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PREMISES AND EQUIPMENT - Schedule of Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 320,902 $ 222,550  
Less accumulated depreciation and amortization 105,250 97,514  
Total premises and equipment 215,652 125,036  
Operating Leases, Rent Expense 9,100 7,100 $ 7,900
Land and land improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 57,701 41,711  
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 161,817 104,576  
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 66,567 55,165  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 29,086 19,377  
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 5,731 $ 1,721