Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
RMBS, available-for-sale	$ 84,800	$ 88,283
Credit loss allowance	55,258	37,369
HTM debt securities	338,307	216,936
Equity security, fair value		628
Total investment securities	402,829	301,000
VIE eliminations
Debt Securities, Available-for-sale [Line Items]
Equity security	(1,540,884)	(1,657,029)
RMBS
Debt Securities, Available-for-sale [Line Items]
RMBS, available-for-sale	84,800	88,283
CMBS
Debt Securities, Available-for-sale [Line Items]
RMBS, available-for-sale	34,980	32,522
Credit loss allowance	7	13
HTM debt securities	89,441	92,629
Before consolidation of securitization VIEs
Debt Securities, Available-for-sale [Line Items]
HTM debt securities	283,049	179,567
Equity security, fair value	0	628
Total investment securities	1,943,713	1,958,029
Before consolidation of securitization VIEs \| RMBS
Debt Securities, Available-for-sale [Line Items]
RMBS, available-for-sale	84,800	88,283
Equity security	312,961	404,688
Before consolidation of securitization VIEs \| CMBS
Debt Securities, Available-for-sale [Line Items]
Equity security	1,262,903	1,284,863
Marketable securities, Non-controlling interest	$ 144,600	$ 146,500

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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

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