Condensed Financial Information Of Synovus Financial Corp. (Parent Company Only) (Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets [Abstract]
Cash due from bank subsidiary	$ 367,092	$ 485,489
Other assets	650,645	615,884
Total assets	28,792,653	27,050,237
Liabilities and Shareholders' Equity
Long-term debt	2,186,893	2,139,325
Other liabilities	185,878	211,026
Total liabilities	25,792,457	24,008,967
Shareholders’ equity:
Series C Preferred Stock – no par value. 5,200,000 shares outstanding at December 31, 2015 and December 31, 2014	125,980	125,980
Common stock	140,592	139,950
Additional paid-in capital	2,989,981	2,960,825
Treasury stock	(401,511)	(187,774)
Accumulated other comprehensive loss, net	(29,819)	(12,605)	$ (41,258)	$ 4,101
Retained earnings	174,973	14,894
Total shareholders’ equity	3,000,196	3,041,270
Total liabilities and shareholders' equity	28,792,653	27,050,237
Parent Company [Member]
Assets [Abstract]
Cash due from bank subsidiary	369,564	234,399
Funds due from other depository institutions	19,911	19,911
Investment in consolidated bank subsidiary, at equity	3,339,233	3,307,353
Investment in consolidated nonbank subsidiaries, at equity	71,350	(247,669)
Notes receivable from nonbank subsidiaries	67,000	399,168
Other assets	105,513	120,129
Total assets	3,972,571	3,833,291
Liabilities and Shareholders' Equity
Long-term debt	960,185	762,272
Other liabilities	12,190	29,749
Total liabilities	972,375	792,021
Shareholders’ equity:
Series C Preferred Stock – no par value. 5,200,000 shares outstanding at December 31, 2015 and December 31, 2014	125,980	125,980
Common stock	140,592	139,950
Additional paid-in capital	2,989,981	2,960,825
Treasury stock	(401,511)	(187,774)
Accumulated other comprehensive loss, net	(29,819)	(12,605)
Retained earnings	174,973	14,894
Total shareholders’ equity	3,000,196	3,041,270
Total liabilities and shareholders' equity	$ 3,972,571	$ 3,833,291