Regulatory Capital - Summary of Required Regulatory Capital (Details) $ in Thousands	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
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	$ 1,785,247	$ 1,713,797
Tier 1 Capital (to risk-weighted assets), Amount	1,633,819	1,565,710
Common Equity Tier 1 Capital (to risk-weighted assets), Amount	1,561,325	1,493,499
Leverage (to adjusted average assets), Amount	$ 1,633,819	$ 1,565,710
Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio	0.1618	0.1592
Tier 1 Capital (to risk-weighted assets), Ratio	0.1481	0.1454
Common Equity Tier 1 Capital (to risk-weighted assets), Ratio	14.15%	13.87%
Leverage (to adjusted average assets), Ratio	0.1119	0.1100
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 882,582	$ 861,355
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	661,937	646,017
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	496,453	484,512
Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 584,274	$ 569,317
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	0.0800	0.0800
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	0.0600	0.0600
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Ratio	4.50%	4.50%
Leverage (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	$ 1,685,451	$ 1,593,431
Tier 1 Capital (to risk-weighted assets), Amount	1,555,986	1,466,878
Common Equity Tier 1 Capital (to risk-weighted assets), Amount	1,555,980	1,466,874
Leverage (to adjusted average assets), Amount	$ 1,555,986	$ 1,466,878
Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio	0.1530	0.1482
Tier 1 Capital (to risk-weighted assets), Ratio	0.1413	0.1364
Common Equity Tier 1 Capital (to risk-weighted assets), Ratio	14.13%	13.64%
Leverage (to adjusted average assets), Ratio	0.1066	0.1032
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 881,106	$ 860,395
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	660,830	645,296
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	495,622	483,972
Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 583,760	$ 568,831
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	0.0800	0.0800
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	0.0600	0.0600
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Ratio	4.50%	4.50%
Leverage (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	$ 1,101,383	$ 1,075,494
Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	881,106	860,395
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	715,899	699,071
Leverage (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 729,699	$ 711,039
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 (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	0.0800	0.0800
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%
Leverage (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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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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Amount of Tier 1 leverage capital as defined by regulatory framework.

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Amount of minimum Tier 1 leverage capital required for capital adequacy as defined by regulatory framework.

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Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Amount of minimum Tier 1 risk-based capital categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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