CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Interest income:
Loans, including fees	$ 657,811	$ 701,570	$ 1,306,063	$ 1,393,285
Investment securities	93,720	78,891	187,072	150,797
Loans held for sale	1,098	1,132	1,855	1,710
Federal Reserve Bank balances	15,911	15,630	37,177	30,661
Other earning assets	3,102	4,019	6,240	7,499
Total interest income	771,642	801,242	1,538,407	1,583,952
Interest expense:
Deposits	278,309	335,754	560,634	668,420
Long-term debt	33,586	28,390	63,434	57,985
Federal funds purchased, securities sold under repurchase agreements, and other short-term borrowings	186	2,100	394	3,703
Total interest expense	312,081	366,244	624,462	730,108
Net interest income	459,561	434,998	913,945	853,844
Provision for (reversal of) credit losses	3,245	26,404	14,166	80,384
Net interest income after provision for (reversal of) credit losses	456,316	408,594	899,779	773,460
Non-interest revenue:
Service charges on deposit accounts	25,258	22,907	48,372	44,720
Fiduciary and asset management fees	20,332	19,728	40,249	38,741
Card fees	20,132	19,418	41,359	38,904
Brokerage revenue	20,748	20,457	41,107	43,164
Mortgage banking income	4,435	3,944	7,773	7,362
Capital markets income	12,960	15,077	19,901	21,704
Income from bank-owned life insurance	10,279	8,097	18,363	15,444
Investment securities gains (losses), net	0	(256,660)	0	(256,660)
Other non-interest revenue	19,991	18,181	33,477	36,658
Total non-interest revenue	134,135	(128,851)	250,601	(9,963)
Non-interest expense:
Salaries and other personnel expense	192,182	179,407	377,692	367,928
Net occupancy, equipment, and software expense	48,589	46,415	97,241	93,223
Third-party processing and other services	23,535	21,783	45,409	42,041
Professional fees	10,197	15,655	19,976	23,286
FDIC insurance and other regulatory fees	7,534	6,493	16,078	30,312
Restructuring charges (reversals)	72	(658)	(1,220)	866
Other operating expense	33,592	32,706	68,559	66,886
Total non-interest expense	315,701	301,801	623,735	624,542
Income (loss) before income taxes	274,750	(22,058)	526,645	138,955
Income tax expense (benefit)	57,631	(7,378)	114,654	29,565
Net income (loss)	217,119	(14,680)	411,991	109,390
Less: Net income (loss) attributable to noncontrolling interest	(596)	(652)	(738)	(1,089)
Net income (loss) attributable to Synovus Financial Corp.	217,715	(14,028)	412,729	110,479
Less: Preferred stock dividends	11,395	9,713	22,718	19,398
Net income (loss) available to common shareholders	$ 206,320	$ (23,741)	$ 390,011	$ 91,081
Net income (loss) per common share, basic (in dollars per share)	$ 1.49	$ (0.16)	$ 2.79	$ 0.62
Net income (loss) per common share, diluted (in dollars per share)	$ 1.48	$ (0.16)	$ 2.77	$ 0.62
Weighted average common shares outstanding, basic (in shares)	138,891	145,565	139,783	145,998
Weighted average common shares outstanding, diluted (in shares)	139,502	145,565	140,770	146,568