PREMISES AND EQUIPMENT - Schedule of Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 137,080	$ 117,504
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	60,654	54,531
Net	76,426	62,973
Depreciation expense	7,289	6,410	$ 5,886
Land
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	18,662	15,491
Buildings
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	68,584	58,175
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 49,834	$ 43,838