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Other Short-term Borrowings and Long-term Debt - Principal Payments on Long-term Debt (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
2024	$ 0
2025	1,050,000
2026	0
2027	0
2028	500,000
Thereafter	412,967
Total	1,962,967
Synovus Bank
Debt Instrument [Line Items]
2024	0
2025	700,000
2026	0
2027	0
2028	500,000
Thereafter	200,000
Total	1,400,000
Parent Company
Debt Instrument [Line Items]
2024	0
2025	350,000
2026	0
2027	0
2028	0
Thereafter	212,967
Total	$ 562,967

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