Aggregate junior subordinated debentures.

No definition available.

Name:	sbcf_AggregateJuniorSubordinatedDebentures
Namespace Prefix:	sbcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

It represents the amount of early redemption cost for Federal Home Loan Bank advances.

+ References

No definition available.

+ Details

Name:	sbcf_EarlyRedemptionCostForFederalHomeLoanBankAdvances
Namespace Prefix:	sbcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Issuance of common equity securities by trust.

+ References

No definition available.

+ Details

Name:	sbcf_IssuanceOfCommonEquitySecuritiesByTrust
Namespace Prefix:	sbcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Issuance of floating rate preferred securities under private sale.

+ References

No definition available.

+ Details

Name:	sbcf_IssuanceOfFloatingRatePreferredSecuritiesUnderPrivateSale
Namespace Prefix:	sbcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Issuance of junior subordinated debentures.

+ References

No definition available.

+ Details

Name:	sbcf_IssuanceOfJuniorSubordinatedDebentures
Namespace Prefix:	sbcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Proceeds from junior subordinated deferrable interest notes.

+ References

No definition available.

+ Details

Name:	sbcf_ProceedsFromJuniorSubordinatedDeferrableInterestNotes
Namespace Prefix:	sbcf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

+ Details

Name:	us-gaap_AdvancesFromFederalHomeLoanBanks
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of liabilities assumed at the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472

+ Details

Name:	us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611

+ Details

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The calculated weighted average interest rate for Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(3)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The calculated weighted average interest rate for Federal Home Loan Bank advances for the period ended as of the Balance Sheet date.

+ References

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesActivityForYearAverageInterestRateForYear
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of repayments and penalties incurred in the satisfaction or roll-over of Federal Home Loan Bank (FHLB) advance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

Name:	us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresRepaymentAndPenalties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of cash inflow from proceeds of Federal Home Loan Bank (FHLBank) advances.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromFederalHomeLoanBankAdvances
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date which accrues interest at a set, unchanging rate.

+ References

No definition available.

+ Details

Name:	us-gaap_ShortTermDebtPercentageBearingFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	sbcf_DebtInstrumentMaturityPeriodAxis=sbcf_DebtInstrumentMaturityPeriodOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sbcf_DebtInstrumentMaturityPeriodAxis=sbcf_DebtInstrumentMaturityPeriodTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sbcf_DebtInstrumentMaturityPeriodAxis=sbcf_DebtInstrumentMaturityPeriodThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	sbcf_DebtInstrumentMaturityPeriodAxis=sbcf_DebtInstrumentMaturityPeriodFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_FederalHomeLoanBankAdvancesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=sbcf_SBCFStatutoryTrustsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=sbcf_SecuredLinesOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=sbcf_TrustFirstAndSecondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=sbcf_TrustOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=sbcf_TrustSecondMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=sbcf_TrustThirdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sbcf_BankSharesIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=sbcf_FirstGreenBancorpInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_FederalHomeLoanBankBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Borrowings - Additional Information (Details) - USD ($) $ in Thousands								12 Months Ended
	Apr. 07, 2016	Jul. 17, 2015	Nov. 27, 2007	Sep. 15, 2007	Jun. 29, 2007	Dec. 16, 2005	Mar. 31, 2005	Dec. 31, 2018	Dec. 31, 2015	Oct. 19, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Junior subordinated deferrable interest notes issued					$ 12,400
Junior subordinated debentures private sales					12,000
Debt Instrument Maturity Period One
Debt Instrument [Line Items]
Debt outstanding									$ 5,200
Debt maturity date									Dec. 26, 2032
Basis spread on variable rate								6.07%
Debt Instrument Maturity Period Two
Debt Instrument [Line Items]
Debt outstanding									$ 4,100
Debt maturity date									Mar. 17, 2034
Basis spread on variable rate								5.58%
Debt Instrument Maturity Period Three
Debt Instrument [Line Items]
Debt outstanding									$ 5,200
Debt maturity date									Feb. 23, 2036
Interest rate for period								4.04%
Fair value of debt									$ 3,500
Debt Instrument Maturity Period Four
Debt Instrument [Line Items]
Debt outstanding												$ 7,200
Debt maturity date		Dec. 30, 2034
Fair value of debt		$ 2,100
Interest rate on junior subordinated loans								4.38%
LIBOR \| Debt Instrument Maturity Period One
Debt Instrument [Line Items]
Basis spread on variable rate								32.50%
LIBOR \| Debt Instrument Maturity Period Two
Debt Instrument [Line Items]
Basis spread on variable rate								27.90%
LIBOR \| Debt Instrument Maturity Period Three
Debt Instrument [Line Items]
Basis spread on variable rate								13.90%
LIBOR \| Debt Instrument Maturity Period Four
Debt Instrument [Line Items]
Basis spread on variable rate								19.80%
Federal Home Loan Bank
Debt Instrument [Line Items]
Advances received			$ 25,000	$ 25,000
Fixed rate interest rate on advances			2.70%	3.64%
SBCF Statutory Trusts
Debt Instrument [Line Items]
Contractual term							30 years
Secured Lines of Credit
Debt Instrument [Line Items]
Advances from Federal Home Loan Banks								$ 380,000
Weighted average interest rate on Federal Home Loan Bank advances at end of year								2.45%
Weighted average interest rate on Federal Home Loan Bank advances during the year								1.99%
Early redemption costs	$ 1,800
Prepayment on Federal Home Loan Bank advances	$ 50,000
Trust I & II
Debt Instrument [Line Items]
Junior subordinated debentures							$ 20,600
Aggregate subordinated debentures						$ 41,200
Junior subordinated deferrable interest notes issued						41,200
Trust I
Debt Instrument [Line Items]
Junior subordinated debentures								$ 20,000
Interest rate								4.55%
Common equity securities							$ 619,000
Trust I \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate								17.50%
Trust II
Debt Instrument [Line Items]
Junior subordinated debentures											$ 20,000
Interest rate								4.12%
Common equity securities						$ 619,000
Trust II \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate								13.30%
Trust III
Debt Instrument [Line Items]
Interest rate								4.14%
Common equity securities					$ 372,000
Trust III \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate								13.50%
The Bank Shares Inc
Debt Instrument [Line Items]
Secured lines of credit								$ 1,800,000
Advances from Federal Home Loan Banks								$ 317,000
First Green Bancorp, Inc.
Debt Instrument [Line Items]
Federal Home Loan Bank advances										$ 703,307
First Green Bancorp, Inc. \| Federal Home Loan Bank Borrowings
Debt Instrument [Line Items]
Federal Home Loan Bank advances										$ 77,000