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, 2022	Dec. 31, 2021	Dec. 31, 2020
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	$ 106,507	$ 124,403	$ 77,764
Net (increase) decrease in other assets	508	(42,437)	(35,555)
Net increase in other liabilities	22,042	28,883	18,776
Net Cash Provided by Operating Activities	195,859	154,572	60,652
Cash Flows From Investing Activities
Net Cash Used in Investing Activities	(364,875)	(412,511)	(342,502)
Cash Flows From Financing Activities
Dividends paid	(41,242)	(22,506)	0
Stock based employee benefit plans	3,408	5,022
Stock based employee benefit plans			(1,486)
Net Cash (Used in) Provided by Financing Activities	(366,773)	591,580	561,407
Net (decrease) increase in cash and cash equivalents	(535,789)	333,641	279,557
Cash and Cash Equivalents at Beginning of Year	737,729	404,088	124,531
Cash and Cash Equivalents at End of Year	201,940	737,729	404,088
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	13,743	9,977	23,548
Parent Company
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	106,507	124,403	77,764
Equity in undistributed income of subsidiaries	(60,624)	(78,519)	(59,749)
Net (increase) decrease in other assets	(13,823)	(489)	1,772
Net increase in other liabilities	499	400	256
Net Cash Provided by Operating Activities	32,559	45,795	20,043
Cash Flows From Investing Activities
Net cash from bank acquisitions	17,610	0	(1,462)
Net advances with subsidiary	(13,300)	(28,324)	(17,095)
Net Cash Used in Investing Activities	4,310	(28,324)	(18,557)
Cash Flows From Financing Activities
Dividends paid	(41,242)	(22,506)	0
Stock based employee benefit plans	4,374
Stock based employee benefit plans		5,022	(1,486)
Net Cash (Used in) Provided by Financing Activities	(36,868)	(17,484)	(1,486)
Net (decrease) increase in cash and cash equivalents	1	(13)	0
Cash and Cash Equivalents at Beginning of Year	57	70	70
Cash and Cash Equivalents at End of Year	58	57	70
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	$ 2,890	$ 1,441	$ 1,992