Goodwill And Other Intangible Assets (Schedule of Goodwill) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Goodwill [Roll Forward]
Goodwill	$ 59,678
Accumulated impairment losses	0
Measurement period adjustments	(2,363)
Goodwill	57,315
Trust Services Reporting Unit
Goodwill [Roll Forward]
Goodwill	24,431
Accumulated impairment losses	0
Measurement period adjustments	0
Goodwill	24,431
Synovus Bank Reporting Unit
Goodwill [Roll Forward]
Goodwill	35,247
Accumulated impairment losses	0
Measurement period adjustments	(2,363)
Goodwill	$ 32,884