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Investment Securities - Purchases, Sales and Redemptions, and Principal Collections for All Investment Securities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings $ 81,621 $ 88,706 $ 11,578
Sales and redemptions 9,256 3,690 3,042
Principal collections 304,351 274,160 90,348
HTM Securities      
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings 73,308 80,798 11,578
Sales and redemptions 0 0 0
Principal collections 295,408 262,722 80,083
Equity Security      
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings 0 0 0
Sales and redemptions 5,063 3,690 2,493
Principal collections 0 0 0
Securitization VIEs      
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings (164,593) (179,623) (48,011)
Sales and redemptions 0 (12,923) 0
Principal collections (130,571) (58,383) (169,642)
RMBS | Available-for-sale      
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings 0 0 0
Sales and redemptions 0 0 549
Principal collections 8,071 11,253 9,475
RMBS | Fair value option      
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings 0 0 0
Sales and redemptions 0 0 0
Principal collections 39,372 45,182 53,332
CMBS | Fair value option      
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings 172,906 187,531 48,011
Sales and redemptions 4,193 12,923 0
Principal collections 92,071 $ 13,386 $ 117,100
CMBS | Fair value option | Consolidated Partnership      
Debt Securities, Available-for-sale [Line Items]      
Purchases/fundings $ 3,400