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TRADING SECURITY (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
TRADING SECURITY.      
Amortized cost $ 12,600,000us-gaap_TradingSecuritiesCost $ 13,100,000us-gaap_TradingSecuritiesCost  
Fair value 14,909,000us-gaap_TradingSecurities 14,840,000us-gaap_TradingSecurities  
Unrealized gains (losses) 600,000us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss (1,500,000)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss (15,000,000)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
Amount of other securities in the trading portfolio $ 0us-gaap_TradingSecuritiesOther $ 0us-gaap_TradingSecuritiesOther