Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Adjustments to reconcile net income to net cash provided by operating activities:
Net cash provided by operating activities		$ 538,052		$ 631,204		$ 465,887
Investing Activities
Proceeds from sales of investment securities available for sale		35,066		812,293		968,606
Net cash used in investing activities		(1,338,049)		(1,473,904)		(1,416,936)
Financing Activities
Repurchases of common stock		(175,072)		(175,079)		(263,084)
Repayments and redemption of long-term debt		(2,230,052)		(2,350,422)		(2,213,688)
Proceeds from issuance of long-term debt		2,280,000		1,771,866		1,875,000
Net proceeds from issuance of Series D Preferred Stock		195,140		0		0
Redemption of Series C Preferred Stock		(130,000)		0		0
Earnout payment		(1,220)		(892)		0
Net cash provided by financing activities		1,010,628		776,588		665,911
Increase (decrease) in cash and cash equivalents including restricted cash		210,631		(66,112)		(285,138)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of year	[2]	932,933	[1]	999,045		1,284,183
Cash, cash equivalents, restricted cash, and restricted cash equivalents at end of year	[2]	1,143,564	[1]	932,933	[1]	999,045
Income taxes, net		41,008		18,040		9,340
Interest		180,241		143,237		123,560
Parent Company
Operating Activities
Net income		428,476		275,474		246,784
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed (income) loss of subsidiaries		(203,729)		129,858		37,521
Deferred income tax expense		1,055		60,931		17,989
Net increase (decrease) in other liabilities		9,551		(1,095)		7,746
Net decrease (increase) in other assets		6,723		(8)		(9,214)
Other, net		1,115		(3,330)		(1,648)
Net cash provided by operating activities		243,191		461,830		299,178
Investing Activities
Proceeds from sales of investment securities available for sale		0		4,305		0
Net cash received (used) in acquisitions/dispositions		0		0		(3,408)
Net decrease in short-term notes receivable from non-bank subsidiaries		0		35,200		31,800
Net cash used in investing activities		0		39,505		28,392
Financing Activities
Dividends paid to common and preferred shareholders		(120,202)		(64,908)		(69,663)
Repurchases of common stock		(175,072)		(175,079)		(263,084)
Repayments and redemption of long-term debt		0		(600,386)		(130,048)
Proceeds from issuance of long-term debt		0		296,866		0
Net proceeds from issuance of Series D Preferred Stock		195,140		0		0
Redemption of Series C Preferred Stock		(130,000)		0		0
Earnout payment		(1,220)		(892)		0
Net cash provided by financing activities		(231,354)		(544,399)		(462,795)
Increase (decrease) in cash and cash equivalents including restricted cash		11,837		(43,064)		(135,225)
Cash, cash equivalents, restricted cash, and restricted cash equivalents at beginning of year		211,186		254,250		389,475
Cash, cash equivalents, restricted cash, and restricted cash equivalents at end of year		223,023		211,186		254,250
Income taxes, net		41,700		18,000		9,500
Interest		$ 24,200		$ 51,000		$ 53,100

[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.