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Securities Available for Sale and Held to Maturity (Tables) | 12 Months Ended
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Dec. 31, 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 December 31, 2025 and 2024 ($ in thousands):
|  | Securities Available for Sale |  |  | Securities Held to Maturity |
|  |  |  |  | Gross |  |  | Gross |  |  | Estimated |  |  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |  |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
December 31, 2025 |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |  |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. Treasury securities |  | $ | 205,282 |  |  | $ | 3,666 |  |  | $ | — |  |  | $ | 208,948 |  |  | $ | 30,615 |  |  | $ | 185 |  |  | $ | — |  |  | $ | 30,800 |
U.S. Government agency obligations |  |  | 70,924 |  |  |  | 609 |  |  |  | (684 | ) |  |  | 70,849 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage pass-through securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guaranteed by GNMA |  |  | 40,425 |  |  |  | 106 |  |  |  | (1,996 | ) |  |  | 38,535 |  |  |  | 13,154 |  |  |  | 22 |  |  |  | (393 | ) |  |  | 12,783 |
Issued by FNMA and FHLMC |  |  | 1,165,292 |  |  |  | 33,836 |  |  |  | (11,369 | ) |  |  | 1,187,759 |  |  |  | 372,311 |  |  |  | 2,070 |  |  |  | (7,812 | ) |  |  | 366,569 |
Other residential mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued or guaranteed by FNMA, FHLMC or GNMA |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 96,667 |  |  |  | — |  |  |  | (4,233 | ) |  |  | 92,434 |
Commercial mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued or guaranteed by FNMA, FHLMC or GNMA |  |  | 360,521 |  |  |  | 10,698 |  |  |  | (480 | ) |  |  | 370,739 |  |  |  | 694,707 |  |  |  | 73 |  |  |  | (16,797 | ) |  |  | 677,983 |
Total |  | $ | 1,842,444 |  |  | $ | 48,915 |  |  | $ | (14,529 | ) |  | $ | 1,876,830 |  |  | $ | 1,207,454 |  |  | $ | 2,350 |  |  | $ | (29,235 | ) |  | $ | 1,180,569 |
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 December 31, 2025 and 2024 ($ in thousands):
|  | December 31, |
|  | 2025 |  |  | 2024 |
Aaa |  | $ | 52,405 |  |  | $ | 1,335,385 |
Aa1 to Aa3 |  |  | 1,155,049 |  |  |  | — |
Total |  | $ | 1,207,454 |  |  | $ | 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 ACL has not been recorded and segregated by length of impairment at December 31, 2025 and 2024 ($ in thousands):
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  |  |  |  | Gross |  |  |  |  |  | Gross |  |  |  |  |  | Gross |
|  | Estimated |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |
December 31, 2025 |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |
U.S. Government agency obligations |  | $ | 3,905 |  |  | $ | (14 | ) |  | $ | 40,952 |  |  | $ | (670 | ) |  | $ | 44,857 |  |  | $ | (684 | )
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage pass-through securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Guaranteed by GNMA |  |  | 5,925 |  |  |  | (18 | ) |  |  | 26,946 |  |  |  | (2,371 | ) |  |  | 32,871 |  |  |  | (2,389 | )
Issued by FNMA and FHLMC |  |  | 91,230 |  |  |  | (234 | ) |  |  | 205,163 |  |  |  | (18,947 | ) |  |  | 296,393 |  |  |  | (19,181 | )
Other residential mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued or guaranteed by FNMA, FHLMC or GNMA |  |  | — |  |  |  | — |  |  |  | 92,434 |  |  |  | (4,233 | ) |  |  | 92,434 |  |  |  | (4,233 | )
Commercial mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issued or guaranteed by FNMA, FHLMC or GNMA |  |  | — |  |  |  | — |  |  |  | 739,436 |  |  |  | (17,277 | ) |  |  | 739,436 |  |  |  | (17,277 | )
Total |  | $ | 101,060 |  |  | $ | (266 | ) |  | $ | 1,104,931 |  |  | $ | (43,498 | ) |  | $ | 1,205,991 |  |  | $ | (43,764 | )
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 gains or losses as a result of calls and dispositions of securities, as well as any associated proceeds, were as follows ($ in thousands):
|  | Years Ended December 31, |
Available for Sale |  | 2025 |  |  | 2024 |  |  | 2023 |
Proceeds from calls and sales of securities |  | $ | — |  |  | $ | 1,378,272 |  |  | $ | 4,796 |
Gross realized gains |  |  | — |  |  |  | — |  |  |  | 47 |
Gross realized losses |  |  | — |  |  |  | (182,792 | ) |  |  | (8 | )
Contractual Maturities of Available for Sale and Held to Maturity Securities | The amortized cost and estimated fair value of securities av ailable for sale and held to maturity at December 31, 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 |  |  | Securities |
|  | Available for Sale |  |  | Held to Maturity |
|  | Amortized |  |  | Estimated |  |  | Amortized |  |  | Estimated |
|  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
Due in one year or less |  | $ | 34,943 |  |  | $ | 35,204 |  |  | $ | — |  |  | $ | — |
Due after one year through five years |  |  | 27,717 |  |  |  | 28,119 |  |  |  | 30,615 |  |  |  | 30,800 |
Due after five years through ten years |  |  | 213,546 |  |  |  | 216,474 |  |  |  | — |  |  |  | — |
|  |  | 276,206 |  |  |  | 279,797 |  |  |  | 30,615 |  |  |  | 30,800 |
Mortgage-backed securities |  |  | 1,566,238 |  |  |  | 1,597,033 |  |  |  | 1,176,839 |  |  |  | 1,149,769 |
Total |  | $ | 1,842,444 |  |  | $ | 1,876,830 |  |  | $ | 1,207,454 |  |  | $ | 1,180,569 |

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