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PREMISES AND EQUIPMENT: (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment, Gross [Abstract]      
Depreciation $ 3,730 $ 3,950 $ 4,340
Rent expense $ 1,000 $ 1,000 $ 900