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INVESTMENT SECURITIES - Allowance for credit losses on held to maturity debt securities by major security type (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
Schedule of Held-to-Maturity Securities [Line Items]  
Provision (Credit) $ (77,000)
Ending Balance 37,000
Impact of adopting ASU 2016-13  
Schedule of Held-to-Maturity Securities [Line Items]  
Beginning Balance 114,000
U.S. Agency  
Schedule of Held-to-Maturity Securities [Line Items]  
Ending Balance 0
U.S. Agency mortgage-backed securities  
Schedule of Held-to-Maturity Securities [Line Items]  
Ending Balance 0
Municipal  
Schedule of Held-to-Maturity Securities [Line Items]  
Provision (Credit) (1,000)
Ending Balance 2,000
Municipal | Impact of adopting ASU 2016-13  
Schedule of Held-to-Maturity Securities [Line Items]  
Beginning Balance 3,000
Corporate bonds and other securities  
Schedule of Held-to-Maturity Securities [Line Items]  
Provision (Credit) (76,000)
Ending Balance 35,000
Corporate bonds and other securities | Impact of adopting ASU 2016-13  
Schedule of Held-to-Maturity Securities [Line Items]  
Beginning Balance $ 111,000