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Premises Equipment and Software - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]      
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Premises, equipment and software, net Premises, equipment and software, net  
Finance lease, right-of-use asset $ 2.2 $ 3.4  
Depreciation and amortization expense 50.5 51.6 $ 49.2
Premises and equipment transferred to/(from) other assets, net 33.4 $ 7.0  
Real Estate Assets      
Property, Plant and Equipment [Line Items]      
Premises and equipment transferred to/(from) other assets, net $ 17.6