Loans - Secured Loans Summarized by Payment Delinquency (Details) $ in Thousands	Sep. 30, 2019 USD ($) MortgageLoan		Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($) MortgageLoan
Past Due
Delinquent loans, number | MortgageLoan	47			56
Loans, Principal | $	$ 86,190	[1]	$ 96,132	$ 97,438
Past Due 30-89 Days [Member]
Past Due
Delinquent loans, number | MortgageLoan				1
Loans, Principal | $				$ 450
Past Due 90-179 Days [Member]
Past Due
Delinquent loans, number | MortgageLoan	3			1
Loans, Principal | $	$ 7,430			$ 3,300
Past Due 180 Days or More [Member]
Past Due
Delinquent loans, number | MortgageLoan	2
Loans, Principal | $	$ 4,016
Past Due [Member]
Past Due
Delinquent loans, number | MortgageLoan	5			2
Loans, Principal | $	$ 11,446			$ 3,750
Current [Member]
Past Due
Delinquent loans, number | MortgageLoan	42			54
Loans, Principal | $	$ 74,744			$ 93,688

[1] Borrower payments are deposited into an independent bank trust account established and administered by RMC, pursuant to California regulations, and are disbursed to the partnership after an appropriate holding period to ensure the funds are collected. Borrower payments deposited into the trust account are not included in the consolidated financial statements until disbursed to the partnership. At September 30, 2019, there was $69,325 in borrower payments held in the RMC trust account, all of which was disbursed to the partnership by October 22, 2019.