PREMISES AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	$ 186,512	$ 179,783
Accumulated depreciation	(92,876)	(89,845)
Premises and equipment, net	93,636	89,938
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	15,714	15,480
Bank Premises [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	95,275	90,899
Equipment and Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Premises and equipment, Gross	$ 75,523	$ 73,404