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Investment Securities Available for Sale
 3 Months Ended
Mar. 31, 2024
Investments [Abstract]  
Investment Securities Available for Sale
Note 2 - Investment Securities Available for Sale
The amortized cost, gross unrealized gains and losses, and estimated fair values of investment securities available for sale at March 31, 2024 and December 31, 2023 are summarized below.
March 31, 2024
(in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
U.S. Treasury securities$616,037 $505 $(1,133)$615,409 
U.S. Government agency securities29,993 — (1,210)28,783 
Mortgage-backed securities issued by U.S. Government agencies 1,022,881 1,119 (112,082)911,918 
Mortgage-backed securities issued by U.S. Government sponsored enterprises 7,383,405 328 (1,200,822)6,182,911 
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 676,772 — (111,832)564,940 
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises1,414,621 5,512 (38,403)1,381,730 
Corporate debt securities and other debt securities9,034 — (210)8,824 
Total investment securities available for sale(1)
$11,152,743 $7,464 $(1,465,692)$9,694,515 
December 31, 2023
(in thousands)Amortized CostGross Unrealized GainsGross Unrealized LossesFair Value
U.S. Treasury securities$588,082 $9,547 $— $597,629 
U.S. Government agency securities29,993 — (1,053)28,940 
Mortgage-backed securities issued by U.S. Government agencies 1,021,612 2,037 (97,985)925,664 
Mortgage-backed securities issued by U.S. Government sponsored enterprises 7,523,399 1,192 (1,094,212)6,430,379 
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises 692,487 — (104,892)587,595 
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises1,226,672 18,764 (35,653)1,209,783 
Corporate debt securities and other debt securities9,009 — (337)8,672 
Total investment securities available for sale(1)
$11,091,254 $31,540 $(1,334,132)$9,788,662 
(1) The amounts reported exclude accrued interest receivable on investment securities available for sale of $28.7 million and $26.6 million at March 31, 2024 and December 31, 2023, respectively, which is presented as a component of other assets on the consolidated balance sheets.
At March 31, 2024 and December 31, 2023, investment securities with a carrying value of $5.02 billion and $5.19 billion, respectively, were pledged to secure certain deposits and other liabilities, as required by law or contractual agreements.            
On April 1, 2024, Synovus transferred $3.42 billion of mortgage-backed securities from available for sale to held to maturity, and AOCI included a pre-tax unrealized loss of $708.5 million on the investment securities at the date of the transfer. See Note 10 - Subsequent Event in this Report for additional information on the transfer of mortgage-backed securities from available for sale to held to maturity.
Gross unrealized losses on investment securities 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 March 31, 2024 and December 31, 2023 are presented below.
March 31, 2024
Less than 12 Months12 Months or LongerTotal
(in thousands)Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
U.S. Treasury securities$465,387 $(1,133)$— $— $465,387 $(1,133)
U.S. Government agency securities— — 28,783 (1,210)28,783 (1,210)
Mortgage-backed securities issued by U.S. Government agencies 132,795 (712)696,870 (111,370)829,665 (112,082)
Mortgage-backed securities issued by U.S. Government sponsored enterprises 129,505 (2,158)6,005,861 (1,198,664)6,135,366 (1,200,822)
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — 564,940 (111,832)564,940 (111,832)
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises360,736 (1,874)274,840 (36,529)635,576 (38,403)
Corporate debt securities and other debt securities— — 8,824 (210)8,824 (210)
Total$1,088,423 $(5,877)$7,580,118 $(1,459,815)$8,668,541 $(1,465,692)
December 31, 2023
Less than 12 Months12 Months or LongerTotal
(in thousands)Fair ValueGross Unrealized LossesFair ValueGross Unrealized LossesFair ValueGross Unrealized Losses
U.S. Government agency securities$— $— $28,940 $(1,053)$28,940 $(1,053)
Mortgage-backed securities issued by U.S. Government agencies 159,402 (1,268)565,358 (96,717)724,760 (97,985)
Mortgage-backed securities issued by U.S. Government sponsored enterprises 215,917 (1,193)6,045,914 (1,093,019)6,261,831 (1,094,212)
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — — 587,595 (104,892)587,595 (104,892)
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises34,406 (205)276,675 (35,448)311,081 (35,653)
Corporate debt securities and other debt securities— — 8,672 (337)8,672 (337)
Total$409,725 $(2,666)$7,513,154 $(1,331,466)$7,922,879 $(1,334,132)
As of March 31, 2024, Synovus had 29 investment securities in a loss position for less than 12 months and 353 investment securities in a loss position for 12 months or longer and did not intend to sell investment securities in an unrealized loss position prior to the recovery of the unrealized loss, which may not be until maturity, and has the ability and intent to hold those securities for that period of time. Additionally, as of March 31, 2024, Synovus was not aware of any circumstances which will require it to sell any of the 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 for the period.
At March 31, 2024, no ACL was established for investment securities. 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.
The amortized cost and fair value by contractual maturity of investment securities available for sale at March 31, 2024 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.
Distribution of Maturities at March 31, 2024
(in thousands)Within One
 Year		1 to 5
Years		5 to 10
 Years		More Than
 10 Years		Total
Amortized Cost
U.S. Treasury securities$25,923 $258,854 $331,260 $— $616,037 
U.S. Government agency securities— 29,993 — — 29,993 
Mortgage-backed securities issued by U.S. Government agencies — 60 3 1,022,818 1,022,881 
Mortgage-backed securities issued by U.S. Government sponsored enterprises — — 10,552 7,372,853 7,383,405 
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — 41 9,865 666,866 676,772 
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises66,440 783,017 547,840 17,324 1,414,621 
Corporate debt securities and other debt securities— 9,034 — — 9,034 
Total amortized cost$92,363 $1,080,999 $899,520 $9,079,861 $11,152,743 
Fair Value
U.S. Treasury securities$25,923 $258,488 $330,998 $— $615,409 
U.S. Government agency securities— 28,783 — — 28,783 
Mortgage-backed securities issued by U.S. Government agencies — 58 3 911,857 911,918 
Mortgage-backed securities issued by U.S. Government sponsored enterprises — — 9,766 6,173,145 6,182,911 
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises — 40 9,491 555,409 564,940 
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises66,750 775,293 524,691 14,996 1,381,730 
Corporate debt securities and other debt securities— 8,824 — — 8,824 
Total fair value$92,673 $1,071,486 $874,949 $7,655,407 $9,694,515 
Gross gains and gross losses on sales of securities available for sale for the three months ended March 31, 2024 and 2023 are presented below. The specific identification method is used to reclassify gains and losses out of other comprehensive income (loss) at the time of sale.
Three Months Ended March 31,
(in thousands)20242023
Gross realized gains on sales$— $1,030 
Gross realized losses on sales— — 
Investment securities gains (losses), net$— $1,030