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Borrowings - Federal Funds Purchased and Securities Sold Under Agreements to Repurchase (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Short-term Debt [Line Items]      
Maximum amount outstanding at any month end $ 298,399us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod $ 165,770us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod $ 149,316us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
Weighted average interest rate at end of year 0.19%us-gaap_ShortTermDebtWeightedAverageInterestRate 0.17%us-gaap_ShortTermDebtWeightedAverageInterestRate 0.21%us-gaap_ShortTermDebtWeightedAverageInterestRate
Average amount outstanding $ 171,965us-gaap_ShorttermDebtAverageOutstandingAmount $ 155,222us-gaap_ShorttermDebtAverageOutstandingAmount $ 141,592us-gaap_ShorttermDebtAverageOutstandingAmount
Weighted average interest rate during the year 0.17%sbcf_ShortTermDebtWeightedAverageInterestRateDuringYear 0.18%sbcf_ShortTermDebtWeightedAverageInterestRateDuringYear 0.24%sbcf_ShortTermDebtWeightedAverageInterestRateDuringYear