v3.26.1
Loans - Matured Loans, Principal by LTV and Lien Position (Parenthetical) (Details) - USD ($)
 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jan. 31, 2026
Dec. 31, 2025
Oct. 31, 2025
Aug. 31, 2025
Apr. 30, 2025
Jan. 31, 2025
Dec. 31, 2024
Aug. 31, 2022
Mar. 31, 2020
Oct. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]                        
Secured loans - principal $ 53,317,000     $ 58,163,000                
Matured loans 17,600,000                      
Monthly payments Current 154,000                      
PostMaturityInterest 99,000                      
Secured Loans [Member]                        
Financing Receivable, Credit Quality Indicator [Line Items]                        
Secured loans - principal 53,300,000                      
Palo Alto [Member] | First Lien [Member]                        
Financing Receivable, Credit Quality Indicator [Line Items]                        
Principal Amount Of Loan 4,700,000                      
Loan Balance 4,800,000                      
Loan Collateral Appraised Value 6,200                      
Property taxes owed 228,000                      
San Francisco [Member]                        
Financing Receivable, Credit Quality Indicator [Line Items]                        
Secured loans - principal [1] 7,863,000     7,863,000                
San Francisco [Member] | First Lien [Member]                        
Financing Receivable, Credit Quality Indicator [Line Items]                        
Principal Amount Of Loan 990,000   $ 858,000                  
Loan Balance 1,200                      
Loan Collateral Appraised Value 1,200,000     1,200,000                
Property taxes owed 90,000                      
Livermore [Member] | First Lien [Member]                        
Financing Receivable, Credit Quality Indicator [Line Items]                        
Principal Amount Of Loan         $ 1,200              
Loan Collateral Appraised Value                   $ 1,800    
Napa [Member]                        
Financing Receivable, Credit Quality Indicator [Line Items]                        
Secured loans - principal [1] 632,000     632,000                
Napa [Member] | First Lien [Member]                        
Financing Receivable, Credit Quality Indicator [Line Items]                        
Principal Amount Of Loan                 $ 633,000      
Loan Balance 674,000                      
Loan Collateral Appraised Value       970,000                
Los Angeles [Member]                        
Financing Receivable, Credit Quality Indicator [Line Items]                        
Secured loans - principal 13,441,000     15,448,000                
Los Angeles [Member] | Second liens [Member]                        
Financing Receivable, Credit Quality Indicator [Line Items]                        
Principal Amount Of Loan       1,300,000     $ 600,000          
Loan Collateral Appraised Value           $ 8,100           $ 6,200,000
Senior debt           $ 4,400,000         $ 3,800,000  
San Diego [Member]                        
Financing Receivable, Credit Quality Indicator [Line Items]                        
Secured loans - principal $ 8,139,000     $ 8,141,000                
San Diego [Member] | First Lien [Member]                        
Financing Receivable, Credit Quality Indicator [Line Items]                        
Principal Amount Of Loan   $ 7,400,000                    
Loan Collateral Appraised Value               $ 12,500,000        
[1] Includes Silicon Valley