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Derivative Instrument and Hedging Activity (Details Textual) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended
Jan. 31, 2007
Mar. 31, 2015
Jan. 04, 2007
Derivative Instrument and Hedging Activity (Textual) [Abstract]      
Interest rate swap agreement period 10 years    
Ten Year Interest Rate Swap      
Derivative Instrument and Hedging Activity (Textual) [Abstract]      
Notional amount     $ 7.7invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sbsa_TenYearInterestRateSwapMember
Fixed interest rate   6.31%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sbsa_TenYearInterestRateSwapMember		  
Basis spread on variable rate of five year interest rate swap   1.25%us-gaap_DerivativeBasisSpreadOnVariableRate
/ us-gaap_DerivativeInstrumentRiskAxis
= sbsa_TenYearInterestRateSwapMember		  
Derivative floating interest rate description   Equal to one-month LIBOR plus 125 basis points  
Interest rate swap expiration date   Jan. 04, 2017