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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
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%