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LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
borrower
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Financing Receivable, Allowance for Credit Losses      
Average loans $ 210,361,000 $ 188,627,000  
Net charge-offs to average loans (annualized) 0.05% 0.13%  
Number of borrowers | borrower 15    
Outstanding commitments $ 37,500,000 $ 31,600,000  
Increase (Decrease) in outstanding commitments 5,900,000    
Term Loans by Origination Year      
Year 2 158,000    
Year 3     $ 13,000
Year 4 24,000   299,000
Year 5 22,000   51,000
Prior 68,000   21,000
Total 272,000   384,000
Unfunded commitments      
Beginning balance 584,000 473,000 473,000
Reduction of unfunded reserve (369,000) (157,000)  
Provisions charged to operations   281,000  
Ending balance 215,000 $ 597,000 584,000
Commercial and Industrial Loans | Commercial and industrial      
Term Loans by Origination Year      
Year 4     299,000
Total     299,000
Consumer Loans      
Term Loans by Origination Year      
Year 2 158,000    
Year 3     13,000
Year 4 24,000    
Year 5 22,000   51,000
Prior 68,000   21,000
Total 272,000   85,000
Consumer Loans | Consumer      
Term Loans by Origination Year      
Year 2 23,000    
Year 3     13,000
Prior     5,000
Total 23,000   18,000
Consumer Loans | Automobile      
Term Loans by Origination Year      
Year 2 135,000    
Year 4 24,000    
Year 5 22,000   51,000
Prior 68,000   16,000
Total $ 249,000   $ 67,000