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Loans and Leases - Narrative (Details) - USD ($)
$ in Millions
Jan. 03, 2022
Jun. 30, 2022
Dec. 31, 2021
Receivables [Abstract]      
Financing receivable, accrued interest receivable   $ 142.0 $ 87.0
Financing receivable, threshold period past due   30 days  
Other real estate owned   $ 45.0 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