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Merger - Summary of Consideration (Details) - USD ($)
$ / shares in Units, $ in Thousands
Aug. 01, 2019
Jul. 31, 2019
Business Acquisition [Line Items]    
Cash in lieu of fractional shares $ 148  
Purchase price consideration 3,018,556  
Legacy TCF shareholders    
Business Acquisition [Line Items]    
Number of hypothetical Legacy TCF shares issued to Chemical shareholders (in shares)   140,835,967
Legacy TCF market price per share as of July 31, 2019 (in usd per share)   $ 21.38
Chemical Financial Corporation stock option holders    
Business Acquisition [Line Items]    
Value of Chemical stock options hypothetically converted to options to acquire shares of Legacy TCF common stock 7,335  
Chemical Financial Corporation    
Business Acquisition [Line Items]    
Purchase price determination of hypothetical Legacy TCF shares issued to Chemical shareholders $ 3,011,073