Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Summary of Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income
Total Interest Income	$ 284,244	$ 287,035	$ 289,823
Interest expense	8,219	24,292	46,205
Other expenses	16,341	15,835	15,177
Income tax benefit	34,335	22,818	29,873
Net Income	124,403	77,764	98,739
Parent Company
Income
Interest/other	167	270	679
Dividends from subsidiary Bank	47,684	20,230	18,084
Total Interest Income	47,851	20,500	18,763
Interest expense	1,683	2,236	3,368
Other expenses	765	838	651
Total expenses	2,448	3,074	4,019
Income before income taxes and equity in undistributed income of subsidiaries	45,403	17,426	14,744
Income tax benefit	(481)	(589)	(702)
Income before equity in undistributed income of subsidiaries	45,884	18,015	15,446
Equity in undistributed income of subsidiaries	78,519	59,749	83,293
Net Income	$ 124,403	$ 77,764	$ 98,739