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PREMISES AND EQUIPMENT - Schedule of Premises and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 324,051 $ 314,650  
Less accumulated depreciation and amortization 129,311 125,570  
Total premises and equipment 194,740 189,080  
Depreciation 13,300 12,900 $ 14,100
Land and land improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 48,575 49,016  
Buildings [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 162,423 157,620  
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 72,580 69,855  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross 32,060 32,515  
Construction in progress [Member]      
Property, Plant and Equipment [Line Items]      
Premises and equipment, gross $ 8,413 $ 5,644