Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) (Condensed Statements of Cash Flows) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities
Net loss attributable to controlling interest	$ 159,383,000	$ 830,209,000	$ (60,624,000)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Share-based compensation	7,465,000	9,399,000	6,029,000
Net cash provided by operating activities	604,526,000	472,131,000	645,707,000
Investing Activities
Purchases of investment securities available for sale	(1,434,322,000)	(1,803,738,000)	(3,309,605,000)
Purchases of premises and equipment	(31,569,000)	(30,485,000)	(15,944,000)
Proceeds from sales of investment securities available for sale	407,718,000	1,139,558,000	2,002,922,000
Net cash (used) provided by investing activities	(27,586,000)	818,056,000	2,265,937,000
Financing Activities
Transfer of funds to dividend payment agent	0	(7,853,000)	0
Principal repayments on long-term debt	(307,571,000)	(491,049,000)	(601,415,000)
Proceeds from issuance of long-term debt	617,500,000	860,000,000	165,000,000
Proceeds from issuance of Series C Preferred Stock, net of issuance costs	125,862,000	0	0
Redemption of Series A Preferred Stock	(967,870,000)	0	0
Proceeds from issuance of common stock, net of issuance costs	175,174,000	0	0
Net cash used in financing activities	(721,940,000)	(1,185,980,000)	(2,790,242,000)
(Decrease) increase in cash and cash equivalents	(145,000,000)	104,207,000	121,402,000
Cash and cash equivalents at beginning of year	614,630,000	510,423,000	389,021,000
Cash and cash equivalents at end of year	469,630,000	614,630,000	510,423,000
Income tax payments (refunds), net	(2,577,000)	7,734,000	5,113,000
Interest paid	121,291,000	160,329,000	233,966,000
Parent Company [Member]
Operating Activities
Net loss attributable to controlling interest	159,383,000	830,209,000	(60,624,000)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Equity in undistributed loss of subsidiaries	495,459,000	(810,817,000)	55,311,000
Deferred income tax (benefit) expense	(11,375,000)	(48,525,000)	0
Net (decrease) increase in other liabilities	11,845,000	23,367,000	(23,162,000)
Net (increase) decrease in other assets	(11,238,000)	(1,255,000)	(4,780,000)
Other, net	(2,183,000)	(6,337,000)	(6,912,000)
Net cash provided by operating activities	641,891,000	(13,358,000)	(40,167,000)
Investing Activities
Net investment from (in) subsidiaries	0	0	10,000,000
Purchases of investment securities available for sale	0	0	(18,313,000)
Proceeds from sales of investment securities available for sale	0	0	49,551,000
Net (increase) decrease in short-term notes receivable from non-bank subsidiaries	5,768,000	49,865,000	107,944,000
Net cash (used) provided by investing activities	5,768,000	49,865,000	149,182,000
Financing Activities
Dividends paid to common and preferred shareholders	(72,898,000)	(79,856,000)	(79,813,000)
Transfer of funds to dividend payment agent	0	(7,853,000)	0
Principal repayments on long-term debt	(74,178,000)	(170,801,000)	(21,701,000)
Proceeds from issuance of long-term debt	0	292,639,000	0
Proceeds from issuance of Series C Preferred Stock, net of issuance costs	125,862,000	0	0
Redemption of Series A Preferred Stock	(967,870,000)	0	0
Proceeds from issuance of common stock, net of issuance costs	175,174,000	0	0
Net cash used in financing activities	(813,910,000)	34,129,000	(101,514,000)
(Decrease) increase in cash and cash equivalents	(166,251,000)	70,636,000	7,501,000
Cash and cash equivalents at beginning of year	382,138,000	311,502,000	304,001,000
Cash and cash equivalents at end of year	215,887,000	382,138,000	311,502,000
Income tax payments (refunds), net	1,500,000	7,800,000	5,100,000
Interest paid	$ 49,100,000	$ 46,500,000	$ 40,100,000