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Loans Receivable and Allowance for Credit Losses (Composition of Loans Held-for-Investment- Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
loan
Mar. 31, 2021
USD ($)
loan
Dec. 31, 2021
USD ($)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES      
Accrued interest receivable $ 112.2   $ 107.4
Loans receivable pledged to secure borrowings and to provide additional borrowing capacity from the FRB and the FHLB $ 28,360.0   $ 27,670.0
HELOCs      
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES      
Converted to term loan   $ 44.3  
Commercial real estate (“CRE”)      
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES      
Converted to term loan   $ 5.0  
Financing receivable number converted to term loans | loan   2  
HELOC's, Commercial and Industrial ("C&I") and Commercial Real Estate ("CRE")      
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES      
Financing receivable number converted to term loans | loan 0