ACCOUNTING POLICIES - PPE (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) branches		Dec. 31, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Intangible Assets, Net (Including Goodwill)	$ 4,000,000		$ 1,900,000
Property, buildings and equipment, net	$ 399,157	[1]	$ 181,448
Number of Locations | branches	800
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	five to forty years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	two to ten years
Software and Software Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	three to seven years
Land, Buildings and Improvements
Property, Plant and Equipment [Line Items]
Property, buildings and equipment, net	$ 144,100

[1] The components of property, buildings and equipment as of December 31, 2020 exclude a total of $0.3 million that is classified as held for sale, as disclosed in Note 7, "Assets and Liabilities Held for Sale".