Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Summary of Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income
Total Interest Income	$ 688,975	$ 380,494	$ 284,244
Interest expense	200,735	14,332	8,219
Other expenses	29,155	23,690	16,341
Income Before Income Taxes	134,252	138,136	158,738
Income tax benefit	30,219	31,629	34,335
Net Income	104,033	106,507	124,403
Parent Company
Income
Interest/other	3,573	897	167
Dividends from subsidiary Bank	40,655	48,424	47,684
Total Interest Income	44,228	49,321	47,851
Interest expense	7,408	3,090	1,683
Other expenses	996	1,023	765
Total expenses	8,404	4,113	2,448
Income Before Income Taxes	35,824	45,208	45,403
Income tax benefit	(1,015)	(675)	(481)
Income before equity in undistributed income of subsidiaries	36,839	45,883	45,884
Equity in undistributed income of subsidiaries	67,194	60,624	78,519
Net Income	$ 104,033	$ 106,507	$ 124,403