Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Summary of Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Other assets	$ 280,212	$ 201,857
Total Assets	12,145,762	9,681,433
Liabilities and Shareholders' Equity
Subordinated debt	84,533	71,646
Other liabilities	149,830	109,897
Shareholders' equity	1,607,775	1,310,736	$ 1,130,402	$ 985,639
Total Liabilities & Shareholders' Equity	12,145,762	9,681,433
Parent Company
Assets
Cash	58	57
Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days	111,698	98,398
Investment in subsidiaries	1,578,786	1,286,478
Other assets	2,335	1,140
Total Assets	1,692,877	1,386,073
Liabilities and Shareholders' Equity
Subordinated debt	84,533	71,646
Other liabilities	673	3,795
Shareholders' equity	1,607,671	1,310,632
Total Liabilities & Shareholders' Equity	$ 1,692,877	$ 1,386,073