Regulatory Capital (Details) $ in Thousands	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital conservation buffer rate	2.50%
Parent Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-Based Capital Ratio (to risk-weighted assets), Amount	$ 2,246,521	$ 1,785,247
Tier 1 Capital Ratio (to risk-weighted assets), Amount	2,047,334	1,633,819
CET1 Capital Ratio (to risk-weighted assets), Amount	1,631,436	1,561,325
Leverage Ratio (to adjusted average assets), Amount	$ 2,047,334	$ 1,633,819
Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio	0.1589	0.1618
Tier 1 Capital Ratio (to risk-weighted assets), Ratio	0.1448	0.1481
CET1 Capital Ratio (to risk-weighted assets), Ratio	11.54%	14.15%
Leverage Ratio (to adjusted average assets), Ratio	0.1016	0.1119
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 1,131,079	$ 882,582
Tier 1 Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	848,309	661,937
CET1 Capital Ratio (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	636,232	496,453
Leverage Ratio (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 806,011	$ 584,274
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	0.0800	0.0800
Tier 1 Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	0.0600	0.0600
CET1 Capital Ratio (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Ratio	4.50%	4.50%
Leverage Ratio (to adjusted average assets), Minimum for Capital Adequacy Purpose, Ratio	0.0400	0.0400
Seacoast National Bank (A Wholly Owned Bank Subsidiary)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-Based Capital Ratio (to risk-weighted assets), Amount	$ 2,128,607	$ 1,685,451
Tier 1 Capital Ratio (to risk-weighted assets), Amount	1,952,001	1,555,986
CET1 Capital Ratio (to risk-weighted assets), Amount	1,951,997	1,555,980
Leverage Ratio (to adjusted average assets), Amount	$ 1,952,001	$ 1,555,986
Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio	0.1507	0.1530
Tier 1 Capital Ratio (to risk-weighted assets), Ratio	0.1382	0.1413
CET1 Capital Ratio (to risk-weighted assets), Ratio	13.82%	14.13%
Leverage Ratio (to adjusted average assets), Ratio	0.0969	0.1066
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 1,129,858	$ 881,106
Tier 1 Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	847,394	660,830
CET1 Capital Ratio (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	635,545	495,622
Leverage Ratio (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 805,419	$ 583,760
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	0.0800	0.0800
Tier 1 Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	0.0600	0.0600
CET1 Capital Ratio (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Ratio	4.50%	4.50%
Leverage Ratio (to adjusted average assets), Minimum for Capital Adequacy Purpose, Ratio	0.0400	0.0400
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,412,323	$ 1,101,383
Tier 1 Capital Ratio (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	1,129,858	881,106
CET1 Capital Ratio (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	918,010	715,899
Leverage Ratio (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 1,006,774	$ 729,699
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.1000	0.1000
Tier 1 Capital Ratio (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.0800	0.0800
CET1 Capital Ratio (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%
Leverage Ratio (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.0500	0.0500

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Common equity capital as defined in the regulations. Also called Core Capital.

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The minimum amount of Tier 1 Risk Based common equity capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum Tier common equity Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Tier 1 Risk Based Common Equity Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The Tier 1 capital ratio (Tier 1 common equity capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

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Common equity tier 1 capital divided by risk weighted assets as defined by regulations.

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Amount of total capital as defined by regulatory framework.

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Amount of minimum total risk-based capital required for capital adequacy as defined by regulatory framework.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
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Amount of Tier 1 leverage capital as defined by regulatory framework.

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