PREMISES AND EQUIPMENT (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Premises and Equipment
Gross premises and equipment	$ 139,398	$ 140,861
Accumulated depreciation and amortization	(91,140)	(91,700)
Net premises and equipment	48,258	49,161
Land
Premises and Equipment
Gross premises and equipment	8,309	9,006
Office buildings and improvements
Premises and Equipment
Gross premises and equipment	96,898	100,892
Furniture, fixtures and equipment
Premises and Equipment
Gross premises and equipment	$ 34,191	$ 30,963