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Other Short-term Borrowings and Long-term Debt - Additional Information on Synovus' Short-term Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Debt Disclosure [Abstract] |  |
Total balance at December 31, | $ 3,496 | $ 603,384
Weighted average interest rate at December 31, | 3.88% | 4.51%
Maximum month-end balance during the year | $ 1,253,521 | $ 1,705,069
Average amount outstanding during the year | $ 528,194 | $ 466,254
Weighted average interest rate during the year | 4.60% | 2.32%

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