PREMISES AND EQUIPMENT - Summary 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]
Gross premises and equipment	$ 211,167	$ 216,467
Less: Accumulated depreciation	106,683	100,864
Net premises and equipment	104,484	115,603
Depreciation expense of premises and equipment	17,508	24,152	$ 15,410
Land
Property, Plant and Equipment [Line Items]
Gross premises and equipment	33,919	33,932
Buildings
Property, Plant and Equipment [Line Items]
Gross premises and equipment	49,262	49,406
Leasehold improvements
Property, Plant and Equipment [Line Items]
Gross premises and equipment	70,431	77,845
Furniture and equipment
Property, Plant and Equipment [Line Items]
Gross premises and equipment	57,555	55,284
Land, Buildings, Leasehold Improvements, Furniture and Equipment
Property, Plant and Equipment [Line Items]
Depreciation expense of premises and equipment	$ 17,900	$ 20,900	$ 13,500