Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Schedule of Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets
Other assets	$ 431,169	$ 325,485
Total Assets	20,842,331	15,176,308
Liabilities, Convertible Preferred Stock and Shareholders' Equity
Other liabilities	193,437	166,601
Convertible preferred stock	343,125	0	$ 0	$ 0
Shareholders' equity	2,712,662	2,183,243	$ 2,108,086	$ 1,607,775
Total Liabilities, Convertible Preferred Stock & Shareholders' Equity	20,842,331	15,176,308
Parent Company
Assets
Cash	1,433	96
Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days	96,859	95,734
Investment in subsidiaries	3,046,818	2,190,338
Other assets	8,216	5,879
Total Assets	3,153,326	2,292,047
Liabilities, Convertible Preferred Stock and Shareholders' Equity
Long-term debt	95,161	106,966
Other liabilities	2,482	1,941
Convertible preferred stock	343,125	0
Shareholders' equity	2,712,558	2,183,140
Total Liabilities, Convertible Preferred Stock & Shareholders' Equity	$ 3,153,326	$ 2,292,047