Annual report pursuant to Section 13 and 15(d)

FORECLOSED PROPERTIES (Summary of Foreclosed Properties) (Detail)

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FORECLOSED PROPERTIES (Summary of Foreclosed Properties) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Foreclosed Properties [Line Items]      
Balance at beginning of year $ 12,861sfbs_ForclosedProperties $ 9,685sfbs_ForclosedProperties $ 12,275sfbs_ForclosedProperties
Transfers from loans and capitalized expenses 2,417sfbs_TransfersFromLoansAndCapitalizedExpenses 11,355sfbs_TransfersFromLoansAndCapitalizedExpenses 2,695sfbs_TransfersFromLoansAndCapitalizedExpenses
Foreclosed properties sold (6,539)sfbs_ForeclosedPropertiesSold (7,664)sfbs_ForeclosedPropertiesSold (2,967)sfbs_ForeclosedPropertiesSold
Writedowns and partial liquidations (1,899)sfbs_WritedownsAndPartialLiquidations (515)sfbs_WritedownsAndPartialLiquidations (2,318)sfbs_WritedownsAndPartialLiquidations
Balance at end of year $ 6,840sfbs_ForclosedProperties $ 12,861sfbs_ForclosedProperties $ 9,685sfbs_ForclosedProperties