CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Cash pledged as collateral	$ 1,137,809	$ 1,648,545
Loans, pledged assets	$ 2,231,035	$ 3,240,583
Preferred Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (in shares)	85,150,000	85,150,000
Preferred Stock, shares issued (in shares)	63,500,000	81,900,000
Preferred Stock, shares outstanding (in shares)	63,500,000	81,900,000
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	2,914,850,000	2,914,850,000
Common Stock, shares issued (in shares)	1,398,240,618	1,430,106,199
Common Stock, shares outstanding (in shares)	1,398,240,618	1,430,106,199
Non-Agency Mortgage-backed Securities
Pledged assets	$ 5,541	$ 3,336
Agency Mortgage-Backed Securities
Pledged assets	$ 67,471,074	$ 108,809,569