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Commercial Mortgage Loans, Subordinate Loans and Other Lending Assets, Net - CECL Allowance as Percentage of Amortized Cost and Total Commitment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Allowance and Provision for Loan Credit Loss [Abstract]
Beginning balance, specific CECL allowance, funded	$ 26,482	$ 26,482
Write-offs, specific CECL allowance, funded		(127,512)	$ (81,890)
Ending balance, specific CECL allowance, funded		30,836	26,482
Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]
Beginning balance, General CECL allowance, funded	26,482	26,482	26,224
Allowances (Reversals), net		4,354	258
Quarter writeoff, General CECL allowance, funded		0	0
Ending balance, General CECL allowance, funded		30,836	26,482	$ 26,224
Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]
Beginning balance, General CECL allowance, unfunded	4,017	4,017	4,347
Allowances (Reversals), net		1,931	(330)
Quarter writeoff, General CECL allowance, unfunded		0	0
Ending balance, General CECL allowance, unfunded		5,948	4,017	4,347
Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]
General CECL Allowance	30,499	30,499	30,571
Allowances (Reversals), net		6,285	(72)
General CECL Allowance writeoff		0	0
General CECL Allowance		36,784	30,499	30,571
Financing Receivable, Total Allowance for Credit Loss [Roll Forward]
Total CECL Allowance	223,499	223,499	164,071
Allowances (Reversals), net		283,297	141,408
Total CECL Allowance, writeoff		(127,512)	(81,980)
Total CECL Allowance		$ 379,284	$ 223,499	$ 164,071
General CECL allowance, % of amortized cost		0.52%	0.38%	0.36%
Total CECL allowance, % of amortized cost		5.07%	2.61%	1.86%
Commercial Mortgage and Subordinated Portfolio Segment
Allowance and Provision for Loan Credit Loss [Abstract]
Beginning balance, specific CECL allowance, funded	193,000	$ 193,000	$ 133,500
Allowances (Reversals), net	$ 142,000	277,012	141,480
Write-offs, specific CECL allowance, funded		(127,512)	(81,980)	$ (24,900)
Ending balance, specific CECL allowance, funded		$ 342,500	$ 193,000	$ 133,500

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- Definition

Allowance for credit loss as percent of amortized cost.

+ References

No definition available.

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Financing receivable allowance for credit loss expense reversal.

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- Definition

Financing receivable allowance for credit loss funded and unfunded.

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- Definition

Financing receivable allowance for credit loss write off.

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- Definition

Financing receivable current expected credit loss allowance.

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Financing Receivable, Funded, Allowance for Credit Loss

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Financing Receivable, Funded, Allowance for Credit Loss [Roll Forward]

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Financing receivable funded and unfunded credit loss expense reversal.

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Financing receivable funded and unfunded credit loss write off.

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Financing receivable funded credit loss write off

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Financing Receivable, General Allowance, Allowance for Credit Loss [Roll Forward]

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Financing Receivable, Total Allowance for Credit Loss [Roll Forward]

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Financing receivable unfunded allowance for credit loss.

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Financing Receivable, Unfunded, Allowance for Credit Loss [Roll Forward]

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Financing receivable unfunded credit loss expense reversal.

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Financing receivable unfunded credit loss write off.

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General allowance for credit loss as percent of amortized cost.

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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

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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. 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 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. 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 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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