CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Cash pledged as collateral	$ 1,625,999	$ 1,581,775
Loans, pledged assets	$ 2,837,690	$ 2,997,051
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	85,150,000	75,950,000
Preferred stock, shares issued (in shares)	81,900,000	73,400,000
Preferred stock, shares outstanding (in shares)	81,900,000	73,400,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	2,914,850,000	1,924,050,000
Common stock, shares issued (in shares)	1,437,964,466	1,313,763,450
Common stock, shares outstanding (in shares)	1,437,964,466	1,313,763,450
Non-Agency Mortgage-backed Securities
Pledged assets	$ 2,788	$ 3,616
Agency mortgage-backed securities, at fair value
Pledged assets	$ 111,087,358	$ 87,193,316