Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
ASSETS
Cash due from bank subsidiary		$ 468,426		$ 397,848
Total cash, cash equivalents, restricted cash, and restricted cash equivalents	[2]	1,143,564	[1]	932,933	[1]	$ 999,045	$ 1,284,183
Other assets		604,084		513,487
Total assets		32,669,192		31,221,837
Liabilities and Shareholders' Equity
Long-term debt		1,657,157		1,606,138
Other liabilities		270,419		245,043
Total liabilities		29,535,590		28,260,271
Shareholders’ equity:
Common stock		143,300		142,678
Additional paid-in capital		3,060,561		3,043,129
Treasury stock		(1,014,746)		(839,674)
Accumulated other comprehensive loss, net		(94,420)		(54,754)
Retained earnings		843,767		544,207
Total shareholders’ equity		3,133,602		2,961,566		2,927,924	3,000,196
Total liabilities and shareholders' equity		32,669,192		31,221,837
Series C Preferred Stock
Shareholders’ equity:
Preferred Stock		0		125,980
Series D Preferred Stock
Shareholders’ equity:
Preferred Stock		195,140		0
Parent Company
ASSETS
Cash due from bank subsidiary		213,096		191,275
Funds due from other depository institutions		9,927		19,911
Total cash, cash equivalents, restricted cash, and restricted cash equivalents		223,023		211,186		$ 254,250	$ 389,475
Investment in consolidated bank subsidiary, at equity		3,418,471		3,232,129
Investment in consolidated nonbank subsidiaries, at equity		34,586		40,731
Other assets		62,915		69,762
Total assets		3,738,995		3,553,808
Liabilities and Shareholders' Equity
Long-term debt		555,704		554,589
Other liabilities		49,689		37,653
Total liabilities		605,393		592,242
Shareholders’ equity:
Common stock		143,300		142,678
Additional paid-in capital		3,060,561		3,043,129
Treasury stock		(1,014,746)		(839,674)
Accumulated other comprehensive loss, net		(94,420)		(54,754)
Retained earnings		843,767		544,207
Total shareholders’ equity		3,133,602		2,961,566
Total liabilities and shareholders' equity		3,738,995		3,553,808
Parent Company | Series C Preferred Stock
Shareholders’ equity:
Preferred Stock		0		125,980
Parent Company | Series D Preferred Stock
Shareholders’ equity:
Preferred Stock		$ 195,140		$ 0

[1] See "Note 1 - Summary of Significant Accounting Policies" of this Report for information on Synovus' change in presentation of cash and cash equivalents.

[2] See "Note 1 - Summary of Significant Accounting Policies" of this Report for information on Synovus' change in presentation of cash and cash equivalents.See accompanying notes to the audited consolidated financial statements.