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BORROWINGS - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
fund
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
BORROWINGS      
Number of unsecured federal funds lines of credit | fund 2    
Interest expenses $ 0.7 $ 0.6  
PPPLF      
BORROWINGS      
Interest bearing rate (as a percent) 35.00%    
Advances from Federal Home Loan Banks $ 3.2   $ 3.5
PPPLF | Minimum      
BORROWINGS      
Debt term (in years) 2 years    
PPPLF | Maximum      
BORROWINGS      
Debt term (in years) 5 years    
Federal Funds Lines of Credit One      
BORROWINGS      
Maximum borrowing capacity $ 10.0    
Amount outstanding 0.0   0.0
Federal Funds Lines of Credit Two      
BORROWINGS      
Maximum borrowing capacity 19.0    
Bank Technology Fund      
BORROWINGS      
Par value of collateral amount 10.5    
FHLB      
BORROWINGS      
Amount of collateral pledged 1,340.0   $ 1,310.0
Available balance 722.7    
March 27, 2024      
BORROWINGS      
Borrowings from FHLB 31.0    
January 10, 2025      
BORROWINGS      
Borrowings from FHLB $ 10.0    
Interest bearing rate (as a percent) 0.10%