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Borrowings - Narrative (Details) - USD ($)
Jun. 29, 2020
May 06, 2020
Sep. 30, 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      
Short-term Debt [Line Items]      
Loans pledged     $ 14,000,000,000.0
Federal Reserve Bank Advances      
Short-term Debt [Line Items]      
Loans pledged     2,500,000,000
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