Condensed Financial Statements of United Community Banks, Inc. (Holding Company Only) - Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Operations
Dividends from Bank	$ 217,000	$ 150,000
Interest expense	29,760	56,237	$ 83,312
Income tax benefit	(77,962)	(45,356)	(52,991)
Net income	269,801	164,089	185,721
Holding Company
Statement of Operations
Dividends from Bank	217,000	150,000	0
Dividends from other subsidiaries	0	0	4,651
Shared service fees from subsidiaries	12,402	13,020	14,721
Other	3,167	1,436	1,468
Total income	232,569	164,456	20,840
Interest expense	14,324	13,994	11,573
Other expense	16,417	16,473	18,965
Total expenses	30,741	30,467	30,538
Income tax benefit	6,908	2,681	8,711
Income (loss) before equity in undistributed earnings of subsidiaries	208,736	136,670	(987)
Equity in undistributed earnings of subsidiaries	61,065	27,419	186,708
Net income	$ 269,801	$ 164,089	$ 185,721