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Premises and Equipment - Schedule of Premises and Equipment (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 63.4 $ 70.9
Less accumulated depreciation and amortization (50.3) (50.7)
Premises and equipment, net 13.1 20.2
Computer Hardware    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 22.6 25.6
Operating Lease ROU Assets    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 17.2 21.0
Leasehold Improvements    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 6.1 5.3
Computer Software    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross 15.0 15.7
Furniture and Fixtures    
Property, Plant and Equipment [Line Items]    
Premises and equipment, gross $ 2.5 $ 3.3