Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) - Condensed Statements Of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Expense
Interest expense	$ 278,887	$ 120,396	$ 291,747
Other expense	1,157,506	1,099,904	1,179,574
Net income	757,902	760,467	373,695
Less: Preferred stock dividends	33,163	33,163	33,163
Net income available to common shareholders	724,739	727,304	340,532
Parent Company
Income
Cash dividends received from subsidiaries	350,000	420,000	547,500
Interest income	1,841	777	3,341
Other income (loss)	(7,203)	1,070	4,966
Total income	344,638	421,847	555,807
Expense
Interest expense	34,154	27,616	42,911
Other expense	17,804	10,300	10,584
Total expense	51,958	37,916	53,495
Income before income taxes and equity in undistributed income of subsidiaries	292,680	383,931	502,312
Allocated income tax benefit	(16,667)	(7,834)	(12,202)
Income before equity in undistributed income of subsidiaries	309,347	391,765	514,514
Equity in undistributed income (loss) of subsidiaries	448,555	368,702	(140,819)
Net income	757,902	760,467	373,695
Less: Preferred stock dividends	33,163	33,163	33,163
Net income available to common shareholders	$ 724,739	$ 727,304	$ 340,532