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IMPAIRED LOANS AND ALLOWANCE FOR LOAN LOSSES - Additional Information (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructuring Outstanding $ 23,800,000sbcf_TroubledDebtRestructuringOutstanding   $ 25,000,000sbcf_TroubledDebtRestructuringOutstanding
Loans and Leases Receivable, Impaired, Troubled Debt, Interest Income 243,000us-gaap_LoansAndLeasesReceivableImpairedTroubledDebtInterestIncome 568,000us-gaap_LoansAndLeasesReceivableImpairedTroubledDebtInterestIncome  
Loans and Leases Receivable, Impaired, Interest Income Recognized, Change in Present Value Attributable to Passage of Time 72,000us-gaap_LoansAndLeasesReceivableImpairedInterestIncomeRecognizedChangeInPresentValueAttributableToPassageOfTime 65,000,000us-gaap_LoansAndLeasesReceivableImpairedInterestIncomeRecognizedChangeInPresentValueAttributableToPassageOfTime  
Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Newly identified TDRs 1,000,000sbcf_NewTroubledDebtRestructuringIdentifiedAmount
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_LoansMember
   
Commercial Real Estate [Member]      
Financing Receivable, Modifications [Line Items]      
Newly identified TDRs   $ 400,000sbcf_NewTroubledDebtRestructuringIdentifiedAmount
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember