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Regulatory Capital - Summary of Required Regulatory Capital (Details) $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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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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