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Borrowings - Narrative (Details) - USD ($)
Jun. 29, 2020
May 06, 2020
Jun. 30, 2020
Mar. 09, 2020
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    
FHLB advances outstanding     $ 0  
FHLB advances        
Short-term Debt [Line Items]        
Loans pledged     11,900,000,000  
Federal Reserve Bank Advances        
Short-term Debt [Line Items]        
Loans pledged     3,800,000,000  
FHLB advances outstanding     $ 0  
London Interbank Offered Rate (LIBOR)        
Short-term Debt [Line Items]        
Basis points   5.09%    
Revolving Credit Facility | Amended TCF Financial Corporation, Line-of-Credit        
Short-term Debt [Line Items]        
Repayment on revolving credit facility $ 80,000,000.0      
Unsecured debt       $ 150,000,000.0
Debt term 364 days