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PREMISES AND EQUIPMENT (Depreciation and Amortization) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Premises and Equipment      
Depreciation and amortization of premises and equipment $ 6,441 $ 6,049 $ 5,870
Net occupancy      
Premises and Equipment      
Depreciation and amortization of premises and equipment 3,880 4,097 3,997
Equipment      
Premises and Equipment      
Depreciation and amortization of premises and equipment $ 2,561 $ 1,952 $ 1,873