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Long-term Debt and Short-term Borrowings (Schedule of Long-term Debt Instruments) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 11, 2020	Feb. 12, 2020	Dec. 31, 2019	Feb. 07, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt	$ 1,202,494,000			$ 2,153,897,000
Interest rate at period end	0.11%			1.60%		1.93%
3.125% Senior Notes due November 1, 2022
Debt Instrument [Line Items]
Debt, face amount	$ 300,000,000.0
Stated percentage	3.125%
5.90% Subordinated Notes, due February 7, 2029
Debt Instrument [Line Items]
Debt, face amount					$ 300,000,000.0
Stated percentage					5.90%
Senior Notes | 2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023
Debt Instrument [Line Items]
Debt, face amount			$ 400,000,000.0
Stated percentage			228.90%
FHLB Advances
Debt Instrument [Line Items]
FHLB advances with interest and principal payments due at various maturity dates through 2018		$ 1,130,000,000
Synovus Bank Reporting Unit
Debt Instrument [Line Items]
Other Long-term Debt	$ 145,000			$ 0
Long-term debt	596,088,000			1,300,000,000
Synovus Bank Reporting Unit | Four Percent Subordinated Notes, Due October 29, 2030
Debt Instrument [Line Items]
Subordinated notes	197,349,000			0
Synovus Bank Reporting Unit | Senior Notes | 2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023
Debt Instrument [Line Items]
Long-term debt	398,594,000			0
Synovus Bank Reporting Unit | FHLB Advances
Debt Instrument [Line Items]
FHLB advances with interest and principal payments due at various maturity dates through 2018	$ 0			$ 1,300,000,000
Weighted average interest rate	1.76%			2.53%
Synovus Bank Reporting Unit | FHLB Advances | Minimum
Debt Instrument [Line Items]
Stated percentage	1.66%
Synovus Bank Reporting Unit | FHLB Advances | Maximum
Debt Instrument [Line Items]
Stated percentage	1.97%
Parent Company
Debt Instrument [Line Items]
Long-term debt	$ 606,406,000			$ 853,897,000
Parent Company | 5.90% Subordinated Notes, due February 7, 2029
Debt Instrument [Line Items]
Subordinated notes	297,553,000			297,250,000
Debt, face amount	$ 300,000,000
Stated percentage	5.90%
Parent Company | 5.90% Subordinated Notes, due February 7, 2029 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	3.379%
Parent Company | LIBOR 1.80% debentures, due April 19, 2035
Debt Instrument [Line Items]
Unsecured debt	$ 10,000,000			$ 10,000,000
Debt, face amount	$ 10,000,000
Interest rate at period end	3.69%			4.59%
Parent Company | LIBOR 1.80% debentures, due April 19, 2035 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.80%
Parent Company | 5.75% Subordinated Notes, due December 15, 2025
Debt Instrument [Line Items]
Subordinated notes	$ 0			$ 248,419,000
Debt, face amount	$ 250,000,000
Stated percentage	5.75%
Parent Company | 5.75% Subordinated Notes, due December 15, 2025 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	4.182%
Parent Company | Senior Notes | 3.125% Senior Notes due November 1, 2022
Debt Instrument [Line Items]
Long-term debt	$ 298,853,000			$ 298,228,000

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