Capital and Liquidity Requirements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Percentage of Freddie Mac's liquidity requirement of outstanding principal of TAH loans serviced	8.00%
Other Assets
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Outstanding borrower advances	$ 0.3	$ 0.2
Seller/Servicer Agreements
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Amount of capital in excess of aggregate regulatory requirements	$ 299.9