Shareholders' Equity - Summary of Required Regulatory Capital (Details) $ in Thousands	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Parent Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-Based Capital Ratio (to risk-weighted assets), Amount	$ 1,454,168	$ 1,200,885
Tier 1 Capital (to risk-weighted assets), Amount	1,361,832	1,147,306
Common Equity Tier 1 Capital (to risk-weighted assets), Amount	1,277,295	1,075,656
Leverage (to adjusted average assets), Amount	$ 1,361,832	$ 1,147,306
Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio	0.1579	0.1821
Tier 1 Capital (to risk-weighted assets), Ratio	0.1479	0.1740
Common Equity Tier 1 Capital (to risk-weighted assets), Ratio	13.87%	16.31%
Leverage (to adjusted average assets), Ratio	0.1146	0.1168
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 736,709	$ 527,630
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	552,532	395,723
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	414,399	296,792
Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 475,134	$ 392,763
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	$ 1,330,836	$ 1,099,439
Tier 1 Capital (to risk-weighted assets), Amount	1,238,500	1,045,860
Common Equity Tier 1 Capital (to risk-weighted assets), Amount	1,238,496	1,045,856
Leverage (to adjusted average assets), Amount	$ 1,238,500	$ 1,045,860
Total Risk-Based Capital Ratio (to risk-weighted assets), Ratio	0.1447	0.1668
Tier 1 Capital (to risk-weighted assets), Ratio	0.1346	0.1586
Common Equity Tier 1 Capital (to risk-weighted assets), Ratio	13.46%	15.86%
Leverage (to adjusted average assets), Ratio	0.1044	0.1065
Total Risk-Based Capital Ratio (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 735,923	$ 527,055
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	551,942	395,291
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	413,957	296,468
Leverage (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 496,318	$ 392,638
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	$ 919,904	$ 658,819
Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	735,923	527,055
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	597,938	428,232
Leverage (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 620,398	$ 490,798
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

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

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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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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
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Amount of Tier 1 leverage capital as defined by regulatory framework.

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