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Impaired Loans and Allowance for Loan Losses - Additional Information (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Modifications [Line Items]      
Troubled Debt Restructuring Outstanding $ 25,000,000sbcf_TroubledDebtRestructuringOutstanding $ 25,100,000sbcf_TroubledDebtRestructuringOutstanding  
Loans and Leases Receivable, Impaired, Interest Income Recognized, Change in Present Value Attributable to Passage of Time 456,000us-gaap_LoansAndLeasesReceivableImpairedInterestIncomeRecognizedChangeInPresentValueAttributableToPassageOfTime 1,100,000us-gaap_LoansAndLeasesReceivableImpairedInterestIncomeRecognizedChangeInPresentValueAttributableToPassageOfTime 1,000,000us-gaap_LoansAndLeasesReceivableImpairedInterestIncomeRecognizedChangeInPresentValueAttributableToPassageOfTime
Loan Default Period 90 years    
Impaired Financing Receivable, Average Recorded Investment 49,602,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment 66,603,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment 96,439,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Interest income on impaired loans 1,345,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod 1,260,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod 3,054,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Nonaccrual loans and loans past due ninety days 21,140,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 27,672,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus [1] 40,955,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Accrual Loans 17,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing 160,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing 1,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Financing Receivable, Recorded Investment, Nonaccrual Status 21,140,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus 27,672,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus [1] 40,955,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing 17,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing 160,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing 1,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Newly identified TDRs 5,500,000sbcf_NewTroubledDebtRestructuringIdentifiedAmount
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_LoansMember		    
Loans [Member] | The Bank shares [Member]      
Financing Receivable, Modifications [Line Items]      
Assets, Fair Value Adjustment 11,200,000us-gaap_AssetsFairValueAdjustment
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_LoansMember
/ us-gaap_BusinessAcquisitionAxis
= sbcf_BankSharesMember		    
Fair value adjustment Percent 3.56%sbcf_FairValueAdjustmentPercent
/ us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis
= us-gaap_LoansMember
/ us-gaap_BusinessAcquisitionAxis
= sbcf_BankSharesMember		    
Residential Real Estate [Member]      
Financing Receivable, Modifications [Line Items]      
Newly identified TDRs 700,000sbcf_NewTroubledDebtRestructuringIdentifiedAmount
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember		    
Impaired Financing Receivable, Average Recorded Investment 32,159,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember		 37,411,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember		  
Interest income on impaired loans 643,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember		 647,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ResidentialRealEstateMember		  
Commercial Real Estate [Member]      
Financing Receivable, Modifications [Line Items]      
Newly identified TDRs 4,300,000sbcf_NewTroubledDebtRestructuringIdentifiedAmount
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember		    
Impaired Financing Receivable, Average Recorded Investment 13,159,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember		 24,646,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember		  
Interest income on impaired loans 481,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember		 423,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialRealEstateMember		  
Commercial and Financial Loan [Member]      
Financing Receivable, Modifications [Line Items]      
Impaired Financing Receivable, Average Recorded Investment 157,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 20,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Interest income on impaired loans 8,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		 10,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_CommercialPortfolioSegmentMember		  
Consumer [Member]      
Financing Receivable, Modifications [Line Items]      
Impaired Financing Receivable, Average Recorded Investment 834,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		 733,000us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		  
Interest income on impaired loans 26,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		 42,000us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember		  
Construction Loans [Member]      
Financing Receivable, Modifications [Line Items]      
Newly identified TDRs $ 100,000sbcf_NewTroubledDebtRestructuringIdentifiedAmount
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConstructionLoansMember		    
[1] All purchased loans disclosed were acquired in 2014 and were therefore not presented as part of this table.