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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
Oct. 27, 2017
Oct. 13, 2017
Sep. 30, 2017
Dec. 31, 2016
Subsequent Event [Line Items]        
Preferred stock, par value (in dollars per share)     $ 0.01 $ 0.01
Subsequent Event | Freddie Mac-Sponsored Multi-family K-Series        
Subsequent Event [Line Items]        
Purchase of first loss tranche securities $ 36.7      
Collateral, multi-family loans $ 1,300.0      
Subsequent Event | Series D Preferred Stock        
Subsequent Event [Line Items]        
Preferred stock, cumulative redeemable dividend rate   8.00%    
Preferred stock, par value (in dollars per share)   $ 0.01    
Subsequent Event | LIBOR | Series D Preferred Stock        
Subsequent Event [Line Items]        
Interest rate, basis spread   5.695%    
Subsequent Event | Underwritten Public Offering | Series D Preferred Stock        
Subsequent Event [Line Items]        
Number of shares sold (in shares)   5,400,000    
Preferred stock, cumulative redeemable dividend rate   8.00%    
Preferred stock, liquidation preference per share (in dollars per share)   $ 25.00    
Redemption price (in dollars per share)   $ 2.00    
Proceeds from issuance of preferred stock   $ 130.4    
Subsequent Event | Underwriter's Option to Purchase Additional Shares | Series D Preferred Stock        
Subsequent Event [Line Items]        
Number of shares sold (in shares)   400,000    
Option to purchase additional shares (in shares)   750,000