Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Summary of Statements of Income (Loss) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income
Gain on sale of Visa stock	$ 15,200	$ 0	$ 15,153	$ 0
Total Interest Income		241,398	191,596	148,055
Interest expense		29,883	15,300	8,467
Other expenses		17,222	15,535	13,515
Income tax provision (benefit)		20,259	36,336	14,889
Net Income		67,275	42,865	29,202
Parent Company
Income
Interest/other		484	2,104	352
Dividends from subsidiary Bank		0	0	0
Gain on sale of Visa stock		0	15,153	0
Total Interest Income		484	17,257	352
Interest expense		3,165	2,499	2,115
Other expenses		879	649	462
Income (loss) before income taxes and equity in undistributed income of subsidiaries		(3,560)	14,109	(2,225)
Income tax provision (benefit)		(747)	4,938	(801)
Income (loss) before equity in undistributed income of subsidiaries		(2,813)	9,171	(1,424)
Equity in undistributed income of subsidiaries		70,088	33,694	30,626
Net Income		$ 67,275	$ 42,865	$ 29,202