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Investment Securities - Narrative (Details)
 12 Months Ended
Dec. 31, 2025
USD ($)
security
preferred_interest
shares
Dec. 31, 2024
USD ($)
preferred_interest
security
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2012
shares
Debt Securities, Available-for-sale [Line Items]        
Cost of third party management $ 700,000 $ 800,000 $ 500,000  
Number of securities with unrealized losses | security 14 13    
Allowance for credit loss $ 216,936,000 $ 431,424,000    
Equity security, fair value $ 628,000 $ 5,146,000    
SEREF        
Debt Securities, Available-for-sale [Line Items]        
Number of shares acquired (in shares) | shares       9,140,000
Number of shares redeemed (in shares) | shares 3,944,520 2,767,038 1,892,313  
Proceeds from shares redeemed $ 5,100,000 $ 3,700,000 $ 2,500,000  
Remaining held (in shares) | shares 536,129      
Equity security, fair value $ 600,000 5,100,000    
Ownership percentage 2.30%      
VIE eliminations        
Debt Securities, Available-for-sale [Line Items]        
Fair value of investment securities before consolidation of VIEs eliminated against VIE liabilities $ 32,500,000      
Fair value option        
Debt Securities, Available-for-sale [Line Items]        
Fair value of mortgage backed securities 1,700,000,000      
RMBS        
Debt Securities, Available-for-sale [Line Items]        
Portion of securities with variable rate $ 78,600,000      
RMBS | Available-for-sale        
Debt Securities, Available-for-sale [Line Items]        
Portion of securities with variable rate (as a percent) 89.00%      
RMBS | Fair value option        
Debt Securities, Available-for-sale [Line Items]        
Portion of securities with variable rate $ 0      
Fair value of investment securities before consolidation of VIEs 404,700,000      
Unpaid principal balance of investment securities before consolidation of VIEs 326,300,000      
CMBS        
Debt Securities, Available-for-sale [Line Items]        
Allowance for credit loss 92,629,000 357,012,000    
CMBS | Fair value option        
Debt Securities, Available-for-sale [Line Items]        
Portion of securities with variable rate 0      
Fair value of investment securities before consolidation of VIEs 1,300,000,000      
Unpaid principal balance of investment securities before consolidation of VIEs 2,900,000,000      
Infrastructure bonds        
Debt Securities, Available-for-sale [Line Items]        
Allowance for credit loss 41,463,000 27,343,000    
Infrastructure bonds | Credit deteriorated | Infrastructure loans: | Choctaw, Mississippi        
Debt Securities, Available-for-sale [Line Items]        
Allowance for credit loss to date 10,000,000.0 10,000,000.0    
Allowance for credit loss 19,200,000 19,200,000    
Preferred interests        
Debt Securities, Available-for-sale [Line Items]        
Allowance for credit loss $ 82,844,000 $ 47,069,000    
Preferred interests | Commercial loans:        
Debt Securities, Available-for-sale [Line Items]        
Number of commercial lending preferred interests | preferred_interest 7 5    
Debt securities, held-to-maturity, nonaccrual $ 65,000,000.0 $ 29,300,000    
Unfunded commitments $ 76,400,000 $ 57,300,000