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, 2024	Dec. 31, 2023	Dec. 31, 2022
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	$ 120,986	$ 104,033	$ 106,507
Net increase in other assets	(5,759)	(8,967)	508
Net increase in other liabilities	1,805	(8,755)	22,042
Net cash provided by operating activities	179,902	150,613	195,859
Cash Flows From Investing Activities
Net cash (used in) provided by investing activities	(606,884)	527,446	(364,875)
Cash Flows From Financing Activities
Dividends paid	(61,649)	(60,591)	(41,242)
Stock based employee benefit plans	945	5,100	3,408
Repurchase of common stock	(880)	(10,868)	0
Net cash provided by (used in) financing activities	456,407	(432,817)	(366,773)
Net increase (decrease) in cash and cash equivalents	29,425	245,242	(535,789)
Cash and cash equivalents at beginning of period	447,182	201,940	737,729
Cash and cash equivalents at end of period	476,607	447,182	201,940
Supplemental disclosure of cash flow information:
Cash paid for interest	287,272	191,225	13,743
Parent Company
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	120,986	104,033	106,507
Equity in undistributed income of subsidiaries	(65,257)	(67,194)	(60,624)
Net increase in other assets	(1,042)	(3,029)	(13,823)
Net increase in other liabilities	1,056	22,646	499
Net cash provided by operating activities	55,743	56,456	32,559
Cash Flows From Investing Activities
Net cash from bank acquisitions	0	10,237	17,610
Net advances with subsidiary	5,471	270	(13,300)
Net cash (used in) provided by investing activities	5,471	10,507	4,310
Cash Flows From Financing Activities
Dividends paid	(61,649)	(60,591)	(41,242)
Stock based employee benefit plans	945	4,904	4,374
Repurchase of common stock	(880)	(10,868)	0
Net cash provided by (used in) financing activities	(61,584)	(66,555)	(36,868)
Net increase (decrease) in cash and cash equivalents	(370)	408	1
Cash and cash equivalents at beginning of period	466	58	57
Cash and cash equivalents at end of period	96	466	58
Supplemental disclosure of cash flow information:
Cash paid for interest	$ 5,511	$ 5,315	$ 2,890