provide relief to businesses and consumers in the United States struggling as a result of the pandemic, was signed into law. Section 4013 of the CARES Act also addressed COVID-19- related modifications and specified that COVID-19- related modifications executed between March 1, 2020 and the earlier of (i) 60 days after the date of termination of the national emergency declared by the President and (ii) December 31, 2020, on loans that were current as of December 31, 2019 are not TDRs. Additionally, under guidance from the federal banking agencies, other short-term modifications made on a good faith basis in response to COVID-19 to borrowers who were current prior to any relief are not TDRs under ASC Subtopic 310-40. These modifications include short-term (e.g., up to six months) modifications such as payment deferrals, fee waivers, extensions of repayment terms, or delays in payment that are insignificant.  Borrowers considered current are those that are less than 30 days past due on their contractual payments at the time a modification program is implemented.  Trustmark modified 503 individual loans with aggregate principal balances totaling $344.3 million through March 31, 2020 without treating such modifications as TDRs.  Commercial concessions were primarily either interest only for 90 days or full payment deferrals for 90 days.  Consumer concessions were 90-day full payment deferrals.

Collateral-Dependent Loans

The following table presents the amortized cost basis of collateral-dependent loans by class of loans and collateral type as of March 31, 2020 ($ in thousands):

	March 31, 2020
	Real Estate		Equipment and Machinery		Inventory and Receivables		Vehicles		Miscellaneous		Total
Loans secured by real estate:
Construction, land development and    other land	$	1,804	$	—	$	—	$	—	$	—	$	1,804
Other secured by 1-4 family    residential properties		519		—		—		—		—		519
Secured by nonfarm, nonresidential    properties		12,054		—		—		—		—		12,054
Other real estate secured		65		—		—		—		—		65
Other loans secured by real estate:												—
Other construction		—		—		—		—		—		—
Secured by 1-4 family residential    properties		1,504		—		—		—		—		1,504
Commercial and industrial loans		115		873		8,970		221		8,888		19,067
Consumer loans		—		—		—		—		—		—
State and other political subdivision loans		4,079		—		—		—		—		4,079
Other commercial loans		623		—		—		—		125		748
Total	$	20,763	$	873	$	8,970	$	221	$	9,013	$	39,840

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, equipment and other non-real estate collateral. There have been no significant changes to the collateral that secures these financial assets during the period.

• State and other political subdivision loans – Loans within this loan class are secured by liens on real estate properties. There have been no significant changes to the collateral that secures these financial assets during the period.

• Other loans - Loans within this loan class are secured by liens on real estate properties or priority status of a UCC agreement for non-real estate collateral. There have been no significant changes to the collateral that secures these financial assets during the period.

Credit Quality Indicators

Trustmark’s LHFI portfolio credit quality indicators focus on six key quality ratios that are compared against bank tolerances.  The loan indicators are total classified outstanding, total criticized outstanding, nonperforming loans, nonperforming assets, delinquencies and net loan losses.  Due to the homogenous nature of consumer loans, Trustmark does not assign a formal internal risk rating to each credit and therefore the criticized and classified measures are primarily composed of commercial loans.

In addition to monitoring portfolio credit quality indicators, Trustmark also measures how effectively the lending process is being managed and risks are being identified.  As part of an ongoing monitoring process, Trustmark grades the commercial portfolio segment as it relates to credit file completion and financial statement exceptions, underwriting, collateral documentation and compliance with law as shown below:

• Credit File Completeness and Financial Statement Exceptions – evaluates the quality and condition of credit files in terms of content and completeness and focuses on efforts to obtain and document sufficient information to determine the quality and status of credits.  Also included is an evaluation of the systems/procedures used to insure compliance with policy.

• Underwriting – evaluates whether credits are adequately analyzed, appropriately structured and properly approved within loan policy requirements.  A properly approved credit is approved by adequate authority in a timely manner with all conditions of approval fulfilled.  Total policy exceptions measure the level of underwriting and other policy exceptions within a portfolio segment.

• Collateral Documentation – focuses on the adequacy of documentation to perfect Trustmark’s collateral position and substantiate collateral value.  Collateral exceptions measure the level of documentation exceptions within a portfolio segment.  Collateral exceptions occur when certain collateral documentation is either not present or not current.

• Compliance with Law – focuses on underwriting, documentation, approval and reporting in compliance with banking laws and regulations.  Primary emphasis is directed to the Financial Institutions Reform, Recovery and Enforcement Act of 1989 (FIRREA), Regulation O requirements and regulations governing appraisals.

Commercial Credits

Trustmark has established a loan grading system that consists of ten individual credit risk grades (risk ratings) that encompass a range from loans where the expectation of loss is negligible to loans where loss has been established.  The model is based on the risk of default for an individual credit and establishes certain criteria to delineate the level of risk across the ten unique credit risk grades.  Credit risk grade definitions are as follows:

• Risk Rate (RR) 1 through RR 6 – Grades one through six represent groups of loans that are not subject to criticism as defined in regulatory guidance.  Loans in these groups exhibit characteristics that represent low to moderate risk measured by using a variety of credit risk criteria such as cash flow coverage, debt service coverage, balance sheet leverage, liquidity, management experience, industry position, prevailing economic conditions, support from secondary sources of repayment and other credit factors that may be relevant to a specific loan.  In general, these loans are supported by properly margined collateral and guarantees of principal parties.

• Other Assets Especially Mentioned (Special Mention) (RR 7) – a loan that has a potential weakness that if not corrected will lead to a more severe rating.  This rating is for credits that are currently protected but potentially weak because of an adverse feature or condition that if not corrected will lead to a further downgrade.

• Substandard (RR 8) – a loan that has at least one identified weakness that is well defined.  This rating is for credits where the primary sources of repayment are not viable at the time of evaluation or where either the capital or collateral is not adequate to support the loan and the secondary means of repayment do not provide a sufficient level of support to offset the identified weakness.  Loss potential exists in the aggregate amount of substandard loans but does not necessarily exist in individual loans.

• Doubtful (RR 9) – a loan with an identified weakness that does not have a valid secondary source of repayment.  Generally, these credits have an impaired primary source of repayment and secondary sources are not sufficient to prevent a loss in the credit.  The exact amount of the loss has not been determined at this time.

• Loss (RR 10) – a loan or a portion of a loan that is deemed to be uncollectible.

By definition, credit risk grades special mention (RR 7), substandard (RR 8), doubtful (RR 9) and loss (RR 10) are criticized loans while substandard (RR 8), doubtful (RR 9) and loss (RR 10) are classified loans.  These definitions are standardized by all bank regulatory agencies and are generally equally applied to each individual lending institution.  The remaining credit risk grades are considered pass credits and are solely defined by Trustmark.

To enhance this process, Trustmark has determined that loans will be individually assessed, and a formal analysis will be performed and based upon the analysis the loan will be written down to net realizable value.  Trustmark will individually assess and remove loans from the pool in the following circumstances:

• Commercial nonaccrual loans with total exposure of $500 thousand (excluding those portions of the debt that are government guaranteed or are secured by Trustmark deposits or marketable securities) or more.  

• Commercial accruing substandard loans with total exposure of $1.0 million (excluding those portions of the debt that are government guaranteed or are secured by Trustmark deposits or marketable securities) or more will be reviewed on an individual basis to determine if the risk characteristics of the loan are indictive of the rest of the loan pool.  Any loan that is believed to not share similar risk characteristics with the rest of the pool will be individually assessed.  Otherwise, the loan will be left within the pool based on the results of the assessment.

• Commercial accruing loans deemed to be a TDR with total exposure of $500 thousand (excluding those portions of the debt that are government guaranteed or are secured by Trustmark deposits or marketable securities) or more.  If the loan is believed to not share similar risk characteristics with the rest of the loan pool, the loan will be individually assessed.  Otherwise, the loan will be left within the pool and monitored on an ongoing basis.

Each loan officer assesses the appropriateness of the internal risk rating assigned to their credits on an ongoing basis.  Trustmark’s Asset Review area conducts independent credit quality reviews of the majority of Trustmark’s commercial loan portfolio both on the underlying credit quality of each individual loan class as well as the adherence to Trustmark’s loan policy and the loan administration process.  In general, Asset Review conducts reviews of each lending area within a six- to eighteen-month window depending on the overall credit quality results of the individual area.

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 thirty days or more or on nonaccrual.  This review includes recommendations regarding risk ratings, accrual status, charge-offs and appropriate servicing officer as well as evaluation of problem credits for determination of TDRs.  Quarterly, the Credit Quality Review Committee reviews and modifies continuous action plans for all credits risk rated seven or worse for relationships of $100 thousand or more.

In addition, a semi-annual review of significant development, commercial construction, multi-family and nonowner-occupied projects is performed.  This review assesses each particular project with respect to location, project valuations, progress of completion, leasing status, current financial information, rents, operating expenses, cash flow, adherence to budget and projections and other information as applicable.  Summary results are reviewed by Senior and Regional Credit Officers in addition to the Chief Credit Officer with a determination made as to the appropriateness of existing risk ratings and accrual status.

Consumer Credits

Consumer LHFI that do not meet a minimum custom credit score are reviewed quarterly by Management.  The Retail Credit Review Committee reviews the volume and percentage of approvals that did not meet the minimum passing custom score by region, individual location, and officer to ensure that Trustmark continues to originate quality loans. 

Trustmark monitors the levels and severity of past due consumer LHFI on a daily basis through its collection activities.  A detailed assessment of consumer LHFI delinquencies is performed monthly at both a product and market level by delivery channel, which incorporates the perceived level of risk at time of underwriting. 

The tables below present the amortized cost basis of loans by credit quality indicator and class of loans based on the most recent analysis performed ($ in thousands):

	Term Loans by Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Total
As of March 31, 2020	Commercial LHFI
Loans secured by real estate:
Construction, land development    and other land:
Pass - RR 1 through RR 6	$	77,319	$	223,340	$	54,232	$	7,319	$	4,228	$	6,771	$	36,843	$	410,052
Special Mention - RR 7		—		—		—		—		—		—		—		—
Substandard - RR 8		1,299		1,190		423		39		680		45		—		3,676
Doubtful - RR 9		—		—		—		—		—		42		—		42
Total		78,618		224,530		54,655		7,358		4,908		6,858		36,843		413,770
Other secured by 1-4 family residential    properties:
Pass - RR 1 through RR 6	$	7,746	$	32,807	$	25,192	$	13,745	$	14,504	$	10,639	$	11,512	$	116,145
Special Mention - RR 7		—		92		—		—		—		—		—		92
Substandard - RR 8		284		4,016		1,119		244		486		849		114		7,112
Doubtful - RR 9		—		37		—		—		—		—		—		37
Total		8,030		36,952		26,311		13,989		14,990		11,488		11,626		123,386
Secured by nonfarm, nonresidential    properties:
Pass - RR 1 through RR 6	$	132,966	$	542,615	$	495,056	$	407,125	$	350,006	$	474,906	$	118,137	$	2,520,811
Special Mention - RR 7		—		740		—		—		—		4,826		—		5,566
Substandard - RR 8		4,148		14,888		1,859		4,587		9,202		12,885		1,053		48,622
Doubtful - RR 9		60		—		—		—		—		341		—		401
Total		137,174		558,243		496,915		411,712		359,208		492,958		119,190		2,575,400
Other real estate secured:
Pass - RR 1 through RR 6	$	18,032	$	180,641	$	269,166	$	177,386	$	136,620	$	40,741	$	12,561	$	835,147
Special Mention - RR 7		—		—		—		—		—		—		—		—
Substandard - RR 8		—		197		1,304		—		398		843		—		2,742
Doubtful - RR 9		—		—		—		—		—		—		—		—
Total		18,032		180,838		270,470		177,386		137,018		41,584		12,561		837,889

	Term Loans by Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Total
As of March 31, 2020	Commercial LHFI
Other loans secured by real estate:
Other construction
Pass - RR 1 through RR 6	$	20,369	$	359,717	$	203,819	$	24,199	$	23,154	$	—	$	4,645	$	635,903
Special Mention - RR 7		—		—		—		—		—		—		—		—
Substandard - RR 8		—		—		14,221		—		—		—		—		14,221
Doubtful - RR 9		—		—		—		—		—		—		—		—
Total		20,369		359,717		218,040		24,199		23,154		—		4,645		650,124
Commercial and industrial loans:
Pass - RR 1 through RR 6	$	175,477	$	294,301	$	146,947	$	115,358	$	85,992	$	59,924	$	540,814	$	1,418,813
Special Mention - RR 7		—		—		—		—		—		—		—		—
Substandard - RR 8		8,103		2,336		19,042		864		724		2,641		23,416		57,126
Doubtful - RR 9		17		540		—		—		269		4		8		838
Total		183,597		297,177		165,989		116,222		86,985		62,569		564,238		1,476,777
State and other political subdivision loans:
Pass - RR 1 through RR 6	$	30,645	$	134,410	$	76,100	$	124,088	$	147,560	$	415,156	$	805	$	928,764
Special Mention - RR 7		—		—		—		—		—		4,650		—		4,650
Substandard - RR 8		—		—		—		384		—		4,839		—		5,223
Doubtful - RR 9		—		—		—		—		—		—		—		—
Total		30,645		134,410		76,100		124,472		147,560		424,645		805		938,637
Other commercial loans:
Pass - RR 1 through RR 6	$	37,485	$	90,436	$	35,815	$	15,742	$	58,816	$	55,347	$	267,500	$	561,141
Special Mention - RR 7		—		2,028		—		—		—		—		2,995		5,023
Substandard - RR 8		—		299		698		94		1,265		—		7,747		10,103
Doubtful - RR 9		—		89		—		—		—		23		—		112
Total		37,485		92,852		36,513		15,836		60,081		55,370		278,242		576,379
Total commercial LHFI	$	513,950	$	1,884,719	$	1,344,993	$	891,174	$	833,904	$	1,095,472	$	1,028,150	$	7,592,362

	Term Loans by Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Total
As of March 31, 2020	Consumer LHFI
Loans secured by real estate:
Construction, land development and    other land:
Current	$	4,470	$	44,148	$	14,499	$	2,531	$	1,992	$	4,557	$	—	$	72,197
Past due 30-89 days		—		—		64		52		29		43		—		188
Past due 90 days or more		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		110		—		110
Total		4,470		44,148		14,563		2,583		2,021		4,710		—		72,495
Other secured by 1-4 family residential    properties:
Current	$	5,636	$	24,558	$	17,083	$	5,225	$	2,833	$	17,902	$	380,934	$	454,171
Past due 30-89 days		—		166		111		30		58		1,384		1,870		3,619
Past due 90 days or more		—		5		—		—		—		2		34		41
Nonaccrual		83		38		211		448		—		678		2,306		3,764
Total		5,719		24,767		17,405		5,703		2,891		19,966		385,144		461,595
Secured by nonfarm, nonresidential    properties:
Current	$	—	$	—	$	—	$	—	$	—	$	16	$	—	$	16
Past due 30-89 days		—		—		—		6		—		—		—		6
Past due 90 days or more		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		—		—		—
Total		—		—		—		6		—		16		—		22
Other real estate secured:
Current	$	60	$	—	$	47	$	47	$	111	$	419	$	—	$	684
Past due 30-89 days		—		—		—		—		—		—		—		—
Past due 90 days or more		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		—		—		—
Total		60		—		47		47		111		419		—		684

	Term Loans by Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Total
As of March 31, 2020	Consumer LHFI
Other loans secured by real estate:
Secured by 1-4 family residential properties
Current	$	42,174	$	253,904	$	251,953	$	128,603	$	140,848	$	431,984	$	—	$	1,249,466
Past due 30-89 days		—		271		2,649		123		—		1,803		—		4,846
Past due 90 days or more		—		96		148		—		—		61		—		305
Nonaccrual		—		630		2,252		788		249		8,548		—		12,467
Total		42,174		254,901		257,002		129,514		141,097		442,396		—		1,267,084
Consumer loans:
Current	$	23,790	$	53,753	$	25,875	$	10,148	$	2,751	$	1,390	$	53,694	$	171,401
Past due 30-89 days		425		469		313		89		31		9		561		1,897
Past due 90 days or more		21		12		11		—		—		—		252		296
Nonaccrual		—		17		28		27		4		8		—		84
Total		24,236		54,251		26,227		10,264		2,786		1,407		54,507		173,678
Total consumer LHFI	$	76,659	$	378,067	$	315,244	$	148,117	$	148,906	$	468,914	$	439,651	$	1,975,558
Total LHFI	$	590,609	$	2,262,786	$	1,660,237	$	1,039,291	$	982,810	$	1,564,386	$	1,467,801	$	9,567,920

The table below presents LHFI by loan class and credit quality indicator at  December 31, 2019 ($ in thousands):

	December 31, 2019
		Commercial LHFI
		Pass - Categories 1-6		Special Mention - Category 7		Substandard - Category 8		Doubtful - Category 9		Subtotal
Loans secured by real estate:
Construction, land development and other    land		$	1,075,146	$	—	$	15,726	$	42	$	1,090,914
Secured by 1-4 family residential    properties			116,592		45		6,355		41		123,033
Secured by nonfarm, nonresidential    properties			2,430,761		—		44,001		328		2,475,090
Other real estate secured			721,238		—		2,547		—		723,785
Commercial and industrial loans			1,407,837		909		68,262		888		1,477,896
Consumer loans			—		—		—		—		—
State and other political subdivision loans			957,948		4,650		5,346		—		967,944
Other loans			469,095		3,445		16,926		30		489,496
Total		$	7,178,617	$	9,049	$	159,163	$	1,329	$	7,348,158

	Consumer LHFI
	Current		Past Due 30-89 Days		Past Due 90 Days or More		Nonaccrual		Subtotal		Total LHFI
Loans secured by real estate:
Construction, land development and other    land	$	71,413	$	332	$	—	$	132	$	71,877	$	1,162,791
Secured by 1-4 family residential    properties		1,710,930		5,922		211		15,817		1,732,880		1,855,913
Secured by nonfarm, nonresidential    properties		155		—		—		—		155		2,475,245
Other real estate secured		695		—		—		—		695		724,480
Commercial and industrial loans		—		—		—		—		—		1,477,896
Consumer loans		172,649		2,588		393		108		175,738		175,738
State and other political subdivision loans		—		—		—		—		—		967,944
Other loans		6,125		—		—		—		6,125		495,621
Total	$	1,961,967	$	8,842	$	604	$	16,057	$	1,987,470	$	9,335,628

Past Due LHFS

LHFS past due 90 days or more totaled $43.6 million and $41.6 million at March 31, 2020 and December 31, 2019, respectively.  LHFS past due 90 days or more are serviced loans eligible for repurchase, which are fully guaranteed by the Government National Mortgage Association (GNMA).  GNMA optional repurchase programs allow financial institutions to buy back individual delinquent mortgage loans that meet certain criteria from the securitized loan pool for which the institution provides servicing.  At the servicer’s option and without GNMA’s prior authorization, the servicer may repurchase such a delinquent loan for an amount equal to 100% of the remaining principal balance of the loan.  This buy-back option is considered a conditional option until the delinquency criteria are met, at which time the option becomes unconditional.  When Trustmark is deemed to have regained effective control over these loans under the unconditional buy-back option, the loans can no longer be reported as sold and must be brought back onto the balance sheet as loans held for sale, regardless of whether Trustmark intends to exercise the buy-back option.  These loans are reported as held for sale with the offsetting liability being reported as short-term borrowings.

Trustmark did not exercise its buy-back option on any delinquent loans serviced for GNMA during the first three months of 2020 or 2019.

Allowance for Credit Losses, LHFI (ACL)

Trustmark’s ACL methodology for LHFI is based upon guidance within FASB ASC Subtopic 326-20 as well as regulatory guidance from its primary regulator.  The ACL is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans.  Credit quality within the LHFI portfolio is continuously monitored by Management and is reflected within the ACL for loans.  The ACL is an estimate of expected losses inherent within Trustmark’s existing LHFI portfolio.  The ACL for LHFI is adjusted through the provision for credit losses (PCL) and reduced by the charge off of loan amounts, net of recoveries.  

The loan loss estimation process involves procedures to appropriately consider the unique characteristics of Trustmark’s LHFI portfolio segments.  These segments are further disaggregated into loan classes, the level at which credit risk is monitored.  When computing allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history, delinquency status and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future.  Evaluations of the portfolio and individual credits are inherently subjective, as they require estimates, assumptions and judgments as to the facts and circumstances of particular situations.  Determining the appropriateness of the allowance is complex and requires judgement by Management about the effect of matters that are inherently uncertain.  In future periods, evaluations of the overall LHFI portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and credit loss expense.

Trustmark estimates the ACL using relevant available information, from internal and external sources, relating to past events, current conditions and reasonable and supportable forecasts including the COVID-19 pandemic effects.  Trustmark uses a third-party software application to calculate the quantitative portion of the ACL using a methodology and assumptions specific to each loan pool.  The qualitative portion of the allowance is based on general economic conditions and other internal and external factors affecting Trustmark as a whole as well as specific LHFI.  Factors considered include the following:  lending policies and procedures, economic

conditions and concentrations of credit, nature and volume of the portfolio, performance trends, and external factors.  The quantitative and qualitative portions of the allowance are added together to determine the total allowance for credit losses, which reflects Management’s expectations of future conditions based on reasonable and supportable forecasts.

The methodology for estimating the amount of expected credit losses reported in the ACL has two basic components: a collective, or pooled, component for estimated expected credit losses for pools of loans that share similar risk characteristics, and an asset-specific component involving individual loans that do not share risk characteristics with other loans and the measurement of expected credit losses for such individual loans.  In estimating the allowance for credit losses for the collective component, loans are segregated into loan pools based on loan product types and similar risk characteristics.

The loans secured by real estate and other loans secured by real estate portfolio segments include loans for both commercial and residential properties.  The underwriting process for these loans includes analysis of the financial position and strength of both the borrower and guarantor, experience with similar projects in the past, market demand and prospects for successful completion of the proposed project within the established budget and schedule, values of underlying collateral, availability of permanent financing, maximum loan-to-value ratios, minimum equity requirements, acceptable amortization periods and minimum debt service coverage requirements, based on property type.  The borrower’s financial strength and capacity to repay their obligations remain the primary focus of underwriting.  Financial strength is evaluated based upon analytical tools that consider historical and projected cash flows and performance in addition to analysis of the proposed project for income-producing properties.  Additional support offered by guarantors is also considered.  Ultimate repayment of these loans is sensitive to interest rate changes, general economic conditions, liquidity and availability of long-term financing.

The commercial and industrial LHFI portfolio segment includes commercial loans 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, equipment and fixed asset purchases that are secured by those assets and term financing for those within Trustmark’s geographic markets.  Trustmark’s credit underwriting process for commercial and industrial loans includes analysis of historical and projected cash flows and performance, evaluation of financial strength of both borrowers and guarantors as reflected in current and detailed financial information and evaluation of underlying collateral to support the credit.

The consumer LHFI portfolio segment is comprised of loans which are underwritten after evaluating a borrower’s capacity, credit and collateral.  Several factors are considered when assessing a borrower’s capacity, including the borrower’s employment, income, current debt, assets and level of equity in the property.  Credit is assessed using a credit report that provides credit scores and the borrower’s current and past information about their credit history.  Property appraisals are obtained to assist in evaluating collateral.  Loan-to-value and debt-to-income ratios, loan amount and lien position are also considered in assessing whether to originate a loan.  These borrowers are particularly susceptible to downturns in economic trends such as conditions that negatively affect housing prices and demand and levels of unemployment.

The state and other political subdivision LHFI and the other commercial LHFI portfolio segments primarily consist of loans to non-depository financial institutions, such as mortgage companies, finance companies and other financial intermediaries, loans to state and political subdivisions, and loans to non-profit and charitable organizations.  These loans are underwritten based on the specific nature or purpose of the loan and underlying collateral with special consideration given to the specific source of repayment for the loan.

The following table provides a description of each of Trustmark’s portfolio segments, loan classes, loan pools and the ACL methodology and loss drivers:

Portfolio Segment	Loan Class	Loan Pool	Methodology	Loss Drivers
Loans secured by real estate	Construction, land    development and other land	1-4 family residential    construction	DCF	Prime Rate, National GDP
		Lots and development	DCF	Prime Rate, Southern Unemployment
		Unimproved land	DCF	Prime Rate, Southern Unemployment
	Other secured by 1-4    family residential    properties	Consumer 1-4 family - 1st liens	DCF	Prime Rate, Southern Unemployment
	Secured by nonfarm,    nonresidential properties	Nonowner-occupied -    hotel/motel	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied - office	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied- Retail	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied - senior    living/nursing homes	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied -    all other	DCF	Southern Vacancy Rate, Southern Unemployment
	Other real estate secured	Nonresidential nonowner    -occupied - apartments	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonresidential owner-occupied	DCF	Southern Unemployment, National GDP
Other loans secured by    real estate	Other construction	Other construction	WARM	Prime Rate, National Unemployment
	Secured by 1-4 family    residential properties	Trustmark mortgage	WARM	Southern Unemployment
Commercial and    industrial loans	Commercial and    industrial loans	Commercial and industrial -    non-working capital	DCF	Trustmark historical data
		Commercial and industrial -    working capital	DCF	Trustmark historical data
Consumer loans	Consumer loans	Credit cards	WARM	Trustmark call report data
		Overdrafts	Loss Rate	Trustmark historical data
		All other consumer	DCF	Prime Rate, Southern Unemployment
State and other political    subdivision loans	State and other political    subdivision loans	Obligations of state and    political subdivisions	DCF	Moody's Bond Default Study
Other commercial loans	Other commercial loans	Other loans	DCF	Prime Rate, Southern Unemployment

In general, Trustmark utilizes a DCF method to estimate the quantitative portion of the allowance for credit losses for loan pools.  The DCF model consists of two key components, a loss driver analysis (LDA) and a cash flow analysis.  For loan pools utilizing the DCF methodology, multiple assumptions are in place, depending on the loan pool.  A reasonable and supportable forecast is utilized for each loan pool by developing a LDA for each loan class.  The LDA uses charge off data from Federal Financial Institutions Examination Council (FFIEC) reports to construct a periodic default rate (PDR).  The PDR is decomposed into a probability of default (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 loss given default (LGD) is derived using a method referred to as Frye Jacobs.  The Frye Jacobs method is a mathematical formula that traces the relationship between LGD and PD over time and projects the LGD based on the levels of PD forecasts. This model approach is applicable to all pools within the construction, land development and other land, other secured by 1-4 family residential properties, secured by nonfarm, nonresidential properties and other real estate secured loan classes as well as the all other consumer and other loans pools.

For the commercial and industrial loans related pools, Trustmark uses its own PD and LGD data, instead of the macroeconomic variables and the Frye Jacobs method described above, to calculate the PD and LGD as there were no defensible macroeconomic variables that correlated to Trustmark’s losses.  Trustmark utilizes a third-party Bond Default Study to derive the PD and LGD for the

obligations of state and political subdivisions pool.  Due to the lack of losses within this pool, no defensible macroeconomic factors were identified to correlate.

The PD and LGD measures are used in conjunction with prepayment data as inputs into the DCF model to calculate the cash flows at the individual loan level.  Contractual cash flows based on loan terms are adjusted for PD, LGD and prepayments to derive loss cash flows.  These loss cash flows are discounted by the loan’s coupon rate to arrive at the discounted cash flow based quantitative loss.  The prepayment studies are updated quarterly by a third-party for each applicable pool.

An alternate method of estimating the ACL is used for certain loan pools due to specific characteristics of these loans.  For the non-DCF pools, specifically, those using the weighted average remaining maturity (WARM) method, the remaining life is incorporated into the ACL quantitative calculation.

Trustmark determined that reasonable and supportable forecasts could be made for a twelve-month period for all of its loan pools.  To the extent the lives of the loans in the LHFI portfolio extend beyond this forecast period, Trustmark uses a reversion period of four quarters and reverts to the historical mean on a straight-line basis over the remaining life of the loans.  For the current period, the forecast related to the macroeconomic variables used in the quantitative modeling process were adversely affected due to the impact of COVID-19, causing an overall increase in reserve levels.  

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 two are currently considered active: economic conditions and concentrations of credit and performance trends.

Two of Trustmark’s largest loan classes are the loans secured by nonfarm, nonresidential properties and the loans secured by other real estate. Trustmark elected to create a qualitative factor specifically for these loan classes which addresses changes in the economic conditions of metropolitan areas and applies additional pool level reserves. This qualitative factor is based on third-party market data and forecast trends and is updated quarterly as information is available, by market and by loan pool.

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 ACL for individual loans that do not share risk characteristics with other loans is measured as the difference between the discounted value of expected future cash flows, based in the effective interest rate at origination, and the amortized cost basis of the loan, or the net realizable value.  The ACL is the difference between the loan’s net realizable value and its amortized cost basis (net of previous charge-offs and deferred loan fees and costs), except for collateral-dependent loans.  A loan is collateral dependent when the borrower is experiencing financial difficulty and repayment of the loan is expected to be provided substantially through the sale of the collateral.  The expected credit loss for collateral-dependent loans is measured as the difference between the amortized cost basis of the loan and the fair value of the collateral, adjusted for the estimated cost to sell.  Fair value estimates for collateral-dependent loans are derived from appraised values based on the current market value or the ‘as is’ value of the collateral, normally from recently received and reviewed appraisals.  Current appraisals are ordered on an annual basis based on the inspection date or more often if market conditions necessitate.  Appraisals are obtained from state-certified appraisers and are based on certain assumptions, which may include construction or development status and the highest and best use of the property.  These appraisals are reviewed by Trustmark’s Appraisal Review Department to ensure they are acceptable, and values are adjusted down for costs associated with asset disposal.  If the calculated expected credit loss is determined to be permanent or not recoverable, the amount of the expected credit loss is charged off.

LHFI are charged off against the ACL, with any subsequent recoveries credited back to the ACL account.  Expected recoveries may not exceed the aggregate of amounts previously charged off and expected to be charged off.  Trustmark’s loan policy dictates the guidelines to be followed in determining when a loan is charged off.  Commercial purpose LHFI are charged off when a determination is made that the loan is uncollectible and continuance as a bankable asset is not warranted.  Consumer LHFI secured by 1-4 family residential real estate are generally charged off or written down to the fair value of the collateral less cost to sell at no later than 180 days of delinquency.  Non-real estate consumer purpose LHFI, including both secured and unsecured loans, are generally charged off

by 120 days of delinquency.  Consumer revolving lines of credit and credit card debt are generally charged off on or prior to 180 days of delinquency.

The following table disaggregates the ACL and the amortized cost basis of the loans by the measurement methodology used at March 31, 2020 ($ in thousands):

	March 31, 2020
	ACL						LHFI
	Individually Evaluated for Credit Loss		Collectively Evaluated for Credit Loss		Total ACL		Individually Evaluated for Credit Loss		Collectively Evaluated for Credit Loss		Total LHFI
Loans secured by real estate:
Construction, land development and other land	$	—	$	9,079	$	9,079	$	1,804		484,461	$	486,265
Other secured by 1-4 family residential properties		—		11,711		11,711		519		584,462		584,981
Secured by nonfarm, nonresidential properties		—		28,127		28,127		12,054		2,563,368		2,575,422
Other real estate secured		—		5,273		5,273		65		838,508		838,573
Other loans secured by real estate:
Other construction		—		7,711		7,711		—		650,124		650,124
Secured by 1-4 family residential properties		—		8,042		8,042		1,504		1,265,580		1,267,084
Commercial and industrial loans		26		14,538		14,564		19,067		1,457,710		1,476,777
Consumer loans		—		6,596		6,596		—		173,678		173,678
State and other political subdivision loans		1,809		1,632		3,441		4,079		934,558		938,637
Other commercial loans		518		5,502		6,020		748		575,631		576,379
Total	$	2,353	$	98,211	$	100,564	$	39,840	$	9,528,080	$	9,567,920

The following table disaggregates the allowance for loan losses and LHFI balances by the impairment evaluation methodology used at December 31, 2019 ($ in thousands):

	December 31, 2019
	Allowance for Loan Losses						LHFI
	Individually Evaluated		Collectively Evaluated		Total		Individually Evaluated		Collectively Evaluated		Total
Loans secured by real estate:
Construction, land development and other land	$	—	$	8,260	$	8,260	$	626	$	1,162,165	$	1,162,791
Secured by 1-4 family residential properties		35		8,897		8,932		5,464		1,850,449		1,855,913
Secured by nonfarm, nonresidential properties		2,355		23,803		26,158		6,717		2,468,528		2,475,245
Other real estate secured		—		4,024		4,024		68		724,412		724,480
Commercial and industrial loans		707		25,285		25,992		23,458		1,454,438		1,477,896
Consumer loans		—		3,379		3,379		21		175,717		175,738
State and other political subdivision loans		1,809		420		2,229		4,079		963,865		967,944
Other loans		553		4,750		5,303		784		494,837		495,621
Total	$	5,459	$	78,818	$	84,277	$	41,217	$	9,294,411	$	9,335,628

Changes in the ACL were as follows for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	84,277		$	79,290
FASB ASU 2016-13 adoption adjustments:
LHFI		(3,039	)		—
Allowance for loan losses, acquired loans transfer		815			—
Acquired loans ACL adjustment		1,007			—
Loans charged-off		(5,545	)		(4,033	)
Recoveries		2,468			2,137
Net (charge-offs) recoveries		(3,077	)		(1,896	)
PCL		20,581			1,611
Balance at end of period	$	100,564		$	79,005

The following table details changes in the ACL by loan class for the period presented ($ in thousands):

	2020
	Balance January 1,		FASB ASU 2016-13 Adoption Adjustment			Charge-offs			Recoveries		PCL			Balance March 31,
Loans secured by real estate:
Construction, land development and other land	$	6,371	$	(188	)	$	—		$	94	$	2,802		$	9,079
Other secured by 1-4 family residential properties		5,888		4,188			(64	)		63		1,636			11,711
Secured by nonfarm, nonresidential properties		26,158		(8,179	)		(2,448	)		61		12,535			28,127
Other real estate secured		4,024		(765	)		(8	)		6		2,016			5,273
Other loans secured by real estate:
Other construction		1,889		3,202			—			19		2,601			7,711
Secured by 1-4 family residential properties		3,044		2,891			(19	)		93		2,033			8,042
Commercial and industrial loans		25,992		(8,964	)		(982	)		542		(2,024	)		14,564
Consumer loans		3,379		2,059			(690	)		473		1,375			6,596
State and other political subdivision loans		2,229		2,455			—			—		(1,243	)		3,441
Other commercial loans		5,303		2,084			(1,334	)		1,117		(1,150	)		6,020
Total	$	84,277	$	(1,217	)	$	(5,545	)	$	2,468	$	20,581		$	100,564

The increases in the PCL for loans and other loans secured by real estate and consumer loans at March 31, 2020 when compared to the January 1, 2020 adoption adjustments were primarily due to the negative impact of COVID-19 on the macroeconomic forecasting variables used in the ACL modeling, such as National and Southern Unemployment, National GDP, Prime Rate and South Vacancy Rate.

The PCL for the commercial and industrial loan portfolio decreased an additional $2.0 million during the first quarter of 2020 when compared to the January 1, 2020 adoption adjustment primarily due to loans that had been specifically reserved for being charged down as well as a slight decrease in the calculated PD and LGD, which uses Trustmark’s historical data.  The decrease in state and other political subdivision loans of $1.2 million at March 31, 2020 was primarily due to a decrease in reserves based on routine updates to the qualitative portion of the allowance calculation.  Other commercial loans decreased $1.2 million during this same period due to a pay-off which decreased needed reserves.  

The following table details changes in the allowance for loan losses, LHFI by loan class for the period presented ($ in thousands):

	2019
	Balance January 1,		Charge-offs			Recoveries		Provision for Loan Losses			Balance March 31,
Loans secured by real estate:
Construction, land development and other land loans	$	7,390	$	(35	)	$	306	$	(137	)	$	7,524
Secured by 1-4 family residential properties		8,641		(161	)		216		(315	)		8,381
Secured by nonfarm, nonresidential properties		22,376		—			15		(912	)		21,479
Other real estate secured		3,450		—			10		(383	)		3,077
Commercial and industrial loans		27,359		(1,859	)		137		3,565			29,202
Consumer loans		2,890		(793	)		534		517			3,148
State and other political subdivision loans		990		—			—		(198	)		792
Other loans		6,194		(1,185	)		919		(526	)		5,402
Total	$	79,290	$	(4,033	)	$	2,137	$	1,611		$	79,005

XML

Acquired Loans - Schedule of Acquired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019		Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	$ 72,601
Less allowance for loan losses, acquired loans	815	[1]	$ 1,297	$ 1,231
Net acquired loans	71,786
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	4,771
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	17,525
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	38,206
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	3,946
Commercial and Industrial Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	5,035
Consumer Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	520
Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Acquired loans	$ 2,598

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

XML

Other Real Estate - Other Real Estate, By Type of Property (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Other real estate, excluding covered other real estate [Line Items]
Total other real estate	$ 24,847	$ 29,248	$ 24,847	$ 29,248	$ 32,139	$ 34,668
Construction, Land Development And Other Land Properties [Member]
Other real estate, excluding covered other real estate [Line Items]
Total other real estate	9,816	11,482
1 - 4 Family Residential Properties [Member]
Other real estate, excluding covered other real estate [Line Items]
Total other real estate	2,499	3,453
Nonfarm, Nonresidential Properties [Member]
Other real estate, excluding covered other real estate [Line Items]
Total other real estate	$ 12,532	$ 14,313

XML

Business, Basis of Financial Statement Presentation and Principles of Consolidation

3 Months Ended

Mar. 31, 2020

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 188 offices at March 31, 2020 in Alabama, Florida, Mississippi, Tennessee and Texas.  

The consolidated financial statements include the accounts of Trustmark and all other entities in which Trustmark has a controlling financial interest. All significant intercompany accounts and transactions have been eliminated in consolidation.  Certain reclassifications have been made to prior period amounts to conform to the current period presentation.  

The accompanying unaudited condensed consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X.  Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with the consolidated financial statements, and notes thereto, included in Trustmark’s Annual Report on Form 10-K for its fiscal year ended December 31, 2019 (2019 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 2020 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.

Subsequent Events

On March 11, 2020, the World Health Organization declared COVID-19, the disease caused by the novel coronavirus, a pandemic as a result of the global spread of the coronavirus illness.  The COVID-19 pandemic has adversely affected, and may continue to adversely affect economic activity globally, nationally and locally. In response to the outbreak, federal and state authorities in the United States introduced various measures to try to limit or slow the spread of the virus, including travel restrictions, nonessential business closures, stay-at-home orders, and strict social distancing. The full impact of the COVID-19 pandemic is unknown and rapidly evolving. It has caused substantial disruption in international and U.S. economies, markets, and employment. The COVID-19 pandemic may have a significant adverse impact on certain industries Trustmark serves, including restaurants and food services, hotels, retail and energy.

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act (the CARES Act), a stimulus package intended to provide relief to businesses and consumers in the United States struggling as a result of the pandemic, was signed into law. Section 4013 of the CARES Act also addressed COVID-19-related modifications and specified that COVID-19-related modifications executed between March 1, 2020 and the earlier of (i) 60 days after the date of termination of the national emergency declared by the President and (ii) December 31, 2020, on loans that were current as of December 31, 2019 are not TDRs. Additionally, under guidance from the federal banking agencies, other short-term modifications made on a good faith basis in response to COVID-19 to borrowers who were current prior to any relief are not TDRs under ASC Subtopic 310-40. These modifications include short-term (e.g., up to six months) modifications such as payment deferrals, fee waivers, extensions of repayment terms, or delays in payment that are insignificant.  Borrowers considered current are those that are less than 30 days past due on their contractual payments at the time a modification program is implemented.  Through April 23, 2020, Trustmark modified 1,978 individual loans with aggregate principal balances totaling $976.2 million. More of these types of modifications are likely to be executed in the second quarter of 2020. Commercial concessions were primarily either interest only for 90 days or full payment deferrals for 90 days.  Consumer concessions were 90-day full payment deferrals.

Because of the significant uncertainties related to the ultimate duration of the COVID-19 pandemic and its potential effects on customers and prospects, and on the national and local economy as a whole, there can be no assurances as to how the crisis may ultimately affect Trustmark’s loan portfolio.  It is unknown how long the adverse conditions associated with the COVID-19 pandemic will last and what the complete financial effect will be to Trustmark.  It is reasonably possible that estimates made in the financial statements could be materially and adversely impacted in the near term as a result of these conditions, including expected credit losses on loans and off-balance sheet credit exposures.  

XML

Leases - Cash Payments Included in Measurement of Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finance leases
Operating cash flows included in operating activities	$ 67	$ 265
Financing cash flows included in payments under finance lease obligations	459	513
Operating leases
Operating cash flows (fixed payments) included in other operating activities, net	1,246	1,246
Operating cash flows (liability reduction) included in other operating activities, net	$ 970	$ 941

XML

Acquired Loans - Acquired Loans by Loan Class and Credit Quality Indicator (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	$ 71,786
Acquired Loans, Aging [Abstract]
Current	70,305
Acquired Loans, Past Due	2,296
Nonaccrual	0	[1]
Total Acquired Loans	72,601
Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	1,307	[2]
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current	4,639
Acquired Loans, Past Due	132
Nonaccrual	0	[1]
Total Acquired Loans	4,771
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	38	[2]
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current	16,332
Acquired Loans, Past Due	1,193
Nonaccrual	0	[1]
Total Acquired Loans	17,525
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	366	[2]
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current	37,319
Acquired Loans, Past Due	887
Nonaccrual	0	[1]
Total Acquired Loans	38,206
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	851	[2]
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current	3,893
Acquired Loans, Past Due	53
Nonaccrual	0	[1]
Total Acquired Loans	3,946
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	52	[2]
Commercial and Industrial Loans [Member]
Acquired Loans, Aging [Abstract]
Current	5,035
Acquired Loans, Past Due	0
Nonaccrual	0	[1]
Total Acquired Loans	5,035
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0	[2]
Consumer Loans [Member]
Acquired Loans, Aging [Abstract]
Current	489
Acquired Loans, Past Due	31
Nonaccrual	0	[1]
Total Acquired Loans	520
Consumer Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0	[2]
Other Loans [Member]
Acquired Loans, Aging [Abstract]
Current	2,598
Acquired Loans, Past Due	0
Nonaccrual	0	[1]
Total Acquired Loans	2,598
Other Loans [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	0	[2]
Commercial LHFI [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	57,785
Commercial LHFI [Member] | Pass Categories 1-6 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	44,922
Commercial LHFI [Member] | Special Mention Category 7 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	42
Commercial LHFI [Member] | Substandard Category 8 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	10,819
Commercial LHFI [Member] | Doubtful Category 9 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	2,002
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	4,214
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Pass Categories 1-6 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	4,022
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Substandard Category 8 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	192
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	3,786
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Pass Categories 1-6 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	3,164
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Special Mention Category 7 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	42
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Substandard Category 8 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	580
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	38,206
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Pass Categories 1-6 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	27,848
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Substandard Category 8 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	9,972
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Doubtful Category 9 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	386
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	3,946
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Pass Categories 1-6 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	3,878
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Substandard Category 8 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	68
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Doubtful Category 9 [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	0
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	5,035
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Pass Categories 1-6 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	3,419
Commercial LHFI [Member] | Commercial and Industrial Loans [Member] | Doubtful Category 9 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	1,616
Commercial LHFI [Member] | Other Loans [Member] | Commercial Loan [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	2,598
Commercial LHFI [Member] | Other Loans [Member] | Pass Categories 1-6 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	2,591
Commercial LHFI [Member] | Other Loans [Member] | Substandard Category 8 [Member]
Acquired Loans, Commercial Loans [Abstract]
Acquired loans	7
Consumer LHFI [Member]
Acquired Loans, Aging [Abstract]
Current	13,795
Subtotal	14,816
Total Acquired Loans	72,601
Consumer LHFI [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	740
Consumer LHFI [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	281
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current	463
Subtotal	557
Total Acquired Loans	4,771
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	94
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Current	12,843
Subtotal	13,739
Total Acquired Loans	17,525
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	615
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	281
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Total Acquired Loans	38,206
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Acquired Loans, Aging [Abstract]
Total Acquired Loans	3,946
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]
Acquired Loans, Aging [Abstract]
Total Acquired Loans	5,035
Consumer LHFI [Member] | Consumer Loans [Member]
Acquired Loans, Aging [Abstract]
Current	489
Subtotal	520
Total Acquired Loans	520
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]
Acquired Loans, Aging [Abstract]
Acquired Loans, Past Due	31
Consumer LHFI [Member] | Other Loans [Member]
Acquired Loans, Aging [Abstract]
Total Acquired Loans	$ 2,598

[1] Acquired loans not accounted for under FASB ASC Subtopic 310-30.

[2] Past due 90 days or more but still accruing interest.

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2020	Apr. 30, 2020
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		63,420,866
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2020
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

XML

Mortgage Banking - Schedule of Mortgage Loans Sold and Serviced for Others (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	$ 7,156,704	$ 7,157,234
Federal National Mortgage Association [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	4,383,261	4,411,914
Government National Mortgage Association [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	2,685,304	2,652,782
Federal Home Loan Mortgage Corporation [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	69,389	73,134
Other [Member]
Mortgage Loans On Real Estate [Line Items]
Total mortgage loans sold and serviced for others	$ 18,750	$ 19,404

XML

Securities Sold Under Repurchase Agreement - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Securities sold under repurchase agreements, secured by securities carrying amount	$ 100.6	$ 105.6

XML

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income per consolidated statements of income	$ 22,218	$ 33,339
Net unrealized gains (losses) on available for sale securities and transferred securities:
Net unrealized holding gains (losses) arising during the period	30,380	14,118
Change in net unrealized holding loss on securities transferred to held to maturity	646	560
Reclassification adjustments for changes realized in net income:
Net change in prior service costs	28	47
Recognized net loss due to lump sum settlement	0	24
Change in net actuarial loss	244	190
Derivatives:
Change in the accumulated gain (loss) on effective cash flow hedge derivatives	0	(47)
Reclassification adjustment for (gain) loss realized in net income	0	(128)
Other comprehensive income (loss), net of tax	31,298	14,764
Comprehensive income	$ 53,516	$ 48,103

XML

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Aging Analysis of Past Due and Nonaccrual LHFI by Loan Type (Details) - USD ($) $ in Thousands		Mar. 31, 2020		Dec. 31, 2019
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		$ 30,803		$ 12,627
Nonaccrual		52,992		53,226
Current Loans		9,537,117		9,269,775
Total LHFI	[1]	9,567,920		9,335,628
Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		11,974		10,393
Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		6,348	[2]	1,592
Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		12,481		642	[2]
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		697		636
Nonaccrual		950		897
Current Loans		485,568		1,161,258
Total LHFI		486,265		1,162,791
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		389		380
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		130	[2]	256
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		178
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		5,445
Nonaccrual		4,991
Current Loans		579,536
Total LHFI		584,981
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		3,365
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	[2]	1,137
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		943
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due				6,405
Nonaccrual				16,810
Current Loans				1,832,698
Total LHFI				1,855,913
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due				5,254
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due				940
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	[2]			211
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		10,481
Nonaccrual		12,466
Current Loans		1,256,603
Total LHFI		1,267,084
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		2,822
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	[2]	3,335
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		4,324
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		2,914		1,698
Nonaccrual		7,323		7,700
Current Loans		2,572,508		2,465,847
Total LHFI		2,575,422		2,475,245
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		1,583		1,698
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	[2]	1,048
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		283
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		509		8
Nonaccrual		1,076		1,032
Current Loans		838,064		723,440
Total LHFI		838,573		724,480
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		155		8
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		354
Commercial and Industrial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		3,465		668
Nonaccrual		21,156		21,775
Current Loans		1,473,312		1,455,453
Total LHFI		1,476,777		1,477,896
Commercial and Industrial Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		1,595		617
Commercial and Industrial Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		327	[2]	12
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		1,543		39	[2]
Other Construction [Member] | Other Loans Secured by Real Estate [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		3
Current Loans		650,121
Total LHFI		650,124
Other Construction [Member] | Other Loans Secured by Real Estate [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		3
Consumer Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		2,207		2,980
Nonaccrual		84		108
Current Loans		171,471		172,650
Total LHFI		173,678		175,738
Consumer Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		1,608		2,208
Consumer Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		302	[2]	380
Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		297		392	[2]
State and Other Political Subdivision Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		4,079		76
Nonaccrual		4,079		4,079
Current Loans		934,558		963,789
Total LHFI		938,637		967,944
State and Other Political Subdivision Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due				76
State and Other Political Subdivision Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		4,079
Other Commercial Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		1,003
Nonaccrual		867
Current Loans		575,376
Total LHFI	[3]	576,379		495,621
Other Commercial Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		454
Other Commercial Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due	[2]	69
Other Commercial Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due		$ 480
Other Loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due				156
Nonaccrual				825
Current Loans				494,640
Total LHFI				495,621
Other Loans [Member] | Past Due 30 to 59 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due				152
Other Loans [Member] | Past Due 60 to 89 Days [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
Total Past Due				$ 4

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

[2] Past due 90 days or more but still accruing interest.

[3] In accordance with the guidance in FASB ASC Topic 326, Trustmark redefined its LHFI portfolio segments and related loan classes based on the level at which risk is monitored within the ACL methodology. The other loans secured by real estate portfolio segment and related loan classes were separated from the loans secured by real estate portfolio segment. The other construction loans were segregated from the construction, land development and other land loans. The other loans secured by 1-4 family residential properties were segregated from the loans secured by 1-4 family residential properties and the loans secured by 1-4 family residential properties were redefined in the other loans secured by real estate portfolio segment. Other loans were redefined as other commercial loans.

XML

Securities Available for Sale and Held to Maturity - Contractual Maturities of Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Securities Available for Sale, Amortized Cost [Abstract]
Due in one year or less	$ 20,505
Due after one year through five years	1,304
Due after five years through ten years	2,499
Due after ten years	20,480
Total amortized cost, before mortgage-backed securities	44,788
Mortgage-backed securities	1,747,064
Securities Available for Sale, Amortized Cost	1,791,852	$ 1,600,984
Securities Available for Sale, Estimated Fair Value [Abstract]
Due in one year or less	20,617
Due after one year through five years	1,317
Due after five years through ten years	2,456
Due after ten years	20,372
Total fair value, before mortgage-backed securities	44,762
Mortgage-backed securities	1,789,017
Total	1,833,779	1,602,404
Securities Held to Maturity, Amortized Cost [Abstract]
Due in one year or less	5,079
Due after one year through five years	26,679
Due after five years through ten years	0
Due after ten years	0
Total amortized cost, before mortgage-backed securities	31,758
Mortgage-backed securities	672,518
Securities Held to Maturity, Amortized Cost	704,276	738,099
Securities Held to Maturity, Estimated Fair Value [Abstract]
Due in one year or less	5,115
Due after one year through five years	26,985
Due after five years through ten years	0
Due after ten years	0
Total fair value, before mortgage-backed securities	32,100
Mortgage-backed securities	699,341
Total	$ 731,441	$ 746,202

XML

Contingencies - Summary of Changes in ACL on Off-balance Sheet Credit Exposures (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 0
FASB ASU 2016-13 adoption adjustment	29,638
Credit loss expense related to off-balance sheet credit exposures	6,783	[1]
Balance at end of period	$ 36,421	[1]

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

XML

Acquired Loans - Additional Information (Details) - USD ($) $ in Thousands	Jan. 01, 2020	Dec. 31, 2019		Mar. 31, 2019	Dec. 31, 2018
Financing Receivable Allowance For Credit Losses [Line Items]
Acquired loans		$ 72,601
Allowance for loan losses, acquired loans		$ 815	[1]	$ 1,297	$ 1,231
ASU 2016-13 [Member] | Purchased Credit Deteriorated (PCD) Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Acquired loans	$ 72,600
Allowance for loan losses, acquired loans	$ 815

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

XML

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of LHFI by Loan Type and Credit Quality Indicator (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Financing Receivable [Abstract]
Financing receivable commercial		$ 9,567,920
Current		9,537,117	$ 9,269,775
Financing Receivable, Recorded Investment, Past Due		30,803	12,627
Nonaccrual		52,992	53,226
Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		12,481	642	[1]
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Current		485,568	1,161,258
Financing Receivable, Recorded Investment, Past Due		697	636
Nonaccrual		950	897
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		178
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Current			1,832,698
Financing Receivable, Recorded Investment, Past Due			6,405
Nonaccrual			16,810
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due	[1]		211
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Current		2,572,508	2,465,847
Financing Receivable, Recorded Investment, Past Due		2,914	1,698
Nonaccrual		7,323	7,700
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		283
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Current		838,064	723,440
Financing Receivable, Recorded Investment, Past Due		509	8
Nonaccrual		1,076	1,032
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		354
Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
Current		1,473,312	1,455,453
Financing Receivable, Recorded Investment, Past Due		3,465	668
Nonaccrual		21,156	21,775
Commercial and Industrial Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		1,543	39	[1]
Consumer Loans [Member]
Financing Receivable [Abstract]
Current		171,471	172,650
Financing Receivable, Recorded Investment, Past Due		2,207	2,980
Nonaccrual		84	108
Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		297	392	[1]
State and Other Political Subdivision Loans [Member]
Financing Receivable [Abstract]
Current		934,558	963,789
Financing Receivable, Recorded Investment, Past Due		4,079	76
Nonaccrual		4,079	4,079
State and Other Political Subdivision Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due		4,079
Other Loans [Member]
Financing Receivable [Abstract]
Current			494,640
Financing Receivable, Recorded Investment, Past Due			156
Nonaccrual			825
Commercial LHFI [Member]
Financing Receivable [Abstract]
Financing receivable commercial		7,592,362	7,348,158
Commercial LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			1,090,914
Commercial LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			123,033
Commercial LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		2,575,400	2,475,090
Commercial LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			723,785
Commercial LHFI [Member] | Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		1,476,777	1,477,896
Commercial LHFI [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		938,637	967,944
Commercial LHFI [Member] | Other Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial			489,496
Commercial LHFI [Member] | Pass Categories 1-6 [Member]
Financing Receivable [Abstract]
Financing receivable commercial			7,178,617
Commercial LHFI [Member] | Pass Categories 1-6 [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			1,075,146
Commercial LHFI [Member] | Pass Categories 1-6 [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			116,592
Commercial LHFI [Member] | Pass Categories 1-6 [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		2,520,811	2,430,761
Commercial LHFI [Member] | Pass Categories 1-6 [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			721,238
Commercial LHFI [Member] | Pass Categories 1-6 [Member] | Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		1,418,813	1,407,837
Commercial LHFI [Member] | Pass Categories 1-6 [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		928,764	957,948
Commercial LHFI [Member] | Pass Categories 1-6 [Member] | Other Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial			469,095
Commercial LHFI [Member] | Special Mention Category 7 [Member]
Financing Receivable [Abstract]
Financing receivable commercial			9,049
Commercial LHFI [Member] | Special Mention Category 7 [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			45
Commercial LHFI [Member] | Special Mention Category 7 [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		5,566
Commercial LHFI [Member] | Special Mention Category 7 [Member] | Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial			909
Commercial LHFI [Member] | Special Mention Category 7 [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		4,650	4,650
Commercial LHFI [Member] | Special Mention Category 7 [Member] | Other Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial			3,445
Commercial LHFI [Member] | Substandard Category 8 [Member]
Financing Receivable [Abstract]
Financing receivable commercial			159,163
Commercial LHFI [Member] | Substandard Category 8 [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			15,726
Commercial LHFI [Member] | Substandard Category 8 [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			6,355
Commercial LHFI [Member] | Substandard Category 8 [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		48,622	44,001
Commercial LHFI [Member] | Substandard Category 8 [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			2,547
Commercial LHFI [Member] | Substandard Category 8 [Member] | Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		57,126	68,262
Commercial LHFI [Member] | Substandard Category 8 [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		5,223	5,346
Commercial LHFI [Member] | Substandard Category 8 [Member] | Other Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial			16,926
Commercial LHFI [Member] | Doubtful Category 9 [Member]
Financing Receivable [Abstract]
Financing receivable commercial			1,329
Commercial LHFI [Member] | Doubtful Category 9 [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			42
Commercial LHFI [Member] | Doubtful Category 9 [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			41
Commercial LHFI [Member] | Doubtful Category 9 [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		401	328
Commercial LHFI [Member] | Doubtful Category 9 [Member] | Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		838	888
Commercial LHFI [Member] | Doubtful Category 9 [Member] | Other Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial			30
Consumer LHFI [Member]
Financing Receivable [Abstract]
Financing receivable commercial		1,975,558	9,335,628
Current			1,961,967
Nonaccrual			16,057
Subtotal			1,987,470
Consumer LHFI [Member] | Past Due 30-89 Days [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due			8,842
Consumer LHFI [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due			604
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			1,162,791
Current			71,413
Nonaccrual			132
Subtotal			71,877
Consumer LHFI [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due			332
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			1,855,913
Current			1,710,930
Nonaccrual			15,817
Subtotal			1,732,880
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due			5,922
Consumer LHFI [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing Receivable, Recorded Investment, Past Due			211
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial		22	2,475,245
Current			155
Subtotal			155
Consumer LHFI [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member] | Past Due 30-89 Days [Member]
Financing Receivable [Abstract]
Financing receivable commercial		6
Consumer LHFI [Member] | Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable [Abstract]
Financing receivable commercial			724,480
Current			695
Subtotal			695
Consumer LHFI [Member] | Commercial and Industrial Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial			1,477,896
Consumer LHFI [Member] | Consumer Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial		173,678	175,738
Current			172,649
Nonaccrual			108
Subtotal			175,738
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 30-89 Days [Member]
Financing Receivable [Abstract]
Financing receivable commercial		1,897
Financing Receivable, Recorded Investment, Past Due			2,588
Consumer LHFI [Member] | Consumer Loans [Member] | Past Due 90 Days or More [Member]
Financing Receivable [Abstract]
Financing receivable commercial		$ 296
Financing Receivable, Recorded Investment, Past Due			393
Consumer LHFI [Member] | State and Other Political Subdivision Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial			967,944
Consumer LHFI [Member] | Other Loans [Member]
Financing Receivable [Abstract]
Financing receivable commercial			495,621
Current			6,125
Subtotal			$ 6,125

[1] Past due 90 days or more but still accruing interest.

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Stock and Incentive Compensation - Additional Information (Details)	3 Months Ended
	Mar. 31, 2020
Performance Based Award [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Return on average tangible equity, performance measure	100.00%
Total shareholder return, performance measure	100.00%
Time-Vested Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years

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Revenue from Contracts with Customers - Summary of Noninterest Income Disaggregated by Reportable Operating Segment and Revenue Stream (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		$ 10,032	$ 10,265
Bank card and other fees		5,355	7,191
Mortgage banking, net		27,483	3,442
Insurance commissions		11,550	10,871
Wealth management		8,537	7,483
Other, net		2,307	2,239
Total Noninterest Income		65,264	41,491
General Banking Segment [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		10,012	10,240
Bank card and other fees		5,349	7,167
Mortgage banking, net		27,483	3,442
Wealth management		86	91
Other, net		2,246	1,973
Total Noninterest Income		45,176	22,913
Wealth Management Segment [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		20	25
Bank card and other fees		6	24
Wealth management		8,451	7,392
Other, net		39	262
Total Noninterest Income		8,516	7,703
Insurance Segment [Member]
Revenue From Contract With Customer [Line Items]
Insurance commissions		11,550	10,871
Other, net		22	4
Total Noninterest Income		11,572	10,875
Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		10,032	10,265
Bank card and other fees		6,732	6,889
Insurance commissions		11,550	10,871
Wealth management		8,537	7,483
Other, net		1,812	2,484
Total Noninterest Income		38,663	37,992
Topic 606 [Member] | General Banking Segment [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		10,012	10,240
Bank card and other fees		6,726	6,865
Wealth management		86	91
Other, net		1,764	2,244
Total Noninterest Income		18,588	19,440
Topic 606 [Member] | Wealth Management Segment [Member]
Revenue From Contract With Customer [Line Items]
Service charges on deposit accounts		20	25
Bank card and other fees		6	24
Wealth management		8,451	7,392
Other, net		26	236
Total Noninterest Income		8,503	7,677
Topic 606 [Member] | Insurance Segment [Member]
Revenue From Contract With Customer [Line Items]
Insurance commissions		11,550	10,871
Other, net		22	4
Total Noninterest Income		11,572	10,875
Not Topic 606 [Member]
Revenue From Contract With Customer [Line Items]
Bank card and other fees	[1]	(1,377)	302
Mortgage banking, net	[1]	27,483	3,442
Other, net	[1]	495	(245)
Total Noninterest Income	[1]	26,601	3,499
Not Topic 606 [Member] | General Banking Segment [Member]
Revenue From Contract With Customer [Line Items]
Bank card and other fees	[1]	(1,377)	302
Mortgage banking, net	[1]	27,483	3,442
Other, net	[1]	482	(271)
Total Noninterest Income	[1]	26,588	3,473
Not Topic 606 [Member] | Wealth Management Segment [Member]
Revenue From Contract With Customer [Line Items]
Other, net	[1]	13	26
Total Noninterest Income	[1]	$ 13	$ 26

[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.

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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Troubled Debt Restructuring Related to Loans Held for Investment, Excluding Covered Loans, by Loan Type (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Financing Receivable Modifications [Line Items]
Nonaccrual	$ 52,992	$ 53,226
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	950	897
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	4,991
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	21,156	21,775
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	84	108
Other Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	867
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual		16,810
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual	7,323	7,700
Other Loans [Member]
Financing Receivable Modifications [Line Items]
Nonaccrual		$ 825
Troubled Debt Restructurings [Member]
Financing Receivable Modifications [Line Items]
Accruing	2,657
Nonaccrual	23,836
Total	26,493
Troubled Debt Restructurings [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	0
Nonaccrual	2,899
Total	2,899
Troubled Debt Restructurings [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	0
Nonaccrual	14
Total	14
Troubled Debt Restructurings [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing	0
Nonaccrual	3,672
Total	3,672
Troubled Debt Restructurings [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing	2,640
Nonaccrual	17,103
Total	19,743
Troubled Debt Restructurings [Member] | Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing	17
Nonaccrual	23
Total	40
Troubled Debt Restructurings [Member] | Other Commercial Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing	0
Nonaccrual	125
Total	$ 125
Troubled Debt Restructurings [Member]
Financing Receivable Modifications [Line Items]
Accruing			$ 13,844
Nonaccrual			16,388
Total			30,232
Troubled Debt Restructurings [Member] | Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing			0
Nonaccrual			22
Total			22
Troubled Debt Restructurings [Member] | Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing			13,786
Nonaccrual			12,380
Total			26,166
Troubled Debt Restructurings [Member] | Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing			0
Nonaccrual			31
Total			31
Troubled Debt Restructurings [Member] | Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing			58
Nonaccrual			3,098
Total			3,156
Troubled Debt Restructurings [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Modifications [Line Items]
Accruing			0
Nonaccrual			339
Total			339
Troubled Debt Restructurings [Member] | Other Loans [Member]
Financing Receivable Modifications [Line Items]
Accruing			0
Nonaccrual			518
Total			$ 518

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Earnings Per Share (EPS) (Tables)

3 Months Ended

Mar. 31, 2020

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 March 31,
	2020		2019
Basic shares		63,757		65,239
Dilutive shares		157		140
Diluted shares		63,914		65,379

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 March 31,
	2020		2019
Weighted-average antidilutive stock awards		52		55

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Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2020

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 as of March 31, 2020 and December 31, 2019 as well as the effect of these derivative instruments on Trustmark’s results of operations for the periods presented ($ in thousands):

	March 31, 2020		December 31, 2019
Derivatives not designated as hedging instruments
Interest rate contracts:
Futures contracts included in other assets	$	13,637	$	—
Exchange traded purchased options included in other assets		7,938		244
OTC written options (rate locks) included in other assets		9,826		1,439
Interest rate swaps included in other assets		41,154		16,209
Credit risk participation agreements included in other assets		109		64
Futures contracts included in other liabilities		—		2,654
Forward contracts included in other liabilities		9,318		486
Exchange traded written options included in other liabilities		221		1,760
Interest rate swaps included in other liabilities		2,960		1,122
Credit risk participation agreements included in other liabilities		125		41

Effects of Derivative Instruments on Statements of Operations

	Three Months Ended March 31,
	2020			2019
Derivatives in hedging relationships
Amount of gain (loss) reclassified from accumulated other    comprehensive income (loss) and recognized in other interest expense	$	—		$	171
Derivatives not designated as hedging instruments
Amount of gain (loss) recognized in mortgage banking, net	$	33,486		$	4,853
Amount of gain (loss) recognized in bank card and other fees		(1,660	)		(256	)

Schedule of Amount Included in Other Comprehensive Income for Derivative Instruments Designated as Hedges of Cash Flows

The following table discloses the amount included in other comprehensive income (loss), net of tax, for derivative instruments designated as cash flow hedges for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020		2019
Derivatives in cash flow hedging relationship
Amount of gain (loss) recognized in other comprehensive    income (loss), net of tax	$	—	$	(47	)

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 March 31, 2020 and December 31, 2019 is presented in the following tables ($ in thousands):

Offsetting of Derivative Assets
As of March 31, 2020
							Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets presented in the Statement of Financial Position		Financial Instruments			Cash Collateral Received		Net Amount
Derivatives	$	41,154	$	—	$	41,154	$	(1	)	$	—	$	41,153

Offsetting of Derivative Liabilities
As of March 31, 2020
							Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities presented in the Statement of Financial Position		Financial Instruments			Cash Collateral Posted			Net Amount
Derivatives	$	2,960	$	—	$	2,960	$	(1	)	$	(2,820	)	$	139

Offsetting of Derivative Assets
As of December 31, 2019
							Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets presented in the Statement of Financial Position		Financial Instruments		Cash Collateral Received		Net Amount
Derivatives	$	16,209	$	—	$	16,209	$	—	$	—	$	16,209

Offsetting of Derivative Liabilities
As of December 31, 2019
							Gross Amounts Not Offset in the Statement of Financial Position
	Gross Amounts of Recognized Liabilities		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities presented in the Statement of Financial Position		Financial Instruments		Cash Collateral Posted			Net Amount
Derivatives	$	1,122	$	—	$	1,122	$	—	$	(1,390	)	$	(268	)

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Segment Information

3 Months Ended

Mar. 31, 2020

Segment Reporting [Abstract]

Segment Information

Note 19 – 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 22 – Segment Information included in Part II. Item 8. – Financial Statements and Supplementary Data, of Trustmark’s 2019 Annual Report.  During the first quarter of 2020, Trustmark revised the composition of its operating segments by moving the Retail Private Banking Group from the General Banking Segment to the Wealth Management Segment as a result of a change in supervision of this group for segment reporting purposes. The prior period amounts presented include reclassifications to conform to the current period presentation.

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 March 31,
	2020			2019
General Banking
Net interest income	$	102,403		$	103,005
Provision for credit losses		18,374			1,693
Noninterest income		45,176			22,913
Noninterest expense		106,450			90,015
Income before income taxes		22,755			34,210
Income taxes		2,091			4,155
General banking net income	$	20,664		$	30,055
Selected Financial Information
Total assets	$	13,663,877		$	13,077,106
Depreciation and amortization	$	8,794		$	9,139
Wealth Management
Net interest income	$	1,504		$	1,748
Provision for credit losses		2,207			(4	)
Noninterest income		8,516			7,703
Noninterest expense		8,516			7,663
Income before income taxes		(703	)		1,792
Income taxes		(176	)		444
Wealth management net income	$	(527	)	$	1,348
Selected Financial Information
Total assets	$	280,181		$	329,319
Depreciation and amortization	$	67		$	69
Insurance
Net interest income	$	45		$	55
Noninterest income		11,572			10,875
Noninterest expense		8,844			8,343
Income before income taxes		2,773			2,587
Income taxes		692			651
Insurance net income	$	2,081		$	1,936
Selected Financial Information
Total assets	$	75,771		$	71,592
Depreciation and amortization	$	135		$	129
Consolidated
Net interest income	$	103,952		$	104,808
Provision for credit losses		20,581			1,689
Noninterest income		65,264			41,491
Noninterest expense		123,810			106,021
Income before income taxes		24,825			38,589
Income taxes		2,607			5,250
Consolidated net income	$	22,218		$	33,339
Selected Financial Information
Total assets	$	14,019,829		$	13,478,017
Depreciation and amortization	$	8,996		$	9,337

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Statements of Cash Flows

3 Months Ended

Mar. 31, 2020

Supplemental Cash Flow Information [Abstract]

Statements of Cash Flows

Note 15 – Statements of Cash Flows

The following table reflects specific transaction amounts for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020		2019
Interest expense paid on deposits and borrowings	$	16,807	$	20,501
Noncash transfers from loans to other real estate		336		785
Securities purchased not settled		—		1,095
Finance right-of-use assets resulting from lease liabilities		—		11,230
Operating right-of-use assets resulting from lease liabilities		671		33,861

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Derivative Financial Instruments - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) Contract	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) Contract	Apr. 04, 2013 USD ($)
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Period for which cash flow hedges will be used to hedge quarterly interest payments	5 years
Derivative inception date	Dec. 31, 2014
Derivative maturity date	Dec. 31, 2019
Description of variable rate basis for derivative	three-month LIBOR
Ineffectiveness related to interest rate swap designated as a cash flow hedge		$ 0
Accumulated net, after tax gain included in accumulated other comprehensive (loss)			$ 0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Junior Subordinated Debentures [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount				$ 60,000,000.0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Three-month LIBOR [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Swap fixed interest rate to be paid	1.66%
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	3		3
Aggregate notional amount of credit risk participation agreements	$ 37,200,000		$ 37,600,000
Derivatives not Designated as Hedging Instruments [Member] | Guarantor [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of risk participation agreements | Contract	9		10
Aggregate notional amount of credit risk participation agreements	$ 74,900,000		$ 79,300,000
Derivatives not Designated as Hedging Instruments [Member] | Mortgage Servicing Rights Hedge [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	516,500,000		564,000,000.0
Net (negative) positive ineffectiveness on MSR fair value	9,900,000	$ (4,700,000)
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	905,600,000		893,100,000
Termination value of derivatives	2,800,000		1,000,000.0
Collateral Posted	2,800,000
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	454,500,000		209,000,000.0
Valuation adjustment	(9,300,000)		(486,000)
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Lock Commitments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	382,200,000		92,100,000
Valuation adjustment	$ 9,800,000		$ 1,400,000

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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	Mar. 31, 2020	Dec. 31, 2019
Offsetting Derivative Assets
Gross Amounts of Recognized Assets, Offsetting of Derivative Assets	$ 41,154	$ 16,209
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	41,154	16,209
Financial Instruments, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Assets	(1)	0
Cash Collateral Received, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Assets	0	0
Net Amount, Offsetting of Derivative Assets	41,153	16,209
Offsetting Derivative Liabilities
Gross Amounts of Recognized Liabilities, Offsetting of Derivative Liabilities	2,960	1,122
Gross Amounts Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities	0	0
Net Amounts of Liabilities presented in the Statement of Financial Position, Offsetting of Derivative Liabilities	2,960	1,122
Financial Instruments, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities	(1)	0
Cash Collateral Posted, Gross Amounts Not Offset in the Statement of Financial Position, Offsetting of Derivative Liabilities	(2,820)	(1,390)
Net Amount, Offsetting of Derivative Liabilities	$ 139	$ (268)

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Fair Value - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Outstanding balances in collateral dependent related to allowance for credit losses	$ 39,800
Collateral dependent related to allowance for credit losses	2,400
Outstanding balances in impaired loans			$ 41,200
Impaired loans, related allowance			5,500
Foreclosed assets remeasured after initial recognition	3,100	$ 5,700
Write-downs of allowance for foreclosed assets after initial recognition	357	990
Noninterest gain (loss) Mortgage banking, net for changes in fair value of LHFS	7,700	668
Interest earned on LHFS included in Interest and fees on LHFS and LHFI	1,300	$ 1,000
GNMA optional repurchase loans	$ 56,500		$ 57,100

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Shareholders' Equity - Net Change in Components of Accumulated Other Comprehensive Income (Loss) and the Related Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax amount	$ 41,731	$ 19,686
Other comprehensive income (loss), tax (expense) benefit	(10,433)	(4,922)
Other comprehensive income (loss), before reclassifications, net of tax amount	31,026	14,631
Reclassification from accumulated other comprehensive income, current period, net of tax amount	272	133
Other comprehensive income (loss), net of tax amount	31,298	14,764
Securities Available for Sale and Transferred Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, before tax amount	40,507	18,824
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, before tax amount	861	747
Other comprehensive income (loss), before tax amount	41,368	19,571
Other comprehensive income (loss), before reclassifications, tax (expense) benefit	(10,127)	(4,706)
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, tax (expense) benefit	(215)	(187)
Other comprehensive income (loss), tax (expense) benefit	(10,342)	(4,893)
Other comprehensive income (loss), before reclassifications, net of tax amount	30,380	14,118
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, net of tax amount	646	560
Other comprehensive income (loss), net of tax amount	31,026	14,678
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	37	63
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(9)	(16)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	28	47
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	31
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	0	(7)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	0	24
Change in Net Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, current period, before tax amount	326	255
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(82)	(65)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	244	190
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	363	349
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	(91)	(88)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	272	261
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before reclassifications, before tax amount	0	(63)
Reclassification from accumulated other comprehensive income, current period, before tax amount	0	(171)
Other comprehensive income (loss), before tax amount	0	(234)
Other comprehensive income (loss), before reclassifications, tax (expense) benefit	0	16
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit	0	43
Other comprehensive income (loss), tax (expense) benefit	0	59
Other comprehensive income (loss), before reclassifications, net of tax amount	0	(47)
Reclassification from accumulated other comprehensive income, current period, net of tax amount	0	(128)
Other comprehensive income (loss), net of tax amount	$ 0	$ (175)

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Securities Sold Under Repurchase Agreements

3 Months Ended

Mar. 31, 2020

Securities Sold Under Agreements To Repurchase [Abstract]

Securities Sold Under Repurchase Agreements

Note 9 – 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 $100.6 million and $105.6 million at March 31, 2020 and December 31, 2019, respectively.  Trustmark’s repurchase agreements are transacted under master repurchase agreements that give Trustmark, in the event of default by the counterparty, the right of offset with the same counterparty.  As of March 31, 2020, all repurchase agreements were short-term and consisted primarily of sweep repurchase arrangements, under which excess deposits are “swept” into overnight repurchase agreements with Trustmark.  The following table presents the securities sold under repurchase agreements by collateral pledged at March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020		December 31, 2019
Mortgage-backed securities
Other residential mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or GNMA	$	18,461	$	24,282
Commercial mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or GNMA		29,679		29,290
Total securities sold under repurchase agreements	$	48,140	$	53,572

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Mortgage Banking

3 Months Ended

Mar. 31, 2020

Mortgage Banking [Abstract]

Mortgage Banking

Note 5 – Mortgage Banking

Mortgage Servicing Rights

The activity in the mortgage servicing rights (MSR) is detailed in the table below for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	79,394		$	95,596
Origination of servicing assets		3,649			2,507
Change in fair value:
Due to market changes		(23,999	)		(8,863	)
Due to run-off		(2,607	)		(2,398	)
Balance at end of period	$	56,437		$	86,842

Trustmark determines the fair value of the MSR using a valuation model administered by a third party that calculates the present value of estimated future net servicing income.  Trustmark considers the conditional prepayment rate (CPR), which is an estimated loan prepayment rate that uses historical prepayment rates for previous loans similar to the loans being evaluated, and the discount rate in determining the fair value of the MSR. An increase in either the CPR or discount rate assumption will result in a decrease in the fair value of the MSR, while a decrease in either assumption will result in an increase in the fair value of the MSR.  At March 31, 2020, the fair value of the MSR included an assumed average prepayment speed of 17 CPR and an average discount rate of 9.52% compared to an assumed average prepayment speed of 10 CPR and an average discount rate of 10.04% at March 31, 2019.

Mortgage Loans Serviced/Sold

During the first three months of 2020 and 2019, Trustmark sold $317.1 million and $208.9 million, respectively, of residential mortgage loans.  Gains on these sales were recorded as noninterest income in mortgage banking, net and totaled $14.3 million for the first three months of 2020 compared to $5.0 million for the first three months of 2019. 

The table below details the mortgage loans sold and serviced for others at March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020		December 31, 2019
Federal National Mortgage Association	$	4,383,261	$	4,411,914
Government National Mortgage Association		2,685,304		2,652,782
Federal Home Loan Mortgage Corporation		69,389		73,134
Other		18,750		19,404
Total mortgage loans sold and serviced for others	$	7,156,704	$	7,157,234

Trustmark is subject to losses in its loan servicing portfolio due to loan foreclosures.  Trustmark has obligations to either repurchase the outstanding principal balance of a loan or make the purchaser whole for the economic benefits of a loan if it is determined that the loan sold was in violation of representations or warranties made by Trustmark at the time of the sale, herein referred to as mortgage loan servicing putback expenses.  Such representations and warranties typically include those made regarding loans that had missing or insufficient file documentation, loans that do not meet investor guidelines, loans in which the appraisal does not support the value and/or loans obtained through fraud by the borrowers or other third parties.  Generally, putback requests may be made until the loan is paid in full.  However, mortgage loans delivered to Federal National Mortgage Association (FNMA) and Federal Home Loan Mortgage Corporation (FHLMC) on or after January 1, 2013 are subject to the Lending and Selling Representations and Warranties Framework updated in May 2014, 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 March 31, 2020 and 2019, Trustmark had a reserve for mortgage loan servicing putback expenses of $500 thousand and $875 thousand, respectively.

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.

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Earnings Per Share (EPS) - Weighted-Average Antidilutive Stock Awards Excluded from Determining Diluted EPS (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Weighted-average antidilutive stock awards (in shares)	52	55

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Revenue from Contracts with Customers (Tables)

3 Months Ended

Mar. 31, 2020

Revenue From Contract With Customer [Abstract]

Summary of Noninterest Income Disaggregated by Reportable Operating Segment and Revenue Stream

The following table presents noninterest income disaggregated by reportable operating segment and revenue stream for the periods presented ($ in thousands):

	Three Months Ended March 31, 2020							Three Months Ended March 31, 2019
	Topic 606		Not Topic 606 (1)			Total		Topic 606		Not Topic 606 (1)			Total
General Banking Segment
Service charges on deposit accounts	$	10,012	$	—		$	10,012	$	10,240	$	—		$	10,240
Bank card and other fees		6,726		(1,377	)		5,349		6,865		302			7,167
Mortgage banking, net		—		27,483			27,483		—		3,442			3,442
Wealth management		86		—			86		91		—			91
Other, net		1,764		482			2,246		2,244		(271	)		1,973
Total noninterest income	$	18,588	$	26,588		$	45,176	$	19,440	$	3,473		$	22,913
Wealth Management Segment
Service charges on deposit accounts	$	20	$	—		$	20	$	25	$	—		$	25
Bank card and other fees		6		—			6		24		—			24
Wealth management		8,451		—			8,451		7,392		—			7,392
Other, net		26		13			39		236		26			262
Total noninterest income	$	8,503	$	13		$	8,516	$	7,677	$	26		$	7,703
Insurance Segment
Insurance commissions	$	11,550	$	—		$	11,550	$	10,871	$	—		$	10,871
Other, net		22		—			22		4		—			4
Total noninterest income	$	11,572	$	—		$	11,572	$	10,875	$	—		$	10,875
Consolidated
Service charges on deposit accounts	$	10,032	$	—		$	10,032	$	10,265	$	—		$	10,265
Bank card and other fees		6,732		(1,377	)		5,355		6,889		302			7,191
Mortgage banking, net		—		27,483			27,483		—		3,442			3,442
Insurance commissions		11,550		—			11,550		10,871		—			10,871
Wealth management		8,537		—			8,537		7,483		—			7,483
Other, net		1,812		495			2,307		2,484		(245	)		2,239
Total noninterest income	$	38,663	$	26,601		$	65,264	$	37,992	$	3,499		$	41,491

(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.

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Securities Available for Sale and Held to Maturity (Tables)

3 Months Ended

Mar. 31, 2020

Investments Debt And Equity Securities [Abstract]

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 March 31, 2020 ($ in thousands):

	Securities Held to Maturity Amortized Cost
March 31, 2020
Aaa	$	672,519
Aa1 to Aa3		26,208
Not Rated (1)		5,549
Total	$	704,276

(1) Not rated securities primarily consist of Mississippi municipal general obligations.

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 March 31, 2020 and December 31, 2019 ($ in thousands):

	Securities Available for Sale									Securities Held to Maturity
March 31, 2020	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. Government agency obligations	$	21,704	$	78	$	(592	)	$	21,190	$	—	$	—	$	—		$	—
Obligations of states and political    subdivisions		23,084		488		—			23,572		31,758		383		(41	)		32,100
Mortgage-backed securities
Residential mortgage pass-through    securities
Guaranteed by GNMA		70,106		1,868		(3	)		71,971		10,492		501		—			10,993
Issued by FNMA and FHLMC		949,400		18,854		(925	)		967,329		91,971		1,565		—			93,536
Other residential mortgage-backed    securities
Issued or guaranteed by FNMA,    FHLMC or GNMA		615,004		19,071		—			634,075		463,175		21,848		—			485,023
Commercial mortgage-backed securities
Issued or guaranteed by FNMA,    FHLMC or GNMA		112,554		3,109		(21	)		115,642		106,880		2,915		(6	)		109,789
Total	$	1,791,852	$	43,468	$	(1,541	)	$	1,833,779	$	704,276	$	27,212	$	(47	)	$	731,441
December 31, 2019
U.S. Government agency obligations	$	22,965	$	69	$	(707	)	$	22,327	$	3,781	$	220	$	—		$	4,001
Obligations of states and political    subdivisions		24,952		513		—			25,465		31,781		434		(53	)		32,162
Mortgage-backed securities
Residential mortgage pass-through    securities
Guaranteed by GNMA		69,196		425		(369	)		69,252		10,820		266		(10	)		11,076
Issued by FNMA and FHLMC		714,350		2,171		(3,165	)		713,356		96,631		286		(370	)		96,547
Other residential mortgage-backed    securities
Issued or guaranteed by FNMA,    FHLMC or GNMA		656,162		3,777		(1,713	)		658,226		485,324		7,026		(656	)		491,694
Commercial mortgage-backed securities
Issued or guaranteed by FNMA,    FHLMC or GNMA		113,359		625		(206	)		113,778		109,762		1,042		(82	)		110,722
Total	$	1,600,984	$	7,580	$	(6,160	)	$	1,602,404	$	738,099	$	9,274	$	(1,171	)	$	746,202

Securities with Gross Unrealized Losses, Segregated by Length of Impairment

The tables below include securities with gross unrealized losses for which an allowance for credit losses has not been recorded and segregated by length of impairment at March 31, 2020 and December 31, 2019 ($ in thousands):

	Less than 12 Months					12 Months or More					Total
March 31, 2020	Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses			Estimated Fair Value		Gross Unrealized Losses
U.S. Government agency obligations	$	3,245	$	(23	)	$	12,708	$	(569	)	$	15,953	$	(592	)
Obligations of states and political subdivisions		—		—			6,217		(41	)		6,217		(41	)
Mortgage-backed securities
Residential mortgage pass-through securities
Guaranteed by GNMA		65		(1	)		774		(2	)		839		(3	)
Issued by FNMA and FHLMC		17,254		(136	)		55,755		(789	)		73,009		(925	)
Commercial mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or    GNMA		8,468		(17	)		672		(10	)		9,140		(27	)
Total	$	29,032	$	(177	)	$	76,126	$	(1,411	)	$	105,158	$	(1,588	)
December 31, 2019
U.S. Government agency obligations	$	6,585	$	(105	)	$	12,886	$	(602	)	$	19,471	$	(707	)
Obligations of states and political subdivisions		—		—			6,216		(53	)		6,216		(53	)
Mortgage-backed securities
Residential mortgage pass-through securities
Guaranteed by GNMA		23,544		(107	)		18,529		(272	)		42,073		(379	)
Issued by FNMA and FHLMC		112,879		(230	)		278,120		(3,305	)		390,999		(3,535	)
Other residential mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or    GNMA		158,341		(738	)		151,271		(1,631	)		309,612		(2,369	)
Commercial mortgage-backed securities
Issued or guaranteed by FNMA, FHLMC or    GNMA		51,312		(167	)		14,155		(121	)		65,467		(288	)
Total	$	352,661	$	(1,347	)	$	481,177	$	(5,984	)	$	833,838	$	(7,331	)

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 March 31, 2020, by contractual maturity, are shown below ($ in thousands).  Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	Securities Available for Sale				Securities Held to Maturity
	Amortized Cost		Estimated Fair Value		Amortized Cost		Estimated Fair Value
Due in one year or less	$	20,505	$	20,617	$	5,079	$	5,115
Due after one year through five years		1,304		1,317		26,679		26,985
Due after five years through ten years		2,499		2,456		—		—
Due after ten years		20,480		20,372		—		—
		44,788		44,762		31,758		32,100
Mortgage-backed securities		1,747,064		1,789,017		672,518		699,341
Total	$	1,791,852	$	1,833,779	$	704,276	$	731,441

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Other Real Estate (Tables)

3 Months Ended

Mar. 31, 2020

Other Real Estate And Foreclosed Assets [Abstract]

Changes and Gains (Losses), Net on Other Real Estate

For the periods presented, changes and gains (losses), net on other real estate were as follows ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	29,248		$	34,668
Additions		336			785
Disposals		(3,741	)		(1,658	)
Write-downs		(996	)		(1,656	)
Balance at end of period	$	24,847		$	32,139
Gains (losses), net on the sale of other real estate included in    other real estate expense	$	(70	)	$	122

Other Real Estate, By Type of Property

At March 31, 2020 and December 31, 2019, other real estate by type of property consisted of the following ($ in thousands):

	March 31, 2020		December 31, 2019
Construction, land development and other land properties	$	9,816	$	11,482
1-4 family residential properties		2,499		3,453
Nonfarm, nonresidential properties		12,532		14,313
Total other real estate	$	24,847	$	29,248

Other Real Estate, By Geographic Location

At March 31, 2020 and December 31, 2019, other real estate by geographic location consisted of the following ($ in thousands):

	March 31, 2020		December 31, 2019
Alabama	$	6,229	$	8,133
Florida		4,835		5,877
Mississippi (1)		13,296		14,919
Tennessee (2)		487		319
Texas		—		—
Total other real estate	$	24,847	$	29,248

(1) Mississippi includes Central and Southern Mississippi Regions.

(2) Tennessee includes Memphis, Tennessee and Northern Mississippi Regions.

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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Additional Information (Details 1)	3 Months Ended
	Mar. 31, 2020 USD ($) Loan Region	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable Impaired [Line Items]
Accrued interest receivable	$ 30,800
Maximum concentration of loan as a percentage of total LHFI	10.00%
Key market regions | Region	5
Number of days to pass to be classified as past due LHFI	30 days
Minimum loan amount for loan to be specifically reviewed for impairment and deemed impaired			$ 500,000
LHFI classified as TDRs	$ 26,500,000	$ 30,200,000
LHFI classified as TDRs from credits with interest only payments	18,300,000	24,800,000
Unused commitments on TDRs	10,700,000	4,400,000
Financing receivable, related allowance	210,000	2,800,000
Financing receivable, related charge-offs	$ 2,200,000	$ 43,000
Number of individual loans modified as per CARES Act | Loan	503
Aggregate principal balances of loans modified as per CARES Act	$ 344,300,000
Period of extension on interest part of loans modified as per CARES Act	90 days
Period of extension on full payment deferrals part of loans modified as per CARES Act	90 days
Commercial Credits [Member]
Financing Receivable Impaired [Line Items]
Number of days past due for loan to be classified as nonaccrual	90 days
Non-Business Purpose Credits [Member]
Financing Receivable Impaired [Line Items]
Number of days past due for loan to be classified as nonaccrual	120 days

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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	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	$ 1,791,852	$ 1,600,984
Securities Available for Sale, Gross Unrealized Gains	43,468	7,580
Securities Available for Sale, Gross Unrealized (Losses)	(1,541)	(6,160)
Securities Available for Sale, Estimated Fair Value	1,833,779	1,602,404
Securities Held to Maturity, Amortized Cost	704,276	738,099
Securities Held to Maturity, Gross Unrealized Gains	27,212	9,274
Securities Held to Maturity, Gross Unrealized (Losses)	(47)	(1,171)
Securities Held to Maturity, Estimated Fair Value	731,441	746,202
U.S. Government Agency Obligations [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Available for Sale, Amortized Cost	21,704	22,965
Securities Available for Sale, Gross Unrealized Gains	78	69
Securities Available for Sale, Gross Unrealized (Losses)	(592)	(707)
Securities Available for Sale, Estimated Fair Value	21,190	22,327
Securities Held to Maturity, Amortized Cost	0	3,781
Securities Held to Maturity, Gross Unrealized Gains	0	220
Securities Held to Maturity, Gross Unrealized (Losses)	0	0
Securities Held to Maturity, Estimated Fair Value	0	4,001
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	23,084	24,952
Securities Available for Sale, Gross Unrealized Gains	488	513
Securities Available for Sale, Gross Unrealized (Losses)	0	0
Securities Available for Sale, Estimated Fair Value	23,572	25,465
Securities Held to Maturity, Amortized Cost	31,758	31,781
Securities Held to Maturity, Gross Unrealized Gains	383	434
Securities Held to Maturity, Gross Unrealized (Losses)	(41)	(53)
Securities Held to Maturity, Estimated Fair Value	32,100	32,162
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	70,106	69,196
Securities Available for Sale, Gross Unrealized Gains	1,868	425
Securities Available for Sale, Gross Unrealized (Losses)	(3)	(369)
Securities Available for Sale, Estimated Fair Value	71,971	69,252
Securities Held to Maturity, Amortized Cost	10,492	10,820
Securities Held to Maturity, Gross Unrealized Gains	501	266
Securities Held to Maturity, Gross Unrealized (Losses)	0	(10)
Securities Held to Maturity, Estimated Fair Value	10,993	11,076
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	949,400	714,350
Securities Available for Sale, Gross Unrealized Gains	18,854	2,171
Securities Available for Sale, Gross Unrealized (Losses)	(925)	(3,165)
Securities Available for Sale, Estimated Fair Value	967,329	713,356
Securities Held to Maturity, Amortized Cost	91,971	96,631
Securities Held to Maturity, Gross Unrealized Gains	1,565	286
Securities Held to Maturity, Gross Unrealized (Losses)	0	(370)
Securities Held to Maturity, Estimated Fair Value	93,536	96,547
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	615,004	656,162
Securities Available for Sale, Gross Unrealized Gains	19,071	3,777
Securities Available for Sale, Gross Unrealized (Losses)	0	(1,713)
Securities Available for Sale, Estimated Fair Value	634,075	658,226
Securities Held to Maturity, Amortized Cost	463,175	485,324
Securities Held to Maturity, Gross Unrealized Gains	21,848	7,026
Securities Held to Maturity, Gross Unrealized (Losses)	0	(656)
Securities Held to Maturity, Estimated Fair Value	485,023	491,694
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	112,554	113,359
Securities Available for Sale, Gross Unrealized Gains	3,109	625
Securities Available for Sale, Gross Unrealized (Losses)	(21)	(206)
Securities Available for Sale, Estimated Fair Value	115,642	113,778
Securities Held to Maturity, Amortized Cost	106,880	109,762
Securities Held to Maturity, Gross Unrealized Gains	2,915	1,042
Securities Held to Maturity, Gross Unrealized (Losses)	(6)	(82)
Securities Held to Maturity, Estimated Fair Value	$ 109,789	$ 110,722

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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Impact of Modifications Classified as Troubled Debt Restructurings (Details) - Troubled Debt Restructurings [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) Contract	Mar. 31, 2019 USD ($) Contract
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	11	10
Pre-Modification Outstanding Recorded Investment	$ 2,103	$ 9,170
Post-Modification Outstanding Recorded Investment	$ 2,103	$ 9,170
Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	5	2
Pre-Modification Outstanding Recorded Investment	$ 501	$ 86
Post-Modification Outstanding Recorded Investment	$ 501	$ 86
Consumer Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	4	2
Pre-Modification Outstanding Recorded Investment	$ 20	$ 30
Post-Modification Outstanding Recorded Investment	$ 20	$ 30
Commercial and Industrial Loans [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts | Contract	2	6
Pre-Modification Outstanding Recorded Investment	$ 1,582	$ 9,054
Post-Modification Outstanding Recorded Investment	$ 1,582	$ 9,054

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Acquired Loans - Changes in Accretable Yield of Acquired Loans (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Change in accretable difference on acquired loans [Abstract]
Accretable yield at beginning of period		$ (14,816)	$ (17,722)	$ (17,722)
FASB ASU 2016-13 adoption adjustment		$ 14,816
Accretion to interest income			1,563
Disposals, net			469
Reclassification from nonaccretable difference	[1]		(1,725)
Accretable yield at end of period			$ (17,415)	$ (14,816)

[1] Reclassifications from nonaccretable difference are due to lower loss expectations and improvements in expected cash flows.

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Other Real Estate - Additional information (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward
Foreclosed residential real estate properties recorded as a result of obtaining physical possession of property	$ 2,500	$ 3,500
Consumer mortgage loans and that formal foreclosure proceedings are in process	$ 767	$ 953

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Leases - Future Minimum Rental Commitments Under Finance and Operating Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Finance leases, 2020 (excluding the three months ended March 31, 2020)	$ 1,443
Finance leases, 2021	1,615
Finance leases, 2022	1,556
Finance leases, 2023	871
Finance leases, 2024	572
Thereafter	4,452
Finance leases, total minimum lease payments	10,509
Finance leases, imputed interest	(1,448)
Finance lease liabilities	9,061	$ 9,520
Operating leases, 2020 (excluding the three months ended March 31, 2020)	3,742
Operating leases, 2021	4,648
Operating leases, 2022	4,173
Operating leases, 2023	4,136
Operating leases, 2024	4,040
Thereafter	16,726
Operating leases, total minimum lease payments	37,465
Operating leases, imputed interest	(5,410)
Operating lease liabilities	$ 32,055	$ 32,354

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Mortgage Banking - Schedule of Activity in the Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Mortgage servicing rights [Abstract]
Balance at beginning of period	$ 79,394	$ 95,596
Origination of servicing assets	3,649	2,507
Change in fair value [Abstract]
Due to market changes	(23,999)	(8,863)
Due to run-off	(2,607)	(2,398)
Balance at end of period	$ 56,437	$ 86,842

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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Securities available-for-sale, amortized cost	$ 1,791,852	$ 1,600,984
Securities available-for-sale, allowance for credit Losses	0	0
Securities held to maturity, net of allowance for credit losses	0	0
Securities held to maturity, fair value	$ 731,441	$ 746,202
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)	63,396,912	64,200,111
Common stock, outstanding (in shares)	63,396,912	64,200,111

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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Stockholders Equity [Abstract]
Cash dividends paid on common stock (in dollars per share)	$ 0.23	$ 0.23

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Business, Basis of Financial Statement Presentation and Principles of Consolidation (Details) $ in Millions	1 Months Ended	3 Months Ended
	Apr. 23, 2020 USD ($) Loan	Mar. 31, 2020 USD ($) Office Loan
Business Basis Of Financial Statement Presentation And Principles Of Consolidation [Line Items]
Number of offices | Office		188
Number of individual loans modified as per CARES Act | Loan		503
Aggregate principal balances of loans modified as per CARES Act | $		$ 344.3
Period of extension on interest part of loans modified as per CARES Act		90 days
Period of extension on full payment deferrals part of loans modified as per CARES Act		90 days
Subsequent Event [Member]
Business Basis Of Financial Statement Presentation And Principles Of Consolidation [Line Items]
Number of individual loans modified as per CARES Act | Loan	1,978
Aggregate principal balances of loans modified as per CARES Act | $	$ 976.2
Period of extension on interest part of loans modified as per CARES Act	90 days
Period of extension on full payment deferrals part of loans modified as per CARES Act	90 days

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Stock and Incentive Compensation (Tables)

3 Months Ended

Mar. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Plan Activity

The following table summarize the Stock Plan activity for the periods presented:

	Three Months Ended March 31, 2020
	Performance Awards and Units			Time-Vested Awards and Units
Nonvested shares, beginning of period		149,914			300,006
Granted		53,450			115,520
Released from restriction		(36,357	)		(79,441	)
Forfeited		(19,474	)		(6,353	)
Nonvested shares, end of period		147,533			329,732

Compensation Expense for Awards and Units Under Stock Plan

The following table presents information regarding compensation expense for awards and units under the Stock Plan for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Performance awards and units	$	(513	)	$	81
Time-vested awards and units		1,907			921
Total compensation expense	$	1,394		$	1,002

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Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2020

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 March 31, 2020 and December 31, 2019 ($ in thousands):

	Actual
	Regulatory Capital					Minimum			To Be Well
	Amount		Ratio			Requirement			Capitalized
At March 31, 2020:
Common Equity Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,297,083		11.35	%		7.00	%	n/a
Trustmark National Bank		1,336,080		11.69	%		7.00	%		6.50	%
Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,357,083		11.88	%		8.50	%	n/a
Trustmark National Bank		1,336,080		11.69	%		8.50	%		8.00	%
Total Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,460,942		12.78	%		10.50	%	n/a
Trustmark National Bank		1,439,939		12.60	%		10.50	%		10.00	%
Tier 1 Leverage (to Average Assets)
Trustmark Corporation	$	1,357,083		10.21	%		4.00	%	n/a
Trustmark National Bank		1,336,080		10.07	%		4.00	%		5.00	%
At December 31, 2019:
Common Equity Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,312,668		11.93	%		7.00	%	n/a
Trustmark National Bank		1,352,893		12.30	%		7.00	%		6.50	%
Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,372,668		12.48	%		8.50	%	n/a
Trustmark National Bank		1,352,893		12.30	%		8.50	%		8.00	%
Total Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,457,760		13.25	%		10.50	%	n/a
Trustmark National Bank		1,437,985		13.07	%		10.50	%		10.00	%
Tier 1 Leverage (to Average Assets)
Trustmark Corporation	$	1,372,668		10.48	%		4.00	%	n/a
Trustmark National Bank		1,352,893		10.35	%		4.00	%		5.00	%

Net Change in Components of Accumulated Other Comprehensive Income (Loss) and the Related Tax Effects

	Three Months Ended March 31, 2020							Three Months Ended March 31, 2019
	Before Tax Amount		Tax (Expense) Benefit			Net of Tax Amount		Before Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Securities available for sale and transferred securities:
Net unrealized holding gains (losses) arising    during the period	$	40,507	$	(10,127	)	$	30,380	$	18,824		$	(4,706	)	$	14,118
Change in net unrealized holding loss on    securities transferred to held to maturity		861		(215	)		646		747			(187	)		560
Total securities available for sale    and transferred securities		41,368		(10,342	)		31,026		19,571			(4,893	)		14,678
Pension and other postretirement benefit plans:
Reclassification adjustments for changes realized    in net income:
Net change in prior service costs		37		(9	)		28		63			(16	)		47
Recognized net loss due to lump sum    settlements		—		—			—		31			(7	)		24
Change in net actuarial loss		326		(82	)		244		255			(65	)		190
Total pension and other postretirement benefit    plans		363		(91	)		272		349			(88	)		261
Cash flow hedge derivatives:
Change in accumulated gain (loss) on effective    cash flow hedge derivatives		—		—			—		(63	)		16			(47	)
Reclassification adjustment for (gain) loss realized    in net income		—		—			—		(171	)		43			(128	)
Total cash flow hedge derivatives		—		—			—		(234	)		59			(175	)
Total other comprehensive income (loss)	$	41,731	$	(10,433	)	$	31,298	$	19,686		$	(4,922	)	$	14,764

Components of Reclassifications Out of Accumulated Other Comprehensive Income (Loss)

The following table presents the changes in the balances of each component of accumulated other comprehensive income (loss) for the periods presented ($ in thousands).  All amounts are presented net of tax.

	Securities Available for Sale and Transferred Securities			Defined Benefit Pension Items			Cash Flow Hedge Derivatives			Total
Balance at January 1, 2020	$	(8,017	)	$	(15,583	)	$	—		$	(23,600	)
Other comprehensive income (loss) before reclassification		31,026			—			—			31,026
Amounts reclassified from accumulated other    comprehensive income (loss)		—			272			—			272
Net other comprehensive income (loss)		31,026			272			—			31,298
Balance at March 31, 2020	$	23,009		$	(15,311	)	$	—		$	7,698
Balance at January 1, 2019	$	(43,824	)	$	(12,324	)	$	469		$	(55,679	)
Other comprehensive income (loss) before reclassification		14,678			—			(47	)		14,631
Amounts reclassified from accumulated other    comprehensive income (loss)		—			261			(128	)		133
Net other comprehensive income (loss)		14,678			261			(175	)		14,764
Balance at March 31, 2019	$	(29,146	)	$	(12,063	)	$	294		$	(40,915	)

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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of Balance in Allowance for Loan Losses (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss			$ 5,500
Total	[1]	$ 100,564	84,277
Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		2,353	5,459
Collectively Evaluated for Credit Loss		98,211	78,818
Total		100,564	84,277	$ 79,005	$ 79,290
Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		39,840	41,217
Collectively Evaluated for Credit Loss		9,528,080	9,294,411
Total		9,567,920	9,335,628	79,005	79,290
Commercial and Industrial Loans [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		26	707
Collectively Evaluated for Credit Loss		14,538	25,285
Total		14,564	25,992
Commercial and Industrial Loans [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		19,067	23,458
Collectively Evaluated for Credit Loss		1,457,710	1,454,438
Total		1,476,777	1,477,896	29,202	27,359
Consumer Loans [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss		6,596	3,379
Total		6,596	3,379
Consumer Loans [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss			21
Collectively Evaluated for Credit Loss		173,678	175,717
Total		173,678	175,738	3,148	2,890
State and Other Political Subdivision Loans [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		1,809	1,809
Collectively Evaluated for Credit Loss		1,632	420
Total		3,441	2,229
State and Other Political Subdivision Loans [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		4,079	4,079
Collectively Evaluated for Credit Loss		934,558	963,865
Total		938,637	967,944	792	990
Other Commercial Loans [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		518
Collectively Evaluated for Credit Loss		5,502
Total		6,020	5,303
Other Commercial Loans [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		748
Collectively Evaluated for Credit Loss		575,631
Total		576,379
Other Loans [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss			553
Collectively Evaluated for Credit Loss			4,750
Total			5,303
Other Loans [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss			784
Collectively Evaluated for Credit Loss			494,837
Total			495,621	5,402	6,194
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss		9,079	8,260
Total		9,079	8,260
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		1,804	626
Collectively Evaluated for Credit Loss		484,461	1,162,165
Total		486,265	1,162,791	7,524	7,390
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss		11,711
Total		11,711	5,888
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		519
Collectively Evaluated for Credit Loss		584,462
Total		584,981
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss			2,355
Collectively Evaluated for Credit Loss		28,127	23,803
Total		28,127	26,158
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		12,054	6,717
Collectively Evaluated for Credit Loss		2,563,368	2,468,528
Total		2,575,422	2,475,245	21,479	22,376
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss		5,273	4,024
Total		5,273	4,024
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		65	68
Collectively Evaluated for Credit Loss		838,508	724,412
Total		838,573	724,480	3,077	3,450
Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss			35
Collectively Evaluated for Credit Loss			8,897
Total			8,932
Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss			5,464
Collectively Evaluated for Credit Loss			1,850,449
Total			1,855,913	$ 8,381	$ 8,641
Other Loans Secured by Real Estate [Member] | Other Construction [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss		7,711
Total		7,711	1,889
Other Loans Secured by Real Estate [Member] | Other Construction [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss		650,124
Total		650,124
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Collectively Evaluated for Credit Loss		8,042
Total		8,042	$ 3,044
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Allowance for Loan Losses, LHFI [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Individually Evaluated for Credit Loss		1,504
Collectively Evaluated for Credit Loss		1,265,580
Total		$ 1,267,084

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

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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
	Mar. 31, 2020	Mar. 31, 2019
Compensation expense [Abstract]
Recognized compensation expense	$ 1,394	$ 1,002
Performance Awards and Units [Member]
Compensation expense [Abstract]
Recognized compensation expense	(513)	81
Time-Vested Awards and Units [Member]
Compensation expense [Abstract]
Recognized compensation expense	$ 1,907	$ 921

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Defined Benefit and Other Postretirement Benefits - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
The Continuing Plan [Member] | Scenario 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	$ 306

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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Additional Information (Details 2)		3 Months Ended
		Mar. 31, 2020 USD ($) KeyRatio	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Recorded Investment, Aging [Abstract]
Number of days used as baseline in evaluating collateral documentation exceptions for loan policy		90 days
Number of key quality ratios | KeyRatio		6
LHFS past due 90 days or more		$ 43,600,000		$ 41,600,000
Percentage of outstanding principal to be repurchased under GNMA optional repurchase program		100.00%
Minimum exposure for commercial accruing substandard loans to be reviewed on an individual basis		$ 1,000,000.0
Financing Receivable [Abstract]
PCL	[1]	20,581,000	$ 1,611,000
Allowance for Credit Losses, ACL [Member]
Financing Receivable [Abstract]
PCL		20,581,000	$ 1,611,000
Commercial and Industrial Loans [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable [Abstract]
PCL		(2,024,000)
State and Other Political Subdivision Loans [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable [Abstract]
PCL		(1,243,000)
Other Commercial Loans [Member] | Allowance for Credit Losses, ACL [Member]
Financing Receivable [Abstract]
PCL		$ (1,150,000)
Minimum [Member]
Financing Receivable [Abstract]
Period to conduct asset review		6 months
Credit amount used as baseline in evaluating loan policy		$ 100,000
Maximum [Member]
Financing Receivable [Abstract]
Period to conduct asset review		18 months

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

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Fair Value - Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities held to maturity		$ 704,276	$ 738,099
Net LHFI		9,467,356	9,251,351
Acquired loans			71,786
Deposits		11,575,764	11,245,557
Federal funds purchased and securities sold under repurchase agreements		421,821	256,020
Other borrowings		84,230	85,396
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		406,341	358,916
Securities held to maturity		704,276	738,099
Deposits		11,575,764	11,245,557
Federal funds purchased and securities sold under repurchase agreements		421,821	256,020
Other borrowings		84,230	85,396
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		406,341	358,916
Securities held to maturity		731,441	746,202
Deposits		11,584,178	11,250,071
Federal funds purchased and securities sold under repurchase agreements		421,821	256,020
Other borrowings		84,227	85,374
Junior subordinated debt securities		46,392	50,722
Level 3 [Member] | Carrying Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI		9,467,356	9,251,351
Acquired loans	[1]	0	71,786
Level 3 [Member] | Estimate Fair Value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net LHFI		9,465,548	9,235,674
Acquired loans	[1]	$ 0	$ 71,786

[1] Upon adoption of FASB ASC Topic 326 at January 1, 2020, Trustmark elected to account for its existing acquired loans as purchased credit deteriorated loans included within the LHFI portfolio.  See Note 4 – Acquired Loans for additional details.

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Derivative Financial Instruments - Effects of Derivative Instruments on Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivatives in Hedging Relationships [Member] | Accumulated Other Comprehensive Income (Loss) and Other Interest Expense [Member]
Derivatives, Fair Value [Line Items]
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) and recognized in other interest expense		$ 171
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	$ 33,486	4,853
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	$ (1,660)	$ (256)

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Segment Information - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net interest income	$ 103,952	$ 104,808
Provision for credit losses	20,581	1,689
Noninterest income	65,264	41,491
Noninterest expense	123,810	106,021
Income Before Income Taxes	24,825	38,589
Income taxes	2,607	5,250
Net Income	22,218	33,339
Selected Financial Information
Total assets	14,019,829	13,478,017	$ 13,497,877
Depreciation and amortization	8,996	9,337
General Banking [Member]
Segment Reporting Information [Line Items]
Net interest income	102,403	103,005
Provision for credit losses	18,374	1,693
Noninterest income	45,176	22,913
Noninterest expense	106,450	90,015
Income Before Income Taxes	22,755	34,210
Income taxes	2,091	4,155
Net Income	20,664	30,055
Selected Financial Information
Total assets	13,663,877	13,077,106
Depreciation and amortization	8,794	9,139
Wealth Management [Member]
Segment Reporting Information [Line Items]
Net interest income	1,504	1,748
Provision for credit losses	2,207	(4)
Noninterest income	8,516	7,703
Noninterest expense	8,516	7,663
Income Before Income Taxes	(703)	1,792
Income taxes	(176)	444
Net Income	(527)	1,348
Selected Financial Information
Total assets	280,181	329,319
Depreciation and amortization	67	69
Insurance [Member]
Segment Reporting Information [Line Items]
Net interest income	45	55
Noninterest income	11,572	10,875
Noninterest expense	8,844	8,343
Income Before Income Taxes	2,773	2,587
Income taxes	692	651
Net Income	2,081	1,936
Selected Financial Information
Total assets	75,771	71,592
Depreciation and amortization	$ 135	$ 129

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Fair Value

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Fair Value

Note 17 – 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 market place.

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 as of March 31, 2020 and December 31, 2019, 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 three months ended March 31, 2020 and the year ended December 31, 2019.

	March 31, 2020
	Total		Level 1		Level 2		Level 3
U.S. Government agency obligations	$	21,190	$	—	$	21,190	$	—
Obligations of states and political subdivisions		23,572		—		23,572		—
Mortgage-backed securities		1,789,017		—		1,789,017		—
Securities available for sale		1,833,779		—		1,833,779		—
Loans held for sale		325,389		—		325,389		—
Mortgage servicing rights		56,437		—		—		56,437
Other assets - derivatives		72,664		21,575		41,263		9,826
Other liabilities - derivatives		12,624		221		12,403		—

	December 31, 2019
	Total		Level 1		Level 2		Level 3
U.S. Government agency obligations	$	22,327	$	—	$	22,327	$	—
Obligations of states and political subdivisions		25,465		—		25,465		—
Mortgage-backed securities		1,554,612		—		1,554,612		—
Securities available for sale		1,602,404		—		1,602,404		—
Loans held for sale		226,347		—		226,347		—
Mortgage servicing rights		79,394		—		—		79,394
Other assets - derivatives		17,956		244		16,273		1,439
Other liabilities - derivatives		6,063		4,414		1,649		—

The changes in Level 3 assets measured at fair value on a recurring basis for the three months ended March 31, 2020 and 2019 are summarized as follows ($ in thousands):

	MSR			Other Assets - Derivatives
Balance, January 1, 2020	$	79,394		$	1,439
Total net (loss) gain included in Mortgage banking, net (1)		(26,606	)		9,606
Additions		3,649			—
Sales		—			(1,219	)
Balance, March 31, 2020	$	56,437		$	9,826
The amount of total gains (losses) for the period included in earnings    that are attributable to the change in unrealized gains or    losses still held at March 31, 2020	$	(23,999	)	$	4,428
Balance, January 1, 2019	$	95,596		$	1,187
Total net (loss) gain included in Mortgage banking, net (1)		(11,261	)		1,574
Additions		2,507			—
Sales		—			(996	)
Balance, March 31, 2019	$	86,842		$	1,765
The amount of total gains (losses) for the period included in    earnings that are attributable to the change in unrealized    gains or losses still held at March 31, 2019	$	(8,863	)	$	382

(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 March 31, 2020, 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 March 31, 2020, Trustmark had outstanding balances of $39.8 million with a related ACL of $2.4 million in collateral-dependent LHFI.  At December 31, 2019, Trustmark had outstanding balances of $41.2 million with a related allowance of $5.5 million in impaired LHFI that were individually evaluated for impairment and written down to the fair value of the underlying collateral less cost to sell based on the fair value of the collateral or other unobservable input compared.  Both the collateral-dependent LHFI and the individually evaluated impaired 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 carried at the lower of cost or estimated fair value.  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 $3.1 million were remeasured during the first three months of 2020, requiring write-downs of $357 thousand to reach their current fair values compared to $5.7 million of foreclosed assets that were remeasured during the first three months of 2019, requiring write-downs of $990 thousand.

Fair Value of Financial Instruments

FASB ASC Topic 825, “Financial Instruments,” requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring basis or non-recurring basis.

The carrying amounts and estimated fair values of financial instruments at March 31, 2020 and December 31, 2019, are as follows ($ in thousands):

	March 31, 2020				December 31, 2019
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Financial Assets:
Level 2 Inputs:
Cash and short-term investments	$	406,341	$	406,341	$	358,916	$	358,916
Securities held to maturity		704,276		731,441		738,099		746,202
Level 3 Inputs:
Net LHFI		9,467,356		9,465,548		9,251,351		9,235,674
Net acquired loans (1)		—		—		71,786		71,786
Financial Liabilities:
Level 2 Inputs:
Deposits		11,575,764		11,584,178		11,245,557		11,250,071
Federal funds purchased and securities sold under    repurchase agreements		421,821		421,821		256,020		256,020
Other borrowings		84,230		84,227		85,396		85,374
Junior subordinated debt securities		61,856		46,392		61,856		50,722

(1) Upon adoption of FASB ASC Topic 326 at January 1, 2020, Trustmark elected to account for its existing acquired loans as purchased credit deteriorated loans included within the LHFI portfolio.  See Note 4 – Acquired Loans for additional details.

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 months ended March 31, 2020, a net gain of $7.7 million was recorded as noninterest income in mortgage banking, net for changes in the fair value of LHFS accounted for under the fair value option, compared to a net gain of $668 thousand for the three months ended March 31, 2019.  Interest and fees on LHFS and LHFI for the three months ended March 31, 2020 included $1.3 million of interest earned on LHFS accounted for under the fair value option, compared to $1.0 million for the three months ended March 31, 2019, 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 $56.5 million and $57.1 million at March 31, 2020 and December 31, 2019, respectively, and are included in LHFS on the accompanying consolidated balance sheets.  For additional information regarding GNMA optional repurchase loans, please see the section captioned “Past Due LHFS” included in Note 3 – LHFI and Allowance for Credit Losses, LHFI.

The following table provides information about the fair value and the contractual principal outstanding of LHFS accounted for under the fair value option as of March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020		December 31, 2019
Fair value of LHFS	$	268,891	$	169,285
LHFS contractual principal outstanding		256,314		164,420
Fair value less unpaid principal	$	12,577	$	4,865

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Contingencies

3 Months Ended

Mar. 31, 2020

Commitments And Contingencies Disclosure [Abstract]

Contingencies

Note 13 – 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 March 31, 2020 and 2019, Trustmark had unused commitments to extend credit of $4.219 billion and $4.011 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 March 31, 2020 and 2019, Trustmark’s maximum exposure to credit loss in the event of nonperformance by the other party for letters of credit was $106.9 million and $106.5 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 March 31, 2020 and 2019, the fair value of collateral held was $25.8 million and $30.0 million, respectively.

Trustmark adopted FASB ASC Topic 326, effective January 1, 2020, which requires Trustmark to estimate expected credit losses for off-balance sheet credit exposures which are not unconditionally cancellable.  Trustmark maintains a separate ACL on off-balance sheet credit exposures, including unfunded loan commitments and letters of credit, which is included on the accompanying consolidated balance sheet as of March 31, 2020.  

Expected credit losses for off-balance sheet credit exposures are estimated by calculating a commitment usage factor over the contractual period for exposures that are not unconditionally cancellable by Trustmark.  Trustmark generates a loan pool level unfunded amount for the period.  Trustmark views the loan pools as either closed-ended or open-ended.  Closed-ended loan pools are those that typically fund up to 100% such as other construction and nonowner-occupied.  Open-ended loan pools are those that behave similar to a revolver such as the commercial and industrial and home equity line of credit loan pools.  In addition to the unfunded balances, Trustmark uses a funding rate for loan pools that are considered open-ended.  Trustmark calculates the funding rate of the open-ended loan pools each period.  In order to mitigate volatility and incorporate historical experience in the funding rate, Trustmark uses a twelve-quarter moving average.  For the closed-ended loan pools, Trustmark takes a conservative approach and uses a 100% funding rate.  The funding rate is applied to the pool unfunded commitment balances to ensure that reserves will be applied to the pool as Trustmark believes the pool will reach its historical levels.  In addition to the funding rate being applied to the unfunded commitment balance, the total reserve rate is applied.  The total reserve rate incorporates both quantitative and qualitative aspects of the current period’s expected credit loss rate.  The total reserve rate is loan pool specific and is applied to the unfunded amount to ensure loss factors, both quantitative and qualitative, are being considered on the unfunded portion of the loan pool, consistent with the methodology applied to the funded loan pools.  

Changes in the ACL on off-balance sheet credit exposures were as follows for the period presented ($ in thousands):

	Three Months Ended
	March 31, 2020
Balance at beginning of period	$	—
FASB ASU 2016-13 adoption adjustment		29,638
Credit loss expense related to off-balance sheet credit exposures		6,783
Balance at end of period	$	36,421

Adjustments to the ACL on off-balance sheet credit exposures are recorded to credit loss expense related to off-balance sheet credit exposures in noninterest expense.  The increase in the ACL on off-balance sheet credit exposures for the first quarter of 2020 was primarily due to net changes in the economic forecast due to the negative effects of the COVID-19 pandemic on the overall economy and macroeconomic factors used in the quantitative calculation of the ACL.

No credit loss estimate is reported for off-balance sheet credit exposures that are unconditionally cancellable by Trustmark or for undrawn amounts under such arrangements that may be drawn prior to the cancellation of the arrangement.

Legal Proceedings

Trustmark’s wholly-owned subsidiary, TNB, has been named as a defendant in several lawsuits related to the collapse of the Stanford Financial Group.  

On August 23, 2009, a purported class action complaint was filed in the District Court of Harris County, Texas, by Peggy Roif Rotstain, Guthrie Abbott, Catherine Burnell, Steven Queyrouze, Jaime Alexis Arroyo Bornstein and Juan C. Olano (collectively, Class Plaintiffs), on behalf of themselves and all others similarly situated, naming TNB and four other financial institutions and one individual, each of which are unaffiliated with Trustmark, as defendants.  The complaint seeks to recover (i) alleged fraudulent transfers from each of the defendants in the amount of fees and other monies received by each defendant from entities controlled by R. Allen Stanford (collectively, the Stanford Financial Group) and (ii) damages allegedly attributable to alleged conspiracies by one or more of the defendants with the Stanford Financial Group to commit fraud and/or aid and abet fraud on the asserted grounds that defendants knew or should have known the Stanford Financial Group was conducting an illegal and fraudulent scheme.  Class Plaintiffs have demanded a jury trial.  Class Plaintiffs did not quantify damages.

In November 2009, the lawsuit was removed to federal court by certain defendants and then transferred by the United States Panel on Multidistrict Litigation to federal court in the Northern District of Texas (Dallas) where multiple Stanford related matters are being consolidated for pre-trial proceedings.  In May 2010, all defendants (including TNB) filed motions to dismiss the lawsuit.  In August 2010, the court authorized and approved the formation of an Official Stanford Investors Committee (OSIC) to represent the interests of Stanford investors and, under certain circumstances, to file legal actions for the benefit of Stanford investors.  In December 2011, the OSIC filed a motion to intervene in this action.  In September 2012, the district court referred the case to a magistrate judge for hearing and determination of certain pretrial issues.  In December 2012, the court granted the OSIC’s motion to intervene, and the OSIC filed an Intervenor Complaint against one of the other defendant financial institutions.  In February 2013, the OSIC filed a second Intervenor Complaint that asserts claims against TNB and the remaining defendant financial institutions.  The OSIC seeks to recover: (i) alleged fraudulent transfers in the amount of the fees each of the defendants allegedly received from Stanford Financial Group, the profits each of the defendants allegedly made from Stanford Financial Group deposits, and other monies each of the defendants allegedly received from Stanford Financial Group; (ii) damages attributable to alleged conspiracies by each of the

defendants with the Stanford Financial Group to commit fraud and/or aid and abet fraud and conversion on the asserted grounds that the defendants knew or should have known the Stanford Financial Group was conducting an illegal and fraudulent scheme; and (iii) punitive damages.  The OSIC did not quantify damages.  

In July 2013, all defendants (including TNB) filed motions to dismiss the OSIC’s claims.  In March 2015, the court entered an order authorizing the parties to conduct discovery regarding class certification, staying all other discovery and setting a deadline for the parties to complete briefing on class certification issues.  In April 2015, the court granted in part and denied in part the defendants’ motions to dismiss the Class Plaintiffs’ claims and the OSIC’s claims.  The court dismissed all of the Class Plaintiffs’ fraudulent transfer claims and dismissed certain of the OSIC’s claims.  The court denied the motions by TNB and the other financial institution defendants to dismiss the OSIC’s constructive fraudulent transfer claims.  

On June 23, 2015, the court allowed the Class Plaintiffs to file a Second Amended Class Action Complaint (SAC), which asserted new claims against TNB and certain of the other defendants for (i) aiding, abetting and participating in a fraudulent scheme, (ii) aiding, abetting and participating in violations of the Texas Securities Act, (iii) aiding, abetting and participating in breaches of fiduciary duty, (iv) aiding, abetting and participating in conversion and (v) conspiracy.  On July 14, 2015, the defendants (including TNB) filed motions to dismiss the SAC and to reconsider the court’s prior denial to dismiss the OSIC’s constructive fraudulent transfer claims against TNB and the other financial institutions that are defendants in the action.  On July 27, 2016, the court denied the motion by TNB and the other financial institution defendants to dismiss the SAC and also denied the motion by TNB and the other financial institution defendants to reconsider the court’s prior denial to dismiss the OSIC’s constructive fraudulent transfer claims.  On August 24, 2016, TNB filed its answer to the SAC.  On October 20, 2017, the OSIC filed a motion seeking an order lifting the discovery stay and establishing a trial schedule.  On November 4, 2016, the OSIC filed a First Amended Intervenor Complaint, which added claims for (i) aiding, abetting or participation in violations of the Texas Securities Act and (ii) aiding, abetting or participation in the breach of fiduciary duty.  On November 7, 2017, the court denied the Class Plaintiffs’ motion seeking class certification and designation of class representatives and counsel, finding that common issues of fact did not predominate.  The court granted the OSIC’s motion to lift the discovery stay that it had previously ordered.

On May 3, 2019, individual investors and entities filed motions to intervene in the action.  On September 18, 2019, the court denied the motions to intervene.  On October 14, 2019, certain of the proposed intervenors filed a notice of appeal.

On December 14, 2009, a different Stanford-related lawsuit was filed in the District Court of Ascension Parish, Louisiana, individually by Harold Jackson, Paul Blaine and Carolyn Bass Smith, Christine Nichols, and Ronald and Ramona Hebert naming TNB (misnamed as Trust National Bank) and other individuals and entities not affiliated with Trustmark as defendants.  The complaint seeks to recover the money lost by these individual plaintiffs as a result of the collapse of the Stanford Financial Group (in addition to other damages) under various theories and causes of action, including negligence, breach of contract, breach of fiduciary duty, negligent misrepresentation, detrimental reliance, conspiracy, and violation of Louisiana’s uniform fiduciary, securities, and racketeering laws.  The complaint does not quantify the amount of money the plaintiffs seek to recover.  In January 2010, the lawsuit was removed to federal court by certain defendants and then transferred by the United States Panel on Multidistrict Litigation to federal court in the Northern District of Texas (Dallas) where multiple Stanford related matters are being consolidated for pre-trial proceedings.  On March 29, 2010, the court stayed the case.  TNB filed a motion to lift the stay, which was denied on February 28, 2012.  In September 2012, the district court referred the case to a magistrate judge for hearing and determination of certain pretrial issues.

On April 11, 2016, Trustmark learned that a different Stanford-related lawsuit had been filed on that date in the Superior Court of Justice in Ontario, Canada, by The Toronto-Dominion Bank (“TD Bank”), naming TNB and three other financial institutions not affiliated with Trustmark as defendants.  The 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 a 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.  To date, TNB has not been served in connection with this action.

On November 1, 2019, TNB was named as a defendant in a complaint filed by Paul Blaine Smith, Carolyn Bass Smith and other plaintiffs identified therein (the Smith Complaint).  The Smith Complaint was filed in District Court, Harris County, Texas and named TNB and four other financial institutions and one individual, each of which are unaffiliated with Trustmark, as defendants.  The Smith Complaint relates to the collapse of the Stanford Financial Group, as does the other pending litigation relating to Stanford summarized above.  Plaintiffs in the Smith Complaint have demanded a jury trial.

On January 15, 2020, the court granted Stanford Financial Group receiver’s motion to stay the state court action. On February 26, 2020, the lawsuit was removed to federal court in the Southern District of Texas by TNB.  Trustmark and its counsel are carefully

evaluating the Smith Complaint in the form that is publicly available, and will update the foregoing description to the extent that additional material facts are ascertained.

TNB’s relationship with the Stanford Financial Group began as a result of Trustmark’s acquisition of a Houston-based bank in August 2006, and consisted of correspondent banking and other traditional banking services in the ordinary course of business.  All Stanford-related lawsuits are in pre-trial stages.

On December 30, 2019, a complaint was filed in the United States District Court for the Southern District of Mississippi, Northern Division (the Court) by Alysson Mills in her capacity as Court-appointed Receiver (the Receiver) for Arthur Lamar Adams (Adams) and Madison Timber Properties, LLC (Madison Timber), naming TNB, two other Mississippi-based financial institutions both of which are unaffiliated with Trustmark and two individuals, one of who was employed by TNB at all times relevant to the complaint and the other was employed either by TNB or one of the other defendant financial institutions, as defendants.  The complaint seeks to recover from the defendants, for the benefit of the receivership estate and also for certain investors who were allegedly defrauded by Adams and Madison Timber, damages (including punitive damages) and related costs allegedly attributable to actions of the defendants that allegedly enabled illegal and fraudulent activities engaged in by Adams and Madison Timber.  The Receiver did not quantify damages.

TNB’s relationship with Adams and Madison Timber consisted of traditional banking services in the ordinary course of business.

Trustmark and its subsidiaries are also parties to other lawsuits and other claims that arise in the ordinary course of business.  Some of the lawsuits assert claims related to the lending, collection, servicing, investment, trust and other business activities, and some of the lawsuits allege substantial claims for damages.

All pending legal proceedings described above are being vigorously contested.  In accordance with FASB ASC Subtopic 450-20, “Loss Contingencies,” Trustmark will establish an accrued liability for litigation matters when those matters present loss contingencies that are both probable and reasonably estimable.  At the present time, Trustmark believes, based on its evaluation and the advice of legal counsel, that a loss in any such proceeding is not probable and a reasonable estimate cannot reasonably be made.

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Accounting Policies Recently Adopted and Pending Accounting Pronouncements (Policies)

3 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

Credit Loss, Financial Instrument

In order to comply with ASU 2016-13, Trustmark conducted a review of its investment portfolio and determined that for certain classes of securities it would be appropriate to assume the expected credit loss to be zero.  This zero-credit loss assumption applies to debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government.  The reasons behind the adoption of the zero-credit loss assumption are as follows:

• High credit rating

• Long history with no credit losses

• Guaranteed by a sovereign entity

• Widely recognized as “risk-free rate”

• Can print its own currency

• Currency is routinely held by central banks, used in international commerce, and commonly viewed as reserve currency

• Currently under the U.S. Government conservatorship or receivership

Trustmark will continuously monitor any changes in economic conditions, credit downgrades, changes to explicit or implicit guarantees granted to certain debt issuers, and any other relevant information that would indicate potential credit deterioration and prompt Trustmark to reconsider its zero-credit loss assumption.

Securities Available for Sale

Securities Available for Sale

ASU 2016-13 makes targeted improvements to the accounting for credit losses on securities available for sale.  The concept of other-than-temporarily impaired has been replaced with the allowance for credit losses.  Unlike securities held to maturity, securities available for sale are evaluated on an individual level and pooling of securities is not allowed.  

Quarterly, Trustmark evaluates if any security has a fair value less than its amortized cost.  Once these securities are identified, in order to determine whether a decline in fair value resulted from a credit loss or other factors, Trustmark performs further analysis as outlined below:

• Review the extent to which the fair value is less than the amortized cost and observe the security’s lowest credit rating as reported by third-party credit ratings companies.

• The securities that violate the credit loss triggers above would be subjected to additional analysis that may include, but is not limited to: changes in market interest rates, changes in securities credit ratings, security type, service area economic factors, financial performance of the issuer/or obligor of the underlying issue and third-party guarantee.

• If Trustmark determines that a credit loss exists, the credit portion of the allowance will be measured using a discounted cash flow (DCF) analysis using the effective interest rate as of the security’s purchase date. The amount of credit loss Trustmark records will be limited to the amount by which the amortized cost exceeds the fair value.

The DCF analysis utilizes contractual maturities, as well as third-party credit ratings and cumulative default rates published annually by Moody’s Investor Service.

At March 31, 2020, the results of the analysis did not identify any securities that violate the credit loss triggers; therefore, no DCF analysis was performed and no credit loss was recognized on any of the securities available for sale.  

Accrued interest receivable is excluded from the estimate of credit losses for securities available for sale.  At March 31, 2020, accrued interest receivable totaled $4.5 million for securities available for sale and was reported in other assets on the accompanying consolidated balance sheet.

Securities Held to Maturity

Securities Held to Maturity

ASU 2016-13 requires institutions to measure expected credit losses on financial assets carried at amortized cost on a collective or pool basis when similar risks exist.  Trustmark uses several levels of segmentation in order to measure expected credit losses:

• The portfolio is segmented into agency and non-agency securities.

• The non-agency securities are separated into municipal, mortgage, and corporate securities.

Each individual segment is categorized by third-party credit ratings.  

As discussed above, Trustmark has determined that for certain classes of securities it would be appropriate to assume the expected credit loss to be zero, which include debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government. This assumption will be reviewed and attested to quarterly.  Trustmark is using an internally built model to verify the accuracy of third-party provided calculations.  

At March 31, 2020, Trustmark’s securities held to maturity totaled $704.3 million.  The potential credit loss exposure was $31.6 million and consisted of municipal securities.  After applying appropriate probability of default and loss given default assumptions, the total amount of current expected credit losses was deemed immaterial.  Therefore, no reserve was recorded at March 31, 2020.  

Accrued interest receivable is excluded from the estimate of credit losses for securities held to maturity.  At March 31, 2020, accrued interest receivable totaled $1.7 million for securities held to maturity and was reported in other assets on the accompanying consolidated balance sheet.

At March 31, 2020, Trustmark had no securities held to maturity that were past due 30 days or more as to principal or interest payments.  Trustmark had no securities held to maturity classified as nonaccrual at March 31, 2020.  

Allowance for Credit Losses, LHFI (ACL)

Allowance for Credit Losses, LHFI (ACL)

Trustmark’s ACL methodology for LHFI is based upon guidance within FASB ASC Subtopic 326-20 as well as regulatory guidance from its primary regulator.  The ACL is a valuation account that is deducted from the loans’ amortized cost basis to present the net amount expected to be collected on the loans.  Credit quality within the LHFI portfolio is continuously monitored by Management and is reflected within the ACL for loans.  The ACL is an estimate of expected losses inherent within Trustmark’s existing LHFI portfolio.  The ACL for LHFI is adjusted through the provision for credit losses (PCL) and reduced by the charge off of loan amounts, net of recoveries.  

The loan loss estimation process involves procedures to appropriately consider the unique characteristics of Trustmark’s LHFI portfolio segments.  These segments are further disaggregated into loan classes, the level at which credit risk is monitored.  When computing allowance levels, credit loss assumptions are estimated using a model that categorizes loan pools based on loss history, delinquency status and other credit trends and risk characteristics, including current conditions and reasonable and supportable forecasts about the future.  Evaluations of the portfolio and individual credits are inherently subjective, as they require estimates, assumptions and judgments as to the facts and circumstances of particular situations.  Determining the appropriateness of the allowance is complex and requires judgement by Management about the effect of matters that are inherently uncertain.  In future periods, evaluations of the overall LHFI portfolio, in light of the factors and forecasts then prevailing, may result in significant changes in the allowance and credit loss expense.

Trustmark estimates the ACL using relevant available information, from internal and external sources, relating to past events, current conditions and reasonable and supportable forecasts including the COVID-19 pandemic effects.  Trustmark uses a third-party software application to calculate the quantitative portion of the ACL using a methodology and assumptions specific to each loan pool.  The qualitative portion of the allowance is based on general economic conditions and other internal and external factors affecting Trustmark as a whole as well as specific LHFI.  Factors considered include the following:  lending policies and procedures, economic

conditions and concentrations of credit, nature and volume of the portfolio, performance trends, and external factors.  The quantitative and qualitative portions of the allowance are added together to determine the total allowance for credit losses, which reflects Management’s expectations of future conditions based on reasonable and supportable forecasts.

The methodology for estimating the amount of expected credit losses reported in the ACL has two basic components: a collective, or pooled, component for estimated expected credit losses for pools of loans that share similar risk characteristics, and an asset-specific component involving individual loans that do not share risk characteristics with other loans and the measurement of expected credit losses for such individual loans.  In estimating the allowance for credit losses for the collective component, loans are segregated into loan pools based on loan product types and similar risk characteristics.

The loans secured by real estate and other loans secured by real estate portfolio segments include loans for both commercial and residential properties.  The underwriting process for these loans includes analysis of the financial position and strength of both the borrower and guarantor, experience with similar projects in the past, market demand and prospects for successful completion of the proposed project within the established budget and schedule, values of underlying collateral, availability of permanent financing, maximum loan-to-value ratios, minimum equity requirements, acceptable amortization periods and minimum debt service coverage requirements, based on property type.  The borrower’s financial strength and capacity to repay their obligations remain the primary focus of underwriting.  Financial strength is evaluated based upon analytical tools that consider historical and projected cash flows and performance in addition to analysis of the proposed project for income-producing properties.  Additional support offered by guarantors is also considered.  Ultimate repayment of these loans is sensitive to interest rate changes, general economic conditions, liquidity and availability of long-term financing.

The commercial and industrial LHFI portfolio segment includes commercial loans 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, equipment and fixed asset purchases that are secured by those assets and term financing for those within Trustmark’s geographic markets.  Trustmark’s credit underwriting process for commercial and industrial loans includes analysis of historical and projected cash flows and performance, evaluation of financial strength of both borrowers and guarantors as reflected in current and detailed financial information and evaluation of underlying collateral to support the credit.

The consumer LHFI portfolio segment is comprised of loans which are underwritten after evaluating a borrower’s capacity, credit and collateral.  Several factors are considered when assessing a borrower’s capacity, including the borrower’s employment, income, current debt, assets and level of equity in the property.  Credit is assessed using a credit report that provides credit scores and the borrower’s current and past information about their credit history.  Property appraisals are obtained to assist in evaluating collateral.  Loan-to-value and debt-to-income ratios, loan amount and lien position are also considered in assessing whether to originate a loan.  These borrowers are particularly susceptible to downturns in economic trends such as conditions that negatively affect housing prices and demand and levels of unemployment.

The state and other political subdivision LHFI and the other commercial LHFI portfolio segments primarily consist of loans to non-depository financial institutions, such as mortgage companies, finance companies and other financial intermediaries, loans to state and political subdivisions, and loans to non-profit and charitable organizations.  These loans are underwritten based on the specific nature or purpose of the loan and underlying collateral with special consideration given to the specific source of repayment for the loan.

The following table provides a description of each of Trustmark’s portfolio segments, loan classes, loan pools and the ACL methodology and loss drivers:

Portfolio Segment	Loan Class	Loan Pool	Methodology	Loss Drivers
Loans secured by real estate	Construction, land    development and other land	1-4 family residential    construction	DCF	Prime Rate, National GDP
		Lots and development	DCF	Prime Rate, Southern Unemployment
		Unimproved land	DCF	Prime Rate, Southern Unemployment
	Other secured by 1-4    family residential    properties	Consumer 1-4 family - 1st liens	DCF	Prime Rate, Southern Unemployment
	Secured by nonfarm,    nonresidential properties	Nonowner-occupied -    hotel/motel	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied - office	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied- Retail	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied - senior    living/nursing homes	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied -    all other	DCF	Southern Vacancy Rate, Southern Unemployment
	Other real estate secured	Nonresidential nonowner    -occupied - apartments	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonresidential owner-occupied	DCF	Southern Unemployment, National GDP
Other loans secured by    real estate	Other construction	Other construction	WARM	Prime Rate, National Unemployment
	Secured by 1-4 family    residential properties	Trustmark mortgage	WARM	Southern Unemployment
Commercial and    industrial loans	Commercial and    industrial loans	Commercial and industrial -    non-working capital	DCF	Trustmark historical data
		Commercial and industrial -    working capital	DCF	Trustmark historical data
Consumer loans	Consumer loans	Credit cards	WARM	Trustmark call report data
		Overdrafts	Loss Rate	Trustmark historical data
		All other consumer	DCF	Prime Rate, Southern Unemployment
State and other political    subdivision loans	State and other political    subdivision loans	Obligations of state and    political subdivisions	DCF	Moody's Bond Default Study
Other commercial loans	Other commercial loans	Other loans	DCF	Prime Rate, Southern Unemployment

In general, Trustmark utilizes a DCF method to estimate the quantitative portion of the allowance for credit losses for loan pools.  The DCF model consists of two key components, a loss driver analysis (LDA) and a cash flow analysis.  For loan pools utilizing the DCF methodology, multiple assumptions are in place, depending on the loan pool.  A reasonable and supportable forecast is utilized for each loan pool by developing a LDA for each loan class.  The LDA uses charge off data from Federal Financial Institutions Examination Council (FFIEC) reports to construct a periodic default rate (PDR).  The PDR is decomposed into a probability of default (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 loss given default (LGD) is derived using a method referred to as Frye Jacobs.  The Frye Jacobs method is a mathematical formula that traces the relationship between LGD and PD over time and projects the LGD based on the levels of PD forecasts. This model approach is applicable to all pools within the construction, land development and other land, other secured by 1-4 family residential properties, secured by nonfarm, nonresidential properties and other real estate secured loan classes as well as the all other consumer and other loans pools.

For the commercial and industrial loans related pools, Trustmark uses its own PD and LGD data, instead of the macroeconomic variables and the Frye Jacobs method described above, to calculate the PD and LGD as there were no defensible macroeconomic variables that correlated to Trustmark’s losses.  Trustmark utilizes a third-party Bond Default Study to derive the PD and LGD for the

obligations of state and political subdivisions pool.  Due to the lack of losses within this pool, no defensible macroeconomic factors were identified to correlate.

The PD and LGD measures are used in conjunction with prepayment data as inputs into the DCF model to calculate the cash flows at the individual loan level.  Contractual cash flows based on loan terms are adjusted for PD, LGD and prepayments to derive loss cash flows.  These loss cash flows are discounted by the loan’s coupon rate to arrive at the discounted cash flow based quantitative loss.  The prepayment studies are updated quarterly by a third-party for each applicable pool.

An alternate method of estimating the ACL is used for certain loan pools due to specific characteristics of these loans.  For the non-DCF pools, specifically, those using the weighted average remaining maturity (WARM) method, the remaining life is incorporated into the ACL quantitative calculation.

Trustmark determined that reasonable and supportable forecasts could be made for a twelve-month period for all of its loan pools.  To the extent the lives of the loans in the LHFI portfolio extend beyond this forecast period, Trustmark uses a reversion period of four quarters and reverts to the historical mean on a straight-line basis over the remaining life of the loans.  For the current period, the forecast related to the macroeconomic variables used in the quantitative modeling process were adversely affected due to the impact of COVID-19, causing an overall increase in reserve levels.  

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 two are currently considered active: economic conditions and concentrations of credit and performance trends.

Two of Trustmark’s largest loan classes are the loans secured by nonfarm, nonresidential properties and the loans secured by other real estate. Trustmark elected to create a qualitative factor specifically for these loan classes which addresses changes in the economic conditions of metropolitan areas and applies additional pool level reserves. This qualitative factor is based on third-party market data and forecast trends and is updated quarterly as information is available, by market and by loan pool.

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 ACL for individual loans that do not share risk characteristics with other loans is measured as the difference between the discounted value of expected future cash flows, based in the effective interest rate at origination, and the amortized cost basis of the loan, or the net realizable value.  The ACL is the difference between the loan’s net realizable value and its amortized cost basis (net of previous charge-offs and deferred loan fees and costs), except for collateral-dependent loans.  A loan is collateral dependent when the borrower is experiencing financial difficulty and repayment of the loan is expected to be provided substantially through the sale of the collateral.  The expected credit loss for collateral-dependent loans is measured as the difference between the amortized cost basis of the loan and the fair value of the collateral, adjusted for the estimated cost to sell.  Fair value estimates for collateral-dependent loans are derived from appraised values based on the current market value or the ‘as is’ value of the collateral, normally from recently received and reviewed appraisals.  Current appraisals are ordered on an annual basis based on the inspection date or more often if market conditions necessitate.  Appraisals are obtained from state-certified appraisers and are based on certain assumptions, which may include construction or development status and the highest and best use of the property.  These appraisals are reviewed by Trustmark’s Appraisal Review Department to ensure they are acceptable, and values are adjusted down for costs associated with asset disposal.  If the calculated expected credit loss is determined to be permanent or not recoverable, the amount of the expected credit loss is charged off.

LHFI are charged off against the ACL, with any subsequent recoveries credited back to the ACL account.  Expected recoveries may not exceed the aggregate of amounts previously charged off and expected to be charged off.  Trustmark’s loan policy dictates the guidelines to be followed in determining when a loan is charged off.  Commercial purpose LHFI are charged off when a determination is made that the loan is uncollectible and continuance as a bankable asset is not warranted.  Consumer LHFI secured by 1-4 family residential real estate are generally charged off or written down to the fair value of the collateral less cost to sell at no later than 180 days of delinquency.  Non-real estate consumer purpose LHFI, including both secured and unsecured loans, are generally charged off

by 120 days of delinquency.  Consumer revolving lines of credit and credit card debt are generally charged off on or prior to 180 days of delinquency.

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 2018-15, “Intangibles-Goodwill and Other–Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force).”  Issued in August 2018, ASU 2018-15 aims to reduce complexity in the accounting for costs of implementing a cloud computing service arrangement.  ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license).  The amendments of ASU 2018-15 require an entity to follow the guidance in FASB ASC Subtopic 350-40, “Intangibles-Goodwill and Other-Internal-Use Software,” in order to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense.  The amendments of ASU 2018-15 also require an entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement (i.e. the noncancellable period of the arrangement plus periods covered by (1) an option to extend the arrangement if the entity is reasonably certain to exercise that option, (2) an option to terminate the arrangement if the entity is reasonably certain not to exercise the option, and (3) an option to extend (or not to terminate) the arrangement in which exercise of the option is in the control of the vendor).  ASU 2018-15 also requires an entity to present the expense related to the capitalized implementation costs in the same line item in the statement of income as the fees associated with the hosting element (service) of the arrangement, and to classify payments for capitalized implementation costs in the statement of cash flows in the same manner as payments made for fees associated with the hosting element.  ASU 2018-15 became effective for Trustmark on January 1, 2020.  Trustmark does not currently have any material amount of implementation costs related to hosting arrangements that are service contracts within the scope of this ASU; therefore, adoption of ASU 2018-15 did not impact Trustmark’s consolidated financial statements.

ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement.”  Issued in August 2018, the amendments in this ASU remove disclosure requirements in FASB ASC Topic 820 related to (1) the amount of, and reasons for, transfers between Level 1 and Level 2 of the fair value hierarchy; (2) the policy for timing of transfers between levels; (3) the valuation processes for Level 3 fair value measurements; and (4) for non-public entities, the changes in unrealized gains and losses for the period included in earnings for recurring Level 3 fair value measurements held at the end of the reporting period. The ASU also modifies disclosure requirements such that (1) in place of a rollforward for Level 3 fair value measurements, a non-public entity is required to disclose transfers into and out of Level 3 of the fair value hierarchy and purchases and issues of Level 3 assets and liabilities; (2) for investments in certain entities that calculate net asset value, an entity is required to disclose the timing of liquidation of an investee’s assets and the date that restrictions from redemption might lapse, only if the investee has communicated the timing to the entity or announced the timing publicly; and (3) it is clear that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date.  Additionally, this ASU adds disclosure requirements for public entities about (1) the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period, and (2) the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements.  The amendments of ASU 2018-13 became effective for Trustmark on January 1, 2020. Adoption of ASU 2018-13 did not have a material impact on Trustmark’s consolidated financial statements.  Disclosures required by FASB ASC Topic 820 are presented in Note 17 – Fair Value, of this report.

ASU 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.”  Issued in January 2017, ASU 2017-04 simplifies the manner in which an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test.  Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit's goodwill with the carrying amount of that goodwill.  In computing the implied fair value of goodwill under Step 2, an entity, prior to the amendments in ASU 2017-04, had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities, including unrecognized assets and liabilities, in accordance with the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination.  However, under the amendments in ASU 2017-04, an entity should (1) perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and (2) recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value, with the understanding that the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit.  Additionally, ASU 2017-04 removes the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails such qualitative test, to perform Step 2 of the goodwill impairment test.  ASU 2017-04 became effective for Trustmark on January 1, 2020, and the amendments of this ASU will be applicable to the annual goodwill impairment

test performed as of October 1, 2020.  Based on Trustmark’s annual goodwill impairment test performed as of October 1, 2019, the fair value of its reporting units exceeded the carrying value and, therefore, the related goodwill was not impaired.  

ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.”  Issued in June 2016, ASU 2016-13 will add FASB ASC Topic 326, “Financial Instruments-Credit Losses” and finalizes amendments to FASB ASC Subtopic 825-15, “Financial Instruments-Credit Losses.”  The amendments of ASU 2016-13 are intended to provide financial statement users with more decision-useful information related to expected credit losses on financial instruments and other commitments to extend credit by replacing the current incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates.  The amendments of ASU 2016-13 eliminate the probable initial recognition threshold and, in turn, reflect an entity’s current estimate of all expected credit losses.  ASU 2016-13 does not specify the method for measuring expected credit losses, and an entity is allowed to apply methods that reasonably reflect its expectations of the credit loss estimate.  Additionally, the amendments of ASU 2016-13 require that credit losses on available for sale debt securities be presented as an allowance rather than as a write-down.  The amendments of ASU 2016-13, and all subsequent ASUs issued by FASB to provide additional guidance and clarification related to this Topic, became effective for Trustmark on January 1, 2020.  

As previously disclosed, Trustmark established a cross-functional Current Expected Credit Loss (CECL) Steering Committee, a CECL Solution Development Working Group and a CECL Working Group which included the appropriate members of Management to evaluate the impact this ASU, and all subsequent ASUs issued by FASB, will have on Trustmark’s financial position, results of operations and financial statement disclosures and determine the most appropriate method of implementing the amendments in these ASUs as well as any resources needed to implement the amendments.  Trustmark selected a third-party vendor to provide allowance for loan loss software as well as advisory services in developing a new methodology that would be compliant with amendments of ASU 2016-13.

In accordance with the amendments of ASU 2016-13, Trustmark elected to maintain pools of loans that were previously accounted for under FASB ASC Subtopic 310-30 and will continue to account for these pools as a unit of account.  Loans are only removed from the existing loan pools if they are written off, paid off or sold.  Upon adoption of ASU 2016-13, the allowance for credit losses was determined for each pool and added to the pool’s carrying value to establish a new amortized cost basis.  The difference between the unpaid principle balance of the pool and the new amortized cost basis is the noncredit premium or discount which will be amortized into interest income over the remaining life of the pool.

As a result of adopting the amendments of ASU 2016-13, Trustmark recorded a decrease to its ACL LHFI of $3.0 million and an increase to its ACL on off-balance sheet credit exposures of $29.6 million resulting in a one-time cumulative effect adjustment through retained earnings of $26.6 million ($19.9 million, net of tax) at the date of adoption.  This adjustment included a qualitative adjustment to the allowance for credit losses related to loans and an allowance on off-balance sheet credit exposures.  Trustmark estimates losses over an approximate one-year forecast period using Moody’s baseline economic forecasts, and then reverts to longer term historical loss experience over a one-year period.  

Trustmark’s estimated allowance for credit losses on both held to maturity securities and available for sale securities under the CECL model was deemed immaterial due to the composition of the portfolios being primarily government agency-backed securities for which the risk of loss is minimal.  Therefore, Trustmark did not recognize a cumulative effective adjustment through retained earnings at the date of adoption related to the held to maturity or available for sale securities.

Disclosures required by the amendments ASU 2016-13 are presented in Note 2 – Securities Available for Sale and Held to Maturity and Note 3 – Loans Held for Investment and Allowance for Credit Losses, of this report.

Pending Accounting Pronouncements

ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.”  Issued in March 2020, ASU 2020-04 seeks to provided additional guidance, for a limited time, to ease the potential burden in accounting for or recognizing the effects of reference rate reform on financial reporting.  The FASB issued ASU 2020-04 is response to concerns about the structural risks of interbank offered rates (IBORs) and, in particular, the risk that the London Interbank Offer Rate (LIBOR) will no longer be used.  Regulators have begun reference rate reform initiatives to identify alternative reference rates that are more observable or transaction-based and less susceptible to manipulation.  Stakeholders have raised operational challenges likely to arise with the reference rate reform, particularly related to contract modifications and hedge accounting.  The amendments of ASU 2020-04, which are elective and apply to all entities, provide expedients and exceptions for applying GAAP to contract modifications and hedging relationships affected by the reference rate reform id certain criteria are met.  The amendments apply only to contracts and hedging relationships that reference LIBOR or another reference rate that is expected to be discontinued due to reference rate reform.  The optional expedients for contract modifications should be applied consistently for all contracts or

transactions within the relevant Codification Topic or Subtopic or Industry Subtopic that contains the related guidance.  The optional expedients for hedging relationships can be elected on an individual hedging relationship basis.  As the guidance in ASU 2020-04 is intended to assist entity’s during the global market-wide reference rate transition period, it is in effect for a limited time, from March 12, 2020 through December 31, 2022.  Management is currently evaluating the impact to Trustmark as a result of the potential discontinuance of LIBOR, and a determination cannot be made at this time as to the impact the amendments of ASU 2020-04 or the reference rate reform will have on its consolidated financial statements.

ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.”  Issued in December 2019, ASU 2019-12 seeks to simplify the accounting for income taxes by removing certain exceptions to the general principles in FASB ASC Topic 740, Income Taxes.  In particular, the amendments of ASU 2019-12 remove the exceptions to (1) the incremental approach for intra-period tax allocation when there is a loss from continuing operations and income or a gain from other items (e.g., discontinued operations or other comprehensive income); (2) the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment; (3) the ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary; and (4) the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year.  The amendments of ASU 2019-12 (1) require that an entity recognize a franchise tax (or similar tax), that is partially based on income, in accordance with FASB ASC Topic 740 and account for any incremental amount incurred as a non-income-based tax; (2) require that an entity evaluate when a step up in the tax basis of goodwill should be considered part of the business combination in which the book goodwill was originally recognized and when it should instead be considered a separate transaction; (3) specify that an entity is not required to allocate the consolidated amount of current and deferred tax expense to a legal entity that is not subject to tax in its separate financial statements, but rather may elect to do so for a legal entity that is both not subject to tax and disregarded by the taxing authority; and (4) require that an entity reflect the effect of an enacted change in tax laws or rates in the annual effective tax rate computation in the interim period that includes the enactment date.  ASU 2019-12 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020.  Early adoption of ASU 2019-12 is permitted, including adoption in any interim period for periods for which financial statements have not yet been issued.  An entity that elects to early adopt the amendments in an interim period should reflect any adjustments as of the beginning of the annual period that includes that interim period.  Additionally, an entity that elects early adoption must adopt all the amendments in the same period.  The amendments related to separate financial statements of legal entities that are not subject to tax should be applied on a retrospective basis for all periods presented.  The amendments related to changes in ownership of foreign equity method investments or foreign subsidiaries should be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption.  The amendments related to franchise taxes that are partially based on income should be applied on either a retrospective basis for all periods presented or a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption.  All other amendments should be applied on a prospective basis.  Trustmark intends to adopt the amendments in ASU 2019-12 during the first quarter of 2021.  Adoption of ASU 2019-12 is not expected to have a material impact to Trustmark’s consolidated financial statements.

ASU 2018-14, “Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans.”  Issued in August 2018, ASU 2018-14 modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans.  The amendments in ASU 2018-14 remove certain disclosure requirements that are no longer considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant.  The amendments of ASU 2018-14 become effective for fiscal years beginning after December 15, 2020.  Trustmark plans to adopt these amendments during the first quarter of 2021.  Management is currently assessing all the potential impacts of the amendments in ASU 2018-14 on Trustmark’s consolidated financial statements; however, the adoption of ASU 2018-14 is not expected to have a material impact on Trustmark’s consolidated financial statements.

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Contingencies (Tables)

3 Months Ended

Mar. 31, 2020

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 period presented ($ in thousands):

	Three Months Ended
	March 31, 2020
Balance at beginning of period	$	—
FASB ASU 2016-13 adoption adjustment		29,638
Credit loss expense related to off-balance sheet credit exposures		6,783
Balance at end of period	$	36,421

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Fair Value (Tables)

3 Months Ended

Mar. 31, 2020

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 as of March 31, 2020 and December 31, 2019, 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 three months ended March 31, 2020 and the year ended December 31, 2019.

	March 31, 2020
	Total		Level 1		Level 2		Level 3
U.S. Government agency obligations	$	21,190	$	—	$	21,190	$	—
Obligations of states and political subdivisions		23,572		—		23,572		—
Mortgage-backed securities		1,789,017		—		1,789,017		—
Securities available for sale		1,833,779		—		1,833,779		—
Loans held for sale		325,389		—		325,389		—
Mortgage servicing rights		56,437		—		—		56,437
Other assets - derivatives		72,664		21,575		41,263		9,826
Other liabilities - derivatives		12,624		221		12,403		—

	December 31, 2019
	Total		Level 1		Level 2		Level 3
U.S. Government agency obligations	$	22,327	$	—	$	22,327	$	—
Obligations of states and political subdivisions		25,465		—		25,465		—
Mortgage-backed securities		1,554,612		—		1,554,612		—
Securities available for sale		1,602,404		—		1,602,404		—
Loans held for sale		226,347		—		226,347		—
Mortgage servicing rights		79,394		—		—		79,394
Other assets - derivatives		17,956		244		16,273		1,439
Other liabilities - derivatives		6,063		4,414		1,649		—

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 three months ended March 31, 2020 and 2019 are summarized as follows ($ in thousands):

	MSR			Other Assets - Derivatives
Balance, January 1, 2020	$	79,394		$	1,439
Total net (loss) gain included in Mortgage banking, net (1)		(26,606	)		9,606
Additions		3,649			—
Sales		—			(1,219	)
Balance, March 31, 2020	$	56,437		$	9,826
The amount of total gains (losses) for the period included in earnings    that are attributable to the change in unrealized gains or    losses still held at March 31, 2020	$	(23,999	)	$	4,428
Balance, January 1, 2019	$	95,596		$	1,187
Total net (loss) gain included in Mortgage banking, net (1)		(11,261	)		1,574
Additions		2,507			—
Sales		—			(996	)
Balance, March 31, 2019	$	86,842		$	1,765
The amount of total gains (losses) for the period included in    earnings that are attributable to the change in unrealized    gains or losses still held at March 31, 2019	$	(8,863	)	$	382

(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 March 31, 2020 and December 31, 2019, are as follows ($ in thousands):

	March 31, 2020				December 31, 2019
	Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
Financial Assets:
Level 2 Inputs:
Cash and short-term investments	$	406,341	$	406,341	$	358,916	$	358,916
Securities held to maturity		704,276		731,441		738,099		746,202
Level 3 Inputs:
Net LHFI		9,467,356		9,465,548		9,251,351		9,235,674
Net acquired loans (1)		—		—		71,786		71,786
Financial Liabilities:
Level 2 Inputs:
Deposits		11,575,764		11,584,178		11,245,557		11,250,071
Federal funds purchased and securities sold under    repurchase agreements		421,821		421,821		256,020		256,020
Other borrowings		84,230		84,227		85,396		85,374
Junior subordinated debt securities		61,856		46,392		61,856		50,722

(1) Upon adoption of FASB ASC Topic 326 at January 1, 2020, Trustmark elected to account for its existing acquired loans as purchased credit deteriorated loans included within the LHFI portfolio.  See Note 4 – Acquired Loans for additional details.

Fair Value and the Contractual Principal Outstanding of the LHFS

The following table provides information about the fair value and the contractual principal outstanding of LHFS accounted for under the fair value option as of March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020		December 31, 2019
Fair value of LHFS	$	268,891	$	169,285
LHFS contractual principal outstanding		256,314		164,420
Fair value less unpaid principal	$	12,577	$	4,865

XML

Securities Available for Sale and Held to Maturity - Additional Information (Details) - USD ($)		3 Months Ended
	Jan. 01, 2020	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2013
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities held to maturity		$ 704,276,000		$ 738,099,000
Potential credit loss exposure		31,600,000
Reclassification of Securities available for sale to securities held to maturity					$ 1,099,000,000.000
Net unrealized holding loss on AFS Securities at date of transfer					46,600,000
Net unrealized holding losses on AFS Securities, net of tax at date of transfer					$ 28,800,000
Net unamortized, unrealized loss on transfer of securities		11,200,000		12,100,000
Net unamortized, unrealized loss on transfer of securities, net of tax		8,400,000		9,100,000
Other-than-temporary impairments			$ 0
Pledged to collateralize public deposits and securities sold under repurchase agreements and for other purposes as permitted by law		1,924,000,000		1,770,000,000
Pledged securities providing additional contingency funding		0		$ 0
30 Days or More Past Due [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Held-to-maturity, past due		0
Securities Available for Sale [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Accrued interest receivable		4,500,000
Securities Held to Maturity [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Accrued interest receivable		1,700,000
Reserve for credit loss		0
Held-to-maturity nonnaccrual		0
ASU 2016-13 [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Cumulative effect adjustment through retained earnings	$ 19,900,000
Securities held to maturity		704,300,000
ASU 2016-13 [Member] | Securities Available for Sale [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Expected credit loss		0
Cumulative effect adjustment through retained earnings	0
ASU 2016-13 [Member] | Securities Held to Maturity [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Cumulative effect adjustment through retained earnings	$ 0
Current expected credit loss		$ 0

XML

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Summary of Trustmark's Portfolio Segments, Loan Classes, Loan Pools and the ACL Methodology and Loss Drivers (Details)	3 Months Ended
	Mar. 31, 2020
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] | 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] | 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 Nonowner- Occupied - Apartments [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
Other Loans Secured by Real Estate [Member] | Other Construction [Member] | Other Construction [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	WARM
Loss Drivers	Prime Rate, National Unemployment
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member] | Trustmark Mortgage [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	WARM
Loss Drivers	Southern Unemployment
Commercial and Industrial Loans [Member] | Commercial and Industrial Loans [Member] | Commercial and Industrial - Non-Working Capital [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Trustmark historical data
Commercial and Industrial Loans [Member] | Commercial and Industrial Loans [Member] | Commercial and Industrial - Working Capital [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Trustmark historical data
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
Consumer Loans [Member] | Consumer Loans [Member] | All Other Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Prime Rate, Southern Unemployment
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] | Other Loans [Member]
Financing Receivable Recorded Investment [Line Items]
Methodology	DCF
Loss Drivers	Prime Rate, Southern Unemployment

XML

Stock and Incentive Compensation - Summary of Stock Plan Activity (Details) - Stock and Incentive Compensation Plan [Member]	3 Months Ended
	Mar. 31, 2020 shares
Performance Based Awards and Units [Member]
Shares [Roll Forward]
Nonvested shares, beginning of period (in shares)	149,914
Granted (in shares)	53,450
Released from restriction (in shares)	(36,357)
Forfeited (in shares)	(19,474)
Nonvested shares, end of period (in shares)	147,533
Time-Vested Awards and Units [Member]
Shares [Roll Forward]
Nonvested shares, beginning of period (in shares)	300,006
Granted (in shares)	115,520
Released from restriction (in shares)	(79,441)
Forfeited (in shares)	(6,353)
Nonvested shares, end of period (in shares)	329,732

XML

Defined Benefit and Other Postretirement Benefits - Net Periodic Benefit Cost for Plan and Continuing plan (Details) - Trustmark Capital Accumulation Plan [Member] - Trustmark Corporation Pension Plan for Certain Employees of Acquired Financial Institutions [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net periodic benefit cost [Abstract]
Service cost	$ 64	$ 53
Interest cost	60	90
Expected return on plan assets	(38)	(51)
Recognized net loss due to lump sum settlements	0	31
Recognized net actuarial loss	81	93
Net periodic benefit cost	$ 167	$ 216

XML

Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Schedule ofAmortized Cost Basis of Collateral-Dependent Loans by Class of Loans and Collateral Type (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	$ 39,840
Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	20,763
MachineryAndEquipment [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	873
Inventory and Receivables [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	8,970
Vehicles [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	221
Miscellaneous [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	9,013
Construction, Land Development and Other Land [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	1,804
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	1,804
Other Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	519
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	519
Secured by Nonfarm, Nonresidential Properties [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	12,054
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	12,054
Other Real Estate Secured [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	65
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	65
Secured by 1-4 Family Residential Properties [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	1,504
Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	1,504
Commercial and Industrial Loans [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	19,067
Commercial and Industrial Loans [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	115
Commercial and Industrial Loans [Member] | MachineryAndEquipment [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	873
Commercial and Industrial Loans [Member] | Inventory and Receivables [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	8,970
Commercial and Industrial Loans [Member] | Vehicles [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	221
Commercial and Industrial Loans [Member] | Miscellaneous [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	8,888
State and Other Political Subdivision Loans [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	4,079
State and Other Political Subdivision Loans [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	4,079
Other Commercial Loans [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	748
Other Commercial Loans [Member] | Loans Secured by Real Estate [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	623
Other Commercial Loans [Member] | Miscellaneous [Member]
Financing Receivable Impaired [Line Items]
Collateral-Dependent Loans	$ 125

XML

Accounting Policies Recently Adopted and Pending Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2020	Mar. 31, 2020
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Increase to allowance for credit loss on off-balance sheet credit exposures		$ 29,638
ASU 2016-13 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Decrease to loans held for investment, allowance for credit loss	$ 3,000
Increase to allowance for credit loss on off-balance sheet credit exposures	29,600
One-time cumulative effect adjustment through retained earnings, before tax	26,600
One-time cumulative effect adjustment through retained earnings, net of tax	$ 19,900

XML

Fair Value - Fair Value and the Contractual Principal Outstanding of the LHFS (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair value and the contractual principal outstanding of the LHFS [Abstract]
Fair value of LHFS	$ 268,891	$ 169,285
LHFS contractual principal outstanding	256,314	164,420
Fair value less unpaid principal	$ 12,577	$ 4,865

XML

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
	Mar. 31, 2020	Mar. 31, 2019
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss), net of tax	$ 0	$ (47)
Derivatives in Hedging Relationships [Member]
Derivatives, Fair Value [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss), net of tax		$ (47)

XML

Accounting Policies Recently Adopted and Pending Accounting Pronouncements

3 Months Ended

Mar. 31, 2020

New Accounting Pronouncements And Changes In Accounting Principles [Abstract]

Accounting Policies Recently Adopted and Pending Accounting Pronouncements

Note 20 – 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 2018-15, “Intangibles-Goodwill and Other–Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force).”  Issued in August 2018, ASU 2018-15 aims to reduce complexity in the accounting for costs of implementing a cloud computing service arrangement.  ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license).  The amendments of ASU 2018-15 require an entity to follow the guidance in FASB ASC Subtopic 350-40, “Intangibles-Goodwill and Other-Internal-Use Software,” in order to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense.  The amendments of ASU 2018-15 also require an entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement (i.e. the noncancellable period of the arrangement plus periods covered by (1) an option to extend the arrangement if the entity is reasonably certain to exercise that option, (2) an option to terminate the arrangement if the entity is reasonably certain not to exercise the option, and (3) an option to extend (or not to terminate) the arrangement in which exercise of the option is in the control of the vendor).  ASU 2018-15 also requires an entity to present the expense related to the capitalized implementation costs in the same line item in the statement of income as the fees associated with the hosting element (service) of the arrangement, and to classify payments for capitalized implementation costs in the statement of cash flows in the same manner as payments made for fees associated with the hosting element.  ASU 2018-15 became effective for Trustmark on January 1, 2020.  Trustmark does not currently have any material amount of implementation costs related to hosting arrangements that are service contracts within the scope of this ASU; therefore, adoption of ASU 2018-15 did not impact Trustmark’s consolidated financial statements.

ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement.”  Issued in August 2018, the amendments in this ASU remove disclosure requirements in FASB ASC Topic 820 related to (1) the amount of, and reasons for, transfers between Level 1 and Level 2 of the fair value hierarchy; (2) the policy for timing of transfers between levels; (3) the valuation processes for Level 3 fair value measurements; and (4) for non-public entities, the changes in unrealized gains and losses for the period included in earnings for recurring Level 3 fair value measurements held at the end of the reporting period. The ASU also modifies disclosure requirements such that (1) in place of a rollforward for Level 3 fair value measurements, a non-public entity is required to disclose transfers into and out of Level 3 of the fair value hierarchy and purchases and issues of Level 3 assets and liabilities; (2) for investments in certain entities that calculate net asset value, an entity is required to disclose the timing of liquidation of an investee’s assets and the date that restrictions from redemption might lapse, only if the investee has communicated the timing to the entity or announced the timing publicly; and (3) it is clear that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date.  Additionally, this ASU adds disclosure requirements for public entities about (1) the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period, and (2) the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements.  The amendments of ASU 2018-13 became effective for Trustmark on January 1, 2020. Adoption of ASU 2018-13 did not have a material impact on Trustmark’s consolidated financial statements.  Disclosures required by FASB ASC Topic 820 are presented in Note 17 – Fair Value, of this report.

ASU 2017-04, “Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.”  Issued in January 2017, ASU 2017-04 simplifies the manner in which an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test.  Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit's goodwill with the carrying amount of that goodwill.  In computing the implied fair value of goodwill under Step 2, an entity, prior to the amendments in ASU 2017-04, had to perform procedures to determine the fair value at the impairment testing date of its assets and liabilities, including unrecognized assets and liabilities, in accordance with the procedure that would be required in determining the fair value of assets acquired and liabilities assumed in a business combination.  However, under the amendments in ASU 2017-04, an entity should (1) perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount, and (2) recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value, with the understanding that the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit.  Additionally, ASU 2017-04 removes the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails such qualitative test, to perform Step 2 of the goodwill impairment test.  ASU 2017-04 became effective for Trustmark on January 1, 2020, and the amendments of this ASU will be applicable to the annual goodwill impairment

test performed as of October 1, 2020.  Based on Trustmark’s annual goodwill impairment test performed as of October 1, 2019, the fair value of its reporting units exceeded the carrying value and, therefore, the related goodwill was not impaired.  

ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments.”  Issued in June 2016, ASU 2016-13 will add FASB ASC Topic 326, “Financial Instruments-Credit Losses” and finalizes amendments to FASB ASC Subtopic 825-15, “Financial Instruments-Credit Losses.”  The amendments of ASU 2016-13 are intended to provide financial statement users with more decision-useful information related to expected credit losses on financial instruments and other commitments to extend credit by replacing the current incurred loss impairment methodology with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to determine credit loss estimates.  The amendments of ASU 2016-13 eliminate the probable initial recognition threshold and, in turn, reflect an entity’s current estimate of all expected credit losses.  ASU 2016-13 does not specify the method for measuring expected credit losses, and an entity is allowed to apply methods that reasonably reflect its expectations of the credit loss estimate.  Additionally, the amendments of ASU 2016-13 require that credit losses on available for sale debt securities be presented as an allowance rather than as a write-down.  The amendments of ASU 2016-13, and all subsequent ASUs issued by FASB to provide additional guidance and clarification related to this Topic, became effective for Trustmark on January 1, 2020.  

As previously disclosed, Trustmark established a cross-functional Current Expected Credit Loss (CECL) Steering Committee, a CECL Solution Development Working Group and a CECL Working Group which included the appropriate members of Management to evaluate the impact this ASU, and all subsequent ASUs issued by FASB, will have on Trustmark’s financial position, results of operations and financial statement disclosures and determine the most appropriate method of implementing the amendments in these ASUs as well as any resources needed to implement the amendments.  Trustmark selected a third-party vendor to provide allowance for loan loss software as well as advisory services in developing a new methodology that would be compliant with amendments of ASU 2016-13.

In accordance with the amendments of ASU 2016-13, Trustmark elected to maintain pools of loans that were previously accounted for under FASB ASC Subtopic 310-30 and will continue to account for these pools as a unit of account.  Loans are only removed from the existing loan pools if they are written off, paid off or sold.  Upon adoption of ASU 2016-13, the allowance for credit losses was determined for each pool and added to the pool’s carrying value to establish a new amortized cost basis.  The difference between the unpaid principle balance of the pool and the new amortized cost basis is the noncredit premium or discount which will be amortized into interest income over the remaining life of the pool.

As a result of adopting the amendments of ASU 2016-13, Trustmark recorded a decrease to its ACL LHFI of $3.0 million and an increase to its ACL on off-balance sheet credit exposures of $29.6 million resulting in a one-time cumulative effect adjustment through retained earnings of $26.6 million ($19.9 million, net of tax) at the date of adoption.  This adjustment included a qualitative adjustment to the allowance for credit losses related to loans and an allowance on off-balance sheet credit exposures.  Trustmark estimates losses over an approximate one-year forecast period using Moody’s baseline economic forecasts, and then reverts to longer term historical loss experience over a one-year period.  

Trustmark’s estimated allowance for credit losses on both held to maturity securities and available for sale securities under the CECL model was deemed immaterial due to the composition of the portfolios being primarily government agency-backed securities for which the risk of loss is minimal.  Therefore, Trustmark did not recognize a cumulative effective adjustment through retained earnings at the date of adoption related to the held to maturity or available for sale securities.

Disclosures required by the amendments ASU 2016-13 are presented in Note 2 – Securities Available for Sale and Held to Maturity and Note 3 – Loans Held for Investment and Allowance for Credit Losses, of this report.

Pending Accounting Pronouncements

ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting.”  Issued in March 2020, ASU 2020-04 seeks to provided additional guidance, for a limited time, to ease the potential burden in accounting for or recognizing the effects of reference rate reform on financial reporting.  The FASB issued ASU 2020-04 is response to concerns about the structural risks of interbank offered rates (IBORs) and, in particular, the risk that the London Interbank Offer Rate (LIBOR) will no longer be used.  Regulators have begun reference rate reform initiatives to identify alternative reference rates that are more observable or transaction-based and less susceptible to manipulation.  Stakeholders have raised operational challenges likely to arise with the reference rate reform, particularly related to contract modifications and hedge accounting.  The amendments of ASU 2020-04, which are elective and apply to all entities, provide expedients and exceptions for applying GAAP to contract modifications and hedging relationships affected by the reference rate reform id certain criteria are met.  The amendments apply only to contracts and hedging relationships that reference LIBOR or another reference rate that is expected to be discontinued due to reference rate reform.  The optional expedients for contract modifications should be applied consistently for all contracts or

transactions within the relevant Codification Topic or Subtopic or Industry Subtopic that contains the related guidance.  The optional expedients for hedging relationships can be elected on an individual hedging relationship basis.  As the guidance in ASU 2020-04 is intended to assist entity’s during the global market-wide reference rate transition period, it is in effect for a limited time, from March 12, 2020 through December 31, 2022.  Management is currently evaluating the impact to Trustmark as a result of the potential discontinuance of LIBOR, and a determination cannot be made at this time as to the impact the amendments of ASU 2020-04 or the reference rate reform will have on its consolidated financial statements.

ASU 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.”  Issued in December 2019, ASU 2019-12 seeks to simplify the accounting for income taxes by removing certain exceptions to the general principles in FASB ASC Topic 740, Income Taxes.  In particular, the amendments of ASU 2019-12 remove the exceptions to (1) the incremental approach for intra-period tax allocation when there is a loss from continuing operations and income or a gain from other items (e.g., discontinued operations or other comprehensive income); (2) the requirement to recognize a deferred tax liability for equity method investments when a foreign subsidiary becomes an equity method investment; (3) the ability not to recognize a deferred tax liability for a foreign subsidiary when a foreign equity method investment becomes a subsidiary; and (4) the general methodology for calculating income taxes in an interim period when a year-to-date loss exceeds the anticipated loss for the year.  The amendments of ASU 2019-12 (1) require that an entity recognize a franchise tax (or similar tax), that is partially based on income, in accordance with FASB ASC Topic 740 and account for any incremental amount incurred as a non-income-based tax; (2) require that an entity evaluate when a step up in the tax basis of goodwill should be considered part of the business combination in which the book goodwill was originally recognized and when it should instead be considered a separate transaction; (3) specify that an entity is not required to allocate the consolidated amount of current and deferred tax expense to a legal entity that is not subject to tax in its separate financial statements, but rather may elect to do so for a legal entity that is both not subject to tax and disregarded by the taxing authority; and (4) require that an entity reflect the effect of an enacted change in tax laws or rates in the annual effective tax rate computation in the interim period that includes the enactment date.  ASU 2019-12 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020.  Early adoption of ASU 2019-12 is permitted, including adoption in any interim period for periods for which financial statements have not yet been issued.  An entity that elects to early adopt the amendments in an interim period should reflect any adjustments as of the beginning of the annual period that includes that interim period.  Additionally, an entity that elects early adoption must adopt all the amendments in the same period.  The amendments related to separate financial statements of legal entities that are not subject to tax should be applied on a retrospective basis for all periods presented.  The amendments related to changes in ownership of foreign equity method investments or foreign subsidiaries should be applied on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the period of adoption.  The amendments related to franchise taxes that are partially based on income should be applied on either a retrospective basis for all periods presented or a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the fiscal year of adoption.  All other amendments should be applied on a prospective basis.  Trustmark intends to adopt the amendments in ASU 2019-12 during the first quarter of 2021.  Adoption of ASU 2019-12 is not expected to have a material impact to Trustmark’s consolidated financial statements.

ASU 2018-14, “Compensation-Retirement Benefits-Defined Benefit Plans-General (Subtopic 715-20): Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans.”  Issued in August 2018, ASU 2018-14 modifies the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans.  The amendments in ASU 2018-14 remove certain disclosure requirements that are no longer considered cost beneficial, clarify the specific requirements of disclosures and add disclosure requirements identified as relevant.  The amendments of ASU 2018-14 become effective for fiscal years beginning after December 15, 2020.  Trustmark plans to adopt these amendments during the first quarter of 2021.  Management is currently assessing all the potential impacts of the amendments in ASU 2018-14 on Trustmark’s consolidated financial statements; however, the adoption of ASU 2018-14 is not expected to have a material impact on Trustmark’s consolidated financial statements.

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Shareholders' Equity

3 Months Ended

Mar. 31, 2020

Stockholders Equity Note [Abstract]

Shareholders' Equity

Note 16 – 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 2019 Annual Report, which are administered by the federal bank regulatory agencies.  These capital requirements, as defined by federal regulations, involve quantitative and qualitative measures of assets, liabilities and certain off-balance sheet instruments.  Trustmark’s and TNB’s minimum risk-based capital requirements include a capital conservation buffer of 2.50% at March 31, 2020 and December 31, 2019.  Accumulated other comprehensive income (loss), net of tax, is not included in computing regulatory capital.  Trustmark has elected the five-year phase-in transition period 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 March 31, 2020, Trustmark and TNB exceeded all applicable minimum capital standards.  In addition, Trustmark and TNB met applicable regulatory guidelines to be considered well-capitalized at March 31, 2020.  To be categorized in this manner, Trustmark and TNB maintained minimum common equity Tier 1 risk-based capital, Tier 1 risk-based capital, total risk-based capital and Tier 1 leverage ratios as set forth in the accompanying table, and were not subject to any written agreement, order or capital directive, or prompt corrective action directive issued by their primary federal regulators to meet and maintain a specific capital level for any capital measures.  There are no significant conditions or events that have occurred since March 31, 2020, 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 March 31, 2020 and December 31, 2019 ($ in thousands):

	Actual
	Regulatory Capital					Minimum			To Be Well
	Amount		Ratio			Requirement			Capitalized
At March 31, 2020:
Common Equity Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,297,083		11.35	%		7.00	%	n/a
Trustmark National Bank		1,336,080		11.69	%		7.00	%		6.50	%
Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,357,083		11.88	%		8.50	%	n/a
Trustmark National Bank		1,336,080		11.69	%		8.50	%		8.00	%
Total Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,460,942		12.78	%		10.50	%	n/a
Trustmark National Bank		1,439,939		12.60	%		10.50	%		10.00	%
Tier 1 Leverage (to Average Assets)
Trustmark Corporation	$	1,357,083		10.21	%		4.00	%	n/a
Trustmark National Bank		1,336,080		10.07	%		4.00	%		5.00	%
At December 31, 2019:
Common Equity Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,312,668		11.93	%		7.00	%	n/a
Trustmark National Bank		1,352,893		12.30	%		7.00	%		6.50	%
Tier 1 Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,372,668		12.48	%		8.50	%	n/a
Trustmark National Bank		1,352,893		12.30	%		8.50	%		8.00	%
Total Capital (to Risk Weighted Assets)
Trustmark Corporation	$	1,457,760		13.25	%		10.50	%	n/a
Trustmark National Bank		1,437,985		13.07	%		10.50	%		10.00	%
Tier 1 Leverage (to Average Assets)
Trustmark Corporation	$	1,372,668		10.48	%		4.00	%	n/a
Trustmark National Bank		1,352,893		10.35	%		4.00	%		5.00	%

Stock Repurchase Program

On March 11, 2016, the Board of Directors of Trustmark authorized a stock repurchase program under which $100.0 million of Trustmark’s outstanding common stock could be acquired through March 31, 2019.  Trustmark repurchased approximately 1.2 million shares of its common stock valued at $36.9 million during the three months ended March 31, 2019.  Under this authority, Trustmark repurchased approximately 3.2 million shares valued at $100.0 million.  

On April 1, 2019, the Board of Directors of Trustmark authorized a stock repurchase program under which $100.0 million of Trustmark’s outstanding common stock could be acquired through March 31, 2020.  Trustmark repurchased approximately 887 thousand shares of its common stock valued at $27.5 million during the three months ended March 31, 2020. Under this authority, Trustmark repurchased approximately 1.5 million shares valued at $47.2 million.

On January 28, 2020, the Board of Directors of Trustmark authorized a new stock repurchase program, effective April 1, 2020, under which $100.0 million of Trustmark’s outstanding common stock may be acquired through December 31, 2021.  The shares may be purchased from time to time at prevailing market prices, through open market or private transactions, depending on market conditions.  There is no guarantee as to the number of shares that may be repurchased by Trustmark, and Trustmark may discontinue purchases under the program at any time at Management’s discretion.

On March 9, 2020, Trustmark suspended its share repurchase programs to preserve capital to support customers during the COVID-19 pandemic.

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 11 – 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 derivative are included in other interest expense in the accompanying consolidated statements of income.

	Three Months Ended March 31, 2020							Three Months Ended March 31, 2019
	Before Tax Amount		Tax (Expense) Benefit			Net of Tax Amount		Before Tax Amount			Tax (Expense) Benefit			Net of Tax Amount
Securities available for sale and transferred securities:
Net unrealized holding gains (losses) arising    during the period	$	40,507	$	(10,127	)	$	30,380	$	18,824		$	(4,706	)	$	14,118
Change in net unrealized holding loss on    securities transferred to held to maturity		861		(215	)		646		747			(187	)		560
Total securities available for sale    and transferred securities		41,368		(10,342	)		31,026		19,571			(4,893	)		14,678
Pension and other postretirement benefit plans:
Reclassification adjustments for changes realized    in net income:
Net change in prior service costs		37		(9	)		28		63			(16	)		47
Recognized net loss due to lump sum    settlements		—		—			—		31			(7	)		24
Change in net actuarial loss		326		(82	)		244		255			(65	)		190
Total pension and other postretirement benefit    plans		363		(91	)		272		349			(88	)		261
Cash flow hedge derivatives:
Change in accumulated gain (loss) on effective    cash flow hedge derivatives		—		—			—		(63	)		16			(47	)
Reclassification adjustment for (gain) loss realized    in net income		—		—			—		(171	)		43			(128	)
Total cash flow hedge derivatives		—		—			—		(234	)		59			(175	)
Total other comprehensive income (loss)	$	41,731	$	(10,433	)	$	31,298	$	19,686		$	(4,922	)	$	14,764

The following table presents the changes in the balances of each component of accumulated other comprehensive income (loss) for the periods presented ($ in thousands).  All amounts are presented net of tax.

	Securities Available for Sale and Transferred Securities			Defined Benefit Pension Items			Cash Flow Hedge Derivatives			Total
Balance at January 1, 2020	$	(8,017	)	$	(15,583	)	$	—		$	(23,600	)
Other comprehensive income (loss) before reclassification		31,026			—			—			31,026
Amounts reclassified from accumulated other    comprehensive income (loss)		—			272			—			272
Net other comprehensive income (loss)		31,026			272			—			31,298
Balance at March 31, 2020	$	23,009		$	(15,311	)	$	—		$	7,698
Balance at January 1, 2019	$	(43,824	)	$	(12,324	)	$	469		$	(55,679	)
Other comprehensive income (loss) before reclassification		14,678			—			(47	)		14,631
Amounts reclassified from accumulated other    comprehensive income (loss)		—			261			(128	)		133
Net other comprehensive income (loss)		14,678			261			(175	)		14,764
Balance at March 31, 2019	$	(29,146	)	$	(12,063	)	$	294		$	(40,915	)

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Stock and Incentive Compensation

3 Months Ended

Mar. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock and Incentive Compensation

Note 12 – Stock and Incentive Compensation

Trustmark has granted stock and incentive compensation awards and units subject to the provisions of the Stock and Incentive Compensation Plan (the Stock Plan).  Current outstanding and future grants of stock and incentive compensation awards are subject to the provisions of the Stock Plan, which is designed to provide flexibility to Trustmark regarding its ability to motivate, attract and retain the services of key associates and directors.  The Stock Plan also allows Trustmark to grant nonqualified stock options, incentive stock options, stock appreciation rights, restricted stock, restricted stock units and performance units to key associates and directors.

Restricted Stock Grants

Performance Awards

Trustmark’s performance awards vest over three years and are granted to Trustmark’s executive and senior management teams.  Performance awards granted vest based on performance goals of return on average tangible equity and total shareholder return.  Performance awards are valued utilizing a Monte Carlo simulation model to estimate fair value of the awards at the grant date.  The Monte Carlo simulation was performed by an independent valuation consultant and requires the use of subjective modeling assumptions.  These awards are recognized using the straight-line method over the requisite service period.  These awards provide for achievement shares if performance measures exceed 100%.  The restricted share agreement for these awards provides for voting rights and dividend privileges.  During 2020, Trustmark began granting performance units instead of performance awards. The performance units have the same attributes as the previously granted performance awards, except for the performance units do not provide voting rights.

Time-Vested Awards

Trustmark’s time-vested awards vest over three years and are granted to members of Trustmark’s Board of Directors as well as Trustmark’s executive and senior management teams.  Time-vested awards are valued utilizing the fair value of Trustmark’s stock at the grant date.  These awards are recognized on the straight-line method over the requisite service period.  During 2020, Trustmark began granting time-vested units instead of time-vested awards.  The time-vested units have the same attributes as the previously granted time-vested awards, except for the time-vested units do not provide voting rights.

The following table summarize the Stock Plan activity for the periods presented:

	Three Months Ended March 31, 2020
	Performance Awards and Units			Time-Vested Awards and Units
Nonvested shares, beginning of period		149,914			300,006
Granted		53,450			115,520
Released from restriction		(36,357	)		(79,441	)
Forfeited		(19,474	)		(6,353	)
Nonvested shares, end of period		147,533			329,732

The following table presents information regarding compensation expense for awards and units under the Stock Plan for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Performance awards and units	$	(513	)	$	81
Time-vested awards and units		1,907			921
Total compensation expense	$	1,394		$	1,002

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Deposits

3 Months Ended

Mar. 31, 2020

Deposits [Abstract]

Deposits

Note 8 – Deposits

At March 31, 2020 and December 31, 2019, deposits consisted of the following ($ in thousands):

	March 31, 2020		December 31, 2019
Noninterest-bearing demand	$	2,977,058	$	2,891,215
Interest-bearing demand		3,400,264		3,125,914
Savings		3,602,515		3,590,509
Time		1,595,927		1,637,919
Total	$	11,575,764	$	11,245,557

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Shareholders' Equity - Table of Actual Regulatory Capital Amounts and Ratios (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
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		$ 1,297,083	$ 1,312,668
Actual Regulatory Capital Ratio		11.35%	11.93%
Minimum Regulatory Capital Required Ratio		7.00%	7.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio	[1]
Trustmark Corporation [Member] | Tier 1 Capital (to Risk Weighted Assets) [Member]
Tier 1 Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,357,083	$ 1,372,668
Actual Regulatory Capital Ratio		11.88%	12.48%
Minimum Regulatory Capital Required Ratio		8.50%	8.50%
Minimum Regulatory Provision to be Well-Capitalized Ratio	[1]
Trustmark Corporation [Member] | Total Capital (to Risk Weighted Assets) [Member]
Total Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,460,942	$ 1,457,760
Actual Regulatory Capital Ratio		12.78%	13.25%
Minimum Regulatory Capital Required Ratio		10.50%	10.50%
Minimum Regulatory Provision to be Well-Capitalized Ratio	[1]
Trustmark Corporation [Member] | Tier 1 Leverage (to Average Assets) [Member]
Tier 1 Leverage (to Average Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,357,083	$ 1,372,668
Actual Regulatory Capital Ratio		10.21%	10.48%
Minimum Regulatory Capital Required Ratio		4.00%	4.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio	[1]
Trustmark National Bank [Member] | Common Equity Tier 1 Capital (to Risk Weighted Assets) [Member]
Common Equity Tier One Risk Based Capital [Abstract]
Actual Regulatory Capital Amount		$ 1,336,080	$ 1,352,893
Actual Regulatory Capital Ratio		11.69%	12.30%
Minimum Regulatory Capital Required Ratio		7.00%	7.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio		6.50%	6.50%
Trustmark National Bank [Member] | Tier 1 Capital (to Risk Weighted Assets) [Member]
Tier 1 Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,336,080	$ 1,352,893
Actual Regulatory Capital Ratio		11.69%	12.30%
Minimum Regulatory Capital Required Ratio		8.50%	8.50%
Minimum Regulatory Provision to be Well-Capitalized Ratio		8.00%	8.00%
Trustmark National Bank [Member] | Total Capital (to Risk Weighted Assets) [Member]
Total Capital (to Risk Weighted Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,439,939	$ 1,437,985
Actual Regulatory Capital Ratio		12.60%	13.07%
Minimum Regulatory Capital Required Ratio		10.50%	10.50%
Minimum Regulatory Provision to be Well-Capitalized Ratio		10.00%	10.00%
Trustmark National Bank [Member] | Tier 1 Leverage (to Average Assets) [Member]
Tier 1 Leverage (to Average Assets) [Abstract]
Actual Regulatory Capital Amount		$ 1,336,080	$ 1,352,893
Actual Regulatory Capital Ratio		10.07%	10.35%
Minimum Regulatory Capital Required Ratio		4.00%	4.00%
Minimum Regulatory Provision to be Well-Capitalized Ratio		5.00%	5.00%

[1] n/a

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Earnings Per Share (EPS) - Weighted-Average Shares Used to Calculate Basic and Diluted EPS (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Basic shares	63,757	65,239
Dilutive shares	157	140
Diluted shares	63,914	65,379

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Acquired Loans

3 Months Ended

Mar. 31, 2020

Certain Loans Acquired In Transfer Not Accounted For As Debt Securities [Abstract]

Acquired Loans

Note 4 – Acquired Loans

Trustmark’s loss-share agreement with the Federal Deposit Insurance Corporation (FDIC) covering the acquired covered loans secured by 1-4 family residential properties will expire in 2021.

Upon adoption of FASB ASC Topic 326, which was effective for Trustmark on January 1, 2020 in accordance with the amendments in FASB ASU 2016-13, Trustmark elected to account for its existing acquired loans as purchased credit deteriorated (PCD) loans included within the LHFI portfolio. Trustmark elected to maintain pools of loans that were previously accounted for under FASB ASC

Subtopic 310-30, “Receivables – Loans and Debt Securities Acquired with Deteriorated Credit Quality,” and will continue to account for these pools as a unit of account.  Loans are only removed from the existing loan pools if they are written off, paid off or sold.  Upon adoption of FASB ASC Topic 326, the ACL was determined for each pool and added to the pool’s carrying value to establish a new amortized cost basis.  The difference between the unpaid principal balance of the pool and the new amortized cost basis is the noncredit premium or discount which will be amortized into interest income over the remaining life of the pool.  Changes to the allowance for credit losses after adoption of FASB ASC Topic 326 are recorded through the PCL.  Consequently, acquired loans of $72.6 million, as well as the allowance for loan losses, acquired loans of $815 thousand, were transferred on January 1, 2020.  

At December 31, 2019, acquired loans consisted of the following ($ in thousands):

	December 31, 2019
Loans secured by real estate:
Construction, land development and other land	$	4,771
Secured by 1-4 family residential properties		17,525
Secured by nonfarm, nonresidential properties		38,206
Other real estate secured		3,946
Commercial and industrial loans		5,035
Consumer loans		520
Other loans		2,598
Acquired loans		72,601
Less allowance for loan losses, acquired loans		815
Net acquired loans	$	71,786

The following table presents changes in the net carrying value of the acquired loans for the periods presented ($ in thousands):

	Acquired Impaired			Acquired Not ASC 310-30 (1)
Carrying value, net at January 1, 2019	$	102,890		$	2,811
Transfers (2)		—			(2,926	)
Accretion to interest income		5,532			115
Payments received, net		(37,230	)		—
Other (3)		178			—
Change in allowance for loan losses, acquired loans		416			—
Carrying value, net at December 31, 2019		71,786			—
FASB ASU 2016-13 adoption adjustment		(71,786	)		—
Accretion to interest income		—			—
Payments received, net		—			—
Other (3)		—			—
Change in allowance for loan losses, acquired loans		—			—
Carrying value, net at March 31, 2020	$	—		$	—

(1) “Acquired Not ASC 310-30” loans consist of loans that are not in scope for FASB ASC Subtopic 310-30.

(2) “Acquired Not ASC 310-30” loans transferred to LHFI due to the discount on these loans being fully amortized.

(3) Includes miscellaneous timing adjustments as well as acquired loan terminations through foreclosure, charge-off and other terminations.

Under FASB ASC Subtopic 310-30, the accretable yield is the excess of expected cash flows at acquisition over the initial fair value of acquired impaired loans and is recorded as interest income over the estimated life of the loans using the effective yield method if the timing and amount of the future cash flows is reasonably estimable.  The following table presents changes in the accretable yield for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Accretable yield at beginning of period	$	(14,816	)	$	(17,722	)
FASB ASU 2016-13 adoption adjustment		14,816			—
Accretion to interest income		—			1,563
Disposals, net		—			469
Reclassification from nonaccretable difference (1)		—			(1,725	)
Accretable yield at end of period	$	—		$	(17,415	)

(1) Reclassifications from nonaccretable difference are due to lower loss expectations and improvements in expected cash flows.

The following table presents the components of the allowance for loan losses on acquired loans for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	815		$	1,231
FASB ASU 2016-13 adoption adjustment		(815	)		—
Net (charge-offs) recoveries		—			(12	)
Provision for loan losses, acquired loans		—			78
Balance at end of period	$	—		$	1,297

The table below presents the acquired loans by loan class and credit quality indicator at December 31, 2019 ($ in thousands):

	December 31, 2019
			Commercial Loans
			Pass - Categories 1-6		Special Mention - Category 7		Substandard - Category 8		Doubtful - Category 9		Subtotal
Loans secured by real estate:
Construction, land development    and other land			$	4,022	$	—	$	192	$	—	$	4,214
Secured by 1-4 family    residential properties				3,164		42		580		—		3,786
Secured by nonfarm,    nonresidential properties				27,848		—		9,972		386		38,206
Other real estate secured				3,878		—		68		0		3,946
Commercial and industrial loans				3,419		—		—		1,616		5,035
Consumer loans				—		—		—		—		—
Other loans				2,591		—		7		—		2,598
Total acquired loans			$	44,922	$	42	$	10,819	$	2,002	$	57,785
	Consumer Loans
	Current		Past Due 30-89 Days		Past Due 90 Days or More		Nonaccrual (1)		Subtotal		Total Acquired Loans
Loans secured by real estate:
Construction, land development    and other land	$	463	$	94	$	—	$	—	$	557	$	4,771
Secured by 1-4 family    residential properties		12,843		615		281		—		13,739		17,525
Secured by nonfarm,    nonresidential properties		—		—		—		—		—		38,206
Other real estate secured		—		—		—		—		—		3,946
Commercial and industrial loans		—		—		—		—		—		5,035
Consumer loans		489		31		—		—		520		520
Other loans		—		—		—		—		—		2,598
Total acquired loans	$	13,795	$	740	$	281	$	—	$	14,816	$	72,601

(1) Acquired loans not accounted for under FASB ASC Subtopic 310-30.

The following table provides an aging analysis of contractually past due and nonaccrual acquired loans at December 31, 2019 ($ in thousands):

	December 31, 2019
	Past Due
	30-59 Days		60-89 Days		90 Days or More (1)		Total		Nonaccrual (2)		Current Loans		Total Acquired Loans
Loans secured by real estate:
Construction, land development and    other land	$	94	$	—	$	38	$	132	$	—	$	4,639	$	4,771
Secured by 1-4 family residential    properties		696		131		366		1,193		—		16,332		17,525
Secured by nonfarm, nonresidential    properties		36		—		851		887		—		37,319		38,206
Other real estate secured		1		—		52		53		—		3,893		3,946
Commercial and industrial loans		—		—		—		—		—		5,035		5,035
Consumer loans		16		15		—		31		—		489		520
Other loans		—		—		—		—		—		2,598		2,598
Total acquired loans	$	843	$	146	$	1,307	$	2,296	$	—	$	70,305	$	72,601

(1) Past due 90 days or more but still accruing interest.

(2) Acquired loans not accounted for under FASB ASC Subtopic 310-30.

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Fair Value - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) - Recurring Basis [Member] - Level 3 [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
MSR [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		$ 79,394	$ 95,596
Total net (loss) gain included in Mortgage banking, net	[1]	(26,606)	(11,261)
Additions		3,649	2,507
Sales		0	0
Ending Balance		56,437	86,842
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		(23,999)	(8,863)
Other Assets - Derivatives [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance		1,439	1,187
Total net (loss) gain included in Mortgage banking, net	[1]	9,606	1,574
Additions		0	0
Sales		(1,219)	(996)
Ending Balance		9,826	1,765
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		$ 4,428	$ 382

[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.

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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI (Tables)

3 Months Ended

Mar. 31, 2020

Accounts Notes Loans And Financing Receivable Gross Allowance And Net [Abstract]

Loan Portfolio Held for Investment

At March 31, 2020 and December 31, 2019, LHFI consisted of the following ($ in thousands):

	March 31, 2020		December 31, 2019
Loans secured by real estate:
Construction, land development and other land	$	486,265	$	1,162,791
Other secured by 1-4 family residential properties		584,981		1,855,913
Secured by nonfarm, nonresidential properties		2,575,422		2,475,245
Other real estate secured		838,573		724,480
Other loans secured by real estate: (1)
Other construction		650,124		—
Secured by 1-4 family residential properties		1,267,084		—
Commercial and industrial loans		1,476,777		1,477,896
Consumer loans		173,678		175,738
State and other political subdivision loans		938,637		967,944
Other commercial loans (1)		576,379		495,621
LHFI		9,567,920		9,335,628
Less ACL		100,564		84,277
Net LHFI	$	9,467,356	$	9,251,351

(1) In accordance with the guidance in FASB ASC Topic 326, Trustmark redefined its LHFI portfolio segments and related loan classes based on the level at which risk is monitored within the ACL methodology. The other loans secured by real estate portfolio segment and related loan classes were separated from the loans secured by real estate portfolio segment. The other construction loans were segregated from the construction, land development and other land loans. The other loans secured by 1-4 family residential properties were segregated from the loans secured by 1-4 family residential properties and the loans secured by 1-4 family residential properties were redefined in the other loans secured by real estate portfolio segment. Other loans were redefined as other commercial loans.

Schedule of Amortized Cost Basis of Loans on Nonaccrual Status

The following table provides the amortized cost basis of loans on nonaccrual status and loans past due 90 days or more still accruing interest as of March 31, 2020 ($ in thousands):

	March 31, 2020
	Nonaccrual With No ACL		Total Nonaccrual		Loans Past Due 90 Days or More Still Accruing
Loans secured by real estate:
Construction, land development and other land	$	586	$	950	$	—
Other secured by 1-4 family residential properties		519		4,991		40
Secured by nonfarm, nonresidential properties		5,476		7,323		—
Other real estate secured		65		1,076		—
Other loans secured by real estate:
Other construction		—		—		—
Secured by 1-4 family residential properties		1,504		12,466		306
Commercial and industrial loans		18,988		21,156		—
Consumer loans		—		84		296
State and other political subdivision loans		—		4,079		—
Other commercial loans		—		867		66
Total	$	27,138	$	52,992	$	708

Aging Analysis of Past Due and Nonaccrual LHFI by Loan Type

The following table provides an aging analysis of the amortized cost basis of past due LHFI at March 31, 2020 ($ in thousands):

	March 31, 2020
	Past Due
	30-59 Days		60-89 Days		90 Days or More		Total Past Due		Current Loans		Total LHFI
Loans secured by real estate:
Construction, land development and other land	$	389	$	130	$	178	$	697	$	485,568	$	486,265
Other secured by 1-4 family residential properties		3,365		1,137		943		5,445		579,536		584,981
Secured by nonfarm, nonresidential properties		1,583		1,048		283		2,914		2,572,508		2,575,422
Other real estate secured		155		—		354		509		838,064		838,573
Other loans secured by real estate:
Other construction		3		—		—		3		650,121		650,124
Secured by 1-4 family residential properties		2,822		3,335		4,324		10,481		1,256,603		1,267,084
Commercial and industrial loans		1,595		327		1,543		3,465		1,473,312		1,476,777
Consumer loans		1,608		302		297		2,207		171,471		173,678
State and other political subdivision loans		—		—		4,079		4,079		934,558		938,637
Other commercial loans		454		69		480		1,003		575,376		576,379
Total	$	11,974	$	6,348	$	12,481	$	30,803	$	9,537,117	$	9,567,920

The following table provides an aging analysis of past due and nonaccrual LHFI by loan class at December 31, 2019 ($ in thousands):

	December 31, 2019
	Past Due
	30-59 Days		60-89 Days		90 Days or More (1)		Total		Nonaccrual		Current Loans		Total LHFI
Loans secured by real estate:
Construction, land development and other    land	$	380	$	256	$	—	$	636	$	897	$	1,161,258	$	1,162,791
Secured by 1-4 family residential properties		5,254		940		211		6,405		16,810		1,832,698		1,855,913
Secured by nonfarm, nonresidential    properties		1,698		—		—		1,698		7,700		2,465,847		2,475,245
Other real estate secured		8		—		—		8		1,032		723,440		724,480
Commercial and industrial loans		617		12		39		668		21,775		1,455,453		1,477,896
Consumer loans		2,208		380		392		2,980		108		172,650		175,738
State and other political subdivision loans		76		—		—		76		4,079		963,789		967,944
Other loans		152		4		—		156		825		494,640		495,621
Total	$	10,393	$	1,592	$	642	$	12,627	$	53,226	$	9,269,775	$	9,335,628

(1) Past due 90 days or more but still accruing interest.

Impaired Financing Receivables

At December 31, 2019, individually evaluated impaired LHFI consisted of the following ($ in thousands):

	December 31, 2019
	LHFI
	Unpaid Principal Balance		With No Related Allowance Recorded		With an Allowance Recorded		Total Recorded Investment		Related Allowance		Average Recorded Investment
Loans secured by real estate:
Construction, land development and other land	$	926	$	610	$	16	$	626	$	—	$	1,089
Secured by 1-4 family residential properties		6,513		2,104		3,360		5,464		35		4,713
Secured by nonfarm, nonresidential properties		7,295		1,462		5,255		6,717		2,355		8,096
Other real estate secured		69		—		68		68		—		158
Commercial and industrial loans		27,178		19,374		4,084		23,458		707		27,088
Consumer loans		22		—		21		21		—		11
State and other political subdivision loans		4,079		—		4,079		4,079		1,809		6,337
Other loans		1,207		—		784		784		553		1,033
Total	$	47,289	$	23,550	$	17,667	$	41,217	$	5,459	$	48,525

Impact of Modifications Classified as Troubled Debt Restructurings

The following table illustrates the impact of modifications classified as TDRs for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020						2019
	Number of Contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of Contracts		Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment
Loans secured by real estate:
Other secured by 1-4 family residential    properties		5	$	501	$	501		2	$	86	$	86
Commercial and industrial loans		2		1,582		1,582		6		9,054		9,054
Consumer loans		4		20		20		2		30		30
Total		11	$	2,103	$	2,103		10	$	9,170	$	9,170

Troubled Debt Restructuring Subsequently Defaulted

The table below includes the balances at default for TDRs modified within the last 12 months for which there was a payment default during the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020				2019
	Number of Contracts		Recorded Investment		Number of Contracts		Recorded Investment
Loans secured by real estate:
Construction, land development and other land		—	$	—		1	$	22
Other secured by 1-4 family residential properties		3		446		3		684
Commercial and industrial loans		3		194		6		15,178
Consumer loans		—		—		2		28
Total		6	$	640		12	$	15,912

Troubled Debt Restructuring Related to Loans Held for Investment by Loan Type

The following tables detail LHFI classified as TDRs by loan class at March 31, 2020 and 2019 ($ in thousands):

	March 31, 2020
	Accruing		Nonaccrual		Total
Loans secured by real estate:
Construction, land development and other land	$	—	$	14	$	14
Other secured by 1-4 family residential properties		—		3,672		3,672
Secured by nonfarm, nonresidential properties		—		2,899		2,899
Commercial and industrial loans		2,640		17,103		19,743
Consumer loans		17		23		40
Other commercial loans		—		125		125
Total TDRs	$	2,657	$	23,836	$	26,493

	March 31, 2019
	Accruing		Nonaccrual		Total
Loans secured by real estate:
Construction, land development and other land	$	—	$	22	$	22
Secured by 1-4 family residential properties		58		3,098		3,156
Secured by nonfarm, nonresidential properties		—		339		339
Commercial and industrial loans		13,786		12,380		26,166
Consumer loans		—		31		31
Other loans		—		518		518
Total TDRs	$	13,844	$	16,388	$	30,232

Schedule of Amortized Cost Basis of Collateral-Dependent Loans

The following table presents the amortized cost basis of collateral-dependent loans by class of loans and collateral type as of March 31, 2020 ($ in thousands):

	March 31, 2020
	Real Estate		Equipment and Machinery		Inventory and Receivables		Vehicles		Miscellaneous		Total
Loans secured by real estate:
Construction, land development and    other land	$	1,804	$	—	$	—	$	—	$	—	$	1,804
Other secured by 1-4 family    residential properties		519		—		—		—		—		519
Secured by nonfarm, nonresidential    properties		12,054		—		—		—		—		12,054
Other real estate secured		65		—		—		—		—		65
Other loans secured by real estate:												—
Other construction		—		—		—		—		—		—
Secured by 1-4 family residential    properties		1,504		—		—		—		—		1,504
Commercial and industrial loans		115		873		8,970		221		8,888		19,067
Consumer loans		—		—		—		—		—		—
State and other political subdivision loans		4,079		—		—		—		—		4,079
Other commercial loans		623		—		—		—		125		748
Total	$	20,763	$	873	$	8,970	$	221	$	9,013	$	39,840

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 the most recent analysis performed ($ in thousands):

	Term Loans by Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Total
As of March 31, 2020	Commercial LHFI
Loans secured by real estate:
Construction, land development    and other land:
Pass - RR 1 through RR 6	$	77,319	$	223,340	$	54,232	$	7,319	$	4,228	$	6,771	$	36,843	$	410,052
Special Mention - RR 7		—		—		—		—		—		—		—		—
Substandard - RR 8		1,299		1,190		423		39		680		45		—		3,676
Doubtful - RR 9		—		—		—		—		—		42		—		42
Total		78,618		224,530		54,655		7,358		4,908		6,858		36,843		413,770
Other secured by 1-4 family residential    properties:
Pass - RR 1 through RR 6	$	7,746	$	32,807	$	25,192	$	13,745	$	14,504	$	10,639	$	11,512	$	116,145
Special Mention - RR 7		—		92		—		—		—		—		—		92
Substandard - RR 8		284		4,016		1,119		244		486		849		114		7,112
Doubtful - RR 9		—		37		—		—		—		—		—		37
Total		8,030		36,952		26,311		13,989		14,990		11,488		11,626		123,386
Secured by nonfarm, nonresidential    properties:
Pass - RR 1 through RR 6	$	132,966	$	542,615	$	495,056	$	407,125	$	350,006	$	474,906	$	118,137	$	2,520,811
Special Mention - RR 7		—		740		—		—		—		4,826		—		5,566
Substandard - RR 8		4,148		14,888		1,859		4,587		9,202		12,885		1,053		48,622
Doubtful - RR 9		60		—		—		—		—		341		—		401
Total		137,174		558,243		496,915		411,712		359,208		492,958		119,190		2,575,400
Other real estate secured:
Pass - RR 1 through RR 6	$	18,032	$	180,641	$	269,166	$	177,386	$	136,620	$	40,741	$	12,561	$	835,147
Special Mention - RR 7		—		—		—		—		—		—		—		—
Substandard - RR 8		—		197		1,304		—		398		843		—		2,742
Doubtful - RR 9		—		—		—		—		—		—		—		—
Total		18,032		180,838		270,470		177,386		137,018		41,584		12,561		837,889

	Term Loans by Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Total
As of March 31, 2020	Commercial LHFI
Other loans secured by real estate:
Other construction
Pass - RR 1 through RR 6	$	20,369	$	359,717	$	203,819	$	24,199	$	23,154	$	—	$	4,645	$	635,903
Special Mention - RR 7		—		—		—		—		—		—		—		—
Substandard - RR 8		—		—		14,221		—		—		—		—		14,221
Doubtful - RR 9		—		—		—		—		—		—		—		—
Total		20,369		359,717		218,040		24,199		23,154		—		4,645		650,124
Commercial and industrial loans:
Pass - RR 1 through RR 6	$	175,477	$	294,301	$	146,947	$	115,358	$	85,992	$	59,924	$	540,814	$	1,418,813
Special Mention - RR 7		—		—		—		—		—		—		—		—
Substandard - RR 8		8,103		2,336		19,042		864		724		2,641		23,416		57,126
Doubtful - RR 9		17		540		—		—		269		4		8		838
Total		183,597		297,177		165,989		116,222		86,985		62,569		564,238		1,476,777
State and other political subdivision loans:
Pass - RR 1 through RR 6	$	30,645	$	134,410	$	76,100	$	124,088	$	147,560	$	415,156	$	805	$	928,764
Special Mention - RR 7		—		—		—		—		—		4,650		—		4,650
Substandard - RR 8		—		—		—		384		—		4,839		—		5,223
Doubtful - RR 9		—		—		—		—		—		—		—		—
Total		30,645		134,410		76,100		124,472		147,560		424,645		805		938,637
Other commercial loans:
Pass - RR 1 through RR 6	$	37,485	$	90,436	$	35,815	$	15,742	$	58,816	$	55,347	$	267,500	$	561,141
Special Mention - RR 7		—		2,028		—		—		—		—		2,995		5,023
Substandard - RR 8		—		299		698		94		1,265		—		7,747		10,103
Doubtful - RR 9		—		89		—		—		—		23		—		112
Total		37,485		92,852		36,513		15,836		60,081		55,370		278,242		576,379
Total commercial LHFI	$	513,950	$	1,884,719	$	1,344,993	$	891,174	$	833,904	$	1,095,472	$	1,028,150	$	7,592,362

	Term Loans by Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Total
As of March 31, 2020	Consumer LHFI
Loans secured by real estate:
Construction, land development and    other land:
Current	$	4,470	$	44,148	$	14,499	$	2,531	$	1,992	$	4,557	$	—	$	72,197
Past due 30-89 days		—		—		64		52		29		43		—		188
Past due 90 days or more		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		110		—		110
Total		4,470		44,148		14,563		2,583		2,021		4,710		—		72,495
Other secured by 1-4 family residential    properties:
Current	$	5,636	$	24,558	$	17,083	$	5,225	$	2,833	$	17,902	$	380,934	$	454,171
Past due 30-89 days		—		166		111		30		58		1,384		1,870		3,619
Past due 90 days or more		—		5		—		—		—		2		34		41
Nonaccrual		83		38		211		448		—		678		2,306		3,764
Total		5,719		24,767		17,405		5,703		2,891		19,966		385,144		461,595
Secured by nonfarm, nonresidential    properties:
Current	$	—	$	—	$	—	$	—	$	—	$	16	$	—	$	16
Past due 30-89 days		—		—		—		6		—		—		—		6
Past due 90 days or more		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		—		—		—
Total		—		—		—		6		—		16		—		22
Other real estate secured:
Current	$	60	$	—	$	47	$	47	$	111	$	419	$	—	$	684
Past due 30-89 days		—		—		—		—		—		—		—		—
Past due 90 days or more		—		—		—		—		—		—		—		—
Nonaccrual		—		—		—		—		—		—		—		—
Total		60		—		47		47		111		419		—		684

	Term Loans by Origination Year
	2020		2019		2018		2017		2016		Prior		Revolving Loans		Total
As of March 31, 2020	Consumer LHFI
Other loans secured by real estate:
Secured by 1-4 family residential properties
Current	$	42,174	$	253,904	$	251,953	$	128,603	$	140,848	$	431,984	$	—	$	1,249,466
Past due 30-89 days		—		271		2,649		123		—		1,803		—		4,846
Past due 90 days or more		—		96		148		—		—		61		—		305
Nonaccrual		—		630		2,252		788		249		8,548		—		12,467
Total		42,174		254,901		257,002		129,514		141,097		442,396		—		1,267,084
Consumer loans:
Current	$	23,790	$	53,753	$	25,875	$	10,148	$	2,751	$	1,390	$	53,694	$	171,401
Past due 30-89 days		425		469		313		89		31		9		561		1,897
Past due 90 days or more		21		12		11		—		—		—		252		296
Nonaccrual		—		17		28		27		4		8		—		84
Total		24,236		54,251		26,227		10,264		2,786		1,407		54,507		173,678
Total consumer LHFI	$	76,659	$	378,067	$	315,244	$	148,117	$	148,906	$	468,914	$	439,651	$	1,975,558
Total LHFI	$	590,609	$	2,262,786	$	1,660,237	$	1,039,291	$	982,810	$	1,564,386	$	1,467,801	$	9,567,920

The table below presents LHFI by loan class and credit quality indicator at  December 31, 2019 ($ in thousands):

	December 31, 2019
		Commercial LHFI
		Pass - Categories 1-6		Special Mention - Category 7		Substandard - Category 8		Doubtful - Category 9		Subtotal
Loans secured by real estate:
Construction, land development and other    land		$	1,075,146	$	—	$	15,726	$	42	$	1,090,914
Secured by 1-4 family residential    properties			116,592		45		6,355		41		123,033
Secured by nonfarm, nonresidential    properties			2,430,761		—		44,001		328		2,475,090
Other real estate secured			721,238		—		2,547		—		723,785
Commercial and industrial loans			1,407,837		909		68,262		888		1,477,896
Consumer loans			—		—		—		—		—
State and other political subdivision loans			957,948		4,650		5,346		—		967,944
Other loans			469,095		3,445		16,926		30		489,496
Total		$	7,178,617	$	9,049	$	159,163	$	1,329	$	7,348,158

	Consumer LHFI
	Current		Past Due 30-89 Days		Past Due 90 Days or More		Nonaccrual		Subtotal		Total LHFI
Loans secured by real estate:
Construction, land development and other    land	$	71,413	$	332	$	—	$	132	$	71,877	$	1,162,791
Secured by 1-4 family residential    properties		1,710,930		5,922		211		15,817		1,732,880		1,855,913
Secured by nonfarm, nonresidential    properties		155		—		—		—		155		2,475,245
Other real estate secured		695		—		—		—		695		724,480
Commercial and industrial loans		—		—		—		—		—		1,477,896
Consumer loans		172,649		2,588		393		108		175,738		175,738
State and other political subdivision loans		—		—		—		—		—		967,944
Other loans		6,125		—		—		—		6,125		495,621
Total	$	1,961,967	$	8,842	$	604	$	16,057	$	1,987,470	$	9,335,628

Summary of Trustmark's Portfolio Segments, Loan Classes, Loan Pools and the ACL Methodology and Loss Drivers

The following table provides a description of each of Trustmark’s portfolio segments, loan classes, loan pools and the ACL methodology and loss drivers:

Portfolio Segment	Loan Class	Loan Pool	Methodology	Loss Drivers
Loans secured by real estate	Construction, land    development and other land	1-4 family residential    construction	DCF	Prime Rate, National GDP
		Lots and development	DCF	Prime Rate, Southern Unemployment
		Unimproved land	DCF	Prime Rate, Southern Unemployment
	Other secured by 1-4    family residential    properties	Consumer 1-4 family - 1st liens	DCF	Prime Rate, Southern Unemployment
	Secured by nonfarm,    nonresidential properties	Nonowner-occupied -    hotel/motel	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied - office	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied- Retail	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied - senior    living/nursing homes	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonowner-occupied -    all other	DCF	Southern Vacancy Rate, Southern Unemployment
	Other real estate secured	Nonresidential nonowner    -occupied - apartments	DCF	Southern Vacancy Rate, Southern Unemployment
		Nonresidential owner-occupied	DCF	Southern Unemployment, National GDP
Other loans secured by    real estate	Other construction	Other construction	WARM	Prime Rate, National Unemployment
	Secured by 1-4 family    residential properties	Trustmark mortgage	WARM	Southern Unemployment
Commercial and    industrial loans	Commercial and    industrial loans	Commercial and industrial -    non-working capital	DCF	Trustmark historical data
		Commercial and industrial -    working capital	DCF	Trustmark historical data
Consumer loans	Consumer loans	Credit cards	WARM	Trustmark call report data
		Overdrafts	Loss Rate	Trustmark historical data
		All other consumer	DCF	Prime Rate, Southern Unemployment
State and other political    subdivision loans	State and other political    subdivision loans	Obligations of state and    political subdivisions	DCF	Moody's Bond Default Study
Other commercial loans	Other commercial loans	Other loans	DCF	Prime Rate, Southern Unemployment

Change in Allowance for Loan Losses

The following table disaggregates the ACL and the amortized cost basis of the loans by the measurement methodology used at March 31, 2020 ($ in thousands):

	March 31, 2020
	ACL						LHFI
	Individually Evaluated for Credit Loss		Collectively Evaluated for Credit Loss		Total ACL		Individually Evaluated for Credit Loss		Collectively Evaluated for Credit Loss		Total LHFI
Loans secured by real estate:
Construction, land development and other land	$	—	$	9,079	$	9,079	$	1,804		484,461	$	486,265
Other secured by 1-4 family residential properties		—		11,711		11,711		519		584,462		584,981
Secured by nonfarm, nonresidential properties		—		28,127		28,127		12,054		2,563,368		2,575,422
Other real estate secured		—		5,273		5,273		65		838,508		838,573
Other loans secured by real estate:
Other construction		—		7,711		7,711		—		650,124		650,124
Secured by 1-4 family residential properties		—		8,042		8,042		1,504		1,265,580		1,267,084
Commercial and industrial loans		26		14,538		14,564		19,067		1,457,710		1,476,777
Consumer loans		—		6,596		6,596		—		173,678		173,678
State and other political subdivision loans		1,809		1,632		3,441		4,079		934,558		938,637
Other commercial loans		518		5,502		6,020		748		575,631		576,379
Total	$	2,353	$	98,211	$	100,564	$	39,840	$	9,528,080	$	9,567,920

The following table disaggregates the allowance for loan losses and LHFI balances by the impairment evaluation methodology used at December 31, 2019 ($ in thousands):

	December 31, 2019
	Allowance for Loan Losses						LHFI
	Individually Evaluated		Collectively Evaluated		Total		Individually Evaluated		Collectively Evaluated		Total
Loans secured by real estate:
Construction, land development and other land	$	—	$	8,260	$	8,260	$	626	$	1,162,165	$	1,162,791
Secured by 1-4 family residential properties		35		8,897		8,932		5,464		1,850,449		1,855,913
Secured by nonfarm, nonresidential properties		2,355		23,803		26,158		6,717		2,468,528		2,475,245
Other real estate secured		—		4,024		4,024		68		724,412		724,480
Commercial and industrial loans		707		25,285		25,992		23,458		1,454,438		1,477,896
Consumer loans		—		3,379		3,379		21		175,717		175,738
State and other political subdivision loans		1,809		420		2,229		4,079		963,865		967,944
Other loans		553		4,750		5,303		784		494,837		495,621
Total	$	5,459	$	78,818	$	84,277	$	41,217	$	9,294,411	$	9,335,628

Changes in the ACL were as follows for the periods presented ($ in thousands):

	Three Months Ended March 31,
	2020			2019
Balance at beginning of period	$	84,277		$	79,290
FASB ASU 2016-13 adoption adjustments:
LHFI		(3,039	)		—
Allowance for loan losses, acquired loans transfer		815			—
Acquired loans ACL adjustment		1,007			—
Loans charged-off		(5,545	)		(4,033	)
Recoveries		2,468			2,137
Net (charge-offs) recoveries		(3,077	)		(1,896	)
PCL		20,581			1,611
Balance at end of period	$	100,564		$	79,005

The following table details changes in the ACL by loan class for the period presented ($ in thousands):

	2020
	Balance January 1,		FASB ASU 2016-13 Adoption Adjustment			Charge-offs			Recoveries		PCL			Balance March 31,
Loans secured by real estate:
Construction, land development and other land	$	6,371	$	(188	)	$	—		$	94	$	2,802		$	9,079
Other secured by 1-4 family residential properties		5,888		4,188			(64	)		63		1,636			11,711
Secured by nonfarm, nonresidential properties		26,158		(8,179	)		(2,448	)		61		12,535			28,127
Other real estate secured		4,024		(765	)		(8	)		6		2,016			5,273
Other loans secured by real estate:
Other construction		1,889		3,202			—			19		2,601			7,711
Secured by 1-4 family residential properties		3,044		2,891			(19	)		93		2,033			8,042
Commercial and industrial loans		25,992		(8,964	)		(982	)		542		(2,024	)		14,564
Consumer loans		3,379		2,059			(690	)		473		1,375			6,596
State and other political subdivision loans		2,229		2,455			—			—		(1,243	)		3,441
Other commercial loans		5,303		2,084			(1,334	)		1,117		(1,150	)		6,020
Total	$	84,277	$	(1,217	)	$	(5,545	)	$	2,468	$	20,581		$	100,564

The following table details changes in the allowance for loan losses, LHFI by loan class for the period presented ($ in thousands):

	2019
	Balance January 1,		Charge-offs			Recoveries		Provision for Loan Losses			Balance March 31,
Loans secured by real estate:
Construction, land development and other land loans	$	7,390	$	(35	)	$	306	$	(137	)	$	7,524
Secured by 1-4 family residential properties		8,641		(161	)		216		(315	)		8,381
Secured by nonfarm, nonresidential properties		22,376		—			15		(912	)		21,479
Other real estate secured		3,450		—			10		(383	)		3,077
Commercial and industrial loans		27,359		(1,859	)		137		3,565			29,202
Consumer loans		2,890		(793	)		534		517			3,148
State and other political subdivision loans		990		—			—		(198	)		792
Other loans		6,194		(1,185	)		919		(526	)		5,402
Total	$	79,290	$	(4,033	)	$	2,137	$	1,611		$	79,005

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Leases (Tables)

3 Months Ended

Mar. 31, 2020

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 March 31,
	2020			2019
Finance leases
Amortization of right-of-use assets	$	497		$	503
Interest on lease liabilities		67			81
Operating lease cost		1,290			1,300
Short-term lease cost		109			80
Variable lease cost		347			344
Sublease income		(99	)		(87	)
Net lease cost	$	2,211		$	2,221

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):

	Three Months Ended March 31,
	2020		2019
Finance leases
Operating cash flows included in operating activities	$	67	$	265
Financing cash flows included in payments under finance lease obligations		459		513
Operating leases
Operating cash flows (fixed payments) included in other operating activities, net		1,246		1,246
Operating cash flows (liability reduction) included in other operating activities, net		970		941

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 March 31, 2020 and December 31, 2019 ($ in thousands):

	March 31, 2020			December 31, 2019
Finance lease right-of-use assets, net of accumulated depreciation	$	8,829		$	9,326
Finance lease liabilities		9,061			9,520
Operating lease right-of-use assets		30,839			31,182
Operating lease liabilities		32,055			32,354
Weighted-average lease term
Finance leases	8.59 years			8.62 years
Operating leases	8.89 years			9.05 years
Weighted-average discount rate
Finance leases		3.03	%		3.01	%
Operating leases		3.48	%		3.51	%

Future Minimum Rental Commitments Under Finance and Operating Leases

At March 31, 2020, future minimum rental commitments under finance and operating leases were as follows ($ in thousands):

	Finance Leases			Operating Leases
2020 (excluding the three months ended March 31, 2020)	$	1,443		$	3,742
2021		1,615			4,648
2022		1,556			4,173
2023		871			4,136
2024		572			4,040
Thereafter		4,452			16,726
Total minimum lease payments		10,509			37,465
Less imputed interest		(1,448	)		(5,410	)
Lease liabilities	$	9,061		$	32,055

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Defined Benefit and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2020

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 March 31,
	2020			2019
Service cost	$	64		$	53
Interest cost		60			90
Expected return on plan assets		(38	)		(51	)
Recognized net loss due to lump sum settlements		—			31
Recognized net actuarial loss		81			93
Net periodic benefit cost	$	167		$	216

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 March 31,
	2020		2019
Service cost	$	19	$	27
Interest cost		414		541
Amortization of prior service cost		37		63
Recognized net actuarial loss		246		162
Net periodic benefit cost	$	716	$	793

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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Impaired Financing Receivables (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	$ 47,289
Total LHFI With No Related Allowance Recorded	23,550
Total LHFI With an Allowance Recorded	17,667
Total LHFI Recorded Investment	41,217
Related Allowance	5,459
Average Recorded Investment	48,525
Commercial and Industrial Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	27,178
Total LHFI With No Related Allowance Recorded	19,374
Total LHFI With an Allowance Recorded	4,084
Total LHFI Recorded Investment	23,458
Related Allowance	707
Average Recorded Investment	27,088
Consumer Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	22
Total LHFI With No Related Allowance Recorded	0
Total LHFI With an Allowance Recorded	21
Total LHFI Recorded Investment	21
Related Allowance	0
Average Recorded Investment	11
State and Other Political Subdivision Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	4,079
Total LHFI With No Related Allowance Recorded	0
Total LHFI With an Allowance Recorded	4,079
Total LHFI Recorded Investment	4,079
Related Allowance	1,809
Average Recorded Investment	6,337
Other Loans [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	1,207
Total LHFI With No Related Allowance Recorded	0
Total LHFI With an Allowance Recorded	784
Total LHFI Recorded Investment	784
Related Allowance	553
Average Recorded Investment	1,033
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	926
Total LHFI With No Related Allowance Recorded	610
Total LHFI With an Allowance Recorded	16
Total LHFI Recorded Investment	626
Related Allowance	0
Average Recorded Investment	1,089
Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	6,513
Total LHFI With No Related Allowance Recorded	2,104
Total LHFI With an Allowance Recorded	3,360
Total LHFI Recorded Investment	5,464
Related Allowance	35
Average Recorded Investment	4,713
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	7,295
Total LHFI With No Related Allowance Recorded	1,462
Total LHFI With an Allowance Recorded	5,255
Total LHFI Recorded Investment	6,717
Related Allowance	2,355
Average Recorded Investment	8,096
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]
Loan and Lease Receivables, Impaired [Abstract]
Total LHFI Unpaid Principal Balance	69
Total LHFI With No Related Allowance Recorded	0
Total LHFI With an Allowance Recorded	68
Total LHFI Recorded Investment	68
Related Allowance	0
Average Recorded Investment	$ 158

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Loans Held for Investment (LHFI) and Allowance for Loan Losses, LHFI - Loan Portfolio Held for Investment (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Loan Portfolio [Abstract]
Total LHFI	[1]	$ 9,567,920	$ 9,335,628
Less allowance for credit losses (ACL), LHFI	[1]	100,564	84,277
Net LHFI		9,467,356	9,251,351
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI		486,265	1,162,791
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	[2]	1,267,084
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI		584,981	1,855,913
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI		838,573	724,480
Other Construction [Member] | Other Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI	[2]	650,124
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]
Loan Portfolio [Abstract]
Total LHFI		2,575,422	2,475,245
Commercial and Industrial Loans [Member]
Loan Portfolio [Abstract]
Total LHFI		1,476,777	1,477,896
Consumer Loans [Member]
Loan Portfolio [Abstract]
Total LHFI		173,678	175,738
State and Other Political Subdivision Loans [Member]
Loan Portfolio [Abstract]
Total LHFI		938,637	967,944
Other Commercial Loans [Member]
Loan Portfolio [Abstract]
Total LHFI	[2]	$ 576,379	$ 495,621

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

[2] In accordance with the guidance in FASB ASC Topic 326, Trustmark redefined its LHFI portfolio segments and related loan classes based on the level at which risk is monitored within the ACL methodology. The other loans secured by real estate portfolio segment and related loan classes were separated from the loans secured by real estate portfolio segment. The other construction loans were segregated from the construction, land development and other land loans. The other loans secured by 1-4 family residential properties were segregated from the loans secured by 1-4 family residential properties and the loans secured by 1-4 family residential properties were redefined in the other loans secured by real estate portfolio segment. Other loans were redefined as other commercial loans.

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Securities Available for Sale and Held to Maturity - Securities Held to Maturity by Credit Rating, as Determined by Moody's (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Held to Maturity Amortized Cost	$ 704,276	$ 738,099
Aaa [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Held to Maturity Amortized Cost	672,519
Aaa1 to Aa3 [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Held to Maturity Amortized Cost	26,208
Not Rated [Member]
Schedule of Available For Sale and Held to Maturity Securities [Line Items]
Securities Held to Maturity Amortized Cost	$ 5,549

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Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands		Mar. 31, 2020		Dec. 31, 2019
Assets
Cash and due from banks		$ 404,341		$ 358,916
Federal funds sold and securities purchased under reverse repurchase agreements		2,000
Securities available for sale, at fair value (amortized cost: $1,791,852; allowance for credit losses: $0)		1,833,779		1,602,404
Securities held to maturity, net of allowance for credit losses of $0 (fair value: $731,441-2020; $746,202-2019)		704,276		738,099
Loans held for sale (LHFS)		325,389		226,347
Loans held for investment (LHFI)	[1]	9,567,920		9,335,628
Less allowance for credit losses (ACL), LHFI	[1]	100,564		84,277
Net LHFI		9,467,356		9,251,351
Acquired loans	[1]			72,601
Less allowance for loan losses, acquired loans	[1]			815
Net acquired loans				71,786
Net LHFI and acquired loans		9,467,356		9,323,137
Premises and equipment, net		190,179		189,791
Mortgage servicing rights		56,437		79,394
Goodwill		381,717		379,627
Identifiable intangible assets, net		7,537		7,343
Other real estate		24,847		29,248
Operating lease right-of-use assets		30,839		31,182
Other assets		591,132		532,389
Total Assets		14,019,829		13,497,877
Deposits:
Noninterest-bearing		2,977,058		2,891,215
Interest-bearing		8,598,706		8,354,342
Total deposits		11,575,764		11,245,557
Federal funds purchased and securities sold under repurchase agreements		421,821		256,020
Other borrowings		84,230		85,396
ACL on off-balance sheet credit exposures		36,421	[1]	0
Junior subordinated debt securities		61,856		61,856
Operating lease liabilities		32,055		32,354
Other liabilities		155,283		155,992
Total Liabilities		12,367,430		11,837,175
Shareholders' Equity
Common stock, no par value: Authorized: 250,000,000 shares Issued and outstanding: 63,396,912 shares - 2020; 64,200,111 shares - 2019		13,209		13,376
Capital surplus		229,403		256,400
Retained earnings		1,402,089		1,414,526
Accumulated other comprehensive income (loss), net of tax		7,698		(23,600)
Total Shareholders' Equity		1,652,399		1,660,702
Total Liabilities and Shareholders' Equity		$ 14,019,829		$ 13,497,877

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

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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, 2018	$ 1,591,453	$ 13,717	$ 309,545	$ 1,323,870	$ (55,679)
Balance (in shares) at Dec. 31, 2018		65,834,395
Net income per consolidated statements of income	33,339			33,339
Other comprehensive income (loss), net of tax	14,764				14,764
Common stock dividends paid ($0.23 per share)	(15,033)			(15,033)
Shares withheld to pay taxes, long-term incentive plan	(1,604)	$ 25	(1,629)
Shares withheld to pay taxes, long-term incentive plan (in shares)		123,821
Repurchase and retirement of common stock	(36,893)	$ (243)	(36,650)
Repurchase and retirement of common stock (in shares)		(1,168,273)
Compensation expense, long-term incentive plan	1,002		1,002
Balance at Mar. 31, 2019	1,587,028	$ 13,499	272,268	1,342,176	(40,915)
Balance (in shares) at Mar. 31, 2019		64,789,943
Balance at Dec. 31, 2019	$ 1,660,702	$ 13,376	256,400	1,414,526	(23,600)
Balance (in shares) at Dec. 31, 2019	64,200,111	64,200,111
FASB ASU 2016-13 adoption adjustment	$ (19,949)			(19,949)
Net income per consolidated statements of income	22,218			22,218
Other comprehensive income (loss), net of tax	31,298				31,298
Common stock dividends paid ($0.23 per share)	(14,706)			(14,706)
Shares withheld to pay taxes, long-term incentive plan	(1,020)	$ 17	(1,037)
Shares withheld to pay taxes, long-term incentive plan (in shares)		83,759
Repurchase and retirement of common stock	(27,538)	$ (184)	(27,354)
Repurchase and retirement of common stock (in shares)		(886,958)
Compensation expense, long-term incentive plan	1,394		1,394
Balance at Mar. 31, 2020	$ 1,652,399	$ 13,209	$ 229,403	$ 1,402,089	$ 7,698
Balance (in shares) at Mar. 31, 2020	63,396,912	63,396,912

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Acquired Loans - Components of the Allowance for Loan Losses on Acquired Loans (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020		Mar. 31, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period		$ 815	[1]	$ 1,231
FASB ASU 2016-13 adoption adjustment		$ (815)
Net (charge-offs) recoveries				(12)
Provision for loan losses, acquired loans	[1]			78
Balance at end of period				$ 1,297

[1] Effective January 1, 2020, Trustmark adopted FASB ASU 2016-13 using the modified retrospective approach.  Therefore, prior period balances are presented under legacy GAAP and may not be comparable to current period presentation.

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Leases - Components of Net Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Finance leases
Amortization of right-of-use assets	$ 497	$ 503
Interest on lease liabilities	67	81
Operating lease cost	1,290	1,300
Short-term lease cost	109	80
Variable lease cost	347	344
Sublease income	(99)	(87)
Net lease cost	$ 2,211	$ 2,221

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Deposits - Deposits Summary (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Deposits [Abstract]
Noninterest-bearing demand	$ 2,977,058	$ 2,891,215
Interest-bearing demand	3,400,264	3,125,914
Savings	3,602,515	3,590,509
Time	1,595,927	1,637,919
Total deposits	$ 11,575,764	$ 11,245,557

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Mortgage Banking - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) CPR	Mar. 31, 2019 USD ($) CPR
Schedule of changes in the reserve for mortgage loan [Abstract]
Assumed average prepayment speed | CPR	17	10
Average discount rate (in hundredths)	9.52%	10.04%
Mortgage servicing rights [Abstract]
Residential mortgage loans sold	$ 317,100	$ 208,900
Gains on sales of residential mortgage loans	$ 14,300	5,000
Period of putback response	60 days
Reserve for mortgage loan servicing putback expenses	$ 500	$ 875