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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
securitization
Sep. 30, 2024
USD ($)
jointVenture
Sep. 30, 2025
USD ($)
securitization
Sep. 30, 2024
USD ($)
jointVenture
Dec. 31, 2024
USD ($)
securitization
Variable Interest Entity [Line Items]          
Number of securitizations completed | securitization 2   4    
Proceeds from securitizations of loans held-for-investment $ 619,200,000   $ 945,500,000    
Number of securitizations optional redemption right exercised | securitization 2   3    
Proceeds from residential loan securitization redemption (approximately) $ 370,200,000   $ 424,600,000    
Gain (loss) on extinguishment of debt $ (448,000) $ (1,699,000) $ (448,000) $ (2,391,000)  
VIE, Primary Beneficiary | Multifamily          
Variable Interest Entity [Line Items]          
Gain (loss) on extinguishment of debt   $ 100,000      
Number of equity investments sold | jointVenture   4   6  
VIE, Primary Beneficiary | Consolidated SLST          
Variable Interest Entity [Line Items]          
Number of securitization trusts | securitization 3   3   2
VIE, Primary Beneficiary | Consolidated SLST | Level 3          
Variable Interest Entity [Line Items]          
Variable interest entity, primary beneficiary, maximum loss exposure, amount $ 158,800,000   $ 158,800,000   $ 148,500,000
Residential loans held in securitization trusts          
Variable Interest Entity [Line Items]          
Gain (loss) on extinguishment of debt     $ 0