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Borrowings - Narrative (Details) - USD ($)
May 01, 2020
Mar. 08, 2020
Mar. 31, 2020
Mar. 09, 2020
Dec. 31, 2019
Short-term Debt [Line Items]          
Short-term borrowings     $ 3,482,535,000   $ 2,669,145,000
FHLB advances outstanding     1,800,000,000    
Revolving Line-of-Credit          
Short-term Debt [Line Items]          
Maximum borrowing capacity   $ 50,000,000.0      
Debt term   364 days      
FHLB advances          
Short-term Debt [Line Items]          
Short-term borrowings     3,200,000,000   2,450,000,000
Loans pledged     11,300,000,000    
Federal Reserve Bank Advances          
Short-term Debt [Line Items]          
Loans pledged     4,000,000,000.0    
FHLB advances outstanding     0    
Amended TCF Financial Corporation, Line-of-Credit | Revolving Line-of-Credit          
Short-term Debt [Line Items]          
Maximum borrowing capacity       $ 150,000,000.0  
TCF Financial Corporation, Line-of-Credit | Line of Credit          
Short-term Debt [Line Items]          
Short-term borrowings     $ 80,000,000   $ 0
Subsequent Event          
Short-term Debt [Line Items]          
Fixed-to-floating rate subordinated notes $ 150,000,000.0        
Interest rate 5.50%        
Debt issuance costs $ 1,600,000        
Subsequent Event | London Interbank Offered Rate (LIBOR)          
Short-term Debt [Line Items]          
Basis points 5.09%