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Certain Relationships and Related Transactions - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Related Party Transaction [Line Items]      
Loans and leases $ 70,781,000,000 $ 32,372,000,000 $ 32,792,000,000
Related Persons      
Related Party Transaction [Line Items]      
Credit card lines of credit excluded from loans outstanding, threshold 15,000    
Overdraft lines of credit excluded from loans outstanding, threshold 5,000    
Unfunded Loan Commitment | Related Persons      
Related Party Transaction [Line Items]      
Loans and leases 2,600,000 $ 2,700,000  
CIT Northbridge Credit LLC      
Related Party Transaction [Line Items]      
Income from equity method investments $ 4,000,000    
CIT Group Inc. | CIT Northbridge Credit LLC      
Related Party Transaction [Line Items]      
Equity method investment, ownership percentage 20.00%    
Equity method investments $ 43,000,000    
Allstate Insurance Company and Subsidiary | CIT Northbridge Credit LLC      
Related Party Transaction [Line Items]      
Noncontrolling interest, ownership percentage by parent 80.00%