Income Taxes - Summary of Net Deferred Tax Assets (Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Allowance for loan losses	$ 6,926	$ 8,139
Other real estate owned	1,562sbcf_DeferredTaxAssetsDepreciation	899sbcf_DeferredTaxAssetsDepreciation
Section 382 limitation	1,383us-gaap_DeferredTaxAssetsOther	0us-gaap_DeferredTaxAssetsOther
Accrued stock compensation	721	528
Federal tax loss carryforward	38,703	42,776
State tax loss carryforward	7,468	7,925
Alternative minimum tax carryforward	2,136	1,304
Net unrealized securities losses	3,035	6,503
Deferred compensation	1,643	1,169
Accrued interest and fee income	3,270us-gaap_DeferredTaxAssetsDeferredIncome	0us-gaap_DeferredTaxAssetsDeferredIncome
Other	7,428	273
Gross deferred tax assets	74,275us-gaap_DeferredTaxAssetsGross	69,516us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance	0	0
Deferred tax assets net of valuation allowance	74,275us-gaap_DeferredTaxAssetsNet	69,516us-gaap_DeferredTaxAssetsNet
Depreciation	(1,334)sbcf_DeferredTaxLiabilitiesDepreciation	(1,365)sbcf_DeferredTaxLiabilitiesDepreciation
Deposit base intangible	(2,976)	(233)
Accrued interest and fee income	0	(1,060)
Other	(3,165)us-gaap_DeferredTaxLiabilitiesOther	0us-gaap_DeferredTaxLiabilitiesOther
Gross deferred tax liabilities	(7,475)us-gaap_DeferredIncomeTaxLiabilities	(2,658)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets	$ 66,800us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 66,858us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred tax assets depreciation.

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Deferred tax liabilities deposit base intangible.

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Deferred tax liabilities depreciation.

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

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Amount before allocation of valuation allowances of deferred tax asset attributable to other deductible loss carryforwards not separately disclosed.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the provision for loan losses.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses on available-for-sale securities.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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Amount of deferred tax liability attributable to taxable temporary differences from tax deferred revenue or other income not separately disclosed.

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