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Merger - Summary of Ownership (Details) - USD ($)
$ / shares in Units, $ in Thousands
Aug. 01, 2019
Sep. 30, 2019
Jul. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Common stock, shares outstanding (in shares) 153,500,000 153,571,381   88,198,460
Legacy TCF shareholders        
Business Acquisition [Line Items]        
Share price (in usd per share)     $ 21.38  
Legacy TCF        
Business Acquisition [Line Items]        
Common stock, shares outstanding (in shares) 302,065,000      
Percentage Ownership 100.00%      
Legacy TCF | Chemical shareholders        
Business Acquisition [Line Items]        
Common stock, shares outstanding (in shares) 140,836,000      
Percentage Ownership 46.62%      
Legacy TCF | Legacy TCF shareholders        
Business Acquisition [Line Items]        
Common stock, shares outstanding (in shares) 161,229,000      
Percentage Ownership 53.38%      
Chemical Financial Corporation        
Business Acquisition [Line Items]        
Common stock, shares outstanding (in shares) 153,479,000      
Percentage Ownership 100.00%      
Market value $ 6,452,268      
Chemical Financial Corporation | Chemical shareholders        
Business Acquisition [Line Items]        
Common stock, shares outstanding (in shares) 71,559,000      
Percentage Ownership 46.62%      
Market value $ 3,008,330      
Chemical Financial Corporation | Legacy TCF shareholders        
Business Acquisition [Line Items]        
Common stock, shares outstanding (in shares) 81,920,000      
Percentage Ownership 53.38%      
Market value $ 3,443,938      
Common Stock | Chemical Financial Corporation        
Business Acquisition [Line Items]        
Share price (in usd per share) $ 42.04