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BORROWINGS - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
fund
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
BORROWINGS          
Number of unsecured federal funds lines of credit | fund     2    
Interest expenses $ 0.7 $ 0.7 $ 1.4 $ 1.3  
PPPLF          
BORROWINGS          
Interest bearing rate (as a percent) 35.00%   35.00%    
Advances from Federal Home Loan Banks $ 2.8   $ 2.8   $ 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   $ 10.0    
Amount outstanding 0.0   0.0   0.0
Federal Funds Lines of Credit Two          
BORROWINGS          
Maximum borrowing capacity 19.0   19.0    
Bank Technology Fund          
BORROWINGS          
Par value of collateral amount 11.3   11.3    
FHLB          
BORROWINGS          
Amount of collateral pledged 1,310.0   1,310.0   $ 1,310.0
Borrowings from FHLB 551.6   551.6    
March 27, 2024          
BORROWINGS          
Borrowings from FHLB 31.0   31.0    
January 10, 2025          
BORROWINGS          
Borrowings from FHLB $ 10.0   $ 10.0    
Interest bearing rate (as a percent) 0.10%   0.10%    
April 1, 2024          
BORROWINGS          
Borrowings from FHLB $ 50.0   $ 50.0    
April 1, 2024 | Secured Overnight Financing Rate (SOFR)          
BORROWINGS          
Interest bearing rate (as a percent) 0.15%   0.15%