Advances - Schedule of Advance Payments by Financial Institution on Foreclosed Properties (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Advances On Behalf of Borrowers [Line Items]
Advances	$ 264,458	$ 272,641
Allowance for losses	(9,925)	(23,259)	$ (16,465)	$ (37,952)
Advances, net	254,533	249,382	$ 211,793	$ 257,882
Principal and interest
Advances On Behalf of Borrowers [Line Items]
Advances	80,229	43,671
Taxes and insurance
Advances On Behalf of Borrowers [Line Items]
Advances	92,315	160,373
Foreclosures, bankruptcy, REO and other
Advances On Behalf of Borrowers [Line Items]
Advances	$ 91,914	$ 68,597