Loans Receivable - Schedule of Reserve for Loan Losses (Details) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Reserve for loan losses, January 1, 2020	$ 0
Cumulative-effect of adopting of ASU 2016-13 to beginning retained earnings	1,420
Provision for expected loan losses	7,894
Reserve for loan losses, March 31, 2020	9,314
Secured Mortgage Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Reserve for loan losses, January 1, 2020	0
Cumulative-effect of adopting of ASU 2016-13 to beginning retained earnings	513
Provision for expected loan losses	4,224
Reserve for loan losses, March 31, 2020	4,737
Mezzanine and Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Reserve for loan losses, January 1, 2020	0
Cumulative-effect of adopting of ASU 2016-13 to beginning retained earnings	907
Provision for expected loan losses	3,670
Reserve for loan losses, March 31, 2020	$ 4,577

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The effect of a change in method or methods for calculating the allowance for credit losses on the current period provision.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

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