Seacoast Banking Corporation of Florida (Parent Company Only) Financial Information - Schedule of Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	$ 144,878	$ 120,986	$ 104,033
Net increase in other assets	(26,430)	(5,759)	(8,967)
Net (decrease) increase in other liabilities	(42,942)	1,805	(8,755)
Net cash provided by operating activities	188,061	179,902	150,613
Cash Flows From Investing Activities
Net cash (used in) provided by investing activities	(706,763)	(606,884)	527,446
Cash Flows From Financing Activities
Dividends paid	(67,727)	(61,649)	(60,591)
Stock-based employee benefit plans	(1,353)	945	5,100
Repurchase of common stock	0	(880)	(10,868)
Net cash provided by (used in) financing activities	430,640	456,407	(432,817)
Net (decrease) increase in cash and cash equivalents	(88,062)	29,425	245,242
Cash and cash equivalents at beginning of period	476,607	447,182	201,940
Cash and cash equivalents at end of period	388,545	476,607	447,182
Supplemental disclosure of cash flow information:
Cash paid for interest	277,644	287,272	191,225
Parent Company
Adjustments to reconcile net income to net cash provided by operating activities:
Net Income	144,878	120,986	104,033
Equity in undistributed income of subsidiaries	178,309	(65,257)	(67,194)
Net increase in other assets	(2,283)	(1,042)	(3,029)
Net (decrease) increase in other liabilities	(11,656)	1,056	22,646
Net cash provided by operating activities	309,248	55,743	56,456
Cash Flows From Investing Activities
Net cash from bank acquisitions	(237,721)	0	10,237
Net advances with subsidiary	(1,110)	5,471	270
Net cash (used in) provided by investing activities	(238,831)	5,471	10,507
Cash Flows From Financing Activities
Dividends paid	(67,727)	(61,649)	(60,591)
Stock-based employee benefit plans	(1,353)	945	4,904
Repurchase of common stock	0	(880)	(10,868)
Net cash provided by (used in) financing activities	(69,080)	(61,584)	(66,555)
Net (decrease) increase in cash and cash equivalents	1,337	(370)	408
Cash and cash equivalents at beginning of period	96	466	58
Cash and cash equivalents at end of period	1,433	96	466
Supplemental disclosure of cash flow information:
Cash paid for interest	$ 4,753	$ 5,511	$ 5,315