XML 41 R33.htm IDEA: XBRL DOCUMENT v3.25.3

Securities Available for Sale and Held to Maturity (Tables)

9 Months Ended

Sep. 30, 2025

Investments, Debt and Equity Securities [Abstract]

Amortized Cost and Estimated Fair Value of Available for Sale and Held to Maturity Securities

The following tables are a summary of the amortized cost and estimated fair value of securities available for sale and held to maturity at September 30, 2025 and December 31, 2024 ($ in thousands):

		Securities Available for Sale																Securities Held to Maturity
September 30, 2025		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value				Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
U.S. Treasury securities		$	204,757			$	3,512			$	—			$	208,269			$	30,421			$	114			$	—			$	30,535
U.S. Government agency    obligations			70,756				575				(796	)			70,535				—				—				—				—
Mortgage-backed securities
Residential mortgage pass-    through securities
Guaranteed by GNMA			37,815				92				(2,101	)			35,806				14,353				5				(445	)			13,913
Issued by FNMA and    FHLMC			1,109,332				30,057				(12,458	)			1,126,931				384,625				345				(9,297	)			375,673
Other residential mortgage-    backed securities
Issued or guaranteed by    FNMA, FHLMC or    GNMA			—				—				—				—				103,041				—				(4,794	)			98,247
Commercial mortgage-    backed securities
Issued or guaranteed by    FNMA, FHLMC or    GNMA			362,283				10,948				(527	)			372,704				736,019				71				(20,722	)			715,368
Total		$	1,784,943			$	45,184			$	(15,882	)		$	1,814,245			$	1,268,459			$	535			$	(35,258	)		$	1,233,736

		Securities Available for Sale																Securities Held to Maturity
December 31, 2024		Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value				Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Estimated Fair Value
U.S. Treasury Securities		$	203,524			$	548			$	(1,403	)		$	202,669			$	29,842			$	1			$	(522	)		$	29,321
U.S. Government agency    obligations			41,194				—				(2,387	)			38,807				—				—				—				—
Mortgage-backed securities
Residential mortgage pass-    through securities
Guaranteed by GNMA			31,365				3				(2,957	)			28,411				16,218				—				(844	)			15,374
Issued by FNMA and    FHLMC			1,091,122				1,610				(22,194	)			1,070,538				423,372				94				(23,853	)			399,613
Other residential mortgage-    backed securities
Issued or guaranteed by    FNMA, FHLMC or    GNMA			—				—				—				—				123,685				—				(8,004	)			115,681
Commercial mortgage-    backed securities
Issued or guaranteed by    FNMA, FHLMC or    GNMA			352,332				827				(1,050	)			352,109				742,268				3				(43,153	)			699,118
Total		$	1,719,537			$	2,988			$	(29,991	)		$	1,692,534			$	1,335,385			$	98			$	(76,376	)		$	1,259,107

Securities Held to Maturity by Credit Rating, as Determined by Moody's

The following table presents the amortized cost of Trustmark’s securities held to maturity by credit rating, as determined by Moody’s, at September 30,2025 and December 31, 2024 ($ in thousands):

		September 30, 2025				December 31, 2024
Aaa		$	52,831			$	1,335,385
Aa1 to Aa3			1,215,628				—
Total		$	1,268,459			$	1,335,385

Securities with Gross Unrealized Losses, Segregated by Length of Impairment

The tables below include securities with gross unrealized losses for which an allowance for credit losses has not been recorded segregated by length of impairment at September 30, 2025 and December 31, 2024 ($ in thousands):

		Less than 12 Months								12 Months or More								Total
September 30, 2025		Estimated Fair Value				Gross Unrealized Losses				Estimated Fair Value				Gross Unrealized Losses				Estimated Fair Value				Gross Unrealized Losses
U.S. Government agency obligations		$	25,624			$	(313	)		$	19,015			$	(483	)		$	44,639			$	(796	)
Mortgage-backed securities
Residential mortgage pass-through    securities
Guaranteed by GNMA			1,212				(23	)			29,230				(2,523	)			30,442				(2,546	)
Issued by FNMA and FHLMC			284,623				(600	)			228,922				(21,155	)			513,545				(21,755	)
Other residential mortgage-backed    securities
Issued or guaranteed by FNMA,    FHLMC or GNMA			—				—				98,247				(4,794	)			98,247				(4,794	)
Commercial mortgage-backed securities
Issued or guaranteed by FNMA,    FHLMC or GNMA			—				—				779,016				(21,249	)			779,016				(21,249	)
Total		$	311,459			$	(936	)		$	1,154,430			$	(50,204	)		$	1,465,889			$	(51,140	)
December 31, 2024
U.S. Treasury Securities		$	123,277			$	(1,925	)		$	—			$	—			$	123,277			$	(1,925	)
U.S. Government agency obligations			38,807				(2,387	)			—				—				38,807				(2,387	)
Mortgage-backed securities
Residential mortgage pass-through    securities
Guaranteed by GNMA			15,802				(293	)			27,803				(3,508	)			43,605				(3,801	)
Issued by FNMA and FHLMC			981,747				(13,848	)			237,487				(32,199	)			1,219,234				(46,047	)
Other residential mortgage-backed    securities
Issued or guaranteed by FNMA,    FHLMC or GNMA			—				—				115,681				(8,004	)			115,681				(8,004	)
Commercial mortgage-backed securities
Issued or guaranteed by FNMA,    FHLMC or GNMA			164,971				(536	)			767,566				(43,667	)			932,537				(44,203	)
Total		$	1,324,604			$	(18,989	)		$	1,148,537			$	(87,378	)		$	2,473,141			$	(106,367	)

Gains and Losses as a Result of Calls and Disposition of Securities

For the periods presented, gross realized losses as a result of calls and dispositions of securities, as well as any associated proceeds, are shown below ($ in thousands).

		Three Months Ended September 30,								Nine Months Ended September 30,
Available for Sale		2025				2024				2025				2024
Proceeds from calls and sales of securities		$	—			$	—			$	—			$	1,378,272
Gross realized (losses)			—				—				—				(182,792	)

Contractual Maturities of Available for Sale and Held to Maturity Securities

The amortized cost and estimated fair value of securities available for sale and held to maturity at September 30, 2025, 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		$	35,927			$	36,122			$	—			$	—
Due after one year through five years			39,643				40,166				30,421				30,535
Due after five years through ten years			199,943				202,516				—				—
			275,513				278,804				30,421				30,535
Mortgage-backed securities			1,509,430				1,535,441				1,238,038				1,203,201
Total		$	1,784,943			$	1,814,245			$	1,268,459			$	1,233,736

X

- Definition

Tabular disclosure of credit quality indicator for investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

+ Details

Name:	us-gaap_DebtSecuritiesHeldToMaturityCreditQualityIndicatorTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of realized and unrealized gain (loss) on investment in security.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(9)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

+ Details

Name:	us-gaap_GainLossOnInvestmentsTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.

+ References

No definition available.

+ Details

Name:	us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

+ References

No definition available.

+ Details

Name:	us-gaap_MarketableSecuritiesTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of unrealized gains and losses on investments.

+ References

No definition available.

+ Details

Name:	us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration