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INVESTMENT SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]          
Proceeds from sales of available for sale securities $ 0 $ 0 $ 5,105 $ 0  
Debt securities, available-for-sale, unrealized gain 0   12    
Debt securities, available-for-sale, unrealized loss 0   0    
Federal Reserve Bank          
Debt Securities, Available-for-sale [Line Items]          
Borrowings outstanding under line of credit facility 0   0   $ 0
Mortgage-backed securities | MPF Credit Enhancement Fee          
Debt Securities, Available-for-sale [Line Items]          
Securities pledged as collateral 688   688   142
Mortgage-backed securities | Asset Pledged as Collateral | Federal Reserve Bank          
Debt Securities, Available-for-sale [Line Items]          
Securities pledged as collateral 29,542   29,542   5,421
Mortgage-backed securities | Asset Pledged as Collateral | Specific Municipal Deposits          
Debt Securities, Available-for-sale [Line Items]          
Securities pledged as collateral 1,900   1,900   2,219
U.S. government agency obligations | Asset Pledged as Collateral | Specific Municipal Deposits          
Debt Securities, Available-for-sale [Line Items]          
Securities pledged as collateral $ 531   $ 531   $ 2,602