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INVESTMENT SECURITIES - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]      
Proceeds from sales of available for sale securities $ 0 $ 0  
Federal Reserve Bank      
Debt Securities, Available-for-sale [Line Items]      
Long-term line of credit 0   $ 0
Mortgage-backed securities | MPF Credit Enhancement Fee      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale security, restricted 151   179
Mortgage-backed securities | MPF Credit Enhancement Fee | Federal Home Loan Bank of Des Moines      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale security, restricted 396   415
Mortgage-backed securities | Asset Pledged as Collateral | Federal Reserve Bank      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale security, restricted 28,865   29,191
Mortgage-backed securities | Asset Pledged as Collateral | Specific Municipal Deposits      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale security, restricted 1,863   1,928
U.S. government agency obligations | Asset Pledged as Collateral | Specific Municipal Deposits      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale security, restricted $ 442   $ 516