Goodwill And Other Intangible Assets (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) reporting_unit	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 01, 2016 USD ($)
Goodwill [Line Items]
Goodwill	$ 57,315	$ 59,678
Number of reporting units | reporting_unit	2
Aggregate estimated amortization expense in 2018	$ 1,200
Aggregate estimated amortization expense in 2019	1,200
Aggregate estimated amortization expense in 2020	1,200
Aggregate estimated amortization expense in 2021	1,200
Aggregate estimated amortization expense in 2022	1,200
Global One
Goodwill [Line Items]
Goodwill				$ 32,884
Intangible assets	$ 12,500			$ 12,500
Weighted average amortization period	10 years 9 months 18 days
Accumulated amortization	$ 1,100	521	$ 503
Trust Services Reporting Unit
Goodwill [Line Items]
Goodwill	24,431	24,431
Synovus Bank Reporting Unit
Goodwill [Line Items]
Goodwill	$ 32,884	$ 35,247