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Loans and Investments - Summary of Impaired Loans (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($) loan	Dec. 31, 2023 USD ($) loan
Loans and Investments
UPB	$ 507,659	$ 427,929
Carrying Value (1)	483,377	404,896
Allowance for Credit Losses	$ 133,361	$ 120,611
Wtd. Avg. First Dollar LTV Ratio	0	0
Wtd. Avg. Last Dollar LTV Ratio	0.99	0.99
Number of impaired loans (less unearned revenue and other holdbacks and adjustments) by asset class | loan	22	19
Multifamily
Loans and Investments
UPB	$ 352,223	$ 272,493
Carrying Value (1)	338,772	260,291
Allowance for Credit Losses	$ 50,500	$ 37,750
Wtd. Avg. First Dollar LTV Ratio	0	0
Wtd. Avg. Last Dollar LTV Ratio	0.99	1
Land
Loans and Investments
UPB	$ 134,215	$ 134,215
Carrying Value (1)	127,868	127,868
Allowance for Credit Losses	$ 77,869	$ 77,869
Wtd. Avg. First Dollar LTV Ratio	0	0
Wtd. Avg. Last Dollar LTV Ratio	0.99	0.99
Retail
Loans and Investments
UPB	$ 19,521	$ 19,521
Carrying Value (1)	15,037	15,037
Allowance for Credit Losses	$ 3,292	$ 3,292
Wtd. Avg. First Dollar LTV Ratio	0	0
Wtd. Avg. Last Dollar LTV Ratio	0.95	0.88
Commercial
Loans and Investments
UPB	$ 1,700	$ 1,700
Carrying Value (1)	1,700	1,700
Allowance for Credit Losses	$ 1,700	$ 1,700
Wtd. Avg. First Dollar LTV Ratio	0	0
Wtd. Avg. Last Dollar LTV Ratio	1	1

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- Definition

Carrying value of impaired financing receivables.

+ References

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- Definition

For an impaired loan, the weighted average loan to value ratio that is calculated by comparing the total of the carrying value of the company's loan and all senior lien positions within the capital stack to the fair value of the underlying collateral to determine the point at which the company will absorb a total loss of its position.

+ References

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- Definition

For an impaired loan, the weighted average loan to value ratio that is calculated by comparing the total of the carrying value of the company's loan and all senior lien positions within the capital stack to the fair value of the underlying collateral to determine the point at which the company will initially absorb a loss.

+ References

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- Definition

The number of impaired loans (less unearned revenue and other holdbacks and adjustments) by asset class.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 29
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1

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- Definition

Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-19

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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- Definition

Amount at par value of financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-19

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