v3.26.3
MANAGEMENT SERVICES BUSINESS - Investment Securities (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 82 Months Ended
Nov. 26, 2019
Sep. 30, 2026
Sep. 30, 2026
Dec. 31, 2025
Equity Securities, FV-NI        
Investment in Alpine Income Property Trust, Inc.   $ 42,881 $ 42,881 $ 41,324
Alpine Income Property Trust, Inc. Common Stock and Alpine Income Property OP, LP Limited Partnership Units        
Equity Securities, FV-NI        
Investment in Alpine Income Property Trust, Inc. (in shares)   2,470,000 2,470,000  
Investment in Alpine Income Property Trust, Inc.   $ 42,900 $ 42,900  
Investment in Alpine Income Property Trust, Inc., ownership percentage (as a percent)   12.90% 12.90%  
Alpine Income Property OP, LP Limited Partnership Units        
Equity Securities, FV-NI        
Investment in Alpine Income Property Trust, Inc., shares acquired in exchange for properties (in shares) 1,223,854      
Investment in Alpine Income Property Trust, Inc., shares acquired in exchange for properties, value $ 23,300      
Investment in Alpine Income Property Trust, Inc. (in shares)   1,223,854 1,223,854  
Investment in Alpine Income Property Trust, Inc.   $ 21,234 $ 21,234 20,463
Investment in Alpine Income Property Trust, Inc., ownership percentage (as a percent)   6.40% 6.40%  
Common Stock        
Equity Securities, FV-NI        
Investment in Alpine Income Property Trust, Inc., shares purchased, weighted-average price per share (in dollars per share)     $ 16.15  
Investment in Alpine Income Property Trust, Inc., shares purchased, private placement (in shares) 394,737      
Investment in Alpine Income Property Trust, Inc., shares purchased, private placement, value $ 7,500      
Investment in Alpine Income Property Trust, Inc., shares purchased, initial public offering (in shares) 421,053      
Investment in Alpine Income Property Trust, Inc., shares purchased, initial public offering, value $ 8,000      
Investment in Alpine Income Property Trust, Inc., shares purchased (in shares)   0 431,912  
Investment in Alpine Income Property Trust, Inc., shares purchased, value     $ 7,000  
Investment in Alpine Income Property Trust, Inc. (in shares)   1,247,702 1,247,702  
Investment in Alpine Income Property Trust, Inc.   $ 21,647 $ 21,647 $ 20,861
Investment in Alpine Income Property Trust, Inc., ownership percentage (as a percent)   6.50% 6.50%