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RETIREMENT PLANS: (Details 3)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Principal assumptions used (benefit obligation):    
Discount rate (percent) 4.22% 3.60%
Rate of increase in compensation levels (percent) 3.00% 3.00%
Principal assumptions used (net periodic benefit):    
Discount rate 3.60% 4.14%
Rate of increase in compensation levels 3.00% 3.00%
Expected long-term rate of return on plan assets (percent) 6.00% 6.00%