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SECURITIES AVAILABLE-FOR-SALE (Realized Gain (Loss) on Investments) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Gross Gains And Losses From The Sales And Calls Of Investment Securities [Line Items]      
Gross gains on sales and calls of securities $ 739bsrr_GainOnSalesOfSecuritiesNet $ 6bsrr_GainOnSalesOfSecuritiesNet $ 2,059bsrr_GainOnSalesOfSecuritiesNet
Gross losses on sales and calls of securities (72)bsrr_LossOnSalesOfSecuritiesNet    (297)bsrr_LossOnSalesOfSecuritiesNet
Net gains on sales and calls of securities $ 667us-gaap_GainLossOnSaleOfSecuritiesNet $ 6us-gaap_GainLossOnSaleOfSecuritiesNet $ 1,762us-gaap_GainLossOnSaleOfSecuritiesNet