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Business Combinations - Summary of Ownership (Details) - USD ($)
$ / shares in Units, $ in Thousands
Aug. 01, 2019
Jul. 31, 2019
Business Acquisition [Line Items]    
Common stock, shares outstanding (in shares) 153,500,000  
Chemical Financial Corporation    
Business Acquisition [Line Items]    
Common stock, shares outstanding (in shares) 153,479,249  
Percentage Ownership 100.00%  
Market value $ 6,452,268  
Chemical Financial Corporation | Common Stock    
Business Acquisition [Line Items]    
Share price (in usd per share) $ 42.04  
Legacy TCF    
Business Acquisition [Line Items]    
Common stock, shares outstanding (in shares) 302,065,045  
Percentage Ownership 100.00%  
Chemical shareholders | Chemical Financial Corporation    
Business Acquisition [Line Items]    
Common stock, shares outstanding (in shares) 71,558,755  
Percentage Ownership 46.62%  
Market value $ 3,008,330  
Chemical shareholders | Legacy TCF    
Business Acquisition [Line Items]    
Common stock, shares outstanding (in shares) 140,835,967  
Percentage Ownership 46.62%  
Legacy TCF shareholders    
Business Acquisition [Line Items]    
Share price (in usd per share)   $ 21.38
Legacy TCF shareholders | Chemical Financial Corporation    
Business Acquisition [Line Items]    
Common stock, shares outstanding (in shares) 81,920,494  
Percentage Ownership 53.38%  
Market value $ 3,443,938  
Legacy TCF shareholders | Legacy TCF    
Business Acquisition [Line Items]    
Common stock, shares outstanding (in shares) 161,229,078  
Percentage Ownership 53.38%