Loans Receivable - Components (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Receivables [Abstract]
Loans receivable, net of discount	$ 229,961		$ 232,344
Allowance for loan losses	(2,914)	$ (7,900)	0
Loans receivable, net	$ 227,047		$ 232,344

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant