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BORROWINGS - Narrative (Details)
$ in Millions
12 Months Ended
Jan. 01, 2022
USD ($)
Dec. 31, 2023
USD ($)
fund
Dec. 31, 2022
USD ($)
BORROWINGS      
Number of unsecured federal funds lines of credit | fund   2  
Amount outstanding   $ 0.0 $ 0.0
Repayments of debt $ 6.6    
Redemption percentage 100.00%    
Interest expenses   2.7 1.4
Bank Technology Fund      
BORROWINGS      
Debt securities held to maturity par value pledged as collateral   $ 44.3  
PPPLF      
BORROWINGS      
Interest bearing rate (as a percent)   35.00%  
Face amount   $ 3.5 5.4
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  
Federal Funds Lines of Credit Two      
BORROWINGS      
Maximum borrowing capacity   19.0  
FHLB      
BORROWINGS      
Amount of collateral pledged   1,310.0 $ 1,260.0
Borrowings from FHLB   656.6  
March 27, 2024      
BORROWINGS      
Borrowings from FHLB   $ 31.0  
Interest bearing rate (as a percent)   1000.00%