Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Summary of Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	$ 104,033	$ 106,507	$ 124,403
Net increase in other assets	(8,967)	508	(42,437)
Net increase in other liabilities	(8,755)	22,042	28,883
Net Cash Provided by Operating Activities	150,613	195,859	154,572
Cash Flows From Investing Activities
Net Cash Provided by (Used in) Investing Activities	527,446	(364,875)	(412,511)
Cash Flows From Financing Activities
Dividends paid	(60,591)	(41,242)	(22,506)
Stock based employee benefit plans	5,100	3,408	5,022
Repurchase of common stock	(10,868)	0	0
Net Cash (Used in) Provided by Financing Activities	(432,817)	(366,773)	591,580
Net increase (decrease) in cash and cash equivalents	245,242	(535,789)	333,641
Cash and Cash Equivalents at Beginning of Year	201,940	737,729	404,088
Cash and Cash Equivalents at End of Year	447,182	201,940	737,729
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	191,225	13,743	9,977
Parent Company
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	104,033	106,507	124,403
Equity in undistributed income of subsidiaries	(67,194)	(60,624)	(78,519)
Net increase in other assets	(3,029)	(13,823)	(489)
Net increase in other liabilities	22,646	499	400
Net Cash Provided by Operating Activities	56,456	32,559	45,795
Cash Flows From Investing Activities
Net cash from bank acquisitions	10,237	17,610	0
Net advances with subsidiary	270	(13,300)	(28,324)
Net Cash Provided by (Used in) Investing Activities	10,507	4,310	(28,324)
Cash Flows From Financing Activities
Dividends paid	(60,591)	(41,242)	(22,506)
Stock based employee benefit plans	4,904	4,374	5,022
Repurchase of common stock	(10,868)	0	0
Net Cash (Used in) Provided by Financing Activities	(66,555)	(36,868)	(17,484)
Net increase (decrease) in cash and cash equivalents	408	1	(13)
Cash and Cash Equivalents at Beginning of Year	58	57	70
Cash and Cash Equivalents at End of Year	466	58	57
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	$ 5,315	$ 2,890	$ 1,441