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SECURITIES - Additional Information (Details) (USD $)
 1 Months Ended 3 Months Ended
May 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]        
Proceeds from Sale of Available-for-sale Securities, Debt   $ 0us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt $ 4,061,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt  
Available-for-sale Securities, Gross Realized Gains     17,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains  
Collateral Underlying Mortgage Investments Terms   30- and 15-year fixed and 10/1 adjustable rate mortgage    
Federal Home Loan Bank Stock and Federal Reserve Bank Stock   15,100,000us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock    
Cost Method Investments, Fair Value Disclosure   15,100,000us-gaap_CostMethodInvestmentsFairValueDisclosure    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   462,805,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue   527,782,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Accumulated unrealized losses   (6,514,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss   (10,026,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Securities Available For Sale Transferred To Held-To-Maturity 158,800,000sbcf_SecuritiesAvailableForSaleTransferredToHeldtomaturity      
Available For Sale Securities Transferred To Held To Maturity Securities Unrealized Gain Loss 3,100,000sbcf_AvailableForSaleSecuritiesTransferredToHeldToMaturitySecuritiesUnrealizedGainLoss      
Mortgage-backed Securities, Issued by Private Enterprises [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   61,484,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		   71,645,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Accumulated unrealized losses   (1,091,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember		   (1,071,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Mortgage Backed Securities And Collateralized Mortgage Obligations Of Us Government Sponsored Entities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   257,600,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= sbcf_MortgageBackedSecuritiesAndCollateralizedMortgageObligationsOfUsGovernmentSponsoredEntitiesMember		    
Accumulated unrealized losses   3,900,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= sbcf_MortgageBackedSecuritiesAndCollateralizedMortgageObligationsOfUsGovernmentSponsoredEntitiesMember		    
Mortgage Backed Securities And Collateralized Mortgage Obligations Of Us Government Sponsored Entities [Member] | Carrying Amount [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Securities pledged as collateral   206,170,000us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_DebtSecurityAxis
= sbcf_MortgageBackedSecuritiesAndCollateralizedMortgageObligationsOfUsGovernmentSponsoredEntitiesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Mortgage Backed Securities And Collateralized Mortgage Obligations Of Us Government Sponsored Entities [Member] | Fair Value [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Securities pledged as collateral   206,996,000us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_DebtSecurityAxis
= sbcf_MortgageBackedSecuritiesAndCollateralizedMortgageObligationsOfUsGovernmentSponsoredEntitiesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		    
Collateralized Mortgage Backed Securities [Member] | Carrying Amount [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Securities pledged as collateral   131,753,000us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		    
Collateralized Mortgage Backed Securities [Member] | Fair Value [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Securities pledged as collateral   131,769,000us-gaap_SecurityOwnedAndPledgedAsCollateralFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_MortgageBackedSecuritiesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember		    
Collateralized Loan Obligations [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   127,622,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedLoanObligationsMember		   125,225,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedLoanObligationsMember
Accumulated unrealized losses   (1,292,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedLoanObligationsMember		   (2,172,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= us-gaap_CollateralizedLoanObligationsMember
Private Collateralized Securities [Member]        
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   75,800,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_DebtSecurityAxis
= sbcf_PrivateCollateralizedSecuritiesMember		    
Accumulated unrealized losses   $ 1,300,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_DebtSecurityAxis
= sbcf_PrivateCollateralizedSecuritiesMember