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DEBT SECURITIES - Gross unrealized losses aggregated by category (Details)
3 Months Ended
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Marketable Securities [Line Items]    
Securities available for sale, gross unrealized losses, less than twelve months $ 47,000  
Securities available for sale, gross unrealized losses, twelve months and over 66,908,000 $ 62,009,000
Securities available for sale, fair value, less than twelve months 9,249,000  
Securities available for sale, fair value, twelve months and over 275,871,000 285,509,000
Securities held to maturity, gross unrealized losses, less than twelve months 145,000 96,000
Securities held to maturity, gross unrealized losses, twelve months and over 477,000 438,000
Securities held to maturity, fair value, less than twelve months 4,579,000 4,700,000
Securities held to maturity, fair value, twelve months and over $ 14,523,000 14,562,000
Number of debt securities | security 136  
Number of debt securities in unrealized loss position | security 133  
Allowance for credit loss $ 0  
U.S. government and government-sponsored enterprise obligations    
Marketable Securities [Line Items]    
Securities available for sale, gross unrealized losses, twelve months and over 7,127,000 6,961,000
Securities available for sale, fair value, twelve months and over 40,016,000 40,182,000
Securities held to maturity, gross unrealized losses, twelve months and over 477,000 438,000
Securities held to maturity, fair value, twelve months and over 14,523,000 14,562,000
U.S. government agency and government-sponsored residential mortgage-backed securities    
Marketable Securities [Line Items]    
Securities available for sale, gross unrealized losses, less than twelve months 47,000  
Securities available for sale, gross unrealized losses, twelve months and over 59,439,000 54,683,000
Securities available for sale, fair value, less than twelve months 9,249,000  
Securities available for sale, fair value, twelve months and over 231,934,000 240,955,000
U.S. government-sponsored collateralized mortgage obligations    
Marketable Securities [Line Items]    
Securities available for sale, gross unrealized losses, twelve months and over 66,000 70,000
Securities available for sale, fair value, twelve months and over 1,590,000 1,782,000
SBA asset-backed securities    
Marketable Securities [Line Items]    
Securities available for sale, gross unrealized losses, twelve months and over 90,000 107,000
Securities available for sale, fair value, twelve months and over 1,517,000 1,778,000
Securities held to maturity, gross unrealized losses, less than twelve months 145,000 96,000
Securities held to maturity, fair value, less than twelve months 4,579,000 4,700,000
Corporate bonds    
Marketable Securities [Line Items]    
Securities available for sale, gross unrealized losses, twelve months and over 186,000 188,000
Securities available for sale, fair value, twelve months and over $ 814,000 $ 812,000