Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) (Condensed Statements Of Income) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Expenses
Interest expense									$ 118,644	$ 109,408	$ 118,822
Other expenses									717,655	744,998	741,537
Income before income taxes	$ 90,741	$ 93,986	$ 88,034	$ 85,812	$ 78,929	$ 72,656	$ 73,950	$ 77,024	358,573	302,559	252,628
Dividends and accretion of discount on preferred stock									10,238	10,238	40,830
Net income available to common shareholders	$ 55,839	$ 55,369	$ 53,233	$ 51,404	$ 50,612	$ 44,229	$ 44,313	$ 45,857	215,844	185,011	118,553
Parent Company [Member]
Income
Cash dividends received from Synovus Bank									199,904	90,626	0
Cash distributions received from Synovus Bank									25,096	91,374	680,000
Interest income									8,865	14,262	15,366
Other income									(337)	(932)	(2,374)
Total income									233,528	195,330	692,992
Expenses
Interest expense									46,585	45,726	46,672
Other expenses									10,516	10,337	8,067
Total expenses									57,101	56,063	54,739
Income before income taxes									176,427	139,267	638,253
Allocated income tax benefit									(18,808)	(16,491)	(16,589)
Income before equity in undistributed income (loss) of subsidiaries									195,235	155,758	654,842
Equity in undistributed income (loss) of subsidiaries									30,847	39,491	(495,459)
Net income (loss) available to controlling interest									226,082	195,249	159,383
Dividends and accretion of discount on preferred stock									10,238	10,238	40,830
Net income available to common shareholders									$ 215,844	$ 185,011	$ 118,553