Shareholders' Equity - Summary of Required Regulatory Capital (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to risk-weighted assets), Amount	$ 383,039	$ 322,765
Total Capital (to risk-weighted assets), Ratio	16.01%	16.25%
Total Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 191,413	$ 158,903
Total Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	8.00%	8.00%
Tier 1 Capital (to risk-weighted assets), Amount	$ 363,873	$ 305,665
Tier 1 Capital (to risk-weighted assets), Ratio	15.21%	15.39%
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 143,560	$ 79,452
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	6.00%	4.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Amount	$ 317,004
Common Equity Tier 1 Capital (to risk-weighted assets), Ratio	13.25%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	$ 107,670
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Ratio	4.50%
Trust preferred securities issued	$ 363,873	$ 305,665
Tier 1 Capital (to adjusted average assets), Ratio	10.70%	10.32%
Tier 1 Capital (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 136,009	$ 124,731
Tier 1 Capital (to adjusted average assets), Minimum for Capital Adequacy Purpose, Ratio	4.00%	4.00%
Seacoast National Bank (A Wholly Owned Bank Subsidiary) [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to risk-weighted assets), Amount	$ 337,259	$ 284,555
Total Capital (to risk-weighted assets), Ratio	14.11%	14.32%
Total Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 191,240	$ 158,925
Total Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	8.00%	8.00%
Tier 1 Capital (to risk-weighted assets), Amount	$ 318,093	$ 267,455
Tier 1 Capital (to risk-weighted assets), Ratio	13.31%	13.46%
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	$ 143,430	$ 79,462
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	6.00%	4.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Amount	$ 318,093
Common Equity Tier 1 Capital (to risk-weighted assets), Ratio	13.31%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Amount	$ 107,572
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum for Capital, Adequacy Purpose, Ratio	4.50%
Trust preferred securities issued	$ 318,093	$ 267,455
Tier 1 Capital (to adjusted average assets), Ratio	9.36%	9.04%
Tier 1 Capital (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	$ 135,929	$ 118,409
Tier 1 Capital (to adjusted average assets), Minimum for Capital Adequacy Purpose, Ratio	4.00%	4.00%
Total Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 239,050	$ 198,656
Total Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 191,240	$ 119,193
Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	6.00%
Tier 1 Capital (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 169,911	$ 148,011
Tier 1 Capital (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 155,382
Common Equity Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%

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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The amount of total capital as defined in the regulations.

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The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum Total risk based capital ratio (total 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 Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital divided by average assets as defined in the regulations.

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Tier 1 Risk Based Capital as defined in the regulations.

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The minimum Tier One 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 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 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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Tier 1 capital divided by risk weighted assets as defined by regulations.

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