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PREMISES AND EQUIPMENT - Schedule of Premises and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 313,921 $ 321,880  
Less accumulated depreciation and amortization 120,881 114,669  
Total premises and equipment 193,040 207,211  
Depreciation 14,100 15,400 $ 16,100
Land and land improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 49,402 52,373  
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 155,337 161,371  
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 70,847 70,177  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 30,190 29,525  
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 8,145 $ 8,434