Shareholders' Equity - Summary of Required Regulatory Capital (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Parent Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital (to risk-weighted assets), Amount	$ 227,310	$ 227,428
Total Capital (to risk-weighted assets), Ratio	16.88%	18.33%
Total Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	107,757	99,247
Total Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	8.00%	8.00%
Tier 1 Capital (to risk-weighted assets), Amount	210,433	211,839
Tier 1 Capital (to risk-weighted assets), Ratio	15.62%	17.08%
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	53,878	49,624
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	4.00%	4.00%
Tier 1 Capital (to adjusted average assets), Amount	210,433	211,839
Tier 1 Capital (to adjusted average assets), Ratio	9.59%	10.04%
Tier 1 Capital (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	92,234	84,377
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	225,102	220,433
Total Capital (to risk-weighted assets), Ratio	16.74%	17.79%
Total Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	107,571	99,116
Total Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	8.00%	8.00%
Total Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	134,463	123,895
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), Amount	208,253	204,864
Tier 1 Capital (to risk-weighted assets), Ratio	15.49%	16.54%
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Amount	53,785	49,558
Tier 1 Capital (to risk-weighted assets), Minimum for Capital Adequacy Purpose, Ratio	4.00%	4.00%
Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	80,678	74,337
Tier 1 Capital (to risk-weighted assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.00%	6.00%
Tier 1 Capital (to adjusted average assets), Amount	208,253	204,864
Tier 1 Capital (to adjusted average assets), Ratio	9.51%	9.72%
Tier 1 Capital (to adjusted average assets), Minimum for Capital Adequacy Purpose, Amount	87,636	84,312
Tier 1 Capital (to adjusted average assets), Minimum for Capital Adequacy Purpose, Ratio	4.00%	4.00%
Tier 1 Capital (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 109,545	$ 105,389
Tier 1 Capital (to adjusted average assets), Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%