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Business Combinations - Merger (Details)
Oct. 15, 2020
$ / shares
Jun. 30, 2021
$ / shares
Dec. 31, 2020
$ / shares
Subsequent Event [Line Items]      
Preferred stock, par value (in dollars per share)   $ 0.01 $ 0.01
Class A Common Stock      
Subsequent Event [Line Items]      
Common stock, par value (in dollars per share) $ 1.00 $ 1 $ 1
CIT Group Inc.      
Subsequent Event [Line Items]      
Common stock, par value (in dollars per share) $ 0.01    
CIT Group Inc. | BancShares Class A Common Stock      
Subsequent Event [Line Items]      
Conversion rate 0.06200    
CIT Group Inc. | Fixed-To-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series A      
Subsequent Event [Line Items]      
Preferred stock, par value (in dollars per share) $ 0.01    
CIT Group Inc. | Non-Cumulative Perpetual Preferred Stock, Series B      
Subsequent Event [Line Items]      
Preferred stock, par value (in dollars per share) $ 0.01    
Dividend rate (percentage) 5.625%    
CIT Group Inc. | Series B Preferred Stock      
Subsequent Event [Line Items]      
Conversion rate 1    
CIT Group Inc. | Series C Preferred Stock      
Subsequent Event [Line Items]      
Conversion rate 1