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Fair Value Accounting (Tables) | 9 Months Ended
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Sep. 30, 2024
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Estimated Fair Value on a Recurring Basis | The following table presents assets and liabilities measured at estimated fair value on a recurring basis.
| September 30, 2024 |  |  | December 31, 2023
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  | Total Estimated Fair Value |  |  | Level 1 |  | Level 2 |  | Level 3 |  | Total Estimated Fair Value
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trading securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities | $ | 154 |  |  | $ | — |  |  | $ | — |  |  | $ | 154 |  |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Collateralized mortgage obligations issued by U.S. Government sponsored enterprises | — |  |  | — |  |  | — |  |  | — |  |  |  | — |  |  | 2,910 |  |  | — |  |  | 2,910 |
Other mortgage-backed securities | — |  |  | — |  |  | — |  |  | — |  |  |  | — |  |  | 2,149 |  |  | — |  |  | 2,149 |
Asset-backed securities | — |  |  | 13,719 |  |  | — |  |  | 13,719 |  |  |  | — |  |  | 7,839 |  |  | — |  |  | 7,839 |
Total trading securities | $ | 154 |  |  | $ | 13,719 |  |  | $ | — |  |  | $ | 13,873 |  |  |  | $ | — |  |  | $ | 12,898 |  |  | $ | — |  |  | $ | 12,898 |
Investment securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities | $ | 1,214,363 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,214,363 |  |  |  | $ | 597,629 |  |  | $ | — |  |  | $ | — |  |  | $ | 597,629 |
U.S. Government agency securities | — |  |  | 29,613 |  |  | — |  |  | 29,613 |  |  |  | — |  |  | 28,940 |  |  | — |  |  | 28,940 |
Mortgage-backed securities issued by U.S. Government agencies | — |  |  | 1,525,091 |  |  | — |  |  | 1,525,091 |  |  |  | — |  |  | 925,664 |  |  | — |  |  | 925,664 |
Mortgage-backed securities issued by U.S. Government sponsored enterprises | — |  |  | 2,069,369 |  |  | — |  |  | 2,069,369 |  |  |  | — |  |  | 6,430,379 |  |  | — |  |  | 6,430,379 |
Collateralized mortgage obligations issued by U.S. Government agencies or sponsored enterprises | — |  |  | 585,388 |  |  | — |  |  | 585,388 |  |  |  | — |  |  | 587,595 |  |  | — |  |  | 587,595 |
Commercial mortgage-backed securities issued by U.S. Government agencies or sponsored enterprises | — |  |  | 2,121,613 |  |  | — |  |  | 2,121,613 |  |  |  | — |  |  | 1,209,783 |  |  | — |  |  | 1,209,783 |
Corporate debt securities and other debt securities | — |  |  | 8,731 |  |  | — |  |  | 8,731 |  |  |  | — |  |  | 8,672 |  |  | — |  |  | 8,672 |
Total investment securities available for sale | $ | 1,214,363 |  |  | $ | 6,339,805 |  |  | $ | — |  |  | $ | 7,554,168 |  |  |  | $ | 597,629 |  |  | $ | 9,191,033 |  |  | $ | — |  |  | $ | 9,788,662 |
Mortgage loans held for sale | $ | — |  |  | $ | 36,943 |  |  | $ | — |  |  | $ | 36,943 |  |  |  | $ | — |  |  | $ | 47,338 |  |  | $ | — |  |  | $ | 47,338 |
Other investments | — |  |  | — |  |  | 14,711 |  |  | 14,711 |  |  |  | — |  |  | — |  |  | 12,560 |  |  | 12,560 |
Mutual funds and mutual funds held in rabbi trusts | 62,901 |  |  | — |  |  | — |  |  | 62,901 |  |  |  | 53,742 |  |  | — |  |  | — |  |  | 53,742 |
Derivative assets | — |  |  | 84,673 |  |  | — |  |  | 84,673 |  |  |  | — |  |  | 94,903 |  |  | — |  |  | 94,903 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities sold short | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  |  | $ | 3,496 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,496 |
Mutual funds held in rabbi trusts | 47,484 |  |  | — |  |  | — |  |  | 47,484 |  |  |  | 38,735 |  |  | — |  |  | — |  |  | 38,735 |
Derivative liabilities | — |  |  | 175,413 |  |  | — |  |  | 175,413 |  |  |  | — |  |  | 259,650 |  |  | — |  |  | 259,650 |
Schedule of Mortgage Loans Held for Sale and Changes in Fair Value Included in Net Income | The following table summarizes the difference between the fair value and the UPB of mortgage loans held for sale and the changes in fair value of these loans. An immaterial portion of these changes in fair value was attributable to instrument-specific credit risk.
Mortgage Loans Held for Sale |
(in thousands) | As of September 30, 2024 |  | As of December 31, 2023
Fair value | $ | 36,943 |  |  | $ | 47,338 |
Unpaid principal balance | 35,801 |  |  | 45,627 |
Fair value less aggregate unpaid principal balance | $ | 1,142 |  |  | $ | 1,711 |
Changes in Fair Value Included in Net Income | Three Months Ended September 30, |  | Nine Months Ended September 30, |  | Location in Consolidated Statements of Income
(in thousands) | 2024 |  | 2023 |  | 2024 |  | 2023 |
Mortgage loans held for sale | $ | 205 |  |  | $ | (581) |  |  | $ | (569) |  |  | $ | (373) |  |  | Mortgage banking income
Schedule of Level 3 Assets Measured at Fair Value on a Recurring Basis | The following tables provide rollforwards of Level 3 assets measured at fair value on a recurring basis.
|  |  |  | Three Months Ended September 30, 2024
(in thousands) |  |  |  | Other Investments |  |  |  |
Beginning balance at June 30, 2024 |  |  |  | $ | 14,423 |  |  |  |  |
Total gains (losses) realized/unrealized: |  |  |  |  |  |  |  |
Included in earnings |  |  |  | 236 |  |  |  |  |
Additions |  |  |  | 52 |  |  |  |  |
Ending balance at September 30, 2024 |  |  |  | $ | 14,711 |  |  |  |  |
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets still held at September 30, 2024 |  |  |  | $ | 236 |  |  |  |  |
|  |  | Three Months Ended September 30, 2023
(in thousands) |  |  |  | Other Investments |  |  |  |
Beginning balance at June 30, 2023 |  |  |  | $ | 11,770 |  |  |  |  |
Total gains (losses) realized/unrealized: |  |  |  |  |  |  |  |
Included in earnings |  |  |  | (26) |  |  |  |  |
Additions |  |  |  | 45 |  |  |  |  |
Ending balance at September 30, 2023 |  |  |  | $ | 11,789 |  |  |  |  |
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets still held at September 30, 2023 |  |  |  | $ | (26) |  |  |  |  |
|  |  |  | Nine Months Ended September 30, 2024
(in thousands) |  |  |  | Other Investments |  |  |  |
Beginning balance at December 31, 2023 |  |  |  | $ | 12,560 |  |  |  |  |
Total gains (losses) realized/unrealized: |  |  |  |  |  |  |  |
Included in earnings |  |  |  | 671 |  |  |  |  |
Additions |  |  |  | 1,480 |  |  |  |  |
Ending balance at September 30, 2024 |  |  |  | $ | 14,711 |  |  |  |  |
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets still held at September 30, 2024 |  |  |  | $ | 671 |  |  |  |  |
|  |  |  | Nine Months Ended September 30, 2023
(in thousands) |  |  |  | Other Investments |  |  |  |
Beginning balance at December 31, 2022 |  |  |  | $ | 11,172 |  |  |  |  |
Total gains (losses) realized/unrealized: |  |  |  |  |  |  |  |
Included in earnings |  |  |  | (97) |  |  |  |  |
Additions |  |  |  | 714 |  |  |  |  |
Ending balance at September 30, 2023 |  |  |  | $ | 11,789 |  |  |  |  |
Total net gains (losses) for the period included in earnings attributable to the change in unrealized gains/(losses) relating to assets still held at September 30, 2023 |  |  |  | $ | (97) |  |  |  |  |
Schedule of Assets Measured at Fair Value on a Non-Recurring Basis | The following table presents assets measured at fair value on a non-recurring basis, as of the dates indicated, for which there was a fair value adjustment.
| September 30, 2024 |  | Fair Value Adjustments for the |  | Location in Consolidated Statements of Income
(in thousands) | Level 1 |  | Level 2 |  | Level 3 |  |  | Three Months Ended September 30, 2024 |  | Nine Months Ended September 30, 2024 |
Loans(1) | $ | — |  |  | $ | — |  |  | $ | 54,713 |  |  |  | $ | 10,085 |  |  | $ | 19,367 |  |  | Provision for (reversal of) credit losses
| September 30, 2023 |  | Fair Value Adjustments for the |  | Location in Consolidated Statements of Income
| Level 1 |  | Level 2 |  | Level 3 |  |  | Three Months Ended September 30, 2023 |  | Nine Months Ended September 30, 2023 |
Loans(1) | $ | — |  |  | $ | — |  |  | $ | 16,049 |  |  |  | $ | — |  |  | $ | 2,971 |  |  | Provision for (reversal of) credit losses
(1) Collateral-dependent loans that were written down to fair value of collateral.
Schedule of Carrying and Estimated Fair Values of Financial Instruments | The following tables present the carrying and estimated fair values of financial instruments at September 30, 2024 and December 31, 2023. The fair values represent management’s best estimates based on a range of methodologies and assumptions. See "Part II - Item 8. Financial Statements and Supplementary Data - Note 1 - Summary of Significant Accounting Policies" to the consolidated financial statements of Synovus' 2023 Form 10-K for a description of how fair value measurements are determined.
| September 30, 2024
(in thousands) | Carrying Value |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Financial assets |  |  |  |  |  |  |  |  |
Total cash, cash equivalents, and restricted cash | $ | 1,853,612 |  |  | $ | 1,853,612 |  |  | $ | 1,853,612 |  |  | $ | — |  |  | $ | — |
Trading securities | 13,873 |  |  | 13,873 |  |  | 154 |  |  | 13,719 |  |  | — |
Investment securities held to maturity | 2,622,457 |  |  | 2,727,898 |  |  | — |  |  | 2,727,898 |  |  | — |
Investment securities available for sale | 7,554,168 |  |  | 7,554,168 |  |  | 1,214,363 |  |  | 6,339,805 |  |  | — |
Loans held for sale | 121,470 |  |  | 121,255 |  |  | — |  |  | 36,943 |  |  | 84,312 |
Other investments | 14,711 |  |  | 14,711 |  |  | — |  |  | — |  |  | 14,711 |
Mutual funds and mutual funds held in rabbi trusts | 62,901 |  |  | 62,901 |  |  | 62,901 |  |  | — |  |  | — |
Loans, net (1) | 42,635,689 |  |  | 41,803,142 |  |  | — |  |  | — |  |  | 41,803,142 |
FRB and FHLB stock | 200,873 |  |  | 200,873 |  |  | — |  |  | 200,873 |  |  | — |
Derivative assets | 84,673 |  |  | 84,673 |  |  | — |  |  | 84,673 |  |  | — |
Financial liabilities |  |  |  |  |  |  |  |  |
Non-interest-bearing deposits | $ | 11,561,626 |  |  | $ | 11,561,626 |  |  | $ | — |  |  | $ | 11,561,626 |  |  | $ | — |
Non-time interest-bearing deposits | 28,103,562 |  |  | 28,103,562 |  |  | — |  |  | 28,103,562 |  |  | — |
Time deposits | 10,528,552 |  |  | 10,535,667 |  |  | — |  |  | 10,535,667 |  |  | — |
Total deposits (2) | $ | 50,193,740 |  |  | $ | 50,200,855 |  |  | $ | — |  |  | $ | 50,200,855 |  |  | $ | — |
Federal funds purchased and securities sold under repurchase agreements | 94,055 |  |  | 94,055 |  |  | 94,055 |  |  | — |  |  | — |
Long-term debt | 2,021,050 |  |  | 2,032,273 |  |  | — |  |  | 2,032,273 |  |  | — |
Mutual funds held in rabbi trusts | 47,484 |  |  | 47,484 |  |  | 47,484 |  |  | — |  |  | — |
Derivative liabilities | 175,413 |  |  | 175,413 |  |  | — |  |  | 175,413 |  |  | — |
(1) Synovus estimates the fair value of loans based on present value of the future cash flows using the interest rate that would be charged for a similar loan to a borrower with similar risk, adjusted for a discount based on the estimated time period to complete a sale transaction with a market participant. (2) The fair value of deposits with no stated maturity, such as non-interest-bearing demand, interest bearing demand, money market, and savings accounts reflects the carrying amount which is payable on demand, as of the respective date, and may not align with other valuation methods or processes. The fair value of time deposits is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities.
| December 31, 2023
(in thousands) | Carrying Value |  | Fair Value |  | Level 1 |  | Level 2 |  | Level 3
Financial assets |  |  |  |  |  |  |  |  |
Total cash, cash equivalents, and restricted cash | $ | 2,451,426 |  |  | $ | 2,451,426 |  |  | $ | 2,451,426 |  |  | $ | — |  |  | $ | — |
Trading securities | 12,898 |  |  | 12,898 |  |  | — |  |  | 12,898 |  |  | — |
Investment securities available for sale | 9,788,662 |  |  | 9,788,662 |  |  | 597,629 |  |  | 9,191,033 |  |  | — |
Loans held for sale | 52,768 |  |  | 52,770 |  |  | — |  |  | 47,338 |  |  | 5,432 |
Other investments | 12,560 |  |  | 12,560 |  |  | — |  |  | — |  |  | 12,560 |
Mutual funds and mutual funds held in rabbi trusts | 53,742 |  |  | 53,742 |  |  | 53,742 |  |  | — |  |  | — |
Loans, net (1) | 42,925,105 |  |  | 41,298,149 |  |  | — |  |  | — |  |  | 41,298,149 |
FRB and FHLB stock | 184,944 |  |  | 184,944 |  |  | — |  |  | 184,944 |  |  | — |
Derivative assets | 94,903 |  |  | 94,903 |  |  | — |  |  | 94,903 |  |  | — |
Financial liabilities |  |  |  |  |  |  |  |  |
Non-interest-bearing deposits | $ | 12,507,616 |  |  | $ | 12,507,616 |  |  | $ | — |  |  | $ | 12,507,616 |  |  | $ | — |
Non-time interest-bearing deposits | 27,449,088 |  |  | 27,449,088 |  |  | — |  |  | 27,449,088 |  |  | — |
Time deposits | 10,782,481 |  |  | 10,769,002 |  |  | — |  |  | 10,769,002 |  |  | — |
Total deposits (2) | $ | 50,739,185 |  |  | $ | 50,725,706 |  |  | $ | — |  |  | $ | 50,725,706 |  |  | $ | — |
Federal funds purchased and securities sold under repurchase agreements | 189,074 |  |  | 189,074 |  |  | 189,074 |  |  | — |  |  | — |
Securities sold short | 3,496 |  |  | 3,496 |  |  | 3,496 |  |  | — |  |  | — |
Long-term debt | 1,932,534 |  |  | 1,939,604 |  |  | — |  |  | 1,939,604 |  |  | — |
Mutual funds held in rabbi trusts | 38,735 |  |  | 38,735 |  |  | 38,735 |  |  | — |  |  | — |
Derivative liabilities | 259,650 |  |  | 259,650 |  |  | — |  |  | 259,650 |  |  | — |
(1) Synovus estimates the fair value of loans based on present value of the future cash flows using the interest rate that would be charged for a similar loan to a borrower with similar risk, adjusted for a discount based on the estimated time period to complete a sale transaction with a market participant. (2) The fair value of deposits with no stated maturity, such as non-interest-bearing demand, interest bearing demand, money market, and savings accounts reflects the carrying amount which is payable on demand, as of the respective date, and may not align with other valuation methods or processes. The fair value of time deposits is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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