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SHORT-TERM BORROWINGS: (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Short Term Borrowings Disclosure [Abstract]    
Average amount outstanding $ 45,697us-gaap_ShorttermDebtAverageOutstandingAmount $ 37,990us-gaap_ShorttermDebtAverageOutstandingAmount
Maximum amount outstanding at a month end $ 96,452us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount $ 83,452us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
Average interest rate during year (percent) 0.22%us-gaap_ShortTermDebtWeightedAverageInterestRate 0.20%us-gaap_ShortTermDebtWeightedAverageInterestRate
Interest rate at year-end (percent) 0.20%us-gaap_DebtInstrumentInterestRateEffectivePercentage 0.12%us-gaap_DebtInstrumentInterestRateEffectivePercentage