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COMMERCIAL MORTGAGE LOANS HELD-FOR-INVESTMENT - Additional Information (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
loan
Dec. 31, 2025
USD ($)
loan
Financing Receivable, Credit Quality Indicator [Line Items]    
Average risk rating, moderate 3.1 3.2
Financing receivable, allowance for credit loss, period increase (decrease) $ 3,100,000  
Loans held for investment [1] $ 19,543,903 $ 22,658,121
Minimum    
Financing Receivable, Credit Quality Indicator [Line Items]    
Capitalization rate assumption percentage 5.50%  
Maximum    
Financing Receivable, Credit Quality Indicator [Line Items]    
Capitalization rate assumption percentage 8.50%  
Risk rating, 5    
Financing Receivable, Credit Quality Indicator [Line Items]    
Unpaid principal balance of default risk loans $ 107,900,000  
Amortized cost of default risk loans 90,700,000  
Fair value of default risk loans 91,000,000.0  
Risk rating, 5 | Dallas, TX    
Financing Receivable, Credit Quality Indicator [Line Items]    
Outstanding principal balance 31,900,000  
Principal payment amount $ 2,000,000.0  
Term extention period 2 years  
Risk rating, 5 | Dallas, TX | Minimum    
Financing Receivable, Credit Quality Indicator [Line Items]    
Credit spread percentage 3.40%  
Risk rating, 5 | Dallas, TX | Maximum    
Financing Receivable, Credit Quality Indicator [Line Items]    
Credit spread percentage 3.90%  
Commercial Real Estate Portfolio Segment | Multifamily    
Financing Receivable, Credit Quality Indicator [Line Items]    
Commercial loans, specific allowance $ 15,800,000 17,600,000
Recognized interest on loan $ 500,000 $ 800,000
Commercial Real Estate Portfolio Segment | Risk rating, 3    
Financing Receivable, Credit Quality Indicator [Line Items]    
Average risk rating, percentage 76.70% 81.60%
Commercial loans that paid off $ 46,800,000  
Transition of commercial loans held for sale to a lower risk rating 9,800,000  
Commercial Real Estate Portfolio Segment | Risk rating, 2    
Financing Receivable, Credit Quality Indicator [Line Items]    
Transition of commercial loans held for sale to a lower risk rating 94,500,000  
Commercial Real Estate Portfolio Segment | Risk rating, 4    
Financing Receivable, Credit Quality Indicator [Line Items]    
Transition of commercial loans held for sale to a higher risk rating 69,600,000  
Commercial Real Estate Portfolio Segment | Risk rating, 5    
Financing Receivable, Credit Quality Indicator [Line Items]    
Commercial loans held for sale foreclosed and moved to REO 10,500,000  
Commercial Real Estate Portfolio Segment | Risk rating, 5 | Multifamily    
Financing Receivable, Credit Quality Indicator [Line Items]    
Recognized interest on loan 300,000  
Commercial Real Estate Portfolio Segment | Risk rating, 5 | Multifamily | Philadelphia, PA    
Financing Receivable, Credit Quality Indicator [Line Items]    
Commercial loans, specific allowance $ 1,300,000 $ 1,300,000
Number of loans collateralized | loan 1 1
Number of impaired office loans | loan 2 2
Commercial loans, held-for-investment, unpaid principal value $ 15,500,000 $ 15,500,000
Commercial Real Estate Portfolio Segment | Risk rating, 5 | Multifamily | Arlington, TX    
Financing Receivable, Credit Quality Indicator [Line Items]    
Commercial loans, specific allowance $ 3,600,000 $ 3,600,000
Number of loans collateralized | loan 2 2
Number of impaired office loans | loan 2 2
Commercial Real Estate Portfolio Segment | Risk rating, 5 | Multifamily | Cedar Park, TX    
Financing Receivable, Credit Quality Indicator [Line Items]    
Commercial loans, specific allowance $ 0 $ 0
Commercial loans, held-for-investment, unpaid principal value 35,500,000 35,500,000
Commercial Real Estate Portfolio Segment | Risk Level, Monetary Default Default Risk | Multifamily | Des Moines, IA    
Financing Receivable, Credit Quality Indicator [Line Items]    
Commercial loans, specific allowance $ 500,000 $ 500,000
Number of loans collateralized | loan 4 4
Number of impaired office loans | loan 4 4
Commercial Real Estate Portfolio Segment | Risk Level, Monetary Default Default Risk | Multifamily | Tampa, FL    
Financing Receivable, Credit Quality Indicator [Line Items]    
Commercial loans, specific allowance $ 1,400,000 $ 900,000
Commercial Real Estate Portfolio Segment | Risk Level, Monetary Default Default Risk | Multifamily | Tallahassee, FL    
Financing Receivable, Credit Quality Indicator [Line Items]    
Commercial loans, specific allowance 3,000,000.0 3,000,000.0
Commercial Real Estate Portfolio Segment | Risk Level, Monetary Default Default Risk | Multifamily | Ypsilanti, MI    
Financing Receivable, Credit Quality Indicator [Line Items]    
Commercial loans, specific allowance 5,900,000 5,900,000
Commercial loans, held-for-investment, unpaid principal value 56,900,000 55,800,000
Commercial Real Estate Portfolio Segment | Risk Level, Monetary Default Default Risk | Multifamily | Colorado Springs, CO    
Financing Receivable, Credit Quality Indicator [Line Items]    
Commercial loans, specific allowance 2,400,000 $ 2,400,000
Number of loans collateralized | loan   1
Commercial loans, held-for-investment, unpaid principal value $ 10,500,000 $ 10,500,000
[1] Our consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company was the primary beneficiary of these VIEs. As of March 31, 2026 and December 31, 2025, assets of consolidated VIEs totaled $666,553,315 and $889,507,091, respectively and the liabilities of consolidated VIEs totaled $581,030,250 and $750,274,556 respectively. See Note 4 for further discussion.