Loans - Secured Loan Principal Transactions (Parenthetical) (Details)	Dec. 31, 2021 USD ($)
Receivables [Abstract]
Amount Includes Principal Collected and Held in trust	$ 36,000

Amount Includes Principal Collected and Held in Trust.

No definition available.

Name:	ck0001448038_AmountIncludesPrincipalCollectedAndHeldInTrust
Namespace Prefix:	ck0001448038_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant