BANK PREMISES AND EQUIPMENT, NET (Bank Premises and Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 280,110	$ 282,756
Accumulated depreciation and amortization	(157,094)	(158,428)
Bank premises and equipment, net	123,016	124,328
Land
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	32,117	32,631
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	139,687	134,862
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	90,833	100,688
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	11,547	11,855
Construction in progress
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 5,926	$ 2,720