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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, 2022 | Dec. 31, 2021
Debt Disclosure [Abstract] |  |
Total balance at December 31, | $ 603,384 | $ 200
Weighted average interest rate at December 31, | 4.51% | 0.08%
Maximum month-end balance during the year | $ 1,705,069 | $ 200
Average amount outstanding during the year | $ 466,254 | $ 8
Weighted average interest rate during the year | 2.32% | 0.00%

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