Consolidated Balance Sheets (Parenthetical) Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Pledged MBS $5,024,625	$ 5,024,625	$ 3,511,604
Preferred Stock, Shares Authorized	50,000,000
Preferred Stock, Shares Outstanding	6,788,330	5,954,594
Preferred Stock, Shares Issued	6,788,330	5,954,594
Preferred Stock, Liquidation Preference, Value	$ 169,708	$ 148,865
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Shares Authorized	90,000,000
Common Stock, Shares, Issued	22,945,993	20,939,073
Common Stock, Shares, Outstanding	22,945,993	20,939,073
Common Stock, Par or Stated Value Per Share	$ 0.01
Repurchase agreements	$ 4,752,348	$ 3,267,984