Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Loans acquired for sale at fair value, pledged to creditors	$ 2,459,483,000	$ 1,621,879,000
Loans at fair value, pledged to creditors	356,337,000	399,266,000
Derivative assets, pledged to creditors	160,156,000	87,976,000
Real estate pledged to creditors	65,008,000	40,198,000
Mortgage servicing rights pledged to creditors	$ 1,105,099,000	$ 1,139,582,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	12,400,000	12,400,000
Preferred stock, shares outstanding	12,400,000	12,400,000
Preferred stock, liquidation preference, value	$ 310,000,000	$ 310,000,000
Common shares, authorized	500,000,000	500,000,000
Common shares, par value	$ 0.01	$ 0.01
Common shares, issued	78,607,436	60,951,444
Common shares, outstanding	78,607,436	60,951,444
Real Estate Acquired in Satisfaction of Debt [Member]
Real estate pledged to creditors	$ 65,008,000	$ 40,198,000
Real Estate Held for Investment [Member]
Real estate pledged to creditors		$ 23,262,000