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PREMISES AND EQUIPMENT - Schedule of Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 321,880 $ 328,940  
Less accumulated depreciation and amortization 114,669 114,434  
Total premises and equipment 207,211 214,506  
Operating Leases, Rent Expense 9,100 11,200 $ 9,100
Land and land improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 52,373 54,958  
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 161,371 163,277  
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 70,177 74,881  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 29,525 31,728  
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 8,434 $ 4,096