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Loans and Leases - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Jan. 03, 2022
Dec. 31, 2021
Receivables [Abstract]      
Financing receivable, accrued interest receivable $ 135.0   $ 87.0
Financing receivable, threshold period past due 30 days    
Other real estate owned $ 43.0   40.0
Financing receivable, troubled debt restructuring, commitment to lend 1.0   $ 0.4
CIT Group Inc.      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases   $ 32,714.0  
CIT Group Inc. | Non-PCD      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Purchase accounting adjustment of discount (61.0)    
CIT Group Inc. | Non-PCD | Commercial | Leases      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans and leases $ 29,500.0