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Merger - Summary of Ownership (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Aug. 01, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jul. 31, 2019
Business Acquisition [Line Items]            
Common stock, shares outstanding (in shares) 153,500,000          
Diluted (in shares)   151,821,592 128,754,588 151,826,928 98,055,279  
Legacy TCF shareholders            
Business Acquisition [Line Items]            
Share price (in usd per share)           $ 21.38
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 | Legacy TCF shareholders            
Business Acquisition [Line Items]            
Common stock, shares outstanding (in shares) 81,920,494          
Percentage Ownership 53.38%          
Market value $ 3,443,938          
Chemical Financial Corporation | Chemical shareholders            
Business Acquisition [Line Items]            
Common stock, shares outstanding (in shares) 71,558,755          
Percentage Ownership 46.62%          
Market value $ 3,008,330          
Legacy TCF            
Business Acquisition [Line Items]            
Common stock, shares outstanding (in shares) 302,065,045          
Percentage Ownership 100.00%          
Legacy TCF | Legacy TCF shareholders            
Business Acquisition [Line Items]            
Common stock, shares outstanding (in shares) 161,229,078          
Percentage Ownership 53.38%          
Legacy TCF | Chemical shareholders            
Business Acquisition [Line Items]            
Common stock, shares outstanding (in shares) 140,835,967          
Percentage Ownership 46.62%          
Common Stock | Chemical Financial Corporation            
Business Acquisition [Line Items]            
Share price (in usd per share) $ 42.04