Amount, after fee received for commitment to originate or purchase, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAfterDeferredIncomeOffset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Summary of Significant Accounting Policies - Mortgage Notes Receivable (Details) - Real Estate Loan - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable	$ 3,600	$ 3,600	$ 3,600
Minimum interest rate			5.00%
LIBOR
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis spread on variable rate			4.00%