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SIGNIFICANT ACCOUNTING POLICIES: Benefits and Investment (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Significant Accounting Policies      
Premium paid for split dollar life insurance agreements $ 0tr_PremiumPaidForSplitDollarLifeInsuranceAgreements $ 0tr_PremiumPaidForSplitDollarLifeInsuranceAgreements $ 0tr_PremiumPaidForSplitDollarLifeInsuranceAgreements
Amount received on termination of certain split dollar agreements $ 6,496tr_ProceedsFromTerminationOfSplitDollarLifeInsuranceAgreements $ 26,477tr_ProceedsFromTerminationOfSplitDollarLifeInsuranceAgreements