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Subsequent Events (Details)
$ / shares in Units, $ in Thousands
Jan. 28, 2019
$ / shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Subsequent Event [Line Items]      
Assets   $ 21,498,341 $ 19,280,873
Subsequent Event      
Subsequent Event [Line Items]      
Share price (in dollars per share) | $ / shares $ 21.58    
Ownership percentage 46.00%    
TCF | Subsequent Event      
Subsequent Event [Line Items]      
Conversion ratio 0.5081    
Ownership percentage 54.00%    
TCF      
Subsequent Event [Line Items]      
Assets   $ 23,700,000  
TCF | Subsequent Event      
Subsequent Event [Line Items]      
Preferred stock, dividend rate 5.70%