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Investment Securities | 6 Months Ended
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Jun. 30, 2025
Investments [Abstract] |
Investment Securities | Note 2 - Investment Securities The amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities at June 30, 2025 and December 31, 2024 are summarized below.
| June 30, 2025
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Investment securities held to maturity: |  |  |  |  |  |  |
Mortgage-backed securities issued by U.S. Government sponsored enterprises | $ | 2,502,639 |  |  | $ | — |  |  | $ | (26,350) |  |  | $ | 2,476,289 |
Total investment securities held to maturity(1) | $ | 2,502,639 |  |  | $ | — |  |  | $ | (26,350) |  |  | $ | 2,476,289 |
Investment securities available for sale: |  |  |  |  |  |  |
U.S. Treasury securities | $ | 1,220,809 |  |  | $ | 20,119 |  |  | $ | (2) |  |  | $ | 1,240,926 |
U.S. Government agency securities | 29,995 |  |  | — |  |  | (284) |  |  | 29,711 |
Mortgage-backed securities issued by U.S. Government agencies | 1,551,556 |  |  | 6,540 |  |  | (101,208) |  |  | 1,456,888 |
Mortgage-backed securities issued by U.S. Government sponsored enterprises | 2,239,222 |  |  | 1,792 |  |  | (199,625) |  |  | 2,041,389 |
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | 623,963 |  |  | 119 |  |  | (88,413) |  |  | 535,669 |
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | 2,467,691 |  |  | 41,667 |  |  | (24,284) |  |  | 2,485,074 |
Corporate debt securities and other debt securities | 9,160 |  |  | 7 |  |  | — |  |  | 9,167 |
Total investment securities available for sale(2) | $ | 8,142,396 |  |  | $ | 70,244 |  |  | $ | (413,816) |  |  | $ | 7,798,824 |
| December 31, 2024
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Investment securities held to maturity: |  |  |  |  |  |  |
Mortgage-backed securities issued by U.S. Government sponsored enterprises | $ | 2,581,469 |  |  | $ | — |  |  | $ | (56,944) |  |  | $ | 2,524,525 |
Total investment securities held to maturity(1) | $ | 2,581,469 |  |  | $ | — |  |  | $ | (56,944) |  |  | $ | 2,524,525 |
Investment securities available for sale: |  |  |  |  |  |  |
U.S. Treasury securities | $ | 1,214,363 |  |  | $ | 3,203 |  |  | $ | (4,824) |  |  | $ | 1,212,742 |
U.S. Government agency securities | 29,993 |  |  | — |  |  | (830) |  |  | 29,163 |
Mortgage-backed securities issued by U.S. Government agencies | 1,583,331 |  |  | 848 |  |  | (121,389) |  |  | 1,462,790 |
Mortgage-backed securities issued by U.S. Government sponsored enterprises | 2,294,700 |  |  | 250 |  |  | (260,915) |  |  | 2,034,035 |
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | 657,453 |  |  | — |  |  | (107,252) |  |  | 550,201 |
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | 2,290,968 |  |  | 4,724 |  |  | (42,576) |  |  | 2,253,116 |
Corporate debt securities and other debt securities | 9,110 |  |  | — |  |  | (139) |  |  | 8,971 |
Total investment securities available for sale(2) | $ | 8,079,918 |  |  | $ | 9,025 |  |  | $ | (537,925) |  |  | $ | 7,551,018 |
(1) The amounts reported exclude accrued interest receivable on investment securities HTM of $5.5 million and $5.7 million at June 30, 2025 and December 31, 2024, respectively, which are presented as a component of other assets on the consolidated balance sheets. The amortized cost basis of investment securities HTM includes a discount of $(614.6) million and $(649.7) million at June 30, 2025 and December 31, 2024, respectively, related to the unamortized portion of unrealized losses on investment securities HTM. (2) The amounts reported exclude accrued interest receivable on investment securities AFS of $29.8 million and $29.5 million at June 30, 2025 and December 31, 2024, respectively, which are presented as a component of other assets on the consolidated balance sheets. At June 30, 2025, investment securities AFS and investment securities HTM with carrying values of $3.21 billion and $2.22 billion, respectively, were pledged to secure certain deposits and other liabilities, as required by law or contractual agreements. At December 31, 2024, investment securities AFS and investment securities HTM with a carrying value of $2.83 billion and $2.45 billion, respectively, were pledged to secure certain deposits and other liabilities, as required by law or contractual agreements. Gross unrealized losses on investment securities AFS and the fair value of the related securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2025 and December 31, 2024 are presented below.
| June 30, 2025
| Less than 12 Months |  | 12 Months or Longer |  | Total
(in thousands) | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. Treasury securities | $ | 22,859 |  |  | $ | (2) |  |  | $ | — |  |  | $ | — |  |  | $ | 22,859 |  |  | $ | (2) |
U.S. Government agency securities | — |  |  | — |  |  | 29,711 |  |  | (284) |  |  | 29,711 |  |  | (284) |
Mortgage-backed securities issued by U.S. Government agencies | 305,312 |  |  | (3,292) |  |  | 563,032 |  |  | (97,916) |  |  | 868,344 |  |  | (101,208) |
Mortgage-backed securities issued by U.S. Government sponsored enterprises | 413,103 |  |  | (4,210) |  |  | 1,511,874 |  |  | (195,415) |  |  | 1,924,977 |  |  | (199,625) |
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | — |  |  | — |  |  | 506,401 |  |  | (88,413) |  |  | 506,401 |  |  | (88,413) |
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | 68,265 |  |  | (597) |  |  | 283,581 |  |  | (23,687) |  |  | 351,846 |  |  | (24,284) |
Total | $ | 809,539 |  |  | $ | (8,101) |  |  | $ | 2,894,599 |  |  | $ | (405,715) |  |  | $ | 3,704,138 |  |  | $ | (413,816) |
| December 31, 2024
| Less than 12 Months |  | 12 Months or Longer |  | Total
(in thousands) | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses |  | Fair Value |  | Gross Unrealized Losses
U.S. Treasury securities | $ | 716,367 |  |  | $ | (4,824) |  |  | $ | — |  |  | $ | — |  |  | $ | 716,367 |  |  | $ | (4,824) |
U.S. Government agency securities | — |  |  | — |  |  | 29,163 |  |  | (830) |  |  | 29,163 |  |  | (830) |
Mortgage-backed securities issued by U.S. Government agencies | 716,268 |  |  | (8,431) |  |  | 577,468 |  |  | (112,958) |  |  | 1,293,736 |  |  | (121,389) |
Mortgage-backed securities issued by U.S. Government sponsored enterprises | 456,887 |  |  | (12,503) |  |  | 1,542,618 |  |  | (248,412) |  |  | 1,999,505 |  |  | (260,915) |
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | 29,040 |  |  | (820) |  |  | 521,161 |  |  | (106,432) |  |  | 550,201 |  |  | (107,252) |
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | 1,060,903 |  |  | (10,624) |  |  | 276,850 |  |  | (31,952) |  |  | 1,337,753 |  |  | (42,576) |
Corporate debt securities and other debt securities | — |  |  | — |  |  | 8,971 |  |  | (139) |  |  | 8,971 |  |  | (139) |
Total | $ | 2,979,465 |  |  | $ | (37,202) |  |  | $ | 2,956,231 |  |  | $ | (500,723) |  |  | $ | 5,935,696 |  |  | $ | (537,925) |
As of June 30, 2025, Synovus had 28 investment securities AFS in a loss position for less than 12 months and 208 investment securities AFS in a loss position for 12 months or longer. As of June 30, 2025, Synovus does not intend to sell investment securities AFS in an unrealized loss position prior to the recovery of the unrealized loss, which may not be until maturity. Additionally, Synovus is not currently aware of any circumstances which will require it to sell any of the AFS securities that are in an unrealized loss position prior to the respective securities' recovery of all such unrealized losses. As such, no write-downs to the amortized cost basis of the portfolio were recorded at June 30, 2025. At June 30, 2025, no ACL was established for investment securities AFS. Substantially all of the unrealized losses on the securities portfolio were the result of changes in market interest rates compared to the date the securities were acquired rather than the credit quality of the issuers or underlying loans. U.S. Treasury and agency securities and agency mortgage-backed securities are issued, guaranteed or otherwise supported by the United States government, an agency of the United States government, or a government sponsored enterprise. As of June 30, 2025, all investment securities HTM were rated investment grade or supported by U.S. government agencies and have no history of credit losses supporting the application of a zero-credit loss assumption and no allowance for credit losses. The amortized cost and fair value by contractual maturity of investment securities HTM and investment securities AFS at June 30, 2025 are shown below. The expected life of MBSs or CMOs may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. For purposes of the maturity table, MBSs and CMOs, which are not due at a single maturity date, have been classified based on the final contractual maturity date.
(in thousands) | Within One Year |  | 1 to 5 Years |  | 5 to 10 Years |  | More Than 10 Years |  | Total
Investment securities HTM |  |  |  |  |  |  |  |  |
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |  |  |  |  |  |  |  |
Amortized cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 2,502,639 |  |  | $ | 2,502,639 |
Fair value | — |  |  | — |  |  | — |  |  | 2,476,289 |  |  | 2,476,289 |
Investment securities AFS |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  |  |  |  |  |  |  |  |
Amortized cost | $ | 131,387 |  |  | $ | 887,761 |  |  | $ | 201,661 |  |  | $ | — |  |  | $ | 1,220,809 |
Fair value | 131,900 |  |  | 902,835 |  |  | 206,191 |  |  | — |  |  | 1,240,926 |
U.S. Government agency securities |  |  |  |  |  |  |  |  |
Amortized cost | — |  |  | 29,995 |  |  | — |  |  | — |  |  | 29,995 |
Fair value | — |  |  | 29,711 |  |  | — |  |  | — |  |  | 29,711 |
Mortgage-backed securities issued by U.S. Government agencies |  |  |  |  |  |  |  |  |
Amortized cost | — |  |  | 34 |  |  | 2 |  |  | 1,551,520 |  |  | 1,551,556 |
Fair value | — |  |  | 34 |  |  | 2 |  |  | 1,456,852 |  |  | 1,456,888 |
Mortgage-backed securities issued by U.S. Government sponsored enterprises |  |  |  |  |  |  |  |  |
Amortized cost | — |  |  | — |  |  | — |  |  | 2,239,222 |  |  | 2,239,222 |
Fair value | — |  |  | — |  |  | — |  |  | 2,041,389 |  |  | 2,041,389 |
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises |  |  |  |  |  |  |  |  |
Amortized cost | — |  |  | 11 |  |  | 7,867 |  |  | 616,085 |  |  | 623,963 |
Fair value | — |  |  | 11 |  |  | 7,718 |  |  | 527,940 |  |  | 535,669 |
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises |  |  |  |  |  |  |  |  |
Amortized cost | 9,549 |  |  | 1,541,359 |  |  | 899,958 |  |  | 16,825 |  |  | 2,467,691 |
Fair value | 9,436 |  |  | 1,550,689 |  |  | 910,364 |  |  | 14,585 |  |  | 2,485,074 |
Corporate debt securities and other debt securities |  |  |  |  |  |  |  |  |
Amortized cost | — |  |  | 9,160 |  |  | — |  |  | — |  |  | 9,160 |
Fair value | — |  |  | 9,167 |  |  | — |  |  | — |  |  | 9,167 |
Gross gains and gross losses on sales of investment securities AFS for the three and six months ended June 30, 2025 and 2024 are presented below. The specific identification method is used to reclassify gains and losses out of other comprehensive income (loss) at the time of sale.
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in thousands) | 2025 |  | 2024 |  | 2025 |  | 2024
Gross realized losses on sales | $ | — |  |  | $ | (256,660) |  |  | $ | — |  |  | $ | (256,660) |
Investment securities gains (losses), net | $ | — |  |  | $ | (256,660) |  |  | $ | — |  |  | $ | (256,660) |

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