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PREMISES AND EQUIPMENT - Schedule of Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 222,550 $ 227,733  
Less accumulated depreciation and amortization 97,514 96,154  
Total premises and equipment 125,036 131,579  
Operating Leases, Rent Expense 7,100 7,900 $ 7,000
Land and land improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 41,711 41,112  
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 104,576 107,918  
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 55,165 55,368  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 19,377 19,544  
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 1,721 $ 3,791