Summary of Significant Accounting Policies (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) item class segment	Dec. 31, 2019 USD ($)
Number of reportable segments | segment	4
Number of days loans must be delinquent to be placed on nonaccrual status	90 days
Cash collateral offset against derivative liability positions	$ 8,800
Number of separate classes of servicing rights used for risk management purposes | class	2
Number of repurchase agreements accounted for as components of linked transactions | item	0
Unrecognized accrued taxes, interest and penalties	$ 0	$ 0
The number of consecutive months contractual payments that must be received on a loan in non-accrual status before resuming recognition of interest income | item	3
Borrowings under credit facilities | Maximum
Maturity period	2 years
Restricted cash
Cash collateral not offset against derivative liability positions	$ 11,500	$ 9,500