Consolidated Balance Sheets (Parenthetical) Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Pledged MBS of $3,268,796 and $5,024,625, respectively	$ 3,391,112	$ 5,024,625
Preferred Stock, Shares Authorized	50,000,000
Preferred Stock, Shares Outstanding	7,248,330	6,788,330
Preferred Stock, Shares Issued	7,248,330	6,788,330
Preferred Stock, Liquidation Preference, Value	$ 181,208	$ 169,708
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Shares Authorized	90,000,000
Common Stock, Shares, Issued	23,140,617	22,945,993
Common Stock, Shares, Outstanding	23,140,617	22,945,993
Common Stock, Par or Stated Value Per Share	$ 0.01
Mortgage Loans on Real Estate, Commercial and Consumer, Net	$ 7,366	$ 8,857