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Equity - Treasury Stock and Other (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Retained Earnings      
Undistributed earnings of TCF's bank subsidiary $ 134,400,000    
Amount of provision for federal income taxes related to undistributed earnings of TCF's bank subsidiary 0    
Treasury Stock and Other      
Treasury stock, at cost 222,816,000 $ 10,265,000  
Shares held in trust for deferred compensation plans, at cost 29,366,000 30,532,000  
Total 252,182,000 40,797,000  
Repurchases of common stock 212,929,000 $ 9,163,000 $ 0
Aggregate value remaining in the stock repurchase program $ 78,100,000    
Treasury stock reissued (in shares) 16,000 0 0
Treasury stock reissued $ 378,000