Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Summary of Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Other assets	$ 331,345	$ 280,212
Total Assets	14,580,249	12,145,762
Liabilities and Shareholders' Equity
Long-term debt	106,302	84,533
Other liabilities	164,353	149,830
Shareholders' equity	2,108,086	1,607,775	$ 1,310,736	$ 1,130,402
Total Liabilities & Shareholders' Equity	14,580,249	12,145,762
Parent Company
Assets
Cash	466	58
Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days	101,191	111,698
Investment in subsidiaries	2,109,341	1,578,786
Other assets	4,837	2,335
Total Assets	2,215,835	1,692,877
Liabilities and Shareholders' Equity
Long-term debt	106,302	84,533
Other liabilities	1,551	673
Shareholders' equity	2,107,982	1,607,671
Total Liabilities & Shareholders' Equity	$ 2,215,835	$ 1,692,877