v3.26.1
Investment Securities - Narrative (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
security
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
security
preferred_interest
shares
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
security
preferred_interest
shares
Dec. 31, 2012
shares
Debt Securities, Available-for-sale [Line Items]            
Cost of third party management $ 200,000 $ 200,000 $ 200,000 $ 400,000    
Number of securities with unrealized losses | security 19   19   14  
Allowance for credit loss $ 338,307,000   $ 338,307,000   $ 216,936,000  
Equity security, fair value         $ 628,000  
SEREF            
Debt Securities, Available-for-sale [Line Items]            
Number of shares acquired (in shares) | shares           9,140,000
Remaining held (in shares) | shares         536,129  
Equity security, fair value         $ 600,000  
Number of shares redeemed (in shares) | shares     536,129      
Proceeds from shares redeemed     $ 600,000      
VIE eliminations            
Debt Securities, Available-for-sale [Line Items]            
Fair value of investment securities before consolidation of VIEs eliminated against VIE liabilities 35,000,000.0   35,000,000.0      
Fair Value Option            
Debt Securities, Available-for-sale [Line Items]            
Fair value of mortgage backed securities 1,600,000,000   1,600,000,000      
RMBS            
Debt Securities, Available-for-sale [Line Items]            
Portion of securities with variable rate $ 75,500,000   $ 75,500,000      
RMBS | Available-for-sale            
Debt Securities, Available-for-sale [Line Items]            
Portion of securities with variable rate (as a percent) 89.00%   89.00%      
RMBS | Fair Value Option            
Debt Securities, Available-for-sale [Line Items]            
Portion of securities with variable rate $ 0   $ 0      
Fair value of investment securities before consolidation of VIEs 313,000,000.0   313,000,000.0      
Unpaid principal balance of investment securities before consolidation of VIEs 238,000,000.0   238,000,000.0      
CMBS            
Debt Securities, Available-for-sale [Line Items]            
Allowance for credit loss 89,441,000   89,441,000   92,629,000  
CMBS | Fair Value Option            
Debt Securities, Available-for-sale [Line Items]            
Portion of securities with variable rate 0   0      
Fair value of investment securities before consolidation of VIEs 1,300,000,000   1,300,000,000      
Unpaid principal balance of investment securities before consolidation of VIEs 2,800,000,000   2,800,000,000      
Infrastructure bonds            
Debt Securities, Available-for-sale [Line Items]            
Allowance for credit loss 134,599,000   134,599,000   41,463,000  
Infrastructure bonds | Choctaw, Mississippi | Infrastructure loans: | Credit deteriorated            
Debt Securities, Available-for-sale [Line Items]            
Allowance for credit loss to date 10,000,000.0   10,000,000.0   10,000,000.0  
Allowance for credit loss 19,200,000   19,200,000   19,200,000  
Preferred interests            
Debt Securities, Available-for-sale [Line Items]            
Allowance for credit loss 114,267,000   $ 114,267,000   $ 82,844,000  
Preferred interests | Commercial loans:            
Debt Securities, Available-for-sale [Line Items]            
Number of commercial lending preferred interests | preferred_interest     7   7  
Debt securities, held-to-maturity, nonaccrual 96,400,000   $ 96,400,000   $ 65,000,000.0  
Unfunded commitments $ 46,000,000.0   $ 46,000,000.0   $ 76,400,000